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8bitworkshop/lib/fatfs.js

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x86: started using v86, freedos, fatfs, yasm, SmallerC
2020-06-14 01:28:58 +00:00
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.fatfs = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
(function (setImmediate){
var _ = require("./helpers.js");
exports.wrapDriver = function (volume, opts) {
opts = _.extend({
maxSectors: 2048
}, opts);
var cache = {},
advice = 'NORMAL',
secSize = volume.sectorSize;
function _freezeBuffer(b) {
var f = _.allocBuffer(b.length);
b.copy(f);
return f;
}
function addToCache(i, data) {
if (advice === 'SEQUENTIAL' || advice === 'NOREUSE') return;
data = _freezeBuffer(data);
cache[i] = data;
//if (data.length > secSize) addToCache(i+1, data.slice(secSize));
while (data.length > secSize) {
data = data.slice(secSize);
cache[++i] = data;
}
// simple highest-sectors-lose eviction policy for now
Object.keys(cache).sort().slice(opts.maxSectors).forEach(function (x) {
delete cache[x];
});
_.log(_.log.DBG, "Cache now contains:", Object.keys(cache).join(','));
}
return {
sectorSize: volume.sectorSize,
numSectors: volume.numSectors,
advice: function (val) {
if (!arguments.length) return advice;
else advice = val;
if (advice === 'SEQUENTIAL' || advice === 'NOREUSE') cache = {};
return this;
},
readSectors: function (i, dest, cb) {
// TODO: handle having partial parts of dest!
if (i in cache && dest.length === secSize) {
cache[i].copy(dest);
setImmediate(cb);
} else volume.readSectors(i, dest, function (e) {
if (e) cb(e);
else addToCache(i, dest), cb();
});
},
writeSectors: (!volume.writeSectors) ? null : function (i, data, cb) {
volume.writeSectors(i, data, function (e) {
if (e) cb(e);
else addToCache(i, data), cb();
});
}
};
};
}).call(this,require("timers").setImmediate)
},{"./helpers.js":4,"timers":35}],2:[function(require,module,exports){
var S = require("./structs.js"),
_ = require("./helpers.js");
function _baseChain(vol) {
var chain = {};
chain.sectorSize = vol._sectorSize;
function posFromOffset(off) {
var secSize = chain.sectorSize,
offset = off % secSize,
sector = (off - offset) / secSize;
return {sector:sector, offset:offset};
}
var sectorCache = vol._makeCache();
Object.defineProperty(chain, 'cacheAdvice', {
enumerable: true,
get: function () { return sectorCache.advice(); },
set: function (v) { sectorCache.advice(v); }
});
chain._vol_readSectors = vol._readSectors.bind(vol, sectorCache);
chain._vol_writeSectors = vol._writeSectors.bind(vol, sectorCache);
// cb(error, bytesRead, buffer)
chain.readFromPosition = function (targetPos, buffer, cb) {
if (typeof targetPos === 'number') targetPos = posFromOffset(targetPos);
if (typeof buffer === 'number') buffer = _.allocBuffer(buffer);
/* NOTE: to keep our contract with the volume driver, we need to read on _full_ sector boundaries!
So we divide the read into [up to] three parts: {preface, main, trailer}
This is kind of unfortunate, but in practice should often still be reasonably efficient. */
if (targetPos.offset) chain.readSectors(targetPos.sector, _.allocBuffer(chain.sectorSize), function (e,d) {
if (e || !d) cb(e, 0, buffer);
else { // copy preface into `buffer`
var dBeg = targetPos.offset,
dEnd = dBeg + buffer.length;
d.copy(buffer, 0, dBeg, dEnd);
if (dEnd > d.length) readMain();
else cb(null, buffer.length, buffer);
}
}); else readMain();
function readMain() {
var prefaceLen = targetPos.offset && (chain.sectorSize - targetPos.offset),
trailerLen = (buffer.length - prefaceLen) % chain.sectorSize,
mainSector = (prefaceLen) ? targetPos.sector + 1 : targetPos.sector,
mainBuffer = (trailerLen) ? buffer.slice(prefaceLen, -trailerLen) : buffer.slice(prefaceLen);
if (mainBuffer.length) chain.readSectors(mainSector, mainBuffer, function (e,d) {
if (e || !d) cb(e, prefaceLen, buffer);
else if (!trailerLen) cb(null, buffer.length, buffer);
else readTrailer();
}); else readTrailer();
function readTrailer() {
var trailerSector = mainSector + (mainBuffer.length / chain.sectorSize);
chain.readSectors(trailerSector, _.allocBuffer(chain.sectorSize), function (e,d) {
if (e || !d) cb(e, buffer.length-trailerLen, buffer);
else {
d.copy(buffer, buffer.length-trailerLen, 0, trailerLen);
cb(null, buffer.length, buffer);
}
});
}
}
};
// cb(error)
chain.writeToPosition = function (targetPos, data, cb) {
_.log(_.log.DBG, "WRITING", data.length, "bytes at", targetPos, "in", this.toJSON(), data);
if (typeof targetPos === 'number') targetPos = posFromOffset(targetPos);
var prefaceBuffer = (targetPos.offset) ? data.slice(0, chain.sectorSize-targetPos.offset) : null;
if (prefaceBuffer) _modifySector(targetPos.sector, targetPos.offset, prefaceBuffer, function (e) {
if (e) cb(e);
else if (prefaceBuffer.length < data.length) writeMain();
else cb();
}); else writeMain();
function writeMain() {
var prefaceLen = (prefaceBuffer) ? prefaceBuffer.length : 0,
trailerLen = (data.length - prefaceLen) % chain.sectorSize,
mainSector = (prefaceLen) ? targetPos.sector + 1 : targetPos.sector,
mainBuffer = (trailerLen) ? data.slice(prefaceLen, -trailerLen) : data.slice(prefaceLen);
if (mainBuffer.length) chain.writeSectors(mainSector, mainBuffer, function (e) {
if (e) cb(e);
else if (!trailerLen) cb();
else writeTrailer();
}); else writeTrailer();
function writeTrailer() {
var trailerSector = mainSector + (mainBuffer.length / chain.sectorSize),
trailerBuffer = data.slice(data.length-trailerLen); // WORKAROUND: https://github.com/tessel/runtime/issues/721
_modifySector(trailerSector, 0, trailerBuffer, cb);
}
}
function _modifySector(sec, off, data, cb) {
chain.readSectors(sec, _.allocBuffer(chain.sectorSize), function (e, orig) {
if (e) return cb(e);
orig || (orig = _.allocBuffer(chain.sectorSize, 0));
//data.copy(orig, off);
orig.set(data, off); //SEH
chain.writeSectors(sec, orig, cb);
});
}
};
return chain;
};
exports.clusterChain = function (vol, firstCluster, _parent) {
var chain = _baseChain(vol),
cache = [firstCluster];
chain.firstCluster = firstCluster;
function _cacheIsComplete() {
return cache[cache.length-1] === 'eof';
}
function extendCacheToInclude(i, cb) { // NOTE: may `cb()` before returning!
if (i < cache.length) cb(null, cache[i]);
else if (_cacheIsComplete()) cb(null, 'eof');
else vol.fetchFromFAT(cache[cache.length-1], function (e,d) {
if (e) cb(e);
else if (typeof d === 'string' && d !== 'eof') cb(S.err.IO());
else {
cache.push(d);
extendCacheToInclude(i, cb);
}
});
}
function expandChainToLength(clusterCount, cb) {
if (!_cacheIsComplete()) throw Error("Must be called only when cache is complete!");
else cache.pop(); // remove 'eof' entry until finished
function addCluster(clustersNeeded, lastCluster) {
if (!clustersNeeded) cache.push('eof'), cb();
else vol.allocateInFAT(lastCluster, function (e, newCluster) {
if (e) cb(e);
else vol.storeToFAT(lastCluster, newCluster, function (e) {
if (e) return cb(e);
cache.push(newCluster);
addCluster(clustersNeeded-1, newCluster);
});
});
}
addCluster(clusterCount - cache.length, cache[cache.length - 1]);
}
function shrinkChainToLength(clusterCount, cb) {
if (!_cacheIsComplete()) throw Error("Must be called only when cache is complete!");
else cache.pop(); // remove 'eof' entry until finished
function removeClusters(count, cb) {
if (!count) cache.push('eof'), cb();
else vol.storeToFAT(cache.pop(), 'free', function (e) {
if (e) cb(e);
else removeClusters(count - 1, cb);
});
}
// NOTE: for now, we don't remove the firstCluster ourselves; we should though!
if (clusterCount) removeClusters(cache.length - clusterCount, cb);
else removeClusters(cache.length - 1, cb);
}
// [{firstSector,numSectors},{firstSector,numSectors},…]
function determineSectorGroups(sectorIdx, numSectors, alloc, cb) {
var sectorOffset = sectorIdx % vol._sectorsPerCluster,
clusterIdx = (sectorIdx - sectorOffset) / vol._sectorsPerCluster,
numClusters = Math.ceil((numSectors + sectorOffset) / vol._sectorsPerCluster),
chainLength = clusterIdx + numClusters;
extendCacheToInclude(chainLength-1, function (e,c) {
if (e) cb(e);
else if (c === 'eof' && alloc) expandChainToLength(chainLength, function (e) {
if (e) cb(e);
else _determineSectorGroups();
});
else _determineSectorGroups();
});
function _determineSectorGroups() {
// …now we have a complete cache
var groups = [],
_group = null;
for (var i = clusterIdx; i < chainLength; ++i) {
var c = (i < cache.length) ? cache[i] : 'eof';
if (c === 'eof') break;
else if (_group && c !== _group._nextCluster) {
groups.push(_group);
_group = null;
}
if (!_group) _group = {
_nextCluster: c+1,
firstSector: vol._firstSectorOfCluster(c) + sectorOffset,
numSectors: vol._sectorsPerCluster - sectorOffset
}; else {
_group._nextCluster += 1;
_group.numSectors += vol._sectorsPerCluster;
}
sectorOffset = 0; // only first group is offset
}
if (_group) groups.push(_group);
cb(null, groups, i === chainLength);
}
}
chain.readSectors = function (i, dest, cb) {
var groupOffset = 0, groupsPending;
determineSectorGroups(i, dest.length / chain.sectorSize, false, function (e, groups, complete) {
if (e) cb(e);
else if (!complete) groupsPending = -1, _pastEOF(cb);
else if ((groupsPending = groups.length)) groups.forEach(function (group) {
var groupLength = group.numSectors * chain.sectorSize,
groupBuffer = dest.slice(groupOffset, groupOffset += groupLength);
chain._vol_readSectors(group.firstSector, groupBuffer, function (e,d) {
if (e && groupsPending !== -1) groupsPending = -1, cb(e);
else if (--groupsPending === 0) cb(null, dest);
});
});
else cb(null, dest); // 0-length destination case
});
};
// TODO: does this handle NOSPC condition?
chain.writeSectors = function (i, data, cb) {
var groupOffset = 0, groupsPending;
determineSectorGroups(i, data.length / chain.sectorSize, true, function (e, groups) {
if (e) cb(e);
else if ((groupsPending = groups.length)) groups.forEach(function (group) {
var groupLength = group.numSectors * chain.sectorSize,
groupBuffer = data.slice(groupOffset, groupOffset += groupLength);
chain._vol_writeSectors(group.firstSector, groupBuffer, function (e) {
if (e && groupsPending !== -1) groupsPending = -1, cb(e);
else if (--groupsPending === 0) cb();
});
});
else cb(); // 0-length data case
});
};
chain.truncate = function (numSectors, cb) {
extendCacheToInclude(Infinity, function (e,c) {
if (e) return cb(e);
var currentLength = cache.length-1,
clustersNeeded = Math.ceil(numSectors / vol._sectorsPerCluster);
if (clustersNeeded < currentLength) shrinkChainToLength(clustersNeeded, cb);
else if (clustersNeeded > currentLength) expandChainToLength(clustersNeeded, cb);
else cb();
});
};
chain.toJSON = function () {
return {firstCluster:firstCluster};
};
return chain;
};
exports.sectorChain = function (vol, firstSector, numSectors) {
var chain = _baseChain(vol);
chain.firstSector = firstSector;
chain.numSectors = numSectors;
chain.readSectors = function (i, dest, cb) {
if (i < numSectors) chain._vol_readSectors(firstSector+i, dest, cb);
else _pastEOF(cb);
};
chain.writeSectors = function (i, data, cb) {
if (i < numSectors) chain._vol_writeSectors(firstSector+i, data, cb);
else _.delayedCall(cb, S.err.NOSPC());
};
chain.truncate = function (i, cb) {
_.delayedCall(cb, S.err.INVAL());
};
chain.toJSON = function () {
return {firstSector:firstSector, numSectors:numSectors};
};
return chain;
};
// NOTE: used with mixed feelings, broken out to mark uses
function _pastEOF(cb) { _.delayedCall(cb, null, null); }
},{"./helpers.js":4,"./structs.js":38}],3:[function(require,module,exports){
var S = require("./structs.js"),
_ = require("./helpers.js");
var dir = exports;
dir.iterator = function (dirChain, opts) {
opts || (opts = {});
var cache = {buffer:null, n: null};
function getSectorBuffer(n, cb) {
if (cache.n === n) cb(null, cache.buffer);
else cache.n = cache.buffer = null, dirChain.readSectors(n, _.allocBuffer(dirChain.sectorSize), function (e,d) {
if (e) cb(e);
else if (!d) return cb(null, null);
else {
cache.n = n;
cache.buffer = d;
getSectorBuffer(n, cb);
}
});
}
var secIdx = 0,
off = {bytes:0},
long = null;
function getNextEntry(cb) {
if (off.bytes >= dirChain.sectorSize) {
secIdx += 1;
off.bytes -= dirChain.sectorSize;
}
var entryPos = {chain:dirChain, sector:secIdx, offset:off.bytes};
getSectorBuffer(secIdx, function (e, buf) {
if (e) return cb(S.err.IO());
else if (!buf) return cb(null, null, entryPos);
var entryIdx = off.bytes,
signalByte = buf[entryIdx];
if (signalByte === S.entryDoneFlag) return cb(null, null, entryPos);
else if (signalByte === S.entryFreeFlag) {
off.bytes += S.dirEntry.size;
long = null;
if (opts.includeFree) return cb(null, {_free:true,_pos:entryPos}, entryPos);
else return getNextEntry(cb); // usually just skip these
}
var attrByte = buf[entryIdx+S.dirEntry.fields.Attr.offset],
entryType = (attrByte === S.longDirFlag) ? S.longDirEntry : S.dirEntry_simple;
var entry = entryType.valueFromBytes(buf, off);
entry._pos = entryPos;
_.log(_.log.DBG, "entry:", entry, secIdx, entryIdx);
if (entryType === S.longDirEntry) {
var firstEntry;
if (entry.Ord & S.lastLongFlag) {
firstEntry = true;
entry.Ord &= ~S.lastLongFlag;
long = {
name: -1,
sum: entry.Chksum,
_rem: entry.Ord-1,
_arr: []
}
}
if (firstEntry || long && entry.Chksum === long.sum && entry.Ord === long._rem--) {
var S_lde_f = S.longDirEntry.fields,
namepart = entry.Name1;
if (entry.Name1.length === S_lde_f.Name1.size/2) {
namepart += entry.Name2;
if (entry.Name2.length === S_lde_f.Name2.size/2) {
namepart += entry.Name3;
}
}
long._arr.push(namepart);
if (!long._rem) {
long.name = long._arr.reverse().join('');
delete long._arr;
delete long._rem;
}
} else long = null;
} else if ((attrByte & 0x08) === 0) { // NOTE: checks `!entry.Attr.volume_id`
var bestName = null;
if (long && long.name) {
var pos = entryIdx + S.dirEntry.fields['Name'].offset,
sum = _.checksumName(buf, pos);
if (sum === long.sum) bestName = long.name;
}
if (!bestName) {
if (signalByte === S.entryIsE5Flag) entry.Name.filename = '\u00E5'+entry.Name.filename.slice(1);
var nam = entry.Name.filename.replace(/ +$/, ''),
ext = entry.Name.extension.replace(/ +$/, '');
// TODO: lowercase bits http://en.wikipedia.org/wiki/8.3_filename#Compatibility
// via NTRes, bits 0x08 and 0x10 http://www.fdos.org/kernel/fatplus.txt.1
bestName = (ext) ? nam+'.'+ext : nam;
}
entry._name = bestName;
// OPTIMIZATION: avoid processing any fields for non-matching entries
// TODO: we could make this automatic via getters, but…?
var _entryBuffer = buf.slice(off.bytes-S.dirEntry.size, off.bytes);
entry._full = function () {
var _entry = S.dirEntry.valueFromBytes(_entryBuffer);
_.extend(entry, _entry);
entry._size = entry.FileSize;
entry._firstCluster = (entry.FstClusHI << 16) + entry.FstClusLO;
return entry;
};
long = null;
return cb(null, entry, entryPos);
} else long = null;
getNextEntry(cb);
});
}
function iter(cb) {
getNextEntry(cb);
return iter; // TODO: previous value can't be re-used, so why make caller re-assign?
}
return iter;
};
function _updateEntry(vol, entry, newStats) {
if ('size' in newStats) entry._size = entry.FileSize = newStats.size;
if ('_touch' in newStats) newStats.archive = newStats.atime = newStats.mtime = true;
if ('archive' in newStats) entry.Attr.archive = true; // TODO: also via newStats.mode?
var _now;
function applyDate(d, prefix, timeToo, tenthToo) {
if (d === true) d = _now || (_now = new Date());
entry[prefix+'Date'] = {year:d.getFullYear()-1980, month:d.getMonth()+1, day:d.getDate()};
if (timeToo) {
entry[prefix+'Time'] = {hours:d.getHours(), minutes:d.getMinutes(), seconds_2:d.getSeconds()>>>1};
if (tenthToo) {
var msec = (d.getSeconds() % 2)*1000 + d.getMilliseconds();
entry[prefix+'TimeTenth'] = Math.floor(msec / 100);
}
}
}
if ('ctime' in newStats) applyDate(newStats.ctime, 'Crt', true, true);
if ('mtime' in newStats) applyDate(newStats.mtime, 'Wrt', true);
if ('atime' in newStats) applyDate(newStats.atime, 'LstAcc');
if ('mode' in newStats) {
entry.Attr.directory = (newStats.mode & S._I.FDIR) ? true : false;
entry.Attr.volume_id = (newStats.mode & S._I.FREG) ? false : true;
if (vol.opts.modmode === 0111) {
entry.Attr.archive = (newStats.mode & S._I.XUSR) ? true : false;
entry.Attr.system = (newStats.mode & S._I.XGRP) ? true : false;
entry.Attr.hidden = (newStats.mode & S._I.XOTH) ? true : false;
entry.Attr.readonly = (newStats.mode & S._I.WUSR) ? false : true;
} else if (vol.opts.modmode === 07000) {
entry.Attr.archive = (newStats.mode & S._I.SVTX) ? true : false;
entry.Attr.system = (newStats.mode & S._I.SGID) ? true : false;
entry.Attr.hidden = (newStats.mode & S._I.SUID) ? true : false;
entry.Attr.readonly = (
newStats.mode & S._I.WUSR ||
newStats.mode & S._I.WGRP ||
newStats.mode & S._I.WOTH
) ? false : true;
}
}
if ('firstCluster' in newStats) {
entry.FstClusLO = newStats.firstCluster & 0xFFFF;
entry.FstClusHI = newStats.firstCluster >>> 16;
entry._firstCluster = newStats.firstCluster;
}
return entry;
}
dir.makeStat = function (vol, entry) {
var stats = {}; // TODO: return an actual `instanceof fs.Stat` somehow?
stats.isFile = function () {
return (!entry.Attr.volume_id && !entry.Attr.directory);
};
stats.isDirectory = function () {
return entry.Attr.directory;
};
stats.isBlockDevice = function () { return false; }
stats.isCharacterDevice = function () { return false; }
stats.isSymbolicLink = function () { return false; }
stats.isFIFO = function () { return false; }
stats.isSocket = function () { return false; }
stats.size = entry.FileSize;
stats.blksize = vol._sectorsPerCluster*vol._sectorSize;
stats.blocks = Math.ceil(stats.size / stats.blksize) || 1;
stats.nlink = 1;
stats.mode = S._I.RUSR | S._I.RGRP | S._I.ROTH;
if (!entry.Attr.readonly) stats.mode |= S._I.WUSR | S._I.WGRP | S._I.WOTH;
if (entry.Attr.directory) stats.mode |= S._I.FDIR;
else if (!entry.Attr.volume_id) stats.mode |= S._I.FREG;
// NOTE: discussion at https://github.com/natevw/fatfs/issues/7
if (vol.opts.modmode === 0111) {
// expose using executable bits, like Samba
if (entry.Attr.archive) stats.mode |= S._I.XUSR;
if (entry.Attr.system) stats.mode |= S._I.XGRP;
if (entry.Attr.hidden) stats.mode |= S._I.XOTH;
} else if (vol.opts.modmode === 07000) {
// expose using setXid/sticky bits, like MKS
if (entry.Attr.archive) stats.mode |= S._I.SVTX;
if (entry.Attr.system) stats.mode |= S._I.SGID;
if (entry.Attr.hidden) stats.mode |= S._I.SUID;
}
stats.mode &= ~vol.opts.umask;
stats.uid = vol.opts.uid;
stats.gid = vol.opts.gid;
function extractDate(prefix) {
var date = entry[prefix+'Date'],
time = entry[prefix+'Time'] || {hours:0, minutes:0, seconds_2:0},
secs = time.seconds_2 * 2,
sect = entry[prefix+'TimeTenth'] || 0;
if (sect > 100) {
secs += 1;
sect -= 100;
}
return new Date(date.year+1980, date.month-1, date.day, time.hours, time.minutes, secs, sect*100);
}
stats.atime = extractDate('LstAcc');
stats.mtime = extractDate('Wrt');
stats.ctime = extractDate('Crt');
entry = { // keep immutable copy (with only the fields we need)
Attr: _.extend({},entry.Attr),
};
return stats;
};
dir.init = function (vol, dirInfo, cb) {
var dirChain = dirInfo.chain,
isRootDir = ('numSectors' in dirChain), // HACK: all others would be a clusterChain
initialCluster = _.allocBuffer(dirChain.sectorSize*vol._sectorsPerCluster),
entriesOffset = {bytes:0};
initialCluster.fill(0);
function writeEntry(name, clusterNum) {
while (name.length < 8) name += " ";
S.dirEntry.bytesFromValue(_updateEntry(vol, {
Name: {filename:name, extension:" "},
Attr: {directory:true}
}, {firstCluster:clusterNum, _touch:true,ctime:true}), initialCluster, entriesOffset);
}
if (!isRootDir) {
writeEntry(".", dirChain.firstCluster);
writeEntry("..", dirInfo.parent.chain.firstCluster);
};
dirChain.writeToPosition(0, initialCluster, cb);
};
dir.addFile = function (vol, dirChain, entryInfo, opts, cb) {
if (typeof opts === 'function') {
cb = opts;
opts = {};
}
var name = entryInfo.name,
entries = [], mainEntry;
entries.push(mainEntry = {
Name: _.shortname(name),
Attr: {directory:opts.dir||false},
_name: name
});
if (1 || mainEntry.Name._lossy) { // HACK: always write long names until `._lossy` is more useful!
var workaroundTessel427 = ('\uFFFF'.length !== 1);
if (workaroundTessel427) throw Error("Your JS runtime does not have proper Unicode string support. (If Tessel, is your firmware up-to-date?)");
// name entries should be 0x0000-terminated and 0xFFFF-filled
var S_lde_f = S.longDirEntry.fields,
ENTRY_CHUNK_LEN = (S_lde_f.Name1.size + S_lde_f.Name2.size + S_lde_f.Name3.size)/2,
partialLen = name.length % ENTRY_CHUNK_LEN,
paddingNeeded = partialLen && (ENTRY_CHUNK_LEN - partialLen);
if (paddingNeeded--) name += '\u0000';
while (paddingNeeded-- > 0) name += '\uFFFF';
// now fill in as many entries as it takes
var off = 0,
ord = 1;
while (off < name.length) entries.push({
Ord: ord++,
Name1: name.slice(off, off+=S_lde_f.Name1.size/2),
Attr_raw: S.longDirFlag,
Chksum: null,
Name2: name.slice(off, off+=S_lde_f.Name2.size/2),
Name3: name.slice(off, off+=S_lde_f.Name3.size/2)
});
entries[entries.length - 1].Ord |= S.lastLongFlag;
}
if (entryInfo.tail) {
var name = mainEntry.Name.filename,
suffix = '~'+entryInfo.tail,
endIdx = name.indexOf(' '),
sufIdx = (~endIdx) ? Math.min(endIdx, name.length-suffix.length) : name.length-suffix.length;
if (sufIdx < 0) return cb(S.err.NAMETOOLONG()); // TODO: would EXIST be more correct?
mainEntry.Name.filename = name.slice(0,sufIdx)+suffix+name.slice(sufIdx+suffix.length);
_.log(_.log.DBG, "Shortname amended to:", mainEntry.Name);
}
vol.allocateInFAT(dirChain.firstCluster || 2, function (e,fileCluster) {
if (e) return cb(e);
var nameBuf = S.dirEntry.fields['Name'].bytesFromValue(mainEntry.Name),
nameSum = _.checksumName(nameBuf);
// TODO: finalize initial properties… (via `opts.mode` instead?)
_updateEntry(vol, mainEntry, {firstCluster:fileCluster, size:0, ctime:true,_touch:true});
mainEntry._pos = _.adjustedPos(vol, entryInfo.target, S.dirEntry.size*(entries.length-1));
entries.slice(1).forEach(function (entry) {
entry.Chksum = nameSum;
});
entries.reverse();
if (entryInfo.lastEntry) entries.push({});
var entriesData = _.allocBuffer(S.dirEntry.size*entries.length),
dataOffset = {bytes:0};
entries.forEach(function (entry) {
var entryType = ('Ord' in entry) ? S.longDirEntry : S.dirEntry;
entryType.bytesFromValue(entry, entriesData, dataOffset);
});
_.log(_.log.DBG, "Writing", entriesData.length, "byte directory entry", mainEntry, "into", dirChain.toJSON(), "at", entryInfo.target);
dirChain.writeToPosition(entryInfo.target, entriesData, function (e) {
// TODO: if we get error, what/should we clean up?
if (e) cb(e);
else cb(null, mainEntry, vol.chainForCluster(fileCluster, dirChain));
});
});
};
dir.findInDirectory = function (vol, dirChain, name, opts, cb) {
var matchName = name.toUpperCase(),
tailName = (opts.prepareForCreate) ? _.shortname(name) : null,
maxTail = 0;
function processNext(next) {
next = next(function (e, d, entryPos) {
if (e) cb(e);
else if (!d) cb(S.err.NOENT(), {tail:maxTail, target:entryPos, lastEntry:true});
else if (d._free) processNext(next); // TODO: look for long enough reusable run
else if (d._name.toUpperCase() === matchName) return cb(null, d._full());
else if (!opts.prepareForCreate) processNext(next);
else {
var dNum = 1,
dName = d.Name.filename,
dTail = dName.match(/(.*)~(\d+)/);
if (dTail) {
dNum = +dTail[2];
dName = dTail[1];
}
if (tailName.extension === d.Name.extension &&
tailName.filename.indexOf(dName) === 0)
{
maxTail = Math.max(dNum+1, maxTail);
}
processNext(next);
}
});
}
processNext(dir.iterator(dirChain, {includeFree:(0 && opts.prepareForCreate)}));
};
dir.updateEntry = function (vol, entry, newStats, cb) {
if (!entry._pos || !entry._pos.chain) throw Error("Entry source unknown!");
var entryPos = entry._pos,
newEntry = _updateEntry(vol, entry, newStats),
data = S.dirEntry.bytesFromValue(newEntry);
_.log(_.log.DBG, "UPDATING ENTRY", newStats, newEntry, entryPos, data);
// TODO: if write fails, then entry becomes corrupt!
entryPos.chain.writeToPosition(entryPos, data, cb);
};
},{"./helpers.js":4,"./structs.js":38}],4:[function(require,module,exports){
(function (Buffer,setImmediate){
var S = require("./structs.js"),
_xok = require('xok');
// ponyfills for older node.js
exports.allocBuffer = Buffer.alloc || function (len, val) {
var b = Buffer(len);
if (arguments.length > 1) b.fill(val);
return b;
};
exports.bufferFrom = Buffer.from || function (arg0, arg1) {
return (arguments.length > 1) ? Buffer(arg0, arg1) : Buffer(arg0);
};
// flag for WORKAROUND: https://github.com/tessel/beta/issues/380
exports.workaroundTessel380 = !Buffer.from && function () {
var b = Buffer([0]),
s = b.slice(0);
return ((s[0] = 0xFF) !== b[0]);
}();
// WORKAROUND: https://github.com/tessel/beta/issues/433
var oldslice;
if (!Buffer.alloc && Buffer(5).slice(10).length < 0) oldslice = Buffer.prototype.slice, Buffer.prototype.slice = function (s, e) {
if (s > this.length) s = this.length;
// ~WORKAROUND: https://github.com/tessel/beta/issues/434
return (arguments.length > 1) ? oldslice.call(this, s, e) : oldslice.call(this, s);
}
exports.absoluteSteps = function (path) {
var steps = [];
path.split('/').forEach(function (str) {
// NOTE: these should actually be fine, just wasteful…
if (str === '..') steps.pop();
else if (str && str !== '.') steps.push(str);
});
return steps.map(exports.longname);
};
exports.absolutePath = function (path) {
return '/'+exports.absoluteSteps(path).join('/');
};
exports.parseFlags = function (flags) {
// read, write, append, create, truncate, exclusive
var info, _dir; // NOTE: there might be more clever ways to "parse", but…
if (flags[0] === '\\') {
// internal flag used internally to `fs.open` directories without `S.err.ISDIR()`
flags = flags.slice(1);
_dir = true;
}
switch (flags) {
case 'r': info = {read:true, write:false, create:false}; break;
case 'r+': info = {read:true, write:true, create:false}; break;
case 'rs': info = {read:true, write:false, create:false, sync:true}; break;
case 'rs+': info = {read:true, write:true, create:false, sync:true}; break;
case 'w': info = {read:false, write:true, create:true, truncate:true}; break;
case 'wx': info = {read:false, write:true, create:true, exclusive:true}; break;
case 'w+': info = {read:true, write:true, create:true, truncate:true}; break;
case 'wx+': info = {read:true, write:true, create:true, exclusive:true}; break;
case 'a': info = {read:false, write:true, create:true, append:true}; break;
case 'ax': info = {read:false, write:true, create:true, append:true, exclusive:true}; break;
case 'a+': info = {read:true, write:true, create:true, append:true}; break;
case 'ax+': info = {read:true, write:true, create:true, append:true, exclusive:true}; break;
default: throw Error("Uknown mode: "+flags); // TODO: throw as `S.err.INVAL`
}
if (info.sync) throw Error("Mode not implemented."); // TODO: what would this require of us?
if (_dir) info._openDir = true;
return info;
};
// TODO: these are great candidates for special test coverage!
var _snInvalid = /[^A-Z0-9$%'-_@~`!(){}^#&.]/g; // NOTE: '.' is not valid but we split it away
exports.shortname = function (name) {
var lossy = false;
// TODO: support preservation of case for otherwise non-lossy name!
name = name.toUpperCase().replace(/ /g, '').replace(/^\.+/, '');
name = name.replace(_snInvalid, function () {
lossy = true;
return '_';
});
var parts = name.split('.'),
basis3 = parts.pop(),
basis8 = parts.join('');
if (!parts.length) {
basis8 = basis3;
basis3 = ' ';
}
if (basis8.length > 8) {
basis8 = basis8.slice(0,8);
// NOTE: technically, spec's "lossy conversion" flag is NOT set by excess length.
// But since lossy conversion and truncated names both need a numeric tail…
lossy = true;
} else while (basis8.length < 8) basis8 += ' ';
if (basis3.length > 3) {
basis3 = basis3.slice(0,3);
lossy = true;
} else while (basis3.length < 3) basis3 += ' ';
return {filename:basis8, extension:basis3, _lossy:lossy};
return {basis:[basis8,basis3], lossy:lossy};
};
//shortname("autoexec.bat") => {basis:['AUTOEXEC','BAT'],lossy:false}
//shortname("autoexecutable.batch") => {basis:['AUTOEXEC','BAT'],lossy:true}
// TODO: OS X stores `shortname("._.Trashes")` as ['~1', 'TRA'] — should we?
var _lnInvalid = /[^a-zA-Z0-9$%'-_@~`!(){}^#&.+,;=[\] ]/g;
exports.longname = function (name) {
name = name.trim().replace(/\.+$/, '').replace(_lnInvalid, function (c) {
if (c.length > 1) throw Error("Internal problem: unexpected match length!");
if (c.charCodeAt(0) > 127) return c;
else throw Error("Invalid character "+JSON.stringify(c)+" in name.");
lossy = true;
return '_';
});
if (name.length > 255) throw Error("Name is too long.");
return name;
};
function nameChkSum(sum, c) {
return ((sum & 1) ? 0x80 : 0) + (sum >>> 1) + c & 0xFF;
}
// WORKAROUND: https://github.com/tessel/beta/issues/335
function reduceBuffer(buf, start, end, fn, res) {
// NOTE: does not handle missing `res` like Array.prototype.reduce would
for (var i = start; i < end; ++i) {
res = fn(res, buf[i]);
}
return res;
}
exports.checksumName = function (buf,off) {
off || (off = 0);
var len = S.dirEntry.fields['Name'].size;
return reduceBuffer(buf, off, off+len, nameChkSum, 0);
};
/* comparing C rounding trick from FAT spec with Math.ceil
function tryBoth(d) {
var a = ((D.RootEntCnt * 32) + (D.BytsPerSec - 1)) / D.BytsPerSec >>> 0,
b = Math.ceil((D.RootEntCnt * 32) / D.BytsPerSec);
if (b !== a) console.log("try", b, a, (b === a) ? '' : '*');
return (b === a);
}
// BytsPerSec — "may take on only the following values: 512, 1024, 2048 or 4096"
[512, 1024, 2048, 4096].forEach(function (bps) {
// RootEntCnt — "a count that when multiplied by 32 results in an even multiple of BPB_BytsPerSec"
for (var evenMultiplier = 0; evenMultiplier < 1024*1024*16; evenMultiplier += 2) {
var rec = (bps * evenMultiplier) / 32;
tryBoth({RootEntCnt:rec, BytsPerSec:bps});
}
});
*/
exports.fmtHex = function (n, ff) {
return (1+ff+n).toString(16).slice(1);
};
exports.delayedCall = function (fn) {
if (!fn) throw Error("No function provided!"); // debug aid
var ctx = this,
args = Array.prototype.slice.call(arguments, 1);
setImmediate(function () {
fn.apply(ctx, args);
});
};
exports.adjustedPos = function (vol, pos, bytes) {
var _pos = {
chain: pos.chain,
sector: pos.sector,
offset: pos.offset + bytes
}, secSize = vol._sectorSize;
while (_pos.offset >= secSize) {
_pos.sector += 1;
_pos.offset -= secSize;
}
return _pos;
};
exports.extend = _xok;
var _prevDbg = Date.now(),
_thresh = 50;
function log(level) {
if (level < log.level) return;
var now = Date.now(),
diff = now - _prevDbg;
arguments[0] = ((diff < _thresh) ? " " : '') + diff.toFixed(0) + "ms";
console.log.apply(console, arguments);
_prevDbg = now;
}
log.DBG = -4;
log.INFO = -3;
log.WARN = -2;
log.ERR = -1;
log.level = log.WARN;
exports.log = log;
}).call(this,require("buffer").Buffer,require("timers").setImmediate)
},{"./structs.js":38,"buffer":8,"timers":35,"xok":37}],5:[function(require,module,exports){
(function (process){
var events = require('events'),
streams = require('stream'),
fifolock = require('fifolock'),
S = require("./structs.js"),
_ = require("./helpers.js");
//_.log.level = _.log.DBG;
exports.createFileSystem = function (volume, opts, cb) {
if (typeof opts === 'function') {
cb = opts;
opts = null;
}
opts = _.extend({
// c.f. https://www.kernel.org/doc/Documentation/filesystems/vfat.txt
ro: false,
noatime: true,
modmode: 0111, // or `07000`
umask: ('umask' in process) ? process.umask() : 0022,
uid: ('getuid' in process) ? process.getuid() : 0,
gid: ('getgid' in process) ? process.getgid() : 0
}, opts);
if (!volume.writeSectors) opts.ro = true;
if (opts.ro) opts.noatime = true; // natch
var fs = new events.EventEmitter(),
vol = null,
dir = require("./dir.js"),
c = require("./chains.js"),
q = fifolock();
var GROUP = (_.log.level < _.log.INFO) ? q.TRANSACTION_WRAPPER.bind({
postAcquire: function (proceed) {
_.log(_.log.DBG, "=== Starting GROUP ===");
proceed();
},
preRelease: function (finish) {
_.log(_.log.DBG, "=== Finishing GROUP ===");
finish();
}
}) : q.TRANSACTION_WRAPPER;
q.acquire(function (unlock) { // because of this, callers can start before 'ready'
var d = _.allocBuffer(volume.sectorSize);
volume.readSectors(0, d, function (e) {
if (e) fs.emit('error', e);
else {
try {
init(d);
} catch (e) {
fs.emit('error', e);
unlock();
return;
}
fs.emit('ready');
}
unlock();
});
});
if (cb) fs.on('error', cb).on('ready', cb.bind(null, null));
function init(bootSector) {
vol = require("./vol.js").init(volume, opts, bootSector);
fs._dirIterator = dir.iterator.bind(dir);
var entryInfoByPath = {},
baseEntry = {
_refs: 0,
_record: function () {
entryInfoByPath[this.path] = this;
if (this.parent) this.parent.retain();
return this;
},
retain: function () {
if (!this._refs) this._record();
this._refs += 1;
return this;
},
release: function () {
this._refs -= 1;
if (!this._refs) this._rescind();
},
_rescind: function () {
if (this.parent) this.parent.release();
delete entryInfoByPath[this.path];
}
};
fs._createSharedEntry = function (path, entry, chain, parent) {
return _.extend(Object.create(baseEntry), {
_refs: 0, // WORKAROUND: https://github.com/tessel/beta/issues/455
path: path,
entry: entry,
chain: chain,
parent: parent
}).retain();
};
fs._createSharedEntry("/", {Attr:{directory:true}}, vol.rootDirectoryChain);
fs._sharedEntryForSteps = function (steps, opts, cb) { // NOTE: may `cb` before returning!
var path = steps.join('/') || "/",
name = steps.pop(), // n.b.
info = entryInfoByPath[path];
if (info) cb(null, info.retain());
else fs._sharedEntryForSteps(steps, {}, function (e,parentInfo) { // n.b. `steps` don't include `name`
if (e) cb(e);
else if (!parentInfo.entry.Attr.directory) cb(S.err.NOTDIR())
else dir.findInDirectory(vol, parentInfo.chain, name, opts, function (e,entry) {
if (e && !opts.prepareForCreate) cb(e);
else if (e) cb(e, {missingChild:_.extend(entry, {name:name}), parent:parentInfo});
else cb(null, fs._createSharedEntry(path, entry, vol.chainForCluster(entry._firstCluster), parentInfo));
});
});
}
fs._updateEntry = dir.updateEntry.bind(dir, vol);
fs._makeStat = dir.makeStat.bind(dir, vol);
fs._addFile = dir.addFile.bind(dir, vol);
fs._initDir = dir.init.bind(dir, vol);
}
/**** ---- CORE API ---- ****/
// NOTE: we really don't share namespace, but avoid first three anyway…
var fileDescriptors = [null,null,null];
fs.open = function (path, flags, mode, cb, _n_) {
if (typeof mode === 'function') {
_n_ = cb;
cb = mode;
mode = 0666;
}
cb = GROUP(cb, function () {
var _fd = {flags:null,entry:null,chain:null,pos:0},
f = _.parseFlags(flags);
if (vol.opts.ro && (f.write || f.create || f.truncate)) return _.delayedCall(cb, S.err.ROFS());
else _fd.flags = f;
fs._sharedEntryForSteps(_.absoluteSteps(path), {prepareForCreate:f.create}, function (e,info) {
if (e && !(e.code === 'NOENT' && f.create && info)) cb(e);
else if (e) fs._addFile(info.parent.chain, info.missingChild, {dir:f._openDir}, function (e,newEntry,newChain) {
if (e) cb(e);
else finish(fs._createSharedEntry(_.absolutePath(path), newEntry, newChain, info.parent));
});
else if (info && f.exclusive) cb(S.err.EXIST());
else if (info.entry.Attr.directory && !f._openDir) cb(S.err.ISDIR());
else if (f.write && info.entry.Attr.readonly) cb(S.err.ACCES());
else finish(info);
function finish(fileInfo) {
var fd = fileDescriptors.push(_fd)-1;
_fd.info = fileInfo;
_fd.entry = fileInfo.entry;
_fd.chain = fileInfo.chain;
if (f.append) _fd.pos = _fd.entry._size;
if (f._openDir) _fd.chain.cacheAdvice = 'WILLNEED';
if (f.truncate && _fd.entry._size) fs.ftruncate(fd, 0, function (e) {
cb(e, fd);
}, '_nested_');
else _.delayedCall(cb, null, fd); // (delay in case fs._sharedEntryForSteps all cached!)
}
});
}, (_n_ === '_nested_')); };
fs.fstat = function (fd, cb, _n_) { cb = GROUP(cb, function () {
var _fd = fileDescriptors[fd];
if (!_fd || !_fd.flags.read) _.delayedCall(cb, S.err.BADF());
else _.delayedCall(cb, null, fs._makeStat(_fd.entry));
}, (_n_ === '_nested_')); };
fs.futimes = function (fd, atime, mtime, cb, _n_) { cb = GROUP(cb, function () {
var _fd = fileDescriptors[fd];
if (!_fd || !_fd.flags.write) _.delayedCall(cb, S.err.BADF());
// NOTE: ctime would get touched on POSIX; but we map that to create time!
else fs._updateEntry(_fd.entry, {atime:atime||true,mtime:mtime||true}, cb);
}, (_n_ === '_nested_')); };
fs.fchmod = function (fd, mode, cb, _n_) { cb = GROUP(cb, function () {
var _fd = fileDescriptors[fd];
if (!_fd || !_fd.flags.write) _.delayedCall(cb, S.err.BADF());
else {
mode &= S._I._chmoddable;
if (_fd.entry.Attr.directory) mode |= S._I.FDIR;
else if (!_fd.entry.Attr.volume_id) mode |= S._I.FREG;
fs._updateEntry(_fd.entry, {mode:mode}, cb);
}
}, (_n_ === '_nested_')); };
fs.read = function (fd, buf, off, len, pos, cb, _n_) { cb = GROUP(cb, function () {
var _fd = fileDescriptors[fd];
if (!_fd || !_fd.flags.read) _.delayedCall(cb, S.err.BADF());
var _pos = (pos === null) ? _fd.pos : pos,
_len = Math.min(len, _fd.entry._size - _pos),
_buf = buf.slice(off,off+_len);
_fd.chain.readFromPosition(_pos, _buf, function (e,bytes,slice) {
if (_.workaroundTessel380) _buf.copy(buf,off); // WORKAROUND: https://github.com/tessel/beta/issues/380
_fd.pos = _pos + bytes;
if (e || vol.opts.noatime) finish(e);
else fs._updateEntry(_fd.entry, {atime:true}, finish);
function finish(e) {
cb(e,bytes,buf);
}
});
}, (_n_ === '_nested_')); };
fs._readdir = function (fd, cb, _n_) { cb = GROUP(cb, function () {
var _fd = fileDescriptors[fd];
if (!_fd || !_fd.flags.read) _.delayedCall(cb, S.err.BADF());
else {
var entryNames = [],
getNextEntry = fs._dirIterator(_fd.chain);
function processNext() {
getNextEntry(function (e,d) {
if (e) cb(e);
else if (!d && !entryNames.length) cb(null, entryNames); // WORKAROUND: https://github.com/tessel/beta/issues/435
else if (!d) cb(null, entryNames.sort()); // NOTE: sort not required, but… [simplifies tests for starters!]
else {
if (d._name !== "." && d._name !== "..") entryNames.push(d._name);
processNext();
}
});
}
processNext();
}
}, (_n_ === '_nested_')); };
fs._mkdir = function (fd, cb, _n_) { cb = GROUP(cb, function () {
var _fd = fileDescriptors[fd];
if (!_fd || !_fd.flags.write) _.delayedCall(cb, S.err.BADF());
else fs._initDir(_fd.info, cb);
}, (_n_ === '_nested_')); };
fs.write = function (fd, buf, off, len, pos, cb, _n_) { cb = GROUP(cb, function () {
var _fd = fileDescriptors[fd];
if (!_fd || !_fd.flags.write) _.delayedCall(cb, S.err.BADF());
var _pos = (pos === null || _fd.flags.append) ? _fd.pos : pos,
_buf = buf.slice(off,off+len);
if (_pos > _fd.entry._size) {
// TODO: handle huge jumps by zeroing clusters individually?
var padLen = _pos - _fd.entry._size,
padBuf = _.allocBuffer(padLen + _buf.length);
padBuf.fill(0x00, 0, padLen);
_buf.copy(padBuf, padLen);
_pos = _fd.entry._size;
_buf = padBuf;
}
_fd.chain.writeToPosition(_pos, _buf, function (e) {
_fd.pos = _pos + len;
var newSize = Math.max(_fd.entry._size, _fd.pos),
newInfo = {size:newSize,_touch:true};
fs._updateEntry(_fd.entry, newInfo, function (ee) {
cb(e||ee, len, buf);
});
});
}, (_n_ === '_nested_')); };
fs.ftruncate = function (fd, len, cb, _n_) { cb = GROUP(cb, function () {
var _fd = fileDescriptors[fd];
if (!_fd || !_fd.flags.write) _.delayedCall(cb, S.err.BADF());
var newStats = {size:len,_touch:true};
// NOTE: we order operations for best state in case of only partial success
if (len === _fd.entry._size) _.delayedCall(cb);
else if (len < _fd.entry._size) fs._updateEntry(_fd.entry, newStats, function (e) {
if (e) cb(e);
else _fd.chain.truncate(Math.ceil(len / _fd.chain.sectorSize), cb);
}); // TODO: handle huge file expansions without as much memory pressure
else _fd.chain.writeToPosition(_fd.entry._size, _.allocBuffer(len-_fd.entry._size, 0x00), function (e) {
if (e) cb(e);
else fs._updateEntry(_fd.entry, newStats, cb);
});
}, (_n_ === '_nested_')); };
// 'NORMAL', 'SEQUENTIAL', 'RANDOM', 'WILLNEED', 'DONTNEED', 'NOREUSE'
fs._fadviseSync = function (fd, off, len, advice) {
if (off !== 0 || len !== 0) throw Error("Cache advise can currently be given only for whole file!");
var _fd = fileDescriptors[fd];
if (!_fd) throw S.err.BADF();
else _fd.chain.cacheAdvice = advice;
};
fs.fsync = function (fd, cb) {
// NOTE: we'll need to flush write cache here once we have one…
var _fd = fileDescriptors[fd];
if (!_fd) _.delayedCall(cb, S.err.BADF());
else _.delayedCall(cb);
};
fs.close = function (fd, cb) {
var _fd = fileDescriptors[fd];
if (!_fd) _.delayedCall(cb, S.err.BADF());
else setTimeout(_fd.info.release.bind(_fd.info), 500), _.delayedCall(cb, fileDescriptors[fd] = null);
};
/* STREAM WRAPPERS */
var workaroundTessel436;
try {
new require('stream').Readable({encoding:'utf8'});
new streams.Readable({encoding:'utf8'});
} catch (e) {
workaroundTessel436 = true;
}
function _createStream(StreamType, path, opts) {
// [NOT REALLY A] WORKAROUND: https://github.com/tessel/beta/issues/436
if (workaroundTessel436 && 'encoding' in opts) {
console.warn("Tessel does not currently support encoding option for Readable streams, discarding!");
delete opts.encoding;
}
var fd = (opts.fd !== null) ? opts.fd : '_opening_',
pos = opts.start,
stream = new StreamType(opts);
if (fd === '_opening_') fs.open(path, opts.flags, opts.mode, function (e,_fd) {
if (e) {
fd = '_open_error_';
stream.emit('error', e);
} else {
fd = _fd;
fs._fadviseSync(fd, 0, 0, 'SEQUENTIAL');
stream.emit('open', fd);
}
});
function autoClose(tombstone) { // NOTE: assumes caller will clear `fd`
if (opts.autoClose) fs.close(fd, function (e) {
if (e) stream.emit('error', e);
else stream.emit('close');
});
fd = tombstone;
}
if (StreamType === streams.Readable) {
stream._read = function (n) {
var buf;
// TODO: optimize to fetch at least a full sector regardless of `n`…
n = Math.min(n, opts.end-pos);
if (fd === '_opening_') stream.once('open', function () { stream._read(n); });
else if (pos > opts.end) stream.push(null);
else if (n > 0) buf = _.allocBuffer(n), fs.read(fd, buf, 0, n, pos, function (e,n,d) {
if (e) {
autoClose('_read_error_');
stream.emit('error', e);
} else stream.push((n) ? d.slice(0,n) : null);
}), pos += n;
else stream.push(null);
};
stream.once('end', function () {
autoClose('_ended_');
});
} else if (StreamType === streams.Writable) {
stream.bytesWritten = 0;
stream._write = function (data, _enc, cb) {
if (fd === '_opening_') stream.once('open', function () { stream._write(data, null, cb); });
else fs.write(fd, data, 0, data.length, pos, function (e,n) {
if (e) {
autoClose('_write_error_');
cb(e);
} else {
stream.bytesWritten += n;
cb();
}
}), pos += data.length;
};
stream.once('finish', function () {
autoClose('_finished_');
});
}
return stream;
}
fs.createReadStream = function (path, opts) {
return _createStream(streams.Readable, path, _.extend({
start: 0,
end: Infinity,
flags: 'r',
mode: 0666,
encoding: null,
fd: null, // ??? see https://github.com/joyent/node/issues/7708
autoClose: true
}, opts));
};
fs.createWriteStream = function (path, opts) {
return _createStream(streams.Writable, path, _.extend({
start: 0,
flags: 'w',
mode: 0666,
//encoding: null, // see https://github.com/joyent/node/issues/7710
fd: null, // ??? see https://github.com/joyent/node/issues/7708
autoClose: true
}, opts, {decodeStrings:true, objectMode:false}));
};
/* PATH WRAPPERS (albeit the only public interface for some folder operations) */
function _fdOperation(path, opts, fn, cb) { cb = GROUP(cb, function () {
opts.advice || (opts.advice = 'NORMAL');
fs.open(path, opts.flag, function (e,fd) {
if (e) cb(e);
else fs._fadviseSync(fd, 0, 0, opts.advice), fn(fd, function () {
var ctx = this, args = arguments;
fs.close(fd, function (closeErr) {
cb.apply(ctx, args);
}, '_nested_');
});
}, '_nested_');
}); }
fs.stat = fs.lstat = function (path, cb) {
_fdOperation(path, {flag:'r'}, function (fd, cb) {
fs.fstat(fd, cb, '_nested_');
}, cb);
};
fs.exists = function(path, cb){
fs.stat(path, function(err){
cb(err ? false : true);
});
};
fs.readFile = function (path, opts, cb) {
if (typeof opts === 'function') {
cb = opts;
opts = {};
}
opts.flag || (opts.flag = 'r');
opts.advice || (opts.advice = 'NOREUSE');
_fdOperation(path, opts, function (fd, cb) {
fs.fstat(fd, function (e,stat) {
if (e) return cb(e);
else {
var buffer = _.allocBuffer(stat.size);
fs.read(fd, buffer, 0, buffer.length, null, function (e) {
if (e) cb(e);
else cb(null, (opts.encoding) ? buffer.toString(opts.encoding) : buffer);
}, '_nested_');
}
}, '_nested_');
}, cb);
};
fs.writeFile = function (path, data, opts, cb) {
if (typeof opts === 'function') {
cb = opts;
opts = {};
}
opts.flag || (opts.flag = 'w');
opts.advice || (opts.advice = 'NOREUSE');
_fdOperation(path, opts, function (fd, cb) {
if (typeof data === 'string') data = _.bufferFrom(data, opts.encoding || 'utf8');
fs.write(fd, data, 0, data.length, null, function (e) { cb(e); }, '_nested_');
}, cb);
};
fs.appendFile = function (path, data, opts, cb) {
if (typeof opts === 'function') {
cb = opts;
opts = {};
}
opts.flag || (opts.flag = 'a');
fs.writeFile(path, data, opts, cb);
};
fs.truncate = function (path, len, cb) {
_fdOperation(path, {flag:'r+'}, function (fd, cb) {
fs.ftruncate(fd, len, cb, '_nested_');
}, cb);
};
fs.readdir = function (path, cb) {
_fdOperation(path, {flag:'\\r'}, function (fd, cb) {
fs._readdir(fd, cb, '_nested_');
}, cb);
};
fs.mkdir = function (path, mode, cb) {
if (typeof mode === 'function') {
cb = mode;
mode = 0777;
}
_fdOperation(path, {flag:'\\wx'}, function (fd, cb) {
fs._mkdir(fd, cb, '_nested_');
}, cb);
};
fs.utimes = function (path, atime, mtime, cb) {
_fdOperation(path, {flag:'r+'}, function (fd, cb) {
fs.futimes(fd, atime, mtime, cb, '_nested_');
}, cb);
};
fs.chmod = fs.lchmod = function (path, mode, cb) {
_fdOperation(path, {flag:'\\r+'}, function (fd, cb) {
fs.fchmod(fd, mode, cb, '_nested_');
}, cb);
};
fs.chown = fs.lchown = function (path, uid, gid, cb) {
_fdOperation(path, {flag:'\\r+'}, function (fd, cb) {
fs.fchown(fd, uid, gid, cb, '_nested_');
}, cb);
};
/* STUBS */
fs.link = function (src, dst, cb) {
// NOTE: theoretically we _could_ do hard links [with untracked `stat.nlink` count…]
_.delayedCall(cb, S.err.NOSYS());
};
fs.symlink = function (src, dst, type, cb) {
if (typeof type === 'function') {
cb = type;
type = null;
}
_.delayedCall(cb, S.err.NOSYS());
};
fs.readlink = function (path, cb) {
_fdOperation(path, {flag:'\\r'}, function (fd, cb) {
// the named file is *never* a symbolic link…
// NOTE: we still use _fdOperation for catching e.g. NOENT/NOTDIR errors…
cb(S.err.INVAL());
}, cb);
};
fs.realpath = function (path, cache, cb) {
if (typeof cache === 'function') {
cb = cache;
cache = null;
}
if (cache) _.delayedCall(cb, S.err.NOSYS()); // TODO: what would be involved here?
else _fdOperation(path, {flag:'\\r'}, function (fd, cb) {
cb(null, _.absolutePath(path));
}, cb);
};
fs.fchown = function (fd, uid, gid, cb, _n_) { cb = GROUP(cb, function () {
var _fd = fileDescriptors[fd];
if (!_fd || !_fd.flags.write) _.delayedCall(cb, S.err.BADF());
else _.delayedCall(cb, S.err.NOSYS());
}, (_n_ === '_nested_')); };
return fs;
}
}).call(this,require('_process'))
},{"./chains.js":2,"./dir.js":3,"./helpers.js":4,"./structs.js":38,"./vol.js":39,"_process":17,"events":10,"fifolock":11,"stream":33}],6:[function(require,module,exports){
'use strict'
exports.byteLength = byteLength
exports.toByteArray = toByteArray
exports.fromByteArray = fromByteArray
var lookup = []
var revLookup = []
var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array
var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
for (var i = 0, len = code.length; i < len; ++i) {
lookup[i] = code[i]
revLookup[code.charCodeAt(i)] = i
}
// Support decoding URL-safe base64 strings, as Node.js does.
// See: https://en.wikipedia.org/wiki/Base64#URL_applications
revLookup['-'.charCodeAt(0)] = 62
revLookup['_'.charCodeAt(0)] = 63
function getLens (b64) {
var len = b64.length
if (len % 4 > 0) {
throw new Error('Invalid string. Length must be a multiple of 4')
}
// Trim off extra bytes after placeholder bytes are found
// See: https://github.com/beatgammit/base64-js/issues/42
var validLen = b64.indexOf('=')
if (validLen === -1) validLen = len
var placeHoldersLen = validLen === len
? 0
: 4 - (validLen % 4)
return [validLen, placeHoldersLen]
}
// base64 is 4/3 + up to two characters of the original data
function byteLength (b64) {
var lens = getLens(b64)
var validLen = lens[0]
var placeHoldersLen = lens[1]
return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
}
function _byteLength (b64, validLen, placeHoldersLen) {
return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen
}
function toByteArray (b64) {
var tmp
var lens = getLens(b64)
var validLen = lens[0]
var placeHoldersLen = lens[1]
var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))
var curByte = 0
// if there are placeholders, only get up to the last complete 4 chars
var len = placeHoldersLen > 0
? validLen - 4
: validLen
var i
for (i = 0; i < len; i += 4) {
tmp =
(revLookup[b64.charCodeAt(i)] << 18) |
(revLookup[b64.charCodeAt(i + 1)] << 12) |
(revLookup[b64.charCodeAt(i + 2)] << 6) |
revLookup[b64.charCodeAt(i + 3)]
arr[curByte++] = (tmp >> 16) & 0xFF
arr[curByte++] = (tmp >> 8) & 0xFF
arr[curByte++] = tmp & 0xFF
}
if (placeHoldersLen === 2) {
tmp =
(revLookup[b64.charCodeAt(i)] << 2) |
(revLookup[b64.charCodeAt(i + 1)] >> 4)
arr[curByte++] = tmp & 0xFF
}
if (placeHoldersLen === 1) {
tmp =
(revLookup[b64.charCodeAt(i)] << 10) |
(revLookup[b64.charCodeAt(i + 1)] << 4) |
(revLookup[b64.charCodeAt(i + 2)] >> 2)
arr[curByte++] = (tmp >> 8) & 0xFF
arr[curByte++] = tmp & 0xFF
}
return arr
}
function tripletToBase64 (num) {
return lookup[num >> 18 & 0x3F] +
lookup[num >> 12 & 0x3F] +
lookup[num >> 6 & 0x3F] +
lookup[num & 0x3F]
}
function encodeChunk (uint8, start, end) {
var tmp
var output = []
for (var i = start; i < end; i += 3) {
tmp =
((uint8[i] << 16) & 0xFF0000) +
((uint8[i + 1] << 8) & 0xFF00) +
(uint8[i + 2] & 0xFF)
output.push(tripletToBase64(tmp))
}
return output.join('')
}
function fromByteArray (uint8) {
var tmp
var len = uint8.length
var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
var parts = []
var maxChunkLength = 16383 // must be multiple of 3
// go through the array every three bytes, we'll deal with trailing stuff later
for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
parts.push(encodeChunk(
uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)
))
}
// pad the end with zeros, but make sure to not forget the extra bytes
if (extraBytes === 1) {
tmp = uint8[len - 1]
parts.push(
lookup[tmp >> 2] +
lookup[(tmp << 4) & 0x3F] +
'=='
)
} else if (extraBytes === 2) {
tmp = (uint8[len - 2] << 8) + uint8[len - 1]
parts.push(
lookup[tmp >> 10] +
lookup[(tmp >> 4) & 0x3F] +
lookup[(tmp << 2) & 0x3F] +
'='
)
}
return parts.join('')
}
},{}],7:[function(require,module,exports){
},{}],8:[function(require,module,exports){
(function (Buffer){
/*!
* The buffer module from node.js, for the browser.
*
* @author Feross Aboukhadijeh <https://feross.org>
* @license MIT
*/
/* eslint-disable no-proto */
'use strict'
var base64 = require('base64-js')
var ieee754 = require('ieee754')
exports.Buffer = Buffer
exports.SlowBuffer = SlowBuffer
exports.INSPECT_MAX_BYTES = 50
var K_MAX_LENGTH = 0x7fffffff
exports.kMaxLength = K_MAX_LENGTH
/**
* If `Buffer.TYPED_ARRAY_SUPPORT`:
* === true Use Uint8Array implementation (fastest)
* === false Print warning and recommend using `buffer` v4.x which has an Object
* implementation (most compatible, even IE6)
*
* Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
* Opera 11.6+, iOS 4.2+.
*
* We report that the browser does not support typed arrays if the are not subclassable
* using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
* (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
* for __proto__ and has a buggy typed array implementation.
*/
Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()
if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
typeof console.error === 'function') {
console.error(
'This browser lacks typed array (Uint8Array) support which is required by ' +
'`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
)
}
function typedArraySupport () {
// Can typed array instances can be augmented?
try {
var arr = new Uint8Array(1)
arr.__proto__ = { __proto__: Uint8Array.prototype, foo: function () { return 42 } }
return arr.foo() === 42
} catch (e) {
return false
}
}
Object.defineProperty(Buffer.prototype, 'parent', {
enumerable: true,
get: function () {
if (!Buffer.isBuffer(this)) return undefined
return this.buffer
}
})
Object.defineProperty(Buffer.prototype, 'offset', {
enumerable: true,
get: function () {
if (!Buffer.isBuffer(this)) return undefined
return this.byteOffset
}
})
function createBuffer (length) {
if (length > K_MAX_LENGTH) {
throw new RangeError('The value "' + length + '" is invalid for option "size"')
}
// Return an augmented `Uint8Array` instance
var buf = new Uint8Array(length)
buf.__proto__ = Buffer.prototype
return buf
}
/**
* The Buffer constructor returns instances of `Uint8Array` that have their
* prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
* `Uint8Array`, so the returned instances will have all the node `Buffer` methods
* and the `Uint8Array` methods. Square bracket notation works as expected -- it
* returns a single octet.
*
* The `Uint8Array` prototype remains unmodified.
*/
function Buffer (arg, encodingOrOffset, length) {
// Common case.
if (typeof arg === 'number') {
if (typeof encodingOrOffset === 'string') {
throw new TypeError(
'The "string" argument must be of type string. Received type number'
)
}
return allocUnsafe(arg)
}
return from(arg, encodingOrOffset, length)
}
// Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
if (typeof Symbol !== 'undefined' && Symbol.species != null &&
Buffer[Symbol.species] === Buffer) {
Object.defineProperty(Buffer, Symbol.species, {
value: null,
configurable: true,
enumerable: false,
writable: false
})
}
Buffer.poolSize = 8192 // not used by this implementation
function from (value, encodingOrOffset, length) {
if (typeof value === 'string') {
return fromString(value, encodingOrOffset)
}
if (ArrayBuffer.isView(value)) {
return fromArrayLike(value)
}
if (value == null) {
throw TypeError(
'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
'or Array-like Object. Received type ' + (typeof value)
)
}
if (isInstance(value, ArrayBuffer) ||
(value && isInstance(value.buffer, ArrayBuffer))) {
return fromArrayBuffer(value, encodingOrOffset, length)
}
if (typeof value === 'number') {
throw new TypeError(
'The "value" argument must not be of type number. Received type number'
)
}
var valueOf = value.valueOf && value.valueOf()
if (valueOf != null && valueOf !== value) {
return Buffer.from(valueOf, encodingOrOffset, length)
}
var b = fromObject(value)
if (b) return b
if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null &&
typeof value[Symbol.toPrimitive] === 'function') {
return Buffer.from(
value[Symbol.toPrimitive]('string'), encodingOrOffset, length
)
}
throw new TypeError(
'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
'or Array-like Object. Received type ' + (typeof value)
)
}
/**
* Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
* if value is a number.
* Buffer.from(str[, encoding])
* Buffer.from(array)
* Buffer.from(buffer)
* Buffer.from(arrayBuffer[, byteOffset[, length]])
**/
Buffer.from = function (value, encodingOrOffset, length) {
return from(value, encodingOrOffset, length)
}
// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
// https://github.com/feross/buffer/pull/148
Buffer.prototype.__proto__ = Uint8Array.prototype
Buffer.__proto__ = Uint8Array
function assertSize (size) {
if (typeof size !== 'number') {
throw new TypeError('"size" argument must be of type number')
} else if (size < 0) {
throw new RangeError('The value "' + size + '" is invalid for option "size"')
}
}
function alloc (size, fill, encoding) {
assertSize(size)
if (size <= 0) {
return createBuffer(size)
}
if (fill !== undefined) {
// Only pay attention to encoding if it's a string. This
// prevents accidentally sending in a number that would
// be interpretted as a start offset.
return typeof encoding === 'string'
? createBuffer(size).fill(fill, encoding)
: createBuffer(size).fill(fill)
}
return createBuffer(size)
}
/**
* Creates a new filled Buffer instance.
* alloc(size[, fill[, encoding]])
**/
Buffer.alloc = function (size, fill, encoding) {
return alloc(size, fill, encoding)
}
function allocUnsafe (size) {
assertSize(size)
return createBuffer(size < 0 ? 0 : checked(size) | 0)
}
/**
* Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
* */
Buffer.allocUnsafe = function (size) {
return allocUnsafe(size)
}
/**
* Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
*/
Buffer.allocUnsafeSlow = function (size) {
return allocUnsafe(size)
}
function fromString (string, encoding) {
if (typeof encoding !== 'string' || encoding === '') {
encoding = 'utf8'
}
if (!Buffer.isEncoding(encoding)) {
throw new TypeError('Unknown encoding: ' + encoding)
}
var length = byteLength(string, encoding) | 0
var buf = createBuffer(length)
var actual = buf.write(string, encoding)
if (actual !== length) {
// Writing a hex string, for example, that contains invalid characters will
// cause everything after the first invalid character to be ignored. (e.g.
// 'abxxcd' will be treated as 'ab')
buf = buf.slice(0, actual)
}
return buf
}
function fromArrayLike (array) {
var length = array.length < 0 ? 0 : checked(array.length) | 0
var buf = createBuffer(length)
for (var i = 0; i < length; i += 1) {
buf[i] = array[i] & 255
}
return buf
}
function fromArrayBuffer (array, byteOffset, length) {
if (byteOffset < 0 || array.byteLength < byteOffset) {
throw new RangeError('"offset" is outside of buffer bounds')
}
if (array.byteLength < byteOffset + (length || 0)) {
throw new RangeError('"length" is outside of buffer bounds')
}
var buf
if (byteOffset === undefined && length === undefined) {
buf = new Uint8Array(array)
} else if (length === undefined) {
buf = new Uint8Array(array, byteOffset)
} else {
buf = new Uint8Array(array, byteOffset, length)
}
// Return an augmented `Uint8Array` instance
buf.__proto__ = Buffer.prototype
return buf
}
function fromObject (obj) {
if (Buffer.isBuffer(obj)) {
var len = checked(obj.length) | 0
var buf = createBuffer(len)
if (buf.length === 0) {
return buf
}
obj.copy(buf, 0, 0, len)
return buf
}
if (obj.length !== undefined) {
if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
return createBuffer(0)
}
return fromArrayLike(obj)
}
if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
return fromArrayLike(obj.data)
}
}
function checked (length) {
// Note: cannot use `length < K_MAX_LENGTH` here because that fails when
// length is NaN (which is otherwise coerced to zero.)
if (length >= K_MAX_LENGTH) {
throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
}
return length | 0
}
function SlowBuffer (length) {
if (+length != length) { // eslint-disable-line eqeqeq
length = 0
}
return Buffer.alloc(+length)
}
Buffer.isBuffer = function isBuffer (b) {
return b != null && b._isBuffer === true &&
b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
}
Buffer.compare = function compare (a, b) {
if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
throw new TypeError(
'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
)
}
if (a === b) return 0
var x = a.length
var y = b.length
for (var i = 0, len = Math.min(x, y); i < len; ++i) {
if (a[i] !== b[i]) {
x = a[i]
y = b[i]
break
}
}
if (x < y) return -1
if (y < x) return 1
return 0
}
Buffer.isEncoding = function isEncoding (encoding) {
switch (String(encoding).toLowerCase()) {
case 'hex':
case 'utf8':
case 'utf-8':
case 'ascii':
case 'latin1':
case 'binary':
case 'base64':
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return true
default:
return false
}
}
Buffer.concat = function concat (list, length) {
if (!Array.isArray(list)) {
throw new TypeError('"list" argument must be an Array of Buffers')
}
if (list.length === 0) {
return Buffer.alloc(0)
}
var i
if (length === undefined) {
length = 0
for (i = 0; i < list.length; ++i) {
length += list[i].length
}
}
var buffer = Buffer.allocUnsafe(length)
var pos = 0
for (i = 0; i < list.length; ++i) {
var buf = list[i]
if (isInstance(buf, Uint8Array)) {
buf = Buffer.from(buf)
}
if (!Buffer.isBuffer(buf)) {
throw new TypeError('"list" argument must be an Array of Buffers')
}
buf.copy(buffer, pos)
pos += buf.length
}
return buffer
}
function byteLength (string, encoding) {
if (Buffer.isBuffer(string)) {
return string.length
}
if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
return string.byteLength
}
if (typeof string !== 'string') {
throw new TypeError(
'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
'Received type ' + typeof string
)
}
var len = string.length
var mustMatch = (arguments.length > 2 && arguments[2] === true)
if (!mustMatch && len === 0) return 0
// Use a for loop to avoid recursion
var loweredCase = false
for (;;) {
switch (encoding) {
case 'ascii':
case 'latin1':
case 'binary':
return len
case 'utf8':
case 'utf-8':
return utf8ToBytes(string).length
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return len * 2
case 'hex':
return len >>> 1
case 'base64':
return base64ToBytes(string).length
default:
if (loweredCase) {
return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
}
encoding = ('' + encoding).toLowerCase()
loweredCase = true
}
}
}
Buffer.byteLength = byteLength
function slowToString (encoding, start, end) {
var loweredCase = false
// No need to verify that "this.length <= MAX_UINT32" since it's a read-only
// property of a typed array.
// This behaves neither like String nor Uint8Array in that we set start/end
// to their upper/lower bounds if the value passed is out of range.
// undefined is handled specially as per ECMA-262 6th Edition,
// Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
if (start === undefined || start < 0) {
start = 0
}
// Return early if start > this.length. Done here to prevent potential uint32
// coercion fail below.
if (start > this.length) {
return ''
}
if (end === undefined || end > this.length) {
end = this.length
}
if (end <= 0) {
return ''
}
// Force coersion to uint32. This will also coerce falsey/NaN values to 0.
end >>>= 0
start >>>= 0
if (end <= start) {
return ''
}
if (!encoding) encoding = 'utf8'
while (true) {
switch (encoding) {
case 'hex':
return hexSlice(this, start, end)
case 'utf8':
case 'utf-8':
return utf8Slice(this, start, end)
case 'ascii':
return asciiSlice(this, start, end)
case 'latin1':
case 'binary':
return latin1Slice(this, start, end)
case 'base64':
return base64Slice(this, start, end)
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return utf16leSlice(this, start, end)
default:
if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
encoding = (encoding + '').toLowerCase()
loweredCase = true
}
}
}
// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
// reliably in a browserify context because there could be multiple different
// copies of the 'buffer' package in use. This method works even for Buffer
// instances that were created from another copy of the `buffer` package.
// See: https://github.com/feross/buffer/issues/154
Buffer.prototype._isBuffer = true
function swap (b, n, m) {
var i = b[n]
b[n] = b[m]
b[m] = i
}
Buffer.prototype.swap16 = function swap16 () {
var len = this.length
if (len % 2 !== 0) {
throw new RangeError('Buffer size must be a multiple of 16-bits')
}
for (var i = 0; i < len; i += 2) {
swap(this, i, i + 1)
}
return this
}
Buffer.prototype.swap32 = function swap32 () {
var len = this.length
if (len % 4 !== 0) {
throw new RangeError('Buffer size must be a multiple of 32-bits')
}
for (var i = 0; i < len; i += 4) {
swap(this, i, i + 3)
swap(this, i + 1, i + 2)
}
return this
}
Buffer.prototype.swap64 = function swap64 () {
var len = this.length
if (len % 8 !== 0) {
throw new RangeError('Buffer size must be a multiple of 64-bits')
}
for (var i = 0; i < len; i += 8) {
swap(this, i, i + 7)
swap(this, i + 1, i + 6)
swap(this, i + 2, i + 5)
swap(this, i + 3, i + 4)
}
return this
}
Buffer.prototype.toString = function toString () {
var length = this.length
if (length === 0) return ''
if (arguments.length === 0) return utf8Slice(this, 0, length)
return slowToString.apply(this, arguments)
}
Buffer.prototype.toLocaleString = Buffer.prototype.toString
Buffer.prototype.equals = function equals (b) {
if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
if (this === b) return true
return Buffer.compare(this, b) === 0
}
Buffer.prototype.inspect = function inspect () {
var str = ''
var max = exports.INSPECT_MAX_BYTES
str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
if (this.length > max) str += ' ... '
return '<Buffer ' + str + '>'
}
Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
if (isInstance(target, Uint8Array)) {
target = Buffer.from(target, target.offset, target.byteLength)
}
if (!Buffer.isBuffer(target)) {
throw new TypeError(
'The "target" argument must be one of type Buffer or Uint8Array. ' +
'Received type ' + (typeof target)
)
}
if (start === undefined) {
start = 0
}
if (end === undefined) {
end = target ? target.length : 0
}
if (thisStart === undefined) {
thisStart = 0
}
if (thisEnd === undefined) {
thisEnd = this.length
}
if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
throw new RangeError('out of range index')
}
if (thisStart >= thisEnd && start >= end) {
return 0
}
if (thisStart >= thisEnd) {
return -1
}
if (start >= end) {
return 1
}
start >>>= 0
end >>>= 0
thisStart >>>= 0
thisEnd >>>= 0
if (this === target) return 0
var x = thisEnd - thisStart
var y = end - start
var len = Math.min(x, y)
var thisCopy = this.slice(thisStart, thisEnd)
var targetCopy = target.slice(start, end)
for (var i = 0; i < len; ++i) {
if (thisCopy[i] !== targetCopy[i]) {
x = thisCopy[i]
y = targetCopy[i]
break
}
}
if (x < y) return -1
if (y < x) return 1
return 0
}
// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
// Empty buffer means no match
if (buffer.length === 0) return -1
// Normalize byteOffset
if (typeof byteOffset === 'string') {
encoding = byteOffset
byteOffset = 0
} else if (byteOffset > 0x7fffffff) {
byteOffset = 0x7fffffff
} else if (byteOffset < -0x80000000) {
byteOffset = -0x80000000
}
byteOffset = +byteOffset // Coerce to Number.
if (numberIsNaN(byteOffset)) {
// byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
byteOffset = dir ? 0 : (buffer.length - 1)
}
// Normalize byteOffset: negative offsets start from the end of the buffer
if (byteOffset < 0) byteOffset = buffer.length + byteOffset
if (byteOffset >= buffer.length) {
if (dir) return -1
else byteOffset = buffer.length - 1
} else if (byteOffset < 0) {
if (dir) byteOffset = 0
else return -1
}
// Normalize val
if (typeof val === 'string') {
val = Buffer.from(val, encoding)
}
// Finally, search either indexOf (if dir is true) or lastIndexOf
if (Buffer.isBuffer(val)) {
// Special case: looking for empty string/buffer always fails
if (val.length === 0) {
return -1
}
return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
} else if (typeof val === 'number') {
val = val & 0xFF // Search for a byte value [0-255]
if (typeof Uint8Array.prototype.indexOf === 'function') {
if (dir) {
return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
} else {
return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
}
}
return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
}
throw new TypeError('val must be string, number or Buffer')
}
function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
var indexSize = 1
var arrLength = arr.length
var valLength = val.length
if (encoding !== undefined) {
encoding = String(encoding).toLowerCase()
if (encoding === 'ucs2' || encoding === 'ucs-2' ||
encoding === 'utf16le' || encoding === 'utf-16le') {
if (arr.length < 2 || val.length < 2) {
return -1
}
indexSize = 2
arrLength /= 2
valLength /= 2
byteOffset /= 2
}
}
function read (buf, i) {
if (indexSize === 1) {
return buf[i]
} else {
return buf.readUInt16BE(i * indexSize)
}
}
var i
if (dir) {
var foundIndex = -1
for (i = byteOffset; i < arrLength; i++) {
if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
if (foundIndex === -1) foundIndex = i
if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
} else {
if (foundIndex !== -1) i -= i - foundIndex
foundIndex = -1
}
}
} else {
if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
for (i = byteOffset; i >= 0; i--) {
var found = true
for (var j = 0; j < valLength; j++) {
if (read(arr, i + j) !== read(val, j)) {
found = false
break
}
}
if (found) return i
}
}
return -1
}
Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
return this.indexOf(val, byteOffset, encoding) !== -1
}
Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
}
Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
}
function hexWrite (buf, string, offset, length) {
offset = Number(offset) || 0
var remaining = buf.length - offset
if (!length) {
length = remaining
} else {
length = Number(length)
if (length > remaining) {
length = remaining
}
}
var strLen = string.length
if (length > strLen / 2) {
length = strLen / 2
}
for (var i = 0; i < length; ++i) {
var parsed = parseInt(string.substr(i * 2, 2), 16)
if (numberIsNaN(parsed)) return i
buf[offset + i] = parsed
}
return i
}
function utf8Write (buf, string, offset, length) {
return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}
function asciiWrite (buf, string, offset, length) {
return blitBuffer(asciiToBytes(string), buf, offset, length)
}
function latin1Write (buf, string, offset, length) {
return asciiWrite(buf, string, offset, length)
}
function base64Write (buf, string, offset, length) {
return blitBuffer(base64ToBytes(string), buf, offset, length)
}
function ucs2Write (buf, string, offset, length) {
return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}
Buffer.prototype.write = function write (string, offset, length, encoding) {
// Buffer#write(string)
if (offset === undefined) {
encoding = 'utf8'
length = this.length
offset = 0
// Buffer#write(string, encoding)
} else if (length === undefined && typeof offset === 'string') {
encoding = offset
length = this.length
offset = 0
// Buffer#write(string, offset[, length][, encoding])
} else if (isFinite(offset)) {
offset = offset >>> 0
if (isFinite(length)) {
length = length >>> 0
if (encoding === undefined) encoding = 'utf8'
} else {
encoding = length
length = undefined
}
} else {
throw new Error(
'Buffer.write(string, encoding, offset[, length]) is no longer supported'
)
}
var remaining = this.length - offset
if (length === undefined || length > remaining) length = remaining
if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
throw new RangeError('Attempt to write outside buffer bounds')
}
if (!encoding) encoding = 'utf8'
var loweredCase = false
for (;;) {
switch (encoding) {
case 'hex':
return hexWrite(this, string, offset, length)
case 'utf8':
case 'utf-8':
return utf8Write(this, string, offset, length)
case 'ascii':
return asciiWrite(this, string, offset, length)
case 'latin1':
case 'binary':
return latin1Write(this, string, offset, length)
case 'base64':
// Warning: maxLength not taken into account in base64Write
return base64Write(this, string, offset, length)
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return ucs2Write(this, string, offset, length)
default:
if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
encoding = ('' + encoding).toLowerCase()
loweredCase = true
}
}
}
Buffer.prototype.toJSON = function toJSON () {
return {
type: 'Buffer',
data: Array.prototype.slice.call(this._arr || this, 0)
}
}
function base64Slice (buf, start, end) {
if (start === 0 && end === buf.length) {
return base64.fromByteArray(buf)
} else {
return base64.fromByteArray(buf.slice(start, end))
}
}
function utf8Slice (buf, start, end) {
end = Math.min(buf.length, end)
var res = []
var i = start
while (i < end) {
var firstByte = buf[i]
var codePoint = null
var bytesPerSequence = (firstByte > 0xEF) ? 4
: (firstByte > 0xDF) ? 3
: (firstByte > 0xBF) ? 2
: 1
if (i + bytesPerSequence <= end) {
var secondByte, thirdByte, fourthByte, tempCodePoint
switch (bytesPerSequence) {
case 1:
if (firstByte < 0x80) {
codePoint = firstByte
}
break
case 2:
secondByte = buf[i + 1]
if ((secondByte & 0xC0) === 0x80) {
tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
if (tempCodePoint > 0x7F) {
codePoint = tempCodePoint
}
}
break
case 3:
secondByte = buf[i + 1]
thirdByte = buf[i + 2]
if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
codePoint = tempCodePoint
}
}
break
case 4:
secondByte = buf[i + 1]
thirdByte = buf[i + 2]
fourthByte = buf[i + 3]
if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
codePoint = tempCodePoint
}
}
}
}
if (codePoint === null) {
// we did not generate a valid codePoint so insert a
// replacement char (U+FFFD) and advance only 1 byte
codePoint = 0xFFFD
bytesPerSequence = 1
} else if (codePoint > 0xFFFF) {
// encode to utf16 (surrogate pair dance)
codePoint -= 0x10000
res.push(codePoint >>> 10 & 0x3FF | 0xD800)
codePoint = 0xDC00 | codePoint & 0x3FF
}
res.push(codePoint)
i += bytesPerSequence
}
return decodeCodePointsArray(res)
}
// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000
function decodeCodePointsArray (codePoints) {
var len = codePoints.length
if (len <= MAX_ARGUMENTS_LENGTH) {
return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
}
// Decode in chunks to avoid "call stack size exceeded".
var res = ''
var i = 0
while (i < len) {
res += String.fromCharCode.apply(
String,
codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
)
}
return res
}
function asciiSlice (buf, start, end) {
var ret = ''
end = Math.min(buf.length, end)
for (var i = start; i < end; ++i) {
ret += String.fromCharCode(buf[i] & 0x7F)
}
return ret
}
function latin1Slice (buf, start, end) {
var ret = ''
end = Math.min(buf.length, end)
for (var i = start; i < end; ++i) {
ret += String.fromCharCode(buf[i])
}
return ret
}
function hexSlice (buf, start, end) {
var len = buf.length
if (!start || start < 0) start = 0
if (!end || end < 0 || end > len) end = len
var out = ''
for (var i = start; i < end; ++i) {
out += toHex(buf[i])
}
return out
}
function utf16leSlice (buf, start, end) {
var bytes = buf.slice(start, end)
var res = ''
for (var i = 0; i < bytes.length; i += 2) {
res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
}
return res
}
Buffer.prototype.slice = function slice (start, end) {
var len = this.length
start = ~~start
end = end === undefined ? len : ~~end
if (start < 0) {
start += len
if (start < 0) start = 0
} else if (start > len) {
start = len
}
if (end < 0) {
end += len
if (end < 0) end = 0
} else if (end > len) {
end = len
}
if (end < start) end = start
var newBuf = this.subarray(start, end)
// Return an augmented `Uint8Array` instance
newBuf.__proto__ = Buffer.prototype
return newBuf
}
/*
* Need to make sure that buffer isn't trying to write out of bounds.
*/
function checkOffset (offset, ext, length) {
if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}
Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) checkOffset(offset, byteLength, this.length)
var val = this[offset]
var mul = 1
var i = 0
while (++i < byteLength && (mul *= 0x100)) {
val += this[offset + i] * mul
}
return val
}
Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) {
checkOffset(offset, byteLength, this.length)
}
var val = this[offset + --byteLength]
var mul = 1
while (byteLength > 0 && (mul *= 0x100)) {
val += this[offset + --byteLength] * mul
}
return val
}
Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 1, this.length)
return this[offset]
}
Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 2, this.length)
return this[offset] | (this[offset + 1] << 8)
}
Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 2, this.length)
return (this[offset] << 8) | this[offset + 1]
}
Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)
return ((this[offset]) |
(this[offset + 1] << 8) |
(this[offset + 2] << 16)) +
(this[offset + 3] * 0x1000000)
}
Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)
return (this[offset] * 0x1000000) +
((this[offset + 1] << 16) |
(this[offset + 2] << 8) |
this[offset + 3])
}
Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) checkOffset(offset, byteLength, this.length)
var val = this[offset]
var mul = 1
var i = 0
while (++i < byteLength && (mul *= 0x100)) {
val += this[offset + i] * mul
}
mul *= 0x80
if (val >= mul) val -= Math.pow(2, 8 * byteLength)
return val
}
Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) checkOffset(offset, byteLength, this.length)
var i = byteLength
var mul = 1
var val = this[offset + --i]
while (i > 0 && (mul *= 0x100)) {
val += this[offset + --i] * mul
}
mul *= 0x80
if (val >= mul) val -= Math.pow(2, 8 * byteLength)
return val
}
Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 1, this.length)
if (!(this[offset] & 0x80)) return (this[offset])
return ((0xff - this[offset] + 1) * -1)
}
Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 2, this.length)
var val = this[offset] | (this[offset + 1] << 8)
return (val & 0x8000) ? val | 0xFFFF0000 : val
}
Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 2, this.length)
var val = this[offset + 1] | (this[offset] << 8)
return (val & 0x8000) ? val | 0xFFFF0000 : val
}
Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)
return (this[offset]) |
(this[offset + 1] << 8) |
(this[offset + 2] << 16) |
(this[offset + 3] << 24)
}
Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)
return (this[offset] << 24) |
(this[offset + 1] << 16) |
(this[offset + 2] << 8) |
(this[offset + 3])
}
Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)
return ieee754.read(this, offset, true, 23, 4)
}
Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 4, this.length)
return ieee754.read(this, offset, false, 23, 4)
}
Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 8, this.length)
return ieee754.read(this, offset, true, 52, 8)
}
Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
offset = offset >>> 0
if (!noAssert) checkOffset(offset, 8, this.length)
return ieee754.read(this, offset, false, 52, 8)
}
function checkInt (buf, value, offset, ext, max, min) {
if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
if (offset + ext > buf.length) throw new RangeError('Index out of range')
}
Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
value = +value
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) {
var maxBytes = Math.pow(2, 8 * byteLength) - 1
checkInt(this, value, offset, byteLength, maxBytes, 0)
}
var mul = 1
var i = 0
this[offset] = value & 0xFF
while (++i < byteLength && (mul *= 0x100)) {
this[offset + i] = (value / mul) & 0xFF
}
return offset + byteLength
}
Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
value = +value
offset = offset >>> 0
byteLength = byteLength >>> 0
if (!noAssert) {
var maxBytes = Math.pow(2, 8 * byteLength) - 1
checkInt(this, value, offset, byteLength, maxBytes, 0)
}
var i = byteLength - 1
var mul = 1
this[offset + i] = value & 0xFF
while (--i >= 0 && (mul *= 0x100)) {
this[offset + i] = (value / mul) & 0xFF
}
return offset + byteLength
}
Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
this[offset] = (value & 0xff)
return offset + 1
}
Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
this[offset] = (value & 0xff)
this[offset + 1] = (value >>> 8)
return offset + 2
}
Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
this[offset] = (value >>> 8)
this[offset + 1] = (value & 0xff)
return offset + 2
}
Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
this[offset + 3] = (value >>> 24)
this[offset + 2] = (value >>> 16)
this[offset + 1] = (value >>> 8)
this[offset] = (value & 0xff)
return offset + 4
}
Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
this[offset] = (value >>> 24)
this[offset + 1] = (value >>> 16)
this[offset + 2] = (value >>> 8)
this[offset + 3] = (value & 0xff)
return offset + 4
}
Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) {
var limit = Math.pow(2, (8 * byteLength) - 1)
checkInt(this, value, offset, byteLength, limit - 1, -limit)
}
var i = 0
var mul = 1
var sub = 0
this[offset] = value & 0xFF
while (++i < byteLength && (mul *= 0x100)) {
if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
sub = 1
}
this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
}
return offset + byteLength
}
Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) {
var limit = Math.pow(2, (8 * byteLength) - 1)
checkInt(this, value, offset, byteLength, limit - 1, -limit)
}
var i = byteLength - 1
var mul = 1
var sub = 0
this[offset + i] = value & 0xFF
while (--i >= 0 && (mul *= 0x100)) {
if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
sub = 1
}
this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
}
return offset + byteLength
}
Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
if (value < 0) value = 0xff + value + 1
this[offset] = (value & 0xff)
return offset + 1
}
Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
this[offset] = (value & 0xff)
this[offset + 1] = (value >>> 8)
return offset + 2
}
Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
this[offset] = (value >>> 8)
this[offset + 1] = (value & 0xff)
return offset + 2
}
Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
this[offset] = (value & 0xff)
this[offset + 1] = (value >>> 8)
this[offset + 2] = (value >>> 16)
this[offset + 3] = (value >>> 24)
return offset + 4
}
Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
if (value < 0) value = 0xffffffff + value + 1
this[offset] = (value >>> 24)
this[offset + 1] = (value >>> 16)
this[offset + 2] = (value >>> 8)
this[offset + 3] = (value & 0xff)
return offset + 4
}
function checkIEEE754 (buf, value, offset, ext, max, min) {
if (offset + ext > buf.length) throw new RangeError('Index out of range')
if (offset < 0) throw new RangeError('Index out of range')
}
function writeFloat (buf, value, offset, littleEndian, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) {
checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
}
ieee754.write(buf, value, offset, littleEndian, 23, 4)
return offset + 4
}
Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
return writeFloat(this, value, offset, true, noAssert)
}
Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
return writeFloat(this, value, offset, false, noAssert)
}
function writeDouble (buf, value, offset, littleEndian, noAssert) {
value = +value
offset = offset >>> 0
if (!noAssert) {
checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
}
ieee754.write(buf, value, offset, littleEndian, 52, 8)
return offset + 8
}
Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
return writeDouble(this, value, offset, true, noAssert)
}
Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
return writeDouble(this, value, offset, false, noAssert)
}
// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy (target, targetStart, start, end) {
if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
if (!start) start = 0
if (!end && end !== 0) end = this.length
if (targetStart >= target.length) targetStart = target.length
if (!targetStart) targetStart = 0
if (end > 0 && end < start) end = start
// Copy 0 bytes; we're done
if (end === start) return 0
if (target.length === 0 || this.length === 0) return 0
// Fatal error conditions
if (targetStart < 0) {
throw new RangeError('targetStart out of bounds')
}
if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
if (end < 0) throw new RangeError('sourceEnd out of bounds')
// Are we oob?
if (end > this.length) end = this.length
if (target.length - targetStart < end - start) {
end = target.length - targetStart + start
}
var len = end - start
if (this === target && typeof Uint8Array.prototype.copyWithin === 'function') {
// Use built-in when available, missing from IE11
this.copyWithin(targetStart, start, end)
} else if (this === target && start < targetStart && targetStart < end) {
// descending copy from end
for (var i = len - 1; i >= 0; --i) {
target[i + targetStart] = this[i + start]
}
} else {
Uint8Array.prototype.set.call(
target,
this.subarray(start, end),
targetStart
)
}
return len
}
// Usage:
// buffer.fill(number[, offset[, end]])
// buffer.fill(buffer[, offset[, end]])
// buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill (val, start, end, encoding) {
// Handle string cases:
if (typeof val === 'string') {
if (typeof start === 'string') {
encoding = start
start = 0
end = this.length
} else if (typeof end === 'string') {
encoding = end
end = this.length
}
if (encoding !== undefined && typeof encoding !== 'string') {
throw new TypeError('encoding must be a string')
}
if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
throw new TypeError('Unknown encoding: ' + encoding)
}
if (val.length === 1) {
var code = val.charCodeAt(0)
if ((encoding === 'utf8' && code < 128) ||
encoding === 'latin1') {
// Fast path: If `val` fits into a single byte, use that numeric value.
val = code
}
}
} else if (typeof val === 'number') {
val = val & 255
}
// Invalid ranges are not set to a default, so can range check early.
if (start < 0 || this.length < start || this.length < end) {
throw new RangeError('Out of range index')
}
if (end <= start) {
return this
}
start = start >>> 0
end = end === undefined ? this.length : end >>> 0
if (!val) val = 0
var i
if (typeof val === 'number') {
for (i = start; i < end; ++i) {
this[i] = val
}
} else {
var bytes = Buffer.isBuffer(val)
? val
: Buffer.from(val, encoding)
var len = bytes.length
if (len === 0) {
throw new TypeError('The value "' + val +
'" is invalid for argument "value"')
}
for (i = 0; i < end - start; ++i) {
this[i + start] = bytes[i % len]
}
}
return this
}
// HELPER FUNCTIONS
// ================
var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g
function base64clean (str) {
// Node takes equal signs as end of the Base64 encoding
str = str.split('=')[0]
// Node strips out invalid characters like \n and \t from the string, base64-js does not
str = str.trim().replace(INVALID_BASE64_RE, '')
// Node converts strings with length < 2 to ''
if (str.length < 2) return ''
// Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
while (str.length % 4 !== 0) {
str = str + '='
}
return str
}
function toHex (n) {
if (n < 16) return '0' + n.toString(16)
return n.toString(16)
}
function utf8ToBytes (string, units) {
units = units || Infinity
var codePoint
var length = string.length
var leadSurrogate = null
var bytes = []
for (var i = 0; i < length; ++i) {
codePoint = string.charCodeAt(i)
// is surrogate component
if (codePoint > 0xD7FF && codePoint < 0xE000) {
// last char was a lead
if (!leadSurrogate) {
// no lead yet
if (codePoint > 0xDBFF) {
// unexpected trail
if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
continue
} else if (i + 1 === length) {
// unpaired lead
if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
continue
}
// valid lead
leadSurrogate = codePoint
continue
}
// 2 leads in a row
if (codePoint < 0xDC00) {
if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
leadSurrogate = codePoint
continue
}
// valid surrogate pair
codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
} else if (leadSurrogate) {
// valid bmp char, but last char was a lead
if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
}
leadSurrogate = null
// encode utf8
if (codePoint < 0x80) {
if ((units -= 1) < 0) break
bytes.push(codePoint)
} else if (codePoint < 0x800) {
if ((units -= 2) < 0) break
bytes.push(
codePoint >> 0x6 | 0xC0,
codePoint & 0x3F | 0x80
)
} else if (codePoint < 0x10000) {
if ((units -= 3) < 0) break
bytes.push(
codePoint >> 0xC | 0xE0,
codePoint >> 0x6 & 0x3F | 0x80,
codePoint & 0x3F | 0x80
)
} else if (codePoint < 0x110000) {
if ((units -= 4) < 0) break
bytes.push(
codePoint >> 0x12 | 0xF0,
codePoint >> 0xC & 0x3F | 0x80,
codePoint >> 0x6 & 0x3F | 0x80,
codePoint & 0x3F | 0x80
)
} else {
throw new Error('Invalid code point')
}
}
return bytes
}
function asciiToBytes (str) {
var byteArray = []
for (var i = 0; i < str.length; ++i) {
// Node's code seems to be doing this and not & 0x7F..
byteArray.push(str.charCodeAt(i) & 0xFF)
}
return byteArray
}
function utf16leToBytes (str, units) {
var c, hi, lo
var byteArray = []
for (var i = 0; i < str.length; ++i) {
if ((units -= 2) < 0) break
c = str.charCodeAt(i)
hi = c >> 8
lo = c % 256
byteArray.push(lo)
byteArray.push(hi)
}
return byteArray
}
function base64ToBytes (str) {
return base64.toByteArray(base64clean(str))
}
function blitBuffer (src, dst, offset, length) {
for (var i = 0; i < length; ++i) {
if ((i + offset >= dst.length) || (i >= src.length)) break
dst[i + offset] = src[i]
}
return i
}
// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
// the `instanceof` check but they should be treated as of that type.
// See: https://github.com/feross/buffer/issues/166
function isInstance (obj, type) {
return obj instanceof type ||
(obj != null && obj.constructor != null && obj.constructor.name != null &&
obj.constructor.name === type.name)
}
function numberIsNaN (obj) {
// For IE11 support
return obj !== obj // eslint-disable-line no-self-compare
}
}).call(this,require("buffer").Buffer)
},{"base64-js":6,"buffer":8,"ieee754":12}],9:[function(require,module,exports){
(function (Buffer){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.
function isArray(arg) {
if (Array.isArray) {
return Array.isArray(arg);
}
return objectToString(arg) === '[object Array]';
}
exports.isArray = isArray;
function isBoolean(arg) {
return typeof arg === 'boolean';
}
exports.isBoolean = isBoolean;
function isNull(arg) {
return arg === null;
}
exports.isNull = isNull;
function isNullOrUndefined(arg) {
return arg == null;
}
exports.isNullOrUndefined = isNullOrUndefined;
function isNumber(arg) {
return typeof arg === 'number';
}
exports.isNumber = isNumber;
function isString(arg) {
return typeof arg === 'string';
}
exports.isString = isString;
function isSymbol(arg) {
return typeof arg === 'symbol';
}
exports.isSymbol = isSymbol;
function isUndefined(arg) {
return arg === void 0;
}
exports.isUndefined = isUndefined;
function isRegExp(re) {
return objectToString(re) === '[object RegExp]';
}
exports.isRegExp = isRegExp;
function isObject(arg) {
return typeof arg === 'object' && arg !== null;
}
exports.isObject = isObject;
function isDate(d) {
return objectToString(d) === '[object Date]';
}
exports.isDate = isDate;
function isError(e) {
return (objectToString(e) === '[object Error]' || e instanceof Error);
}
exports.isError = isError;
function isFunction(arg) {
return typeof arg === 'function';
}
exports.isFunction = isFunction;
function isPrimitive(arg) {
return arg === null ||
typeof arg === 'boolean' ||
typeof arg === 'number' ||
typeof arg === 'string' ||
typeof arg === 'symbol' || // ES6 symbol
typeof arg === 'undefined';
}
exports.isPrimitive = isPrimitive;
exports.isBuffer = Buffer.isBuffer;
function objectToString(o) {
return Object.prototype.toString.call(o);
}
}).call(this,{"isBuffer":require("../../is-buffer/index.js")})
},{"../../is-buffer/index.js":14}],10:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
var objectCreate = Object.create || objectCreatePolyfill
var objectKeys = Object.keys || objectKeysPolyfill
var bind = Function.prototype.bind || functionBindPolyfill
function EventEmitter() {
if (!this._events || !Object.prototype.hasOwnProperty.call(this, '_events')) {
this._events = objectCreate(null);
this._eventsCount = 0;
}
this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;
// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;
EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;
// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
var defaultMaxListeners = 10;
var hasDefineProperty;
try {
var o = {};
if (Object.defineProperty) Object.defineProperty(o, 'x', { value: 0 });
hasDefineProperty = o.x === 0;
} catch (err) { hasDefineProperty = false }
if (hasDefineProperty) {
Object.defineProperty(EventEmitter, 'defaultMaxListeners', {
enumerable: true,
get: function() {
return defaultMaxListeners;
},
set: function(arg) {
// check whether the input is a positive number (whose value is zero or
// greater and not a NaN).
if (typeof arg !== 'number' || arg < 0 || arg !== arg)
throw new TypeError('"defaultMaxListeners" must be a positive number');
defaultMaxListeners = arg;
}
});
} else {
EventEmitter.defaultMaxListeners = defaultMaxListeners;
}
// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
if (typeof n !== 'number' || n < 0 || isNaN(n))
throw new TypeError('"n" argument must be a positive number');
this._maxListeners = n;
return this;
};
function $getMaxListeners(that) {
if (that._maxListeners === undefined)
return EventEmitter.defaultMaxListeners;
return that._maxListeners;
}
EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
return $getMaxListeners(this);
};
// These standalone emit* functions are used to optimize calling of event
// handlers for fast cases because emit() itself often has a variable number of
// arguments and can be deoptimized because of that. These functions always have
// the same number of arguments and thus do not get deoptimized, so the code
// inside them can execute faster.
function emitNone(handler, isFn, self) {
if (isFn)
handler.call(self);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self);
}
}
function emitOne(handler, isFn, self, arg1) {
if (isFn)
handler.call(self, arg1);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self, arg1);
}
}
function emitTwo(handler, isFn, self, arg1, arg2) {
if (isFn)
handler.call(self, arg1, arg2);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self, arg1, arg2);
}
}
function emitThree(handler, isFn, self, arg1, arg2, arg3) {
if (isFn)
handler.call(self, arg1, arg2, arg3);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].call(self, arg1, arg2, arg3);
}
}
function emitMany(handler, isFn, self, args) {
if (isFn)
handler.apply(self, args);
else {
var len = handler.length;
var listeners = arrayClone(handler, len);
for (var i = 0; i < len; ++i)
listeners[i].apply(self, args);
}
}
EventEmitter.prototype.emit = function emit(type) {
var er, handler, len, args, i, events;
var doError = (type === 'error');
events = this._events;
if (events)
doError = (doError && events.error == null);
else if (!doError)
return false;
// If there is no 'error' event listener then throw.
if (doError) {
if (arguments.length > 1)
er = arguments[1];
if (er instanceof Error) {
throw er; // Unhandled 'error' event
} else {
// At least give some kind of context to the user
var err = new Error('Unhandled "error" event. (' + er + ')');
err.context = er;
throw err;
}
return false;
}
handler = events[type];
if (!handler)
return false;
var isFn = typeof handler === 'function';
len = arguments.length;
switch (len) {
// fast cases
case 1:
emitNone(handler, isFn, this);
break;
case 2:
emitOne(handler, isFn, this, arguments[1]);
break;
case 3:
emitTwo(handler, isFn, this, arguments[1], arguments[2]);
break;
case 4:
emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
break;
// slower
default:
args = new Array(len - 1);
for (i = 1; i < len; i++)
args[i - 1] = arguments[i];
emitMany(handler, isFn, this, args);
}
return true;
};
function _addListener(target, type, listener, prepend) {
var m;
var events;
var existing;
if (typeof listener !== 'function')
throw new TypeError('"listener" argument must be a function');
events = target._events;
if (!events) {
events = target._events = objectCreate(null);
target._eventsCount = 0;
} else {
// To avoid recursion in the case that type === "newListener"! Before
// adding it to the listeners, first emit "newListener".
if (events.newListener) {
target.emit('newListener', type,
listener.listener ? listener.listener : listener);
// Re-assign `events` because a newListener handler could have caused the
// this._events to be assigned to a new object
events = target._events;
}
existing = events[type];
}
if (!existing) {
// Optimize the case of one listener. Don't need the extra array object.
existing = events[type] = listener;
++target._eventsCount;
} else {
if (typeof existing === 'function') {
// Adding the second element, need to change to array.
existing = events[type] =
prepend ? [listener, existing] : [existing, listener];
} else {
// If we've already got an array, just append.
if (prepend) {
existing.unshift(listener);
} else {
existing.push(listener);
}
}
// Check for listener leak
if (!existing.warned) {
m = $getMaxListeners(target);
if (m && m > 0 && existing.length > m) {
existing.warned = true;
var w = new Error('Possible EventEmitter memory leak detected. ' +
existing.length + ' "' + String(type) + '" listeners ' +
'added. Use emitter.setMaxListeners() to ' +
'increase limit.');
w.name = 'MaxListenersExceededWarning';
w.emitter = target;
w.type = type;
w.count = existing.length;
if (typeof console === 'object' && console.warn) {
console.warn('%s: %s', w.name, w.message);
}
}
}
}
return target;
}
EventEmitter.prototype.addListener = function addListener(type, listener) {
return _addListener(this, type, listener, false);
};
EventEmitter.prototype.on = EventEmitter.prototype.addListener;
EventEmitter.prototype.prependListener =
function prependListener(type, listener) {
return _addListener(this, type, listener, true);
};
function onceWrapper() {
if (!this.fired) {
this.target.removeListener(this.type, this.wrapFn);
this.fired = true;
switch (arguments.length) {
case 0:
return this.listener.call(this.target);
case 1:
return this.listener.call(this.target, arguments[0]);
case 2:
return this.listener.call(this.target, arguments[0], arguments[1]);
case 3:
return this.listener.call(this.target, arguments[0], arguments[1],
arguments[2]);
default:
var args = new Array(arguments.length);
for (var i = 0; i < args.length; ++i)
args[i] = arguments[i];
this.listener.apply(this.target, args);
}
}
}
function _onceWrap(target, type, listener) {
var state = { fired: false, wrapFn: undefined, target: target, type: type, listener: listener };
var wrapped = bind.call(onceWrapper, state);
wrapped.listener = listener;
state.wrapFn = wrapped;
return wrapped;
}
EventEmitter.prototype.once = function once(type, listener) {
if (typeof listener !== 'function')
throw new TypeError('"listener" argument must be a function');
this.on(type, _onceWrap(this, type, listener));
return this;
};
EventEmitter.prototype.prependOnceListener =
function prependOnceListener(type, listener) {
if (typeof listener !== 'function')
throw new TypeError('"listener" argument must be a function');
this.prependListener(type, _onceWrap(this, type, listener));
return this;
};
// Emits a 'removeListener' event if and only if the listener was removed.
EventEmitter.prototype.removeListener =
function removeListener(type, listener) {
var list, events, position, i, originalListener;
if (typeof listener !== 'function')
throw new TypeError('"listener" argument must be a function');
events = this._events;
if (!events)
return this;
list = events[type];
if (!list)
return this;
if (list === listener || list.listener === listener) {
if (--this._eventsCount === 0)
this._events = objectCreate(null);
else {
delete events[type];
if (events.removeListener)
this.emit('removeListener', type, list.listener || listener);
}
} else if (typeof list !== 'function') {
position = -1;
for (i = list.length - 1; i >= 0; i--) {
if (list[i] === listener || list[i].listener === listener) {
originalListener = list[i].listener;
position = i;
break;
}
}
if (position < 0)
return this;
if (position === 0)
list.shift();
else
spliceOne(list, position);
if (list.length === 1)
events[type] = list[0];
if (events.removeListener)
this.emit('removeListener', type, originalListener || listener);
}
return this;
};
EventEmitter.prototype.removeAllListeners =
function removeAllListeners(type) {
var listeners, events, i;
events = this._events;
if (!events)
return this;
// not listening for removeListener, no need to emit
if (!events.removeListener) {
if (arguments.length === 0) {
this._events = objectCreate(null);
this._eventsCount = 0;
} else if (events[type]) {
if (--this._eventsCount === 0)
this._events = objectCreate(null);
else
delete events[type];
}
return this;
}
// emit removeListener for all listeners on all events
if (arguments.length === 0) {
var keys = objectKeys(events);
var key;
for (i = 0; i < keys.length; ++i) {
key = keys[i];
if (key === 'removeListener') continue;
this.removeAllListeners(key);
}
this.removeAllListeners('removeListener');
this._events = objectCreate(null);
this._eventsCount = 0;
return this;
}
listeners = events[type];
if (typeof listeners === 'function') {
this.removeListener(type, listeners);
} else if (listeners) {
// LIFO order
for (i = listeners.length - 1; i >= 0; i--) {
this.removeListener(type, listeners[i]);
}
}
return this;
};
function _listeners(target, type, unwrap) {
var events = target._events;
if (!events)
return [];
var evlistener = events[type];
if (!evlistener)
return [];
if (typeof evlistener === 'function')
return unwrap ? [evlistener.listener || evlistener] : [evlistener];
return unwrap ? unwrapListeners(evlistener) : arrayClone(evlistener, evlistener.length);
}
EventEmitter.prototype.listeners = function listeners(type) {
return _listeners(this, type, true);
};
EventEmitter.prototype.rawListeners = function rawListeners(type) {
return _listeners(this, type, false);
};
EventEmitter.listenerCount = function(emitter, type) {
if (typeof emitter.listenerCount === 'function') {
return emitter.listenerCount(type);
} else {
return listenerCount.call(emitter, type);
}
};
EventEmitter.prototype.listenerCount = listenerCount;
function listenerCount(type) {
var events = this._events;
if (events) {
var evlistener = events[type];
if (typeof evlistener === 'function') {
return 1;
} else if (evlistener) {
return evlistener.length;
}
}
return 0;
}
EventEmitter.prototype.eventNames = function eventNames() {
return this._eventsCount > 0 ? Reflect.ownKeys(this._events) : [];
};
// About 1.5x faster than the two-arg version of Array#splice().
function spliceOne(list, index) {
for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1)
list[i] = list[k];
list.pop();
}
function arrayClone(arr, n) {
var copy = new Array(n);
for (var i = 0; i < n; ++i)
copy[i] = arr[i];
return copy;
}
function unwrapListeners(arr) {
var ret = new Array(arr.length);
for (var i = 0; i < ret.length; ++i) {
ret[i] = arr[i].listener || arr[i];
}
return ret;
}
function objectCreatePolyfill(proto) {
var F = function() {};
F.prototype = proto;
return new F;
}
function objectKeysPolyfill(obj) {
var keys = [];
for (var k in obj) if (Object.prototype.hasOwnProperty.call(obj, k)) {
keys.push(k);
}
return k;
}
function functionBindPolyfill(context) {
var fn = this;
return function () {
return fn.apply(context, arguments);
};
}
},{}],11:[function(require,module,exports){
(function (process){
// very simple FIFO serial queue (plus callback wrapper), helps you call `fn`s in order
module.exports = function SerialQueue() {
var q = {},
tasks = [];
function runNext() {
tasks[0](function () {
tasks.shift(); // TODO: avoid?
if (tasks.length) runNext();
});
}
// usage: `q.aquire(function (release) { … release(); });`
q.acquire = function (fn) {
var len = tasks.push(fn);
if (len === 1) process.nextTick(runNext);
};
// usage: `cb = q.TRANSACTION_WRAPPER(cb, function () { … cb(); });`
// (pass `true` for `nested` if your own caller already holds lock)
q.TRANSACTION_WRAPPER = function (cb, proceed, nested) {
if (nested) return process.nextTick(proceed), cb;
var _releaseQueue;
if ('postAcquire' in this) proceed = this.postAcquire.bind(q, proceed);
q.acquire(function (releaseQueue) {
_releaseQueue = releaseQueue;
proceed();
});
var capturedCB, finish = ('preRelease' in this) ? this.preRelease.bind(q, _finish) : _finish;
function _finish() {
capturedCB();
_releaseQueue();
}
return function () {
capturedCB = Function.prototype.apply.bind(cb, this, arguments);
finish.call(null, Array.prototype.slice.call(arguments, 0), this);
};
};
return q;
};
}).call(this,require('_process'))
},{"_process":17}],12:[function(require,module,exports){
exports.read = function (buffer, offset, isLE, mLen, nBytes) {
var e, m
var eLen = (nBytes * 8) - mLen - 1
var eMax = (1 << eLen) - 1
var eBias = eMax >> 1
var nBits = -7
var i = isLE ? (nBytes - 1) : 0
var d = isLE ? -1 : 1
var s = buffer[offset + i]
i += d
e = s & ((1 << (-nBits)) - 1)
s >>= (-nBits)
nBits += eLen
for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}
m = e & ((1 << (-nBits)) - 1)
e >>= (-nBits)
nBits += mLen
for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}
if (e === 0) {
e = 1 - eBias
} else if (e === eMax) {
return m ? NaN : ((s ? -1 : 1) * Infinity)
} else {
m = m + Math.pow(2, mLen)
e = e - eBias
}
return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
}
exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
var e, m, c
var eLen = (nBytes * 8) - mLen - 1
var eMax = (1 << eLen) - 1
var eBias = eMax >> 1
var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
var i = isLE ? 0 : (nBytes - 1)
var d = isLE ? 1 : -1
var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0
value = Math.abs(value)
if (isNaN(value) || value === Infinity) {
m = isNaN(value) ? 1 : 0
e = eMax
} else {
e = Math.floor(Math.log(value) / Math.LN2)
if (value * (c = Math.pow(2, -e)) < 1) {
e--
c *= 2
}
if (e + eBias >= 1) {
value += rt / c
} else {
value += rt * Math.pow(2, 1 - eBias)
}
if (value * c >= 2) {
e++
c /= 2
}
if (e + eBias >= eMax) {
m = 0
e = eMax
} else if (e + eBias >= 1) {
m = ((value * c) - 1) * Math.pow(2, mLen)
e = e + eBias
} else {
m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
e = 0
}
}
for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
e = (e << mLen) | m
eLen += mLen
for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
buffer[offset + i - d] |= s * 128
}
},{}],13:[function(require,module,exports){
if (typeof Object.create === 'function') {
// implementation from standard node.js 'util' module
module.exports = function inherits(ctor, superCtor) {
if (superCtor) {
ctor.super_ = superCtor
ctor.prototype = Object.create(superCtor.prototype, {
constructor: {
value: ctor,
enumerable: false,
writable: true,
configurable: true
}
})
}
};
} else {
// old school shim for old browsers
module.exports = function inherits(ctor, superCtor) {
if (superCtor) {
ctor.super_ = superCtor
var TempCtor = function () {}
TempCtor.prototype = superCtor.prototype
ctor.prototype = new TempCtor()
ctor.prototype.constructor = ctor
}
}
}
},{}],14:[function(require,module,exports){
/*!
* Determine if an object is a Buffer
*
* @author Feross Aboukhadijeh <https://feross.org>
* @license MIT
*/
// The _isBuffer check is for Safari 5-7 support, because it's missing
// Object.prototype.constructor. Remove this eventually
module.exports = function (obj) {
return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
}
function isBuffer (obj) {
return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
}
// For Node v0.10 support. Remove this eventually.
function isSlowBuffer (obj) {
return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
}
},{}],15:[function(require,module,exports){
var toString = {}.toString;
module.exports = Array.isArray || function (arr) {
return toString.call(arr) == '[object Array]';
};
},{}],16:[function(require,module,exports){
(function (process){
'use strict';
if (typeof process === 'undefined' ||
!process.version ||
process.version.indexOf('v0.') === 0 ||
process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {
module.exports = { nextTick: nextTick };
} else {
module.exports = process
}
function nextTick(fn, arg1, arg2, arg3) {
if (typeof fn !== 'function') {
throw new TypeError('"callback" argument must be a function');
}
var len = arguments.length;
var args, i;
switch (len) {
case 0:
case 1:
return process.nextTick(fn);
case 2:
return process.nextTick(function afterTickOne() {
fn.call(null, arg1);
});
case 3:
return process.nextTick(function afterTickTwo() {
fn.call(null, arg1, arg2);
});
case 4:
return process.nextTick(function afterTickThree() {
fn.call(null, arg1, arg2, arg3);
});
default:
args = new Array(len - 1);
i = 0;
while (i < args.length) {
args[i++] = arguments[i];
}
return process.nextTick(function afterTick() {
fn.apply(null, args);
});
}
}
}).call(this,require('_process'))
},{"_process":17}],17:[function(require,module,exports){
// shim for using process in browser
var process = module.exports = {};
// cached from whatever global is present so that test runners that stub it
// don't break things. But we need to wrap it in a try catch in case it is
// wrapped in strict mode code which doesn't define any globals. It's inside a
// function because try/catches deoptimize in certain engines.
var cachedSetTimeout;
var cachedClearTimeout;
function defaultSetTimout() {
throw new Error('setTimeout has not been defined');
}
function defaultClearTimeout () {
throw new Error('clearTimeout has not been defined');
}
(function () {
try {
if (typeof setTimeout === 'function') {
cachedSetTimeout = setTimeout;
} else {
cachedSetTimeout = defaultSetTimout;
}
} catch (e) {
cachedSetTimeout = defaultSetTimout;
}
try {
if (typeof clearTimeout === 'function') {
cachedClearTimeout = clearTimeout;
} else {
cachedClearTimeout = defaultClearTimeout;
}
} catch (e) {
cachedClearTimeout = defaultClearTimeout;
}
} ())
function runTimeout(fun) {
if (cachedSetTimeout === setTimeout) {
//normal enviroments in sane situations
return setTimeout(fun, 0);
}
// if setTimeout wasn't available but was latter defined
if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
cachedSetTimeout = setTimeout;
return setTimeout(fun, 0);
}
try {
// when when somebody has screwed with setTimeout but no I.E. maddness
return cachedSetTimeout(fun, 0);
} catch(e){
try {
// When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
return cachedSetTimeout.call(null, fun, 0);
} catch(e){
// same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
return cachedSetTimeout.call(this, fun, 0);
}
}
}
function runClearTimeout(marker) {
if (cachedClearTimeout === clearTimeout) {
//normal enviroments in sane situations
return clearTimeout(marker);
}
// if clearTimeout wasn't available but was latter defined
if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
cachedClearTimeout = clearTimeout;
return clearTimeout(marker);
}
try {
// when when somebody has screwed with setTimeout but no I.E. maddness
return cachedClearTimeout(marker);
} catch (e){
try {
// When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
return cachedClearTimeout.call(null, marker);
} catch (e){
// same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
// Some versions of I.E. have different rules for clearTimeout vs setTimeout
return cachedClearTimeout.call(this, marker);
}
}
}
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;
function cleanUpNextTick() {
if (!draining || !currentQueue) {
return;
}
draining = false;
if (currentQueue.length) {
queue = currentQueue.concat(queue);
} else {
queueIndex = -1;
}
if (queue.length) {
drainQueue();
}
}
function drainQueue() {
if (draining) {
return;
}
var timeout = runTimeout(cleanUpNextTick);
draining = true;
var len = queue.length;
while(len) {
currentQueue = queue;
queue = [];
while (++queueIndex < len) {
if (currentQueue) {
currentQueue[queueIndex].run();
}
}
queueIndex = -1;
len = queue.length;
}
currentQueue = null;
draining = false;
runClearTimeout(timeout);
}
process.nextTick = function (fun) {
var args = new Array(arguments.length - 1);
if (arguments.length > 1) {
for (var i = 1; i < arguments.length; i++) {
args[i - 1] = arguments[i];
}
}
queue.push(new Item(fun, args));
if (queue.length === 1 && !draining) {
runTimeout(drainQueue);
}
};
// v8 likes predictible objects
function Item(fun, array) {
this.fun = fun;
this.array = array;
}
Item.prototype.run = function () {
this.fun.apply(null, this.array);
};
process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};
function noop() {}
process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;
process.prependListener = noop;
process.prependOnceListener = noop;
process.listeners = function (name) { return [] }
process.binding = function (name) {
throw new Error('process.binding is not supported');
};
process.cwd = function () { return '/' };
process.chdir = function (dir) {
throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };
},{}],18:[function(require,module,exports){
module.exports = require('./lib/_stream_duplex.js');
},{"./lib/_stream_duplex.js":19}],19:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// a duplex stream is just a stream that is both readable and writable.
// Since JS doesn't have multiple prototypal inheritance, this class
// prototypally inherits from Readable, and then parasitically from
// Writable.
'use strict';
/*<replacement>*/
var pna = require('process-nextick-args');
/*</replacement>*/
/*<replacement>*/
var objectKeys = Object.keys || function (obj) {
var keys = [];
for (var key in obj) {
keys.push(key);
}return keys;
};
/*</replacement>*/
module.exports = Duplex;
/*<replacement>*/
var util = Object.create(require('core-util-is'));
util.inherits = require('inherits');
/*</replacement>*/
var Readable = require('./_stream_readable');
var Writable = require('./_stream_writable');
util.inherits(Duplex, Readable);
{
// avoid scope creep, the keys array can then be collected
var keys = objectKeys(Writable.prototype);
for (var v = 0; v < keys.length; v++) {
var method = keys[v];
if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
}
}
function Duplex(options) {
if (!(this instanceof Duplex)) return new Duplex(options);
Readable.call(this, options);
Writable.call(this, options);
if (options && options.readable === false) this.readable = false;
if (options && options.writable === false) this.writable = false;
this.allowHalfOpen = true;
if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;
this.once('end', onend);
}
Object.defineProperty(Duplex.prototype, 'writableHighWaterMark', {
// making it explicit this property is not enumerable
// because otherwise some prototype manipulation in
// userland will fail
enumerable: false,
get: function () {
return this._writableState.highWaterMark;
}
});
// the no-half-open enforcer
function onend() {
// if we allow half-open state, or if the writable side ended,
// then we're ok.
if (this.allowHalfOpen || this._writableState.ended) return;
// no more data can be written.
// But allow more writes to happen in this tick.
pna.nextTick(onEndNT, this);
}
function onEndNT(self) {
self.end();
}
Object.defineProperty(Duplex.prototype, 'destroyed', {
get: function () {
if (this._readableState === undefined || this._writableState === undefined) {
return false;
}
return this._readableState.destroyed && this._writableState.destroyed;
},
set: function (value) {
// we ignore the value if the stream
// has not been initialized yet
if (this._readableState === undefined || this._writableState === undefined) {
return;
}
// backward compatibility, the user is explicitly
// managing destroyed
this._readableState.destroyed = value;
this._writableState.destroyed = value;
}
});
Duplex.prototype._destroy = function (err, cb) {
this.push(null);
this.end();
pna.nextTick(cb, err);
};
},{"./_stream_readable":21,"./_stream_writable":23,"core-util-is":9,"inherits":13,"process-nextick-args":16}],20:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// a passthrough stream.
// basically just the most minimal sort of Transform stream.
// Every written chunk gets output as-is.
'use strict';
module.exports = PassThrough;
var Transform = require('./_stream_transform');
/*<replacement>*/
var util = Object.create(require('core-util-is'));
util.inherits = require('inherits');
/*</replacement>*/
util.inherits(PassThrough, Transform);
function PassThrough(options) {
if (!(this instanceof PassThrough)) return new PassThrough(options);
Transform.call(this, options);
}
PassThrough.prototype._transform = function (chunk, encoding, cb) {
cb(null, chunk);
};
},{"./_stream_transform":22,"core-util-is":9,"inherits":13}],21:[function(require,module,exports){
(function (process,global){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';
/*<replacement>*/
var pna = require('process-nextick-args');
/*</replacement>*/
module.exports = Readable;
/*<replacement>*/
var isArray = require('isarray');
/*</replacement>*/
/*<replacement>*/
var Duplex;
/*</replacement>*/
Readable.ReadableState = ReadableState;
/*<replacement>*/
var EE = require('events').EventEmitter;
var EElistenerCount = function (emitter, type) {
return emitter.listeners(type).length;
};
/*</replacement>*/
/*<replacement>*/
var Stream = require('./internal/streams/stream');
/*</replacement>*/
/*<replacement>*/
var Buffer = require('safe-buffer').Buffer;
var OurUint8Array = global.Uint8Array || function () {};
function _uint8ArrayToBuffer(chunk) {
return Buffer.from(chunk);
}
function _isUint8Array(obj) {
return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
}
/*</replacement>*/
/*<replacement>*/
var util = Object.create(require('core-util-is'));
util.inherits = require('inherits');
/*</replacement>*/
/*<replacement>*/
var debugUtil = require('util');
var debug = void 0;
if (debugUtil && debugUtil.debuglog) {
debug = debugUtil.debuglog('stream');
} else {
debug = function () {};
}
/*</replacement>*/
var BufferList = require('./internal/streams/BufferList');
var destroyImpl = require('./internal/streams/destroy');
var StringDecoder;
util.inherits(Readable, Stream);
var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];
function prependListener(emitter, event, fn) {
// Sadly this is not cacheable as some libraries bundle their own
// event emitter implementation with them.
if (typeof emitter.prependListener === 'function') return emitter.prependListener(event, fn);
// This is a hack to make sure that our error handler is attached before any
// userland ones. NEVER DO THIS. This is here only because this code needs
// to continue to work with older versions of Node.js that do not include
// the prependListener() method. The goal is to eventually remove this hack.
if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
}
function ReadableState(options, stream) {
Duplex = Duplex || require('./_stream_duplex');
options = options || {};
// Duplex streams are both readable and writable, but share
// the same options object.
// However, some cases require setting options to different
// values for the readable and the writable sides of the duplex stream.
// These options can be provided separately as readableXXX and writableXXX.
var isDuplex = stream instanceof Duplex;
// object stream flag. Used to make read(n) ignore n and to
// make all the buffer merging and length checks go away
this.objectMode = !!options.objectMode;
if (isDuplex) this.objectMode = this.objectMode || !!options.readableObjectMode;
// the point at which it stops calling _read() to fill the buffer
// Note: 0 is a valid value, means "don't call _read preemptively ever"
var hwm = options.highWaterMark;
var readableHwm = options.readableHighWaterMark;
var defaultHwm = this.objectMode ? 16 : 16 * 1024;
if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (readableHwm || readableHwm === 0)) this.highWaterMark = readableHwm;else this.highWaterMark = defaultHwm;
// cast to ints.
this.highWaterMark = Math.floor(this.highWaterMark);
// A linked list is used to store data chunks instead of an array because the
// linked list can remove elements from the beginning faster than
// array.shift()
this.buffer = new BufferList();
this.length = 0;
this.pipes = null;
this.pipesCount = 0;
this.flowing = null;
this.ended = false;
this.endEmitted = false;
this.reading = false;
// a flag to be able to tell if the event 'readable'/'data' is emitted
// immediately, or on a later tick. We set this to true at first, because
// any actions that shouldn't happen until "later" should generally also
// not happen before the first read call.
this.sync = true;
// whenever we return null, then we set a flag to say
// that we're awaiting a 'readable' event emission.
this.needReadable = false;
this.emittedReadable = false;
this.readableListening = false;
this.resumeScheduled = false;
// has it been destroyed
this.destroyed = false;
// Crypto is kind of old and crusty. Historically, its default string
// encoding is 'binary' so we have to make this configurable.
// Everything else in the universe uses 'utf8', though.
this.defaultEncoding = options.defaultEncoding || 'utf8';
// the number of writers that are awaiting a drain event in .pipe()s
this.awaitDrain = 0;
// if true, a maybeReadMore has been scheduled
this.readingMore = false;
this.decoder = null;
this.encoding = null;
if (options.encoding) {
if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
this.decoder = new StringDecoder(options.encoding);
this.encoding = options.encoding;
}
}
function Readable(options) {
Duplex = Duplex || require('./_stream_duplex');
if (!(this instanceof Readable)) return new Readable(options);
this._readableState = new ReadableState(options, this);
// legacy
this.readable = true;
if (options) {
if (typeof options.read === 'function') this._read = options.read;
if (typeof options.destroy === 'function') this._destroy = options.destroy;
}
Stream.call(this);
}
Object.defineProperty(Readable.prototype, 'destroyed', {
get: function () {
if (this._readableState === undefined) {
return false;
}
return this._readableState.destroyed;
},
set: function (value) {
// we ignore the value if the stream
// has not been initialized yet
if (!this._readableState) {
return;
}
// backward compatibility, the user is explicitly
// managing destroyed
this._readableState.destroyed = value;
}
});
Readable.prototype.destroy = destroyImpl.destroy;
Readable.prototype._undestroy = destroyImpl.undestroy;
Readable.prototype._destroy = function (err, cb) {
this.push(null);
cb(err);
};
// Manually shove something into the read() buffer.
// This returns true if the highWaterMark has not been hit yet,
// similar to how Writable.write() returns true if you should
// write() some more.
Readable.prototype.push = function (chunk, encoding) {
var state = this._readableState;
var skipChunkCheck;
if (!state.objectMode) {
if (typeof chunk === 'string') {
encoding = encoding || state.defaultEncoding;
if (encoding !== state.encoding) {
chunk = Buffer.from(chunk, encoding);
encoding = '';
}
skipChunkCheck = true;
}
} else {
skipChunkCheck = true;
}
return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
};
// Unshift should *always* be something directly out of read()
Readable.prototype.unshift = function (chunk) {
return readableAddChunk(this, chunk, null, true, false);
};
function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
var state = stream._readableState;
if (chunk === null) {
state.reading = false;
onEofChunk(stream, state);
} else {
var er;
if (!skipChunkCheck) er = chunkInvalid(state, chunk);
if (er) {
stream.emit('error', er);
} else if (state.objectMode || chunk && chunk.length > 0) {
if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
chunk = _uint8ArrayToBuffer(chunk);
}
if (addToFront) {
if (state.endEmitted) stream.emit('error', new Error('stream.unshift() after end event'));else addChunk(stream, state, chunk, true);
} else if (state.ended) {
stream.emit('error', new Error('stream.push() after EOF'));
} else {
state.reading = false;
if (state.decoder && !encoding) {
chunk = state.decoder.write(chunk);
if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
} else {
addChunk(stream, state, chunk, false);
}
}
} else if (!addToFront) {
state.reading = false;
}
}
return needMoreData(state);
}
function addChunk(stream, state, chunk, addToFront) {
if (state.flowing && state.length === 0 && !state.sync) {
stream.emit('data', chunk);
stream.read(0);
} else {
// update the buffer info.
state.length += state.objectMode ? 1 : chunk.length;
if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);
if (state.needReadable) emitReadable(stream);
}
maybeReadMore(stream, state);
}
function chunkInvalid(state, chunk) {
var er;
if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
er = new TypeError('Invalid non-string/buffer chunk');
}
return er;
}
// if it's past the high water mark, we can push in some more.
// Also, if we have no data yet, we can stand some
// more bytes. This is to work around cases where hwm=0,
// such as the repl. Also, if the push() triggered a
// readable event, and the user called read(largeNumber) such that
// needReadable was set, then we ought to push more, so that another
// 'readable' event will be triggered.
function needMoreData(state) {
return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
}
Readable.prototype.isPaused = function () {
return this._readableState.flowing === false;
};
// backwards compatibility.
Readable.prototype.setEncoding = function (enc) {
if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
this._readableState.decoder = new StringDecoder(enc);
this._readableState.encoding = enc;
return this;
};
// Don't raise the hwm > 8MB
var MAX_HWM = 0x800000;
function computeNewHighWaterMark(n) {
if (n >= MAX_HWM) {
n = MAX_HWM;
} else {
// Get the next highest power of 2 to prevent increasing hwm excessively in
// tiny amounts
n--;
n |= n >>> 1;
n |= n >>> 2;
n |= n >>> 4;
n |= n >>> 8;
n |= n >>> 16;
n++;
}
return n;
}
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function howMuchToRead(n, state) {
if (n <= 0 || state.length === 0 && state.ended) return 0;
if (state.objectMode) return 1;
if (n !== n) {
// Only flow one buffer at a time
if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
}
// If we're asking for more than the current hwm, then raise the hwm.
if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
if (n <= state.length) return n;
// Don't have enough
if (!state.ended) {
state.needReadable = true;
return 0;
}
return state.length;
}
// you can override either this method, or the async _read(n) below.
Readable.prototype.read = function (n) {
debug('read', n);
n = parseInt(n, 10);
var state = this._readableState;
var nOrig = n;
if (n !== 0) state.emittedReadable = false;
// if we're doing read(0) to trigger a readable event, but we
// already have a bunch of data in the buffer, then just trigger
// the 'readable' event and move on.
if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
debug('read: emitReadable', state.length, state.ended);
if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
return null;
}
n = howMuchToRead(n, state);
// if we've ended, and we're now clear, then finish it up.
if (n === 0 && state.ended) {
if (state.length === 0) endReadable(this);
return null;
}
// All the actual chunk generation logic needs to be
// *below* the call to _read. The reason is that in certain
// synthetic stream cases, such as passthrough streams, _read
// may be a completely synchronous operation which may change
// the state of the read buffer, providing enough data when
// before there was *not* enough.
//
// So, the steps are:
// 1. Figure out what the state of things will be after we do
// a read from the buffer.
//
// 2. If that resulting state will trigger a _read, then call _read.
// Note that this may be asynchronous, or synchronous. Yes, it is
// deeply ugly to write APIs this way, but that still doesn't mean
// that the Readable class should behave improperly, as streams are
// designed to be sync/async agnostic.
// Take note if the _read call is sync or async (ie, if the read call
// has returned yet), so that we know whether or not it's safe to emit
// 'readable' etc.
//
// 3. Actually pull the requested chunks out of the buffer and return.
// if we need a readable event, then we need to do some reading.
var doRead = state.needReadable;
debug('need readable', doRead);
// if we currently have less than the highWaterMark, then also read some
if (state.length === 0 || state.length - n < state.highWaterMark) {
doRead = true;
debug('length less than watermark', doRead);
}
// however, if we've ended, then there's no point, and if we're already
// reading, then it's unnecessary.
if (state.ended || state.reading) {
doRead = false;
debug('reading or ended', doRead);
} else if (doRead) {
debug('do read');
state.reading = true;
state.sync = true;
// if the length is currently zero, then we *need* a readable event.
if (state.length === 0) state.needReadable = true;
// call internal read method
this._read(state.highWaterMark);
state.sync = false;
// If _read pushed data synchronously, then `reading` will be false,
// and we need to re-evaluate how much data we can return to the user.
if (!state.reading) n = howMuchToRead(nOrig, state);
}
var ret;
if (n > 0) ret = fromList(n, state);else ret = null;
if (ret === null) {
state.needReadable = true;
n = 0;
} else {
state.length -= n;
}
if (state.length === 0) {
// If we have nothing in the buffer, then we want to know
// as soon as we *do* get something into the buffer.
if (!state.ended) state.needReadable = true;
// If we tried to read() past the EOF, then emit end on the next tick.
if (nOrig !== n && state.ended) endReadable(this);
}
if (ret !== null) this.emit('data', ret);
return ret;
};
function onEofChunk(stream, state) {
if (state.ended) return;
if (state.decoder) {
var chunk = state.decoder.end();
if (chunk && chunk.length) {
state.buffer.push(chunk);
state.length += state.objectMode ? 1 : chunk.length;
}
}
state.ended = true;
// emit 'readable' now to make sure it gets picked up.
emitReadable(stream);
}
// Don't emit readable right away in sync mode, because this can trigger
// another read() call => stack overflow. This way, it might trigger
// a nextTick recursion warning, but that's not so bad.
function emitReadable(stream) {
var state = stream._readableState;
state.needReadable = false;
if (!state.emittedReadable) {
debug('emitReadable', state.flowing);
state.emittedReadable = true;
if (state.sync) pna.nextTick(emitReadable_, stream);else emitReadable_(stream);
}
}
function emitReadable_(stream) {
debug('emit readable');
stream.emit('readable');
flow(stream);
}
// at this point, the user has presumably seen the 'readable' event,
// and called read() to consume some data. that may have triggered
// in turn another _read(n) call, in which case reading = true if
// it's in progress.
// However, if we're not ended, or reading, and the length < hwm,
// then go ahead and try to read some more preemptively.
function maybeReadMore(stream, state) {
if (!state.readingMore) {
state.readingMore = true;
pna.nextTick(maybeReadMore_, stream, state);
}
}
function maybeReadMore_(stream, state) {
var len = state.length;
while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
debug('maybeReadMore read 0');
stream.read(0);
if (len === state.length)
// didn't get any data, stop spinning.
break;else len = state.length;
}
state.readingMore = false;
}
// abstract method. to be overridden in specific implementation classes.
// call cb(er, data) where data is <= n in length.
// for virtual (non-string, non-buffer) streams, "length" is somewhat
// arbitrary, and perhaps not very meaningful.
Readable.prototype._read = function (n) {
this.emit('error', new Error('_read() is not implemented'));
};
Readable.prototype.pipe = function (dest, pipeOpts) {
var src = this;
var state = this._readableState;
switch (state.pipesCount) {
case 0:
state.pipes = dest;
break;
case 1:
state.pipes = [state.pipes, dest];
break;
default:
state.pipes.push(dest);
break;
}
state.pipesCount += 1;
debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);
var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;
var endFn = doEnd ? onend : unpipe;
if (state.endEmitted) pna.nextTick(endFn);else src.once('end', endFn);
dest.on('unpipe', onunpipe);
function onunpipe(readable, unpipeInfo) {
debug('onunpipe');
if (readable === src) {
if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
unpipeInfo.hasUnpiped = true;
cleanup();
}
}
}
function onend() {
debug('onend');
dest.end();
}
// when the dest drains, it reduces the awaitDrain counter
// on the source. This would be more elegant with a .once()
// handler in flow(), but adding and removing repeatedly is
// too slow.
var ondrain = pipeOnDrain(src);
dest.on('drain', ondrain);
var cleanedUp = false;
function cleanup() {
debug('cleanup');
// cleanup event handlers once the pipe is broken
dest.removeListener('close', onclose);
dest.removeListener('finish', onfinish);
dest.removeListener('drain', ondrain);
dest.removeListener('error', onerror);
dest.removeListener('unpipe', onunpipe);
src.removeListener('end', onend);
src.removeListener('end', unpipe);
src.removeListener('data', ondata);
cleanedUp = true;
// if the reader is waiting for a drain event from this
// specific writer, then it would cause it to never start
// flowing again.
// So, if this is awaiting a drain, then we just call it now.
// If we don't know, then assume that we are waiting for one.
if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
}
// If the user pushes more data while we're writing to dest then we'll end up
// in ondata again. However, we only want to increase awaitDrain once because
// dest will only emit one 'drain' event for the multiple writes.
// => Introduce a guard on increasing awaitDrain.
var increasedAwaitDrain = false;
src.on('data', ondata);
function ondata(chunk) {
debug('ondata');
increasedAwaitDrain = false;
var ret = dest.write(chunk);
if (false === ret && !increasedAwaitDrain) {
// If the user unpiped during `dest.write()`, it is possible
// to get stuck in a permanently paused state if that write
// also returned false.
// => Check whether `dest` is still a piping destination.
if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
debug('false write response, pause', src._readableState.awaitDrain);
src._readableState.awaitDrain++;
increasedAwaitDrain = true;
}
src.pause();
}
}
// if the dest has an error, then stop piping into it.
// however, don't suppress the throwing behavior for this.
function onerror(er) {
debug('onerror', er);
unpipe();
dest.removeListener('error', onerror);
if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
}
// Make sure our error handler is attached before userland ones.
prependListener(dest, 'error', onerror);
// Both close and finish should trigger unpipe, but only once.
function onclose() {
dest.removeListener('finish', onfinish);
unpipe();
}
dest.once('close', onclose);
function onfinish() {
debug('onfinish');
dest.removeListener('close', onclose);
unpipe();
}
dest.once('finish', onfinish);
function unpipe() {
debug('unpipe');
src.unpipe(dest);
}
// tell the dest that it's being piped to
dest.emit('pipe', src);
// start the flow if it hasn't been started already.
if (!state.flowing) {
debug('pipe resume');
src.resume();
}
return dest;
};
function pipeOnDrain(src) {
return function () {
var state = src._readableState;
debug('pipeOnDrain', state.awaitDrain);
if (state.awaitDrain) state.awaitDrain--;
if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
state.flowing = true;
flow(src);
}
};
}
Readable.prototype.unpipe = function (dest) {
var state = this._readableState;
var unpipeInfo = { hasUnpiped: false };
// if we're not piping anywhere, then do nothing.
if (state.pipesCount === 0) return this;
// just one destination. most common case.
if (state.pipesCount === 1) {
// passed in one, but it's not the right one.
if (dest && dest !== state.pipes) return this;
if (!dest) dest = state.pipes;
// got a match.
state.pipes = null;
state.pipesCount = 0;
state.flowing = false;
if (dest) dest.emit('unpipe', this, unpipeInfo);
return this;
}
// slow case. multiple pipe destinations.
if (!dest) {
// remove all.
var dests = state.pipes;
var len = state.pipesCount;
state.pipes = null;
state.pipesCount = 0;
state.flowing = false;
for (var i = 0; i < len; i++) {
dests[i].emit('unpipe', this, unpipeInfo);
}return this;
}
// try to find the right one.
var index = indexOf(state.pipes, dest);
if (index === -1) return this;
state.pipes.splice(index, 1);
state.pipesCount -= 1;
if (state.pipesCount === 1) state.pipes = state.pipes[0];
dest.emit('unpipe', this, unpipeInfo);
return this;
};
// set up data events if they are asked for
// Ensure readable listeners eventually get something
Readable.prototype.on = function (ev, fn) {
var res = Stream.prototype.on.call(this, ev, fn);
if (ev === 'data') {
// Start flowing on next tick if stream isn't explicitly paused
if (this._readableState.flowing !== false) this.resume();
} else if (ev === 'readable') {
var state = this._readableState;
if (!state.endEmitted && !state.readableListening) {
state.readableListening = state.needReadable = true;
state.emittedReadable = false;
if (!state.reading) {
pna.nextTick(nReadingNextTick, this);
} else if (state.length) {
emitReadable(this);
}
}
}
return res;
};
Readable.prototype.addListener = Readable.prototype.on;
function nReadingNextTick(self) {
debug('readable nexttick read 0');
self.read(0);
}
// pause() and resume() are remnants of the legacy readable stream API
// If the user uses them, then switch into old mode.
Readable.prototype.resume = function () {
var state = this._readableState;
if (!state.flowing) {
debug('resume');
state.flowing = true;
resume(this, state);
}
return this;
};
function resume(stream, state) {
if (!state.resumeScheduled) {
state.resumeScheduled = true;
pna.nextTick(resume_, stream, state);
}
}
function resume_(stream, state) {
if (!state.reading) {
debug('resume read 0');
stream.read(0);
}
state.resumeScheduled = false;
state.awaitDrain = 0;
stream.emit('resume');
flow(stream);
if (state.flowing && !state.reading) stream.read(0);
}
Readable.prototype.pause = function () {
debug('call pause flowing=%j', this._readableState.flowing);
if (false !== this._readableState.flowing) {
debug('pause');
this._readableState.flowing = false;
this.emit('pause');
}
return this;
};
function flow(stream) {
var state = stream._readableState;
debug('flow', state.flowing);
while (state.flowing && stream.read() !== null) {}
}
// wrap an old-style stream as the async data source.
// This is *not* part of the readable stream interface.
// It is an ugly unfortunate mess of history.
Readable.prototype.wrap = function (stream) {
var _this = this;
var state = this._readableState;
var paused = false;
stream.on('end', function () {
debug('wrapped end');
if (state.decoder && !state.ended) {
var chunk = state.decoder.end();
if (chunk && chunk.length) _this.push(chunk);
}
_this.push(null);
});
stream.on('data', function (chunk) {
debug('wrapped data');
if (state.decoder) chunk = state.decoder.write(chunk);
// don't skip over falsy values in objectMode
if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;
var ret = _this.push(chunk);
if (!ret) {
paused = true;
stream.pause();
}
});
// proxy all the other methods.
// important when wrapping filters and duplexes.
for (var i in stream) {
if (this[i] === undefined && typeof stream[i] === 'function') {
this[i] = function (method) {
return function () {
return stream[method].apply(stream, arguments);
};
}(i);
}
}
// proxy certain important events.
for (var n = 0; n < kProxyEvents.length; n++) {
stream.on(kProxyEvents[n], this.emit.bind(this, kProxyEvents[n]));
}
// when we try to consume some more bytes, simply unpause the
// underlying stream.
this._read = function (n) {
debug('wrapped _read', n);
if (paused) {
paused = false;
stream.resume();
}
};
return this;
};
Object.defineProperty(Readable.prototype, 'readableHighWaterMark', {
// making it explicit this property is not enumerable
// because otherwise some prototype manipulation in
// userland will fail
enumerable: false,
get: function () {
return this._readableState.highWaterMark;
}
});
// exposed for testing purposes only.
Readable._fromList = fromList;
// Pluck off n bytes from an array of buffers.
// Length is the combined lengths of all the buffers in the list.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromList(n, state) {
// nothing buffered
if (state.length === 0) return null;
var ret;
if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
// read it all, truncate the list
if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);
state.buffer.clear();
} else {
// read part of list
ret = fromListPartial(n, state.buffer, state.decoder);
}
return ret;
}
// Extracts only enough buffered data to satisfy the amount requested.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromListPartial(n, list, hasStrings) {
var ret;
if (n < list.head.data.length) {
// slice is the same for buffers and strings
ret = list.head.data.slice(0, n);
list.head.data = list.head.data.slice(n);
} else if (n === list.head.data.length) {
// first chunk is a perfect match
ret = list.shift();
} else {
// result spans more than one buffer
ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
}
return ret;
}
// Copies a specified amount of characters from the list of buffered data
// chunks.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function copyFromBufferString(n, list) {
var p = list.head;
var c = 1;
var ret = p.data;
n -= ret.length;
while (p = p.next) {
var str = p.data;
var nb = n > str.length ? str.length : n;
if (nb === str.length) ret += str;else ret += str.slice(0, n);
n -= nb;
if (n === 0) {
if (nb === str.length) {
++c;
if (p.next) list.head = p.next;else list.head = list.tail = null;
} else {
list.head = p;
p.data = str.slice(nb);
}
break;
}
++c;
}
list.length -= c;
return ret;
}
// Copies a specified amount of bytes from the list of buffered data chunks.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function copyFromBuffer(n, list) {
var ret = Buffer.allocUnsafe(n);
var p = list.head;
var c = 1;
p.data.copy(ret);
n -= p.data.length;
while (p = p.next) {
var buf = p.data;
var nb = n > buf.length ? buf.length : n;
buf.copy(ret, ret.length - n, 0, nb);
n -= nb;
if (n === 0) {
if (nb === buf.length) {
++c;
if (p.next) list.head = p.next;else list.head = list.tail = null;
} else {
list.head = p;
p.data = buf.slice(nb);
}
break;
}
++c;
}
list.length -= c;
return ret;
}
function endReadable(stream) {
var state = stream._readableState;
// If we get here before consuming all the bytes, then that is a
// bug in node. Should never happen.
if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');
if (!state.endEmitted) {
state.ended = true;
pna.nextTick(endReadableNT, state, stream);
}
}
function endReadableNT(state, stream) {
// Check that we didn't get one last unshift.
if (!state.endEmitted && state.length === 0) {
state.endEmitted = true;
stream.readable = false;
stream.emit('end');
}
}
function indexOf(xs, x) {
for (var i = 0, l = xs.length; i < l; i++) {
if (xs[i] === x) return i;
}
return -1;
}
}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./_stream_duplex":19,"./internal/streams/BufferList":24,"./internal/streams/destroy":25,"./internal/streams/stream":26,"_process":17,"core-util-is":9,"events":10,"inherits":13,"isarray":15,"process-nextick-args":16,"safe-buffer":27,"string_decoder/":28,"util":7}],22:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// a transform stream is a readable/writable stream where you do
// something with the data. Sometimes it's called a "filter",
// but that's not a great name for it, since that implies a thing where
// some bits pass through, and others are simply ignored. (That would
// be a valid example of a transform, of course.)
//
// While the output is causally related to the input, it's not a
// necessarily symmetric or synchronous transformation. For example,
// a zlib stream might take multiple plain-text writes(), and then
// emit a single compressed chunk some time in the future.
//
// Here's how this works:
//
// The Transform stream has all the aspects of the readable and writable
// stream classes. When you write(chunk), that calls _write(chunk,cb)
// internally, and returns false if there's a lot of pending writes
// buffered up. When you call read(), that calls _read(n) until
// there's enough pending readable data buffered up.
//
// In a transform stream, the written data is placed in a buffer. When
// _read(n) is called, it transforms the queued up data, calling the
// buffered _write cb's as it consumes chunks. If consuming a single
// written chunk would result in multiple output chunks, then the first
// outputted bit calls the readcb, and subsequent chunks just go into
// the read buffer, and will cause it to emit 'readable' if necessary.
//
// This way, back-pressure is actually determined by the reading side,
// since _read has to be called to start processing a new chunk. However,
// a pathological inflate type of transform can cause excessive buffering
// here. For example, imagine a stream where every byte of input is
// interpreted as an integer from 0-255, and then results in that many
// bytes of output. Writing the 4 bytes {ff,ff,ff,ff} would result in
// 1kb of data being output. In this case, you could write a very small
// amount of input, and end up with a very large amount of output. In
// such a pathological inflating mechanism, there'd be no way to tell
// the system to stop doing the transform. A single 4MB write could
// cause the system to run out of memory.
//
// However, even in such a pathological case, only a single written chunk
// would be consumed, and then the rest would wait (un-transformed) until
// the results of the previous transformed chunk were consumed.
'use strict';
module.exports = Transform;
var Duplex = require('./_stream_duplex');
/*<replacement>*/
var util = Object.create(require('core-util-is'));
util.inherits = require('inherits');
/*</replacement>*/
util.inherits(Transform, Duplex);
function afterTransform(er, data) {
var ts = this._transformState;
ts.transforming = false;
var cb = ts.writecb;
if (!cb) {
return this.emit('error', new Error('write callback called multiple times'));
}
ts.writechunk = null;
ts.writecb = null;
if (data != null) // single equals check for both `null` and `undefined`
this.push(data);
cb(er);
var rs = this._readableState;
rs.reading = false;
if (rs.needReadable || rs.length < rs.highWaterMark) {
this._read(rs.highWaterMark);
}
}
function Transform(options) {
if (!(this instanceof Transform)) return new Transform(options);
Duplex.call(this, options);
this._transformState = {
afterTransform: afterTransform.bind(this),
needTransform: false,
transforming: false,
writecb: null,
writechunk: null,
writeencoding: null
};
// start out asking for a readable event once data is transformed.
this._readableState.needReadable = true;
// we have implemented the _read method, and done the other things
// that Readable wants before the first _read call, so unset the
// sync guard flag.
this._readableState.sync = false;
if (options) {
if (typeof options.transform === 'function') this._transform = options.transform;
if (typeof options.flush === 'function') this._flush = options.flush;
}
// When the writable side finishes, then flush out anything remaining.
this.on('prefinish', prefinish);
}
function prefinish() {
var _this = this;
if (typeof this._flush === 'function') {
this._flush(function (er, data) {
done(_this, er, data);
});
} else {
done(this, null, null);
}
}
Transform.prototype.push = function (chunk, encoding) {
this._transformState.needTransform = false;
return Duplex.prototype.push.call(this, chunk, encoding);
};
// This is the part where you do stuff!
// override this function in implementation classes.
// 'chunk' is an input chunk.
//
// Call `push(newChunk)` to pass along transformed output
// to the readable side. You may call 'push' zero or more times.
//
// Call `cb(err)` when you are done with this chunk. If you pass
// an error, then that'll put the hurt on the whole operation. If you
// never call cb(), then you'll never get another chunk.
Transform.prototype._transform = function (chunk, encoding, cb) {
throw new Error('_transform() is not implemented');
};
Transform.prototype._write = function (chunk, encoding, cb) {
var ts = this._transformState;
ts.writecb = cb;
ts.writechunk = chunk;
ts.writeencoding = encoding;
if (!ts.transforming) {
var rs = this._readableState;
if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
}
};
// Doesn't matter what the args are here.
// _transform does all the work.
// That we got here means that the readable side wants more data.
Transform.prototype._read = function (n) {
var ts = this._transformState;
if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
ts.transforming = true;
this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
} else {
// mark that we need a transform, so that any data that comes in
// will get processed, now that we've asked for it.
ts.needTransform = true;
}
};
Transform.prototype._destroy = function (err, cb) {
var _this2 = this;
Duplex.prototype._destroy.call(this, err, function (err2) {
cb(err2);
_this2.emit('close');
});
};
function done(stream, er, data) {
if (er) return stream.emit('error', er);
if (data != null) // single equals check for both `null` and `undefined`
stream.push(data);
// if there's nothing in the write buffer, then that means
// that nothing more will ever be provided
if (stream._writableState.length) throw new Error('Calling transform done when ws.length != 0');
if (stream._transformState.transforming) throw new Error('Calling transform done when still transforming');
return stream.push(null);
}
},{"./_stream_duplex":19,"core-util-is":9,"inherits":13}],23:[function(require,module,exports){
(function (process,global,setImmediate){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// A bit simpler than readable streams.
// Implement an async ._write(chunk, encoding, cb), and it'll handle all
// the drain event emission and buffering.
'use strict';
/*<replacement>*/
var pna = require('process-nextick-args');
/*</replacement>*/
module.exports = Writable;
/* <replacement> */
function WriteReq(chunk, encoding, cb) {
this.chunk = chunk;
this.encoding = encoding;
this.callback = cb;
this.next = null;
}
// It seems a linked list but it is not
// there will be only 2 of these for each stream
function CorkedRequest(state) {
var _this = this;
this.next = null;
this.entry = null;
this.finish = function () {
onCorkedFinish(_this, state);
};
}
/* </replacement> */
/*<replacement>*/
var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : pna.nextTick;
/*</replacement>*/
/*<replacement>*/
var Duplex;
/*</replacement>*/
Writable.WritableState = WritableState;
/*<replacement>*/
var util = Object.create(require('core-util-is'));
util.inherits = require('inherits');
/*</replacement>*/
/*<replacement>*/
var internalUtil = {
deprecate: require('util-deprecate')
};
/*</replacement>*/
/*<replacement>*/
var Stream = require('./internal/streams/stream');
/*</replacement>*/
/*<replacement>*/
var Buffer = require('safe-buffer').Buffer;
var OurUint8Array = global.Uint8Array || function () {};
function _uint8ArrayToBuffer(chunk) {
return Buffer.from(chunk);
}
function _isUint8Array(obj) {
return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
}
/*</replacement>*/
var destroyImpl = require('./internal/streams/destroy');
util.inherits(Writable, Stream);
function nop() {}
function WritableState(options, stream) {
Duplex = Duplex || require('./_stream_duplex');
options = options || {};
// Duplex streams are both readable and writable, but share
// the same options object.
// However, some cases require setting options to different
// values for the readable and the writable sides of the duplex stream.
// These options can be provided separately as readableXXX and writableXXX.
var isDuplex = stream instanceof Duplex;
// object stream flag to indicate whether or not this stream
// contains buffers or objects.
this.objectMode = !!options.objectMode;
if (isDuplex) this.objectMode = this.objectMode || !!options.writableObjectMode;
// the point at which write() starts returning false
// Note: 0 is a valid value, means that we always return false if
// the entire buffer is not flushed immediately on write()
var hwm = options.highWaterMark;
var writableHwm = options.writableHighWaterMark;
var defaultHwm = this.objectMode ? 16 : 16 * 1024;
if (hwm || hwm === 0) this.highWaterMark = hwm;else if (isDuplex && (writableHwm || writableHwm === 0)) this.highWaterMark = writableHwm;else this.highWaterMark = defaultHwm;
// cast to ints.
this.highWaterMark = Math.floor(this.highWaterMark);
// if _final has been called
this.finalCalled = false;
// drain event flag.
this.needDrain = false;
// at the start of calling end()
this.ending = false;
// when end() has been called, and returned
this.ended = false;
// when 'finish' is emitted
this.finished = false;
// has it been destroyed
this.destroyed = false;
// should we decode strings into buffers before passing to _write?
// this is here so that some node-core streams can optimize string
// handling at a lower level.
var noDecode = options.decodeStrings === false;
this.decodeStrings = !noDecode;
// Crypto is kind of old and crusty. Historically, its default string
// encoding is 'binary' so we have to make this configurable.
// Everything else in the universe uses 'utf8', though.
this.defaultEncoding = options.defaultEncoding || 'utf8';
// not an actual buffer we keep track of, but a measurement
// of how much we're waiting to get pushed to some underlying
// socket or file.
this.length = 0;
// a flag to see when we're in the middle of a write.
this.writing = false;
// when true all writes will be buffered until .uncork() call
this.corked = 0;
// a flag to be able to tell if the onwrite cb is called immediately,
// or on a later tick. We set this to true at first, because any
// actions that shouldn't happen until "later" should generally also
// not happen before the first write call.
this.sync = true;
// a flag to know if we're processing previously buffered items, which
// may call the _write() callback in the same tick, so that we don't
// end up in an overlapped onwrite situation.
this.bufferProcessing = false;
// the callback that's passed to _write(chunk,cb)
this.onwrite = function (er) {
onwrite(stream, er);
};
// the callback that the user supplies to write(chunk,encoding,cb)
this.writecb = null;
// the amount that is being written when _write is called.
this.writelen = 0;
this.bufferedRequest = null;
this.lastBufferedRequest = null;
// number of pending user-supplied write callbacks
// this must be 0 before 'finish' can be emitted
this.pendingcb = 0;
// emit prefinish if the only thing we're waiting for is _write cbs
// This is relevant for synchronous Transform streams
this.prefinished = false;
// True if the error was already emitted and should not be thrown again
this.errorEmitted = false;
// count buffered requests
this.bufferedRequestCount = 0;
// allocate the first CorkedRequest, there is always
// one allocated and free to use, and we maintain at most two
this.corkedRequestsFree = new CorkedRequest(this);
}
WritableState.prototype.getBuffer = function getBuffer() {
var current = this.bufferedRequest;
var out = [];
while (current) {
out.push(current);
current = current.next;
}
return out;
};
(function () {
try {
Object.defineProperty(WritableState.prototype, 'buffer', {
get: internalUtil.deprecate(function () {
return this.getBuffer();
}, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
});
} catch (_) {}
})();
// Test _writableState for inheritance to account for Duplex streams,
// whose prototype chain only points to Readable.
var realHasInstance;
if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
realHasInstance = Function.prototype[Symbol.hasInstance];
Object.defineProperty(Writable, Symbol.hasInstance, {
value: function (object) {
if (realHasInstance.call(this, object)) return true;
if (this !== Writable) return false;
return object && object._writableState instanceof WritableState;
}
});
} else {
realHasInstance = function (object) {
return object instanceof this;
};
}
function Writable(options) {
Duplex = Duplex || require('./_stream_duplex');
// Writable ctor is applied to Duplexes, too.
// `realHasInstance` is necessary because using plain `instanceof`
// would return false, as no `_writableState` property is attached.
// Trying to use the custom `instanceof` for Writable here will also break the
// Node.js LazyTransform implementation, which has a non-trivial getter for
// `_writableState` that would lead to infinite recursion.
if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {
return new Writable(options);
}
this._writableState = new WritableState(options, this);
// legacy.
this.writable = true;
if (options) {
if (typeof options.write === 'function') this._write = options.write;
if (typeof options.writev === 'function') this._writev = options.writev;
if (typeof options.destroy === 'function') this._destroy = options.destroy;
if (typeof options.final === 'function') this._final = options.final;
}
Stream.call(this);
}
// Otherwise people can pipe Writable streams, which is just wrong.
Writable.prototype.pipe = function () {
this.emit('error', new Error('Cannot pipe, not readable'));
};
function writeAfterEnd(stream, cb) {
var er = new Error('write after end');
// TODO: defer error events consistently everywhere, not just the cb
stream.emit('error', er);
pna.nextTick(cb, er);
}
// Checks that a user-supplied chunk is valid, especially for the particular
// mode the stream is in. Currently this means that `null` is never accepted
// and undefined/non-string values are only allowed in object mode.
function validChunk(stream, state, chunk, cb) {
var valid = true;
var er = false;
if (chunk === null) {
er = new TypeError('May not write null values to stream');
} else if (typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
er = new TypeError('Invalid non-string/buffer chunk');
}
if (er) {
stream.emit('error', er);
pna.nextTick(cb, er);
valid = false;
}
return valid;
}
Writable.prototype.write = function (chunk, encoding, cb) {
var state = this._writableState;
var ret = false;
var isBuf = !state.objectMode && _isUint8Array(chunk);
if (isBuf && !Buffer.isBuffer(chunk)) {
chunk = _uint8ArrayToBuffer(chunk);
}
if (typeof encoding === 'function') {
cb = encoding;
encoding = null;
}
if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;
if (typeof cb !== 'function') cb = nop;
if (state.ended) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
state.pendingcb++;
ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
}
return ret;
};
Writable.prototype.cork = function () {
var state = this._writableState;
state.corked++;
};
Writable.prototype.uncork = function () {
var state = this._writableState;
if (state.corked) {
state.corked--;
if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
}
};
Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
// node::ParseEncoding() requires lower case.
if (typeof encoding === 'string') encoding = encoding.toLowerCase();
if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
this._writableState.defaultEncoding = encoding;
return this;
};
function decodeChunk(state, chunk, encoding) {
if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
chunk = Buffer.from(chunk, encoding);
}
return chunk;
}
Object.defineProperty(Writable.prototype, 'writableHighWaterMark', {
// making it explicit this property is not enumerable
// because otherwise some prototype manipulation in
// userland will fail
enumerable: false,
get: function () {
return this._writableState.highWaterMark;
}
});
// if we're already writing something, then just put this
// in the queue, and wait our turn. Otherwise, call _write
// If we return false, then we need a drain event, so set that flag.
function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
if (!isBuf) {
var newChunk = decodeChunk(state, chunk, encoding);
if (chunk !== newChunk) {
isBuf = true;
encoding = 'buffer';
chunk = newChunk;
}
}
var len = state.objectMode ? 1 : chunk.length;
state.length += len;
var ret = state.length < state.highWaterMark;
// we must ensure that previous needDrain will not be reset to false.
if (!ret) state.needDrain = true;
if (state.writing || state.corked) {
var last = state.lastBufferedRequest;
state.lastBufferedRequest = {
chunk: chunk,
encoding: encoding,
isBuf: isBuf,
callback: cb,
next: null
};
if (last) {
last.next = state.lastBufferedRequest;
} else {
state.bufferedRequest = state.lastBufferedRequest;
}
state.bufferedRequestCount += 1;
} else {
doWrite(stream, state, false, len, chunk, encoding, cb);
}
return ret;
}
function doWrite(stream, state, writev, len, chunk, encoding, cb) {
state.writelen = len;
state.writecb = cb;
state.writing = true;
state.sync = true;
if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
state.sync = false;
}
function onwriteError(stream, state, sync, er, cb) {
--state.pendingcb;
if (sync) {
// defer the callback if we are being called synchronously
// to avoid piling up things on the stack
pna.nextTick(cb, er);
// this can emit finish, and it will always happen
// after error
pna.nextTick(finishMaybe, stream, state);
stream._writableState.errorEmitted = true;
stream.emit('error', er);
} else {
// the caller expect this to happen before if
// it is async
cb(er);
stream._writableState.errorEmitted = true;
stream.emit('error', er);
// this can emit finish, but finish must
// always follow error
finishMaybe(stream, state);
}
}
function onwriteStateUpdate(state) {
state.writing = false;
state.writecb = null;
state.length -= state.writelen;
state.writelen = 0;
}
function onwrite(stream, er) {
var state = stream._writableState;
var sync = state.sync;
var cb = state.writecb;
onwriteStateUpdate(state);
if (er) onwriteError(stream, state, sync, er, cb);else {
// Check if we're actually ready to finish, but don't emit yet
var finished = needFinish(state);
if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
clearBuffer(stream, state);
}
if (sync) {
/*<replacement>*/
asyncWrite(afterWrite, stream, state, finished, cb);
/*</replacement>*/
} else {
afterWrite(stream, state, finished, cb);
}
}
}
function afterWrite(stream, state, finished, cb) {
if (!finished) onwriteDrain(stream, state);
state.pendingcb--;
cb();
finishMaybe(stream, state);
}
// Must force callback to be called on nextTick, so that we don't
// emit 'drain' before the write() consumer gets the 'false' return
// value, and has a chance to attach a 'drain' listener.
function onwriteDrain(stream, state) {
if (state.length === 0 && state.needDrain) {
state.needDrain = false;
stream.emit('drain');
}
}
// if there's something in the buffer waiting, then process it
function clearBuffer(stream, state) {
state.bufferProcessing = true;
var entry = state.bufferedRequest;
if (stream._writev && entry && entry.next) {
// Fast case, write everything using _writev()
var l = state.bufferedRequestCount;
var buffer = new Array(l);
var holder = state.corkedRequestsFree;
holder.entry = entry;
var count = 0;
var allBuffers = true;
while (entry) {
buffer[count] = entry;
if (!entry.isBuf) allBuffers = false;
entry = entry.next;
count += 1;
}
buffer.allBuffers = allBuffers;
doWrite(stream, state, true, state.length, buffer, '', holder.finish);
// doWrite is almost always async, defer these to save a bit of time
// as the hot path ends with doWrite
state.pendingcb++;
state.lastBufferedRequest = null;
if (holder.next) {
state.corkedRequestsFree = holder.next;
holder.next = null;
} else {
state.corkedRequestsFree = new CorkedRequest(state);
}
state.bufferedRequestCount = 0;
} else {
// Slow case, write chunks one-by-one
while (entry) {
var chunk = entry.chunk;
var encoding = entry.encoding;
var cb = entry.callback;
var len = state.objectMode ? 1 : chunk.length;
doWrite(stream, state, false, len, chunk, encoding, cb);
entry = entry.next;
state.bufferedRequestCount--;
// if we didn't call the onwrite immediately, then
// it means that we need to wait until it does.
// also, that means that the chunk and cb are currently
// being processed, so move the buffer counter past them.
if (state.writing) {
break;
}
}
if (entry === null) state.lastBufferedRequest = null;
}
state.bufferedRequest = entry;
state.bufferProcessing = false;
}
Writable.prototype._write = function (chunk, encoding, cb) {
cb(new Error('_write() is not implemented'));
};
Writable.prototype._writev = null;
Writable.prototype.end = function (chunk, encoding, cb) {
var state = this._writableState;
if (typeof chunk === 'function') {
cb = chunk;
chunk = null;
encoding = null;
} else if (typeof encoding === 'function') {
cb = encoding;
encoding = null;
}
if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);
// .end() fully uncorks
if (state.corked) {
state.corked = 1;
this.uncork();
}
// ignore unnecessary end() calls.
if (!state.ending && !state.finished) endWritable(this, state, cb);
};
function needFinish(state) {
return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
}
function callFinal(stream, state) {
stream._final(function (err) {
state.pendingcb--;
if (err) {
stream.emit('error', err);
}
state.prefinished = true;
stream.emit('prefinish');
finishMaybe(stream, state);
});
}
function prefinish(stream, state) {
if (!state.prefinished && !state.finalCalled) {
if (typeof stream._final === 'function') {
state.pendingcb++;
state.finalCalled = true;
pna.nextTick(callFinal, stream, state);
} else {
state.prefinished = true;
stream.emit('prefinish');
}
}
}
function finishMaybe(stream, state) {
var need = needFinish(state);
if (need) {
prefinish(stream, state);
if (state.pendingcb === 0) {
state.finished = true;
stream.emit('finish');
}
}
return need;
}
function endWritable(stream, state, cb) {
state.ending = true;
finishMaybe(stream, state);
if (cb) {
if (state.finished) pna.nextTick(cb);else stream.once('finish', cb);
}
state.ended = true;
stream.writable = false;
}
function onCorkedFinish(corkReq, state, err) {
var entry = corkReq.entry;
corkReq.entry = null;
while (entry) {
var cb = entry.callback;
state.pendingcb--;
cb(err);
entry = entry.next;
}
if (state.corkedRequestsFree) {
state.corkedRequestsFree.next = corkReq;
} else {
state.corkedRequestsFree = corkReq;
}
}
Object.defineProperty(Writable.prototype, 'destroyed', {
get: function () {
if (this._writableState === undefined) {
return false;
}
return this._writableState.destroyed;
},
set: function (value) {
// we ignore the value if the stream
// has not been initialized yet
if (!this._writableState) {
return;
}
// backward compatibility, the user is explicitly
// managing destroyed
this._writableState.destroyed = value;
}
});
Writable.prototype.destroy = destroyImpl.destroy;
Writable.prototype._undestroy = destroyImpl.undestroy;
Writable.prototype._destroy = function (err, cb) {
this.end();
cb(err);
};
}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {},require("timers").setImmediate)
},{"./_stream_duplex":19,"./internal/streams/destroy":25,"./internal/streams/stream":26,"_process":17,"core-util-is":9,"inherits":13,"process-nextick-args":16,"safe-buffer":27,"timers":35,"util-deprecate":36}],24:[function(require,module,exports){
'use strict';
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
var Buffer = require('safe-buffer').Buffer;
var util = require('util');
function copyBuffer(src, target, offset) {
src.copy(target, offset);
}
module.exports = function () {
function BufferList() {
_classCallCheck(this, BufferList);
this.head = null;
this.tail = null;
this.length = 0;
}
BufferList.prototype.push = function push(v) {
var entry = { data: v, next: null };
if (this.length > 0) this.tail.next = entry;else this.head = entry;
this.tail = entry;
++this.length;
};
BufferList.prototype.unshift = function unshift(v) {
var entry = { data: v, next: this.head };
if (this.length === 0) this.tail = entry;
this.head = entry;
++this.length;
};
BufferList.prototype.shift = function shift() {
if (this.length === 0) return;
var ret = this.head.data;
if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
--this.length;
return ret;
};
BufferList.prototype.clear = function clear() {
this.head = this.tail = null;
this.length = 0;
};
BufferList.prototype.join = function join(s) {
if (this.length === 0) return '';
var p = this.head;
var ret = '' + p.data;
while (p = p.next) {
ret += s + p.data;
}return ret;
};
BufferList.prototype.concat = function concat(n) {
if (this.length === 0) return Buffer.alloc(0);
if (this.length === 1) return this.head.data;
var ret = Buffer.allocUnsafe(n >>> 0);
var p = this.head;
var i = 0;
while (p) {
copyBuffer(p.data, ret, i);
i += p.data.length;
p = p.next;
}
return ret;
};
return BufferList;
}();
if (util && util.inspect && util.inspect.custom) {
module.exports.prototype[util.inspect.custom] = function () {
var obj = util.inspect({ length: this.length });
return this.constructor.name + ' ' + obj;
};
}
},{"safe-buffer":27,"util":7}],25:[function(require,module,exports){
'use strict';
/*<replacement>*/
var pna = require('process-nextick-args');
/*</replacement>*/
// undocumented cb() API, needed for core, not for public API
function destroy(err, cb) {
var _this = this;
var readableDestroyed = this._readableState && this._readableState.destroyed;
var writableDestroyed = this._writableState && this._writableState.destroyed;
if (readableDestroyed || writableDestroyed) {
if (cb) {
cb(err);
} else if (err && (!this._writableState || !this._writableState.errorEmitted)) {
pna.nextTick(emitErrorNT, this, err);
}
return this;
}
// we set destroyed to true before firing error callbacks in order
// to make it re-entrance safe in case destroy() is called within callbacks
if (this._readableState) {
this._readableState.destroyed = true;
}
// if this is a duplex stream mark the writable part as destroyed as well
if (this._writableState) {
this._writableState.destroyed = true;
}
this._destroy(err || null, function (err) {
if (!cb && err) {
pna.nextTick(emitErrorNT, _this, err);
if (_this._writableState) {
_this._writableState.errorEmitted = true;
}
} else if (cb) {
cb(err);
}
});
return this;
}
function undestroy() {
if (this._readableState) {
this._readableState.destroyed = false;
this._readableState.reading = false;
this._readableState.ended = false;
this._readableState.endEmitted = false;
}
if (this._writableState) {
this._writableState.destroyed = false;
this._writableState.ended = false;
this._writableState.ending = false;
this._writableState.finished = false;
this._writableState.errorEmitted = false;
}
}
function emitErrorNT(self, err) {
self.emit('error', err);
}
module.exports = {
destroy: destroy,
undestroy: undestroy
};
},{"process-nextick-args":16}],26:[function(require,module,exports){
module.exports = require('events').EventEmitter;
},{"events":10}],27:[function(require,module,exports){
/* eslint-disable node/no-deprecated-api */
var buffer = require('buffer')
var Buffer = buffer.Buffer
// alternative to using Object.keys for old browsers
function copyProps (src, dst) {
for (var key in src) {
dst[key] = src[key]
}
}
if (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) {
module.exports = buffer
} else {
// Copy properties from require('buffer')
copyProps(buffer, exports)
exports.Buffer = SafeBuffer
}
function SafeBuffer (arg, encodingOrOffset, length) {
return Buffer(arg, encodingOrOffset, length)
}
// Copy static methods from Buffer
copyProps(Buffer, SafeBuffer)
SafeBuffer.from = function (arg, encodingOrOffset, length) {
if (typeof arg === 'number') {
throw new TypeError('Argument must not be a number')
}
return Buffer(arg, encodingOrOffset, length)
}
SafeBuffer.alloc = function (size, fill, encoding) {
if (typeof size !== 'number') {
throw new TypeError('Argument must be a number')
}
var buf = Buffer(size)
if (fill !== undefined) {
if (typeof encoding === 'string') {
buf.fill(fill, encoding)
} else {
buf.fill(fill)
}
} else {
buf.fill(0)
}
return buf
}
SafeBuffer.allocUnsafe = function (size) {
if (typeof size !== 'number') {
throw new TypeError('Argument must be a number')
}
return Buffer(size)
}
SafeBuffer.allocUnsafeSlow = function (size) {
if (typeof size !== 'number') {
throw new TypeError('Argument must be a number')
}
return buffer.SlowBuffer(size)
}
},{"buffer":8}],28:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';
/*<replacement>*/
var Buffer = require('safe-buffer').Buffer;
/*</replacement>*/
var isEncoding = Buffer.isEncoding || function (encoding) {
encoding = '' + encoding;
switch (encoding && encoding.toLowerCase()) {
case 'hex':case 'utf8':case 'utf-8':case 'ascii':case 'binary':case 'base64':case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':case 'raw':
return true;
default:
return false;
}
};
function _normalizeEncoding(enc) {
if (!enc) return 'utf8';
var retried;
while (true) {
switch (enc) {
case 'utf8':
case 'utf-8':
return 'utf8';
case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return 'utf16le';
case 'latin1':
case 'binary':
return 'latin1';
case 'base64':
case 'ascii':
case 'hex':
return enc;
default:
if (retried) return; // undefined
enc = ('' + enc).toLowerCase();
retried = true;
}
}
};
// Do not cache `Buffer.isEncoding` when checking encoding names as some
// modules monkey-patch it to support additional encodings
function normalizeEncoding(enc) {
var nenc = _normalizeEncoding(enc);
if (typeof nenc !== 'string' && (Buffer.isEncoding === isEncoding || !isEncoding(enc))) throw new Error('Unknown encoding: ' + enc);
return nenc || enc;
}
// StringDecoder provides an interface for efficiently splitting a series of
// buffers into a series of JS strings without breaking apart multi-byte
// characters.
exports.StringDecoder = StringDecoder;
function StringDecoder(encoding) {
this.encoding = normalizeEncoding(encoding);
var nb;
switch (this.encoding) {
case 'utf16le':
this.text = utf16Text;
this.end = utf16End;
nb = 4;
break;
case 'utf8':
this.fillLast = utf8FillLast;
nb = 4;
break;
case 'base64':
this.text = base64Text;
this.end = base64End;
nb = 3;
break;
default:
this.write = simpleWrite;
this.end = simpleEnd;
return;
}
this.lastNeed = 0;
this.lastTotal = 0;
this.lastChar = Buffer.allocUnsafe(nb);
}
StringDecoder.prototype.write = function (buf) {
if (buf.length === 0) return '';
var r;
var i;
if (this.lastNeed) {
r = this.fillLast(buf);
if (r === undefined) return '';
i = this.lastNeed;
this.lastNeed = 0;
} else {
i = 0;
}
if (i < buf.length) return r ? r + this.text(buf, i) : this.text(buf, i);
return r || '';
};
StringDecoder.prototype.end = utf8End;
// Returns only complete characters in a Buffer
StringDecoder.prototype.text = utf8Text;
// Attempts to complete a partial non-UTF-8 character using bytes from a Buffer
StringDecoder.prototype.fillLast = function (buf) {
if (this.lastNeed <= buf.length) {
buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, this.lastNeed);
return this.lastChar.toString(this.encoding, 0, this.lastTotal);
}
buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, buf.length);
this.lastNeed -= buf.length;
};
// Checks the type of a UTF-8 byte, whether it's ASCII, a leading byte, or a
// continuation byte. If an invalid byte is detected, -2 is returned.
function utf8CheckByte(byte) {
if (byte <= 0x7F) return 0;else if (byte >> 5 === 0x06) return 2;else if (byte >> 4 === 0x0E) return 3;else if (byte >> 3 === 0x1E) return 4;
return byte >> 6 === 0x02 ? -1 : -2;
}
// Checks at most 3 bytes at the end of a Buffer in order to detect an
// incomplete multi-byte UTF-8 character. The total number of bytes (2, 3, or 4)
// needed to complete the UTF-8 character (if applicable) are returned.
function utf8CheckIncomplete(self, buf, i) {
var j = buf.length - 1;
if (j < i) return 0;
var nb = utf8CheckByte(buf[j]);
if (nb >= 0) {
if (nb > 0) self.lastNeed = nb - 1;
return nb;
}
if (--j < i || nb === -2) return 0;
nb = utf8CheckByte(buf[j]);
if (nb >= 0) {
if (nb > 0) self.lastNeed = nb - 2;
return nb;
}
if (--j < i || nb === -2) return 0;
nb = utf8CheckByte(buf[j]);
if (nb >= 0) {
if (nb > 0) {
if (nb === 2) nb = 0;else self.lastNeed = nb - 3;
}
return nb;
}
return 0;
}
// Validates as many continuation bytes for a multi-byte UTF-8 character as
// needed or are available. If we see a non-continuation byte where we expect
// one, we "replace" the validated continuation bytes we've seen so far with
// a single UTF-8 replacement character ('\ufffd'), to match v8's UTF-8 decoding
// behavior. The continuation byte check is included three times in the case
// where all of the continuation bytes for a character exist in the same buffer.
// It is also done this way as a slight performance increase instead of using a
// loop.
function utf8CheckExtraBytes(self, buf, p) {
if ((buf[0] & 0xC0) !== 0x80) {
self.lastNeed = 0;
return '\ufffd';
}
if (self.lastNeed > 1 && buf.length > 1) {
if ((buf[1] & 0xC0) !== 0x80) {
self.lastNeed = 1;
return '\ufffd';
}
if (self.lastNeed > 2 && buf.length > 2) {
if ((buf[2] & 0xC0) !== 0x80) {
self.lastNeed = 2;
return '\ufffd';
}
}
}
}
// Attempts to complete a multi-byte UTF-8 character using bytes from a Buffer.
function utf8FillLast(buf) {
var p = this.lastTotal - this.lastNeed;
var r = utf8CheckExtraBytes(this, buf, p);
if (r !== undefined) return r;
if (this.lastNeed <= buf.length) {
buf.copy(this.lastChar, p, 0, this.lastNeed);
return this.lastChar.toString(this.encoding, 0, this.lastTotal);
}
buf.copy(this.lastChar, p, 0, buf.length);
this.lastNeed -= buf.length;
}
// Returns all complete UTF-8 characters in a Buffer. If the Buffer ended on a
// partial character, the character's bytes are buffered until the required
// number of bytes are available.
function utf8Text(buf, i) {
var total = utf8CheckIncomplete(this, buf, i);
if (!this.lastNeed) return buf.toString('utf8', i);
this.lastTotal = total;
var end = buf.length - (total - this.lastNeed);
buf.copy(this.lastChar, 0, end);
return buf.toString('utf8', i, end);
}
// For UTF-8, a replacement character is added when ending on a partial
// character.
function utf8End(buf) {
var r = buf && buf.length ? this.write(buf) : '';
if (this.lastNeed) return r + '\ufffd';
return r;
}
// UTF-16LE typically needs two bytes per character, but even if we have an even
// number of bytes available, we need to check if we end on a leading/high
// surrogate. In that case, we need to wait for the next two bytes in order to
// decode the last character properly.
function utf16Text(buf, i) {
if ((buf.length - i) % 2 === 0) {
var r = buf.toString('utf16le', i);
if (r) {
var c = r.charCodeAt(r.length - 1);
if (c >= 0xD800 && c <= 0xDBFF) {
this.lastNeed = 2;
this.lastTotal = 4;
this.lastChar[0] = buf[buf.length - 2];
this.lastChar[1] = buf[buf.length - 1];
return r.slice(0, -1);
}
}
return r;
}
this.lastNeed = 1;
this.lastTotal = 2;
this.lastChar[0] = buf[buf.length - 1];
return buf.toString('utf16le', i, buf.length - 1);
}
// For UTF-16LE we do not explicitly append special replacement characters if we
// end on a partial character, we simply let v8 handle that.
function utf16End(buf) {
var r = buf && buf.length ? this.write(buf) : '';
if (this.lastNeed) {
var end = this.lastTotal - this.lastNeed;
return r + this.lastChar.toString('utf16le', 0, end);
}
return r;
}
function base64Text(buf, i) {
var n = (buf.length - i) % 3;
if (n === 0) return buf.toString('base64', i);
this.lastNeed = 3 - n;
this.lastTotal = 3;
if (n === 1) {
this.lastChar[0] = buf[buf.length - 1];
} else {
this.lastChar[0] = buf[buf.length - 2];
this.lastChar[1] = buf[buf.length - 1];
}
return buf.toString('base64', i, buf.length - n);
}
function base64End(buf) {
var r = buf && buf.length ? this.write(buf) : '';
if (this.lastNeed) return r + this.lastChar.toString('base64', 0, 3 - this.lastNeed);
return r;
}
// Pass bytes on through for single-byte encodings (e.g. ascii, latin1, hex)
function simpleWrite(buf) {
return buf.toString(this.encoding);
}
function simpleEnd(buf) {
return buf && buf.length ? this.write(buf) : '';
}
},{"safe-buffer":27}],29:[function(require,module,exports){
module.exports = require('./readable').PassThrough
},{"./readable":30}],30:[function(require,module,exports){
exports = module.exports = require('./lib/_stream_readable.js');
exports.Stream = exports;
exports.Readable = exports;
exports.Writable = require('./lib/_stream_writable.js');
exports.Duplex = require('./lib/_stream_duplex.js');
exports.Transform = require('./lib/_stream_transform.js');
exports.PassThrough = require('./lib/_stream_passthrough.js');
},{"./lib/_stream_duplex.js":19,"./lib/_stream_passthrough.js":20,"./lib/_stream_readable.js":21,"./lib/_stream_transform.js":22,"./lib/_stream_writable.js":23}],31:[function(require,module,exports){
module.exports = require('./readable').Transform
},{"./readable":30}],32:[function(require,module,exports){
module.exports = require('./lib/_stream_writable.js');
},{"./lib/_stream_writable.js":23}],33:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
module.exports = Stream;
var EE = require('events').EventEmitter;
var inherits = require('inherits');
inherits(Stream, EE);
Stream.Readable = require('readable-stream/readable.js');
Stream.Writable = require('readable-stream/writable.js');
Stream.Duplex = require('readable-stream/duplex.js');
Stream.Transform = require('readable-stream/transform.js');
Stream.PassThrough = require('readable-stream/passthrough.js');
// Backwards-compat with node 0.4.x
Stream.Stream = Stream;
// old-style streams. Note that the pipe method (the only relevant
// part of this class) is overridden in the Readable class.
function Stream() {
EE.call(this);
}
Stream.prototype.pipe = function(dest, options) {
var source = this;
function ondata(chunk) {
if (dest.writable) {
if (false === dest.write(chunk) && source.pause) {
source.pause();
}
}
}
source.on('data', ondata);
function ondrain() {
if (source.readable && source.resume) {
source.resume();
}
}
dest.on('drain', ondrain);
// If the 'end' option is not supplied, dest.end() will be called when
// source gets the 'end' or 'close' events. Only dest.end() once.
if (!dest._isStdio && (!options || options.end !== false)) {
source.on('end', onend);
source.on('close', onclose);
}
var didOnEnd = false;
function onend() {
if (didOnEnd) return;
didOnEnd = true;
dest.end();
}
function onclose() {
if (didOnEnd) return;
didOnEnd = true;
if (typeof dest.destroy === 'function') dest.destroy();
}
// don't leave dangling pipes when there are errors.
function onerror(er) {
cleanup();
if (EE.listenerCount(this, 'error') === 0) {
throw er; // Unhandled stream error in pipe.
}
}
source.on('error', onerror);
dest.on('error', onerror);
// remove all the event listeners that were added.
function cleanup() {
source.removeListener('data', ondata);
dest.removeListener('drain', ondrain);
source.removeListener('end', onend);
source.removeListener('close', onclose);
source.removeListener('error', onerror);
dest.removeListener('error', onerror);
source.removeListener('end', cleanup);
source.removeListener('close', cleanup);
dest.removeListener('close', cleanup);
}
source.on('end', cleanup);
source.on('close', cleanup);
dest.on('close', cleanup);
dest.emit('pipe', source);
// Allow for unix-like usage: A.pipe(B).pipe(C)
return dest;
};
},{"events":10,"inherits":13,"readable-stream/duplex.js":18,"readable-stream/passthrough.js":29,"readable-stream/readable.js":30,"readable-stream/transform.js":31,"readable-stream/writable.js":32}],34:[function(require,module,exports){
(function (Buffer){
var _ = {};
// These functions approximately reproduce the (pre-node 10) noAssert functionality,
// which allowed reading/writing past the end of a buffer, but 0-padding/ignoring
// any extra content.
function truncatedReadUInt32BE(buffer, offset) {
var availableBytes = buffer.length - offset;
if (availableBytes >= 4) {
return buffer.readUInt32BE(offset);
} else if (availableBytes === 3) {
var first = buffer.readUInt16BE(offset);
var second = buffer.readUInt8(offset + 2);
return ((first << 8) + second) << 8 >>> 0;
} else if (availableBytes === 2) {
return buffer.readUInt16BE(offset) << 16 >>> 0;
} else if (availableBytes === 1) {
return buffer.readUInt8(offset) << 24 >>> 0;
} else if (availableBytes <= 0) {
return 0x0;
}
}
function truncatedWriteUInt32BE(buffer, offset, data) {
var availableBytes = buffer.length - offset;
if (availableBytes >= 4) {
buffer.writeUInt32BE(data, offset);
} else if (availableBytes === 3) {
buffer.writeUInt16BE(data >>> 16, offset);
buffer.writeUInt8((data >>> 8) & 0xff, offset + 2);
} else if (availableBytes === 2) {
buffer.writeUInt16BE(data >>> 16, offset);
} else if (availableBytes === 1) {
buffer.writeUInt8(data >>> 24, offset);
}
}
// new Buffer() is deprecated in recent node. This ensures
// we always use the correct method for the current node.
function newBuffer(size) {
if (Buffer.alloc) {
return Buffer.alloc(size);
} else {
return new Buffer(size);
}
}
function extend(obj) {
Array.prototype.slice.call(arguments, 1).forEach(function (ext) {
Object.keys(ext).forEach(function (key) {
obj[key] = ext[key];
});
});
return obj;
}
function addField(ctr, f) {
if ('width' in f) {
ctr.bits = (ctr.bits || 0) + f.width;
while (ctr.bits > 7) {
ctr.bytes += 1;
ctr.bits -= 8;
}
} else if (!ctr.bits) {
ctr.bytes += f.size;
} else {
throw Error("Improperly aligned bitfield before field: "+f.name);
}
return ctr;
}
function arrayizeField(f, count) {
var f2 = (typeof count === 'number') ? extend({
name: f.name,
field: f,
valueFromBytes: function (buf, off) {
off || (off = {bytes:0, bits:0});
var arr = new Array(count);
for (var idx = 0, len = arr.length; idx < len; idx += 1) {
arr[idx] = f.valueFromBytes(buf, off);
}
return arr;
},
bytesFromValue: function (arr, buf, off) {
arr || (arr = new Array(count));
buf || (buf = newBuffer(this.size));
off || (off = {bytes:0, bits:0});
for (var idx = 0, len = Math.min(arr.length, count); idx < len; idx += 1) {
f.bytesFromValue(arr[idx], buf, off);
}
while (idx++ < count) addField(off, f);
return buf;
}
}, ('width' in f) ? {width: f.width * count} : {size: f.size * count}) : f;
f2.pack = f2.bytesFromValue;
f2.unpack = f2.valueFromBytes;
return f2;
}
_.struct = function (name, fields, count) {
if (typeof name !== 'string') {
count = fields;
fields = name;
name = null;
}
var _size = {bytes:0, bits:0},
_padsById = Object.create(null),
fieldsObj = fields.reduce(function (obj, f, i) {
if ('_padTo' in f) {
// HACK: we really should just make local copy of *all* fields
f._id || (f._id = 'id'+Math.random().toFixed(20).slice(2)); // WORKAROUND: https://github.com/tessel/runtime/issues/716
var _f = _padsById[f._id] = (_size.bits) ? {
width: 8*(f._padTo - _size.bytes) - _size.bits
} : {
size: f._padTo - _size.bytes
};
if (_f.width < 0 || _f.size < 0) {
var xtraMsg = (_size.bits) ? (" and "+_size.bits+" bits") : '';
throw Error("Invalid .padTo("+f._padTo+") field, struct is already "+_size.bytes+" byte(s)"+xtraMsg+"!");
}
f = _f;
}
else if (f._hoistFields) Object.keys(f._hoistFields).forEach(function (name) {
var _f = Object.create(f._hoistFields[name]);
if ('width' in _f) _f.offset = {bytes:_f.offset.bytes+_size.bytes, bits:_f.offset.bits};
else _f.offset += _size.bytes;
obj[name] = _f;
});
else if (f.name) {
f = Object.create(f); // local overrides
f.offset = ('width' in f) ? {bytes:_size.bytes,bits:_size.bits} : _size.bytes,
obj[f.name] = f;
}
addField(_size, f);
return obj;
}, {});
if (_size.bits) throw Error("Improperly aligned bitfield at end of struct: "+name);
return arrayizeField({
valueFromBytes: function (buf, off) {
off || (off = {bytes:0, bits:0});
var obj = new Object();
fields.forEach(function (f) {
if ('_padTo' in f) return addField(off, _padsById[f._id]);
var value = f.valueFromBytes(buf, off);
if (f.name) obj[f.name] = value;
else if (typeof value === 'object') extend(obj, value);
});
return obj;
},
bytesFromValue: function (obj, buf, off) {
obj || (obj = {});
buf || (buf = newBuffer(this.size));
off || (off = {bytes:0, bits:0});
fields.forEach(function (f) {
if ('_padTo' in f) return addField(off, _padsById[f._id]);
var value = (f.name) ? obj[f.name] : obj;
f.bytesFromValue(value, buf, off);
});
return buf;
},
_hoistFields: (!name) ? fieldsObj : null,
fields: fieldsObj,
size: _size.bytes,
name: name
}, count);
};
_.padTo = function (off) {
return {_padTo:off};
};
// NOTE: bitfields must be embedded in a struct (C/C++ share this limitation)
var FULL = 0xFFFFFFFF;
function bitfield(name, width, count) {
width || (width = 1);
// NOTE: width limitation is so all values will align *within* a 4-byte word
if (width > 24) throw Error("Bitfields support a maximum width of 24 bits.");
var impl = this,
mask = FULL >>> (32 - width);
return arrayizeField({
valueFromBytes: function (buf, off) {
off || (off = {bytes:0, bits:0});
var end = (off.bits || 0) + width,
word = truncatedReadUInt32BE(buf, off.bytes) || 0,
over = word >>> (32 - end);
addField(off, this);
return impl.b2v.call(this, over & mask);
},
bytesFromValue: function (val, buf, off) {
val = impl.v2b.call(this, val || 0);
off || (off = {bytes:0, bits:0});
var end = (off.bits || 0) + width,
word = truncatedReadUInt32BE(buf, off.bytes) || 0,
zero = mask << (32 - end),
over = (val & mask) << (32 - end);
word &= ~zero;
word |= over;
word >>>= 0; // WORKAROUND: https://github.com/tessel/runtime/issues/644
truncatedWriteUInt32BE(buf, off.bytes, word);
addField(off, this);
return buf;
},
width: width,
name: name
}, count);
}
function swapBits(n, w) {
var o = 0;
while (w--) {
o <<= 1;
o |= n & 1;
n >>>= 1;
}
return o;
}
_.bool = function (name, count) {
return bitfield.call({
b2v: function (b) { return Boolean(b); },
v2b: function (v) { return (v) ? FULL : 0; }
}, name, 1, count);
};
_.ubit = bitfield.bind({
b2v: function (b) { return b; },
v2b: function (v) { return v; }
});
_.ubitLE = bitfield.bind({
b2v: function (b) { return swapBits(b, this.width); },
v2b: function (v) { return swapBits(v, this.width); }
});
_.sbit = bitfield.bind({ // TODO: handle sign bit…
b2v: function (b) {
var m = 1 << (this.width-1),
s = b & m;
return (s) ? -(b &= ~m) : b;
},
v2b: function (v) {
var m = 1 << (this.width-1),
s = (v < 0);
return (s) ? (-v | m) : v;
}
});
function bytefield(name, size, count) {
if (typeof name !== 'string') {
count = size;
size = name;
name = null;
}
size = (typeof size === 'number') ? size : 1;
var impl = this;
return arrayizeField({
valueFromBytes: function (buf, off) {
off || (off = {bytes:0, bits:0});
var val = buf.slice(off.bytes, off.bytes+this.size);
addField(off, this);
return impl.b2v.call(this, val);
},
bytesFromValue: function (val, buf, off) {
off || (off = {bytes:0});
buf || (buf = newBuffer(this.size));
var blk = buf.slice(off.bytes, off.bytes+this.size),
len = impl.vTb.call(this, val, blk);
if (len < blk.length) blk.fill(0, len);
addField(off, this);
return buf;
},
size: size,
name: name
}, count);
}
// http://stackoverflow.com/a/7460958/72637
function swapBytesPairs(fromBuffer, toBuffer) {
toBuffer = toBuffer || fromBuffer
var l = fromBuffer.length;
for (var i = 1; i < l; i += 2) {
var a = fromBuffer[i - 1];
toBuffer[i - 1] = fromBuffer[i];
toBuffer[i] = a;
}
return toBuffer
}
_.byte = bytefield.bind({
b2v: function (b) { return b; },
vTb: function (v,b) { if (!v) return 0; v.copy(b); return v.length; }
});
_.char = bytefield.bind({
b2v: function (b) {
var v = b.toString('utf8'),
z = v.indexOf('\0');
return (~z) ? v.slice(0, z) : v;
},
vTb: function (v,b) {
v || (v = '');
return b.write(v, 'utf8');
}
});
_.char16le = bytefield.bind({
b2v: function (b) {
var v = b.toString('utf16le'),
z = v.indexOf('\0');
return (~z) ? v.slice(0, z) : v;
},
vTb: function (v,b) {
v || (v = '');
return b.write(v, 'utf16le');
}
});
_.char16be = bytefield.bind({
b2v: function (b) {
var temp = newBuffer(b.length);
swapBytesPairs(b, temp);
var v = temp.toString('utf16le'),
z = v.indexOf('\0');
return (~z) ? v.slice(0, z) : v;
},
vTb: function (v,b) {
v || (v = '');
var len = b.write(v, 'utf16le');
swapBytesPairs(b)
return len;
}
});
function standardField(sig, size) {
var read = 'read'+sig,
dump = 'write'+sig;
size || (size = +sig.match(/\d+/)[0] >> 3);
return function (name, count) {
if (typeof name !== 'string') {
count = name;
name = null;
}
return arrayizeField({
valueFromBytes: function (buf, off) {
off || (off = {bytes:0});
var val = buf[read](off.bytes);
addField(off, this);
return val;
},
bytesFromValue: function (val, buf, off) {
val || (val = 0);
buf || (buf = newBuffer(this.size));
off || (off = {bytes:0});
buf[dump](val, off.bytes);
addField(off, this);
return buf;
},
size: size,
name: name
}, count);
};
}
_.float32 = standardField('FloatBE',4);
_.float64 = standardField('DoubleBE',8);
_.float32le = standardField('FloatLE',4);
_.float64le = standardField('DoubleLE',8);
_.uint8 = standardField('UInt8');
_.uint16 = standardField('UInt16BE');
_.uint32 = standardField('UInt32BE');
_.uint16le = standardField('UInt16LE');
_.uint32le = standardField('UInt32LE');
_.int8 = standardField('Int8');
_.int16 = standardField('Int16BE');
_.int32 = standardField('Int32BE');
_.int16le = standardField('Int16LE');
_.int32le = standardField('Int32LE');
_.derive = function (orig, pack, unpack) {
return function (name, count) {
if (typeof name !== 'string') {
count = name;
name = null;
}
return arrayizeField(extend({
valueFromBytes: function (buf, off) {
return unpack(orig.valueFromBytes(buf, off));
},
bytesFromValue: function (val, buf, off) {
return orig.bytesFromValue(pack(val), buf, off);
},
name: name
}, ('width' in orig) ? {width:orig.width} : {size:orig.size}), count);
}
};
module.exports = _;
}).call(this,require("buffer").Buffer)
},{"buffer":8}],35:[function(require,module,exports){
(function (setImmediate,clearImmediate){
var nextTick = require('process/browser.js').nextTick;
var apply = Function.prototype.apply;
var slice = Array.prototype.slice;
var immediateIds = {};
var nextImmediateId = 0;
// DOM APIs, for completeness
exports.setTimeout = function() {
return new Timeout(apply.call(setTimeout, window, arguments), clearTimeout);
};
exports.setInterval = function() {
return new Timeout(apply.call(setInterval, window, arguments), clearInterval);
};
exports.clearTimeout =
exports.clearInterval = function(timeout) { timeout.close(); };
function Timeout(id, clearFn) {
this._id = id;
this._clearFn = clearFn;
}
Timeout.prototype.unref = Timeout.prototype.ref = function() {};
Timeout.prototype.close = function() {
this._clearFn.call(window, this._id);
};
// Does not start the time, just sets up the members needed.
exports.enroll = function(item, msecs) {
clearTimeout(item._idleTimeoutId);
item._idleTimeout = msecs;
};
exports.unenroll = function(item) {
clearTimeout(item._idleTimeoutId);
item._idleTimeout = -1;
};
exports._unrefActive = exports.active = function(item) {
clearTimeout(item._idleTimeoutId);
var msecs = item._idleTimeout;
if (msecs >= 0) {
item._idleTimeoutId = setTimeout(function onTimeout() {
if (item._onTimeout)
item._onTimeout();
}, msecs);
}
};
// That's not how node.js implements it but the exposed api is the same.
exports.setImmediate = typeof setImmediate === "function" ? setImmediate : function(fn) {
var id = nextImmediateId++;
var args = arguments.length < 2 ? false : slice.call(arguments, 1);
immediateIds[id] = true;
nextTick(function onNextTick() {
if (immediateIds[id]) {
// fn.call() is faster so we optimize for the common use-case
// @see http://jsperf.com/call-apply-segu
if (args) {
fn.apply(null, args);
} else {
fn.call(null);
}
// Prevent ids from leaking
exports.clearImmediate(id);
}
});
return id;
};
exports.clearImmediate = typeof clearImmediate === "function" ? clearImmediate : function(id) {
delete immediateIds[id];
};
}).call(this,require("timers").setImmediate,require("timers").clearImmediate)
},{"process/browser.js":17,"timers":35}],36:[function(require,module,exports){
(function (global){
/**
* Module exports.
*/
module.exports = deprecate;
/**
* Mark that a method should not be used.
* Returns a modified function which warns once by default.
*
* If `localStorage.noDeprecation = true` is set, then it is a no-op.
*
* If `localStorage.throwDeprecation = true` is set, then deprecated functions
* will throw an Error when invoked.
*
* If `localStorage.traceDeprecation = true` is set, then deprecated functions
* will invoke `console.trace()` instead of `console.error()`.
*
* @param {Function} fn - the function to deprecate
* @param {String} msg - the string to print to the console when `fn` is invoked
* @returns {Function} a new "deprecated" version of `fn`
* @api public
*/
function deprecate (fn, msg) {
if (config('noDeprecation')) {
return fn;
}
var warned = false;
function deprecated() {
if (!warned) {
if (config('throwDeprecation')) {
throw new Error(msg);
} else if (config('traceDeprecation')) {
console.trace(msg);
} else {
console.warn(msg);
}
warned = true;
}
return fn.apply(this, arguments);
}
return deprecated;
}
/**
* Checks `localStorage` for boolean values for the given `name`.
*
* @param {String} name
* @returns {Boolean}
* @api private
*/
function config (name) {
// accessing global.localStorage can trigger a DOMException in sandboxed iframes
try {
if (!global.localStorage) return false;
} catch (_) {
return false;
}
var val = global.localStorage[name];
if (null == val) return false;
return String(val).toLowerCase() === 'true';
}
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],37:[function(require,module,exports){
module.exports = function (obj) {
Array.prototype.slice.call(arguments, 1).forEach(function (ext) {
if (ext) Object.keys(ext).forEach(function (key) {
obj[key] = ext[key];
});
});
return obj;
};
},{}],38:[function(require,module,exports){
// see http://staff.washington.edu/dittrich/misc/fatgen103.pdf
// and http://www.cse.scu.edu/~tschwarz/COEN252_09/Lectures/FAT.html
var _ = require('struct-fu'),
__ = require("./helpers.js");
var bootBase = _.struct([
_.byte('jmpBoot', 3),
_.char('OEMName', 8),
_.uint16le('BytsPerSec'),
_.uint8('SecPerClus'),
_.uint16le('ResvdSecCnt'), // Rsvd in table, but Resvd in calcs…
_.uint8('NumFATs'),
_.uint16le('RootEntCnt'),
_.uint16le('TotSec16'),
_.uint8('Media'),
_.uint16le('FATSz16'),
_.uint16le('SecPerTrk'),
_.uint16le('NumHeads'),
_.uint32le('HiddSec'),
_.uint32le('TotSec32')
]);
var bootInfo = _.struct([
_.uint8('DrvNum'),
_.uint8('Reserved1'),
_.uint8('BootSig'),
_.uint32le('VolID'),
_.char('VolLab', 11),
_.char('FilSysType', 8)
]);
exports.boot16 = _.struct([
bootBase,
bootInfo
]);
exports.boot32 = _.struct([
bootBase,
_.uint32le('FATSz32'),
_.struct('ExtFlags', [
_.ubit('NumActiveFAT', 4),
_.ubit('_reserved1', 3),
_.bool('MirroredFAT'),
_.ubit('_reserved2', 8)
].reverse()),
_.struct('FSVer', [
_.uint8('Major'),
_.uint8('Minor')
]),
_.uint32le('RootClus'),
_.uint16le('FSInfo'),
_.uint16le('BkBootSec'),
_.byte('Reserved', 12),
bootInfo
]);
var _time = _.struct([
_.ubit('hours',5),
_.ubit('minutes',6),
_.ubit('seconds_2',5)
]), time = {
valueFromBytes: function (buf, off) {
off || (off = {bytes:0});
var _buf = __.bufferFrom([buf[off.bytes+1], buf[off.bytes+0]]),
val = _time.valueFromBytes(_buf);
off.bytes += this.size;
return val;
},
bytesFromValue: function (val, buf, off) {
val || (val = {hours:0, minutes:0, seconds_2:0});
buf || (buf = __.allocBuffer(this.size));
off || (off = {bytes:0});
var _buf = _time.bytesFromValue(val);
buf[off.bytes+1] = _buf[0];
buf[off.bytes+0] = _buf[1];
off.bytes += this.size;
return buf;
},
size: _time.size
};
var _date = _.struct([
_.ubit('year',7),
_.ubit('month',4),
_.ubit('day',5)
]), date = {
valueFromBytes: function (buf, off) {
off || (off = {bytes:0});
var _buf = __.bufferFrom([buf[off.bytes+1], buf[off.bytes+0]]),
val = _date.valueFromBytes(_buf);
off.bytes += this.size;
return val;
},
bytesFromValue: function (val, buf, off) {
val || (val = {year:0, month:0, day:0});
buf || (buf = __.allocBuffer(this.size));
off || (off = {bytes:0});
var _buf = _date.bytesFromValue(val);
buf[off.bytes+1] = _buf[0];
buf[off.bytes+0] = _buf[1];
off.bytes += this.size;
return buf;
},
size: _date.size
};
exports.dirEntry = _.struct([
_.struct('Name', [
_.char('filename',8),
_.char('extension',3)
]),
_.struct('Attr', [
_.bool('readonly'),
_.bool('hidden'),
_.bool('system'),
_.bool('volume_id'),
_.bool('directory'),
_.bool('archive'),
_.ubit('reserved', 2)
].reverse()),
_.byte('NTRes', 1),
_.uint8('CrtTimeTenth'),
_.struct('CrtTime', [time]),
_.struct('CrtDate', [date]),
_.struct('LstAccDate', [date]),
_.uint16le('FstClusHI'),
_.struct('WrtTime', [time]),
_.struct('WrtDate', [date]),
_.uint16le('FstClusLO'),
_.uint32le('FileSize')
]);
exports.entryDoneFlag = 0x00;
exports.entryFreeFlag = 0xE5;
exports.entryIsE5Flag = 0x05;
exports.dirEntry_simple = _.struct([
_.struct('Name', [
_.char('filename',8),
_.char('extension',3)
]),
_.padTo(exports.dirEntry.size)
/*
_.uint8('Attr_raw'),
_.byte('NTRes', 1),
_.byte('Crt_raw', 1+2+2),
_.byte('Lst_raw', 2),
_.uint16le('FstClusHI'),
_.byte('Wrt_raw', 2+2),
_.uint16le('FstClusLO'),
_.uint32le('FileSize')
*/
]);
exports.lastLongFlag = 0x40;
exports.longDirFlag = 0x0F;
exports.longDirEntry = _.struct([
_.uint8('Ord'),
_.char16le('Name1', 10),
_.uint8('Attr_raw'),
_.uint8('Type'),
_.uint8('Chksum'),
_.char16le('Name2', 12),
_.uint16le('FstClusLO'),
_.char16le('Name3', 4)
]);
if (exports.longDirEntry.size !== exports.dirEntry.size) throw Error("Structs ain't right!");
exports.fatField = {
'fat12': _.struct('Status', [
_.ubit('field0bc', 8),
_.ubit('field1c', 4),
_.ubit('field0a', 4),
_.ubit('field1ab', 8),
]),
'fat16': _.uint16le('Status'),
'fat32': _.uint32le('Status') // more properly this 4 bits reserved + uint28le
};
exports.fatPrefix = {
'fat12': 0xF00,
'fat16': 0xFF00,
'fat32': 0x0FFFFF00
};
exports.fatStat = {
free: 0x00,
_undef: 0x01,
rsvMin: 0xF0,
bad: 0xF7,
eofMin: 0xF8,
eof: 0xFF
};
exports._I = {
RUSR: 0400,
WUSR: 0200,
XUSR: 0100,
RGRP: 0040,
WGRP: 0020,
XGRP: 0010,
ROTH: 0004,
WOTH: 0002,
XOTH: 0001,
SUID: 04000,
SGID: 02000,
SVTX: 01000,
FDIR: 040000,
FREG: 0100000,
};
exports._I.RWXU = exports._I.RUSR | exports._I.WUSR | exports._I.XUSR;
exports._I.RWXG = exports._I.RGRP | exports._I.WGRP | exports._I.XGRP;
exports._I.RWXO = exports._I.ROTH | exports._I.WOTH | exports._I.XOTH;
exports._I._sss = exports._I.SUID | exports._I.SGID | exports._I.SVTX;
exports._I._chmoddable = exports._I.RWXU | exports._I.RWXG | exports._I.RWXO | exports._I._sss;
var _errors = {
IO: "Input/output error",
NOENT: "No such file or directory",
INVAL: "Invalid argument",
EXIST: "File exists",
NAMETOOLONG: "Filename too long",
NOSPC: "No space left on device",
NOSYS: "Function not supported",
ROFS: "ROFLCopter file system",
NOTDIR: "Not a directory",
BADF: "Bad file descriptor",
EXIST: "File exists",
ISDIR: "Is a directory",
ACCES: "Permission denied",
NOSYS: "Function not implemented",
_TODO: "Not implemented yet!"
};
exports.err = {};
Object.keys(_errors).forEach(function (sym) {
var msg = _errors[sym];
exports.err[sym] = function () {
var e = new Error(msg);
e.code = sym;
return e;
};
});
},{"./helpers.js":4,"struct-fu":34}],39:[function(require,module,exports){
var S = require("./structs.js"),
c = require("./chains.js"),
$ = require("./cache.js"),
_ = require("./helpers.js");
exports.init = function (volume, opts, bootSector) {
if (bootSector[510] !== 0x55 || bootSector[511] !== 0xAA) throw Error("Invalid volume signature!");
var isFAT16 = bootSector.readUInt16LE(S.boot16.fields['FATSz16'].offset),
bootStruct = (isFAT16) ? S.boot16 : S.boot32,
BS = bootStruct.valueFromBytes(bootSector);
_.log(_.log.DBG, "Boot sector info:", BS);
bootSector = null; // allow GC
if (!BS.BytsPerSec) throw Error("This looks like an ExFAT volume! (unsupported)");
else if (BS.BytsPerSec !== volume.sectorSize) throw Error("Sector size mismatch with FAT table.");
var FATSz = (isFAT16) ? BS.FATSz16 : BS.FATSz32,
rootDirSectors = Math.ceil((BS.RootEntCnt * 32) / BS.BytsPerSec),
firstDataSector = BS.ResvdSecCnt + (BS.NumFATs * FATSz) + rootDirSectors,
totSec = (BS.TotSec16) ? BS.TotSec16 : BS.TotSec32,
dataSec = totSec - firstDataSector,
countofClusters = Math.floor(dataSec / BS.SecPerClus);
// avoid corrupting sectors from other partitions or whatnot
if (totSec > volume.numSectors) throw Error("Volume size mismatch!");
var fatType;
if (countofClusters < 4085) {
fatType = 'fat12';
} else if (countofClusters < 65525) {
fatType = 'fat16';
} else {
fatType = 'fat32';
}
_.log(_.log.DBG, "rootDirSectors", rootDirSectors, "firstDataSector", firstDataSector, "countofClusters", countofClusters, "=>", fatType);
var vol = {};
vol.opts = opts;
vol._sectorSize = BS.BytsPerSec;
vol._sectorsPerCluster = BS.SecPerClus;
vol._firstSectorOfCluster = function (n) {
return firstDataSector + (n-2)*vol._sectorsPerCluster;
};
vol._makeCache = function () {
return $.wrapDriver(volume);
};
vol._readSectors = function (cache, secNum, dest, cb) {
if (typeof dest === 'function') {
cb = dest;
dest = _.allocBuffer(vol._sectorSize);
}
_.log(_.log.DBG, "vol._readSectors", secNum, dest.length);
if (secNum < volume.numSectors) cache.readSectors(secNum, dest, function (e) { cb(e, dest); });
else throw Error("Invalid sector number!");
};
vol._writeSectors = function (cache, secNum, data, cb) {
_.log(_.log.DBG, "vol._writeSectors", secNum, data.length);
// NOTE: these are internal assertions, public API will get proper `S.err`s
if (data.length % volume.sectorSize) throw Error("Buffer length not a multiple of sector size");
else if (opts.ro) throw Error("Read-only filesystem");
else if (secNum < volume.numSectors) cache.writeSectors(secNum, data, cb);
else throw Error("Invalid sector number!");
};
function fatInfoForCluster(n) {
var entryStruct = S.fatField[fatType],
FATOffset = (fatType === 'fat12') ? Math.floor(n/2) * entryStruct.size : n * entryStruct.size,
SecNum = BS.ResvdSecCnt + Math.floor(FATOffset / BS.BytsPerSec);
EntOffset = FATOffset % BS.BytsPerSec;
return {sector:SecNum-BS.ResvdSecCnt, offset:EntOffset, struct:entryStruct};
}
// TODO: all this FAT manipulation is crazy inefficient! needs read caching *and* write caching
// …the best place for cache might be in `volume` handler, though. add a `flush` method to that spec?
// TODO: how should we handle redundant FATs? mirror every write? just ignore completely? copy-on-eject?
var fatChain = c.sectorChain(vol, BS.ResvdSecCnt, FATSz);
fatChain.cacheAdvice = 'RANDOM';
vol.fetchFromFAT = function (clusterNum, cb) {
var info = fatInfoForCluster(clusterNum);
fatChain.readFromPosition(info, info.struct.size, function (e,n,d) {
if (e) return cb(e);
var status = info.struct.valueFromBytes(d), prefix;
if (fatType === 'fat12') {
if (clusterNum % 2) {
status = (status.field1ab << 4) + status.field1c;
} else {
status = (status.field0a << 8) + status.field0bc;
}
}
else if (fatType === 'fat32') {
status &= 0x0FFFFFFF;
}
var prefix = S.fatPrefix[fatType];
if (status === S.fatStat.free) cb(null, 'free');
else if (status === S.fatStat._undef) cb(null, '-invalid-');
else if (status > prefix+S.fatStat.eofMin) cb(null, 'eof');
else if (status === prefix+S.fatStat.bad) cb(null, 'bad');
else if (status > prefix+S.fatStat.rsvMin) cb(null, 'reserved');
else cb(null, status);
});
};
vol.storeToFAT = function (clusterNum, status, cb) {
if (typeof status === 'string') {
status = S.fatStat[status];
status += S.fatPrefix[fatType];
}
var info = fatInfoForCluster(clusterNum);
// TODO: technically fat32 needs to *preserve* the high 4 bits
if (fatType === 'fat12') fatChain.readFromPosition(info, info.struct.size, function (e,n,d) {
var value = info.struct.valueFromBytes(d);
if (clusterNum % 2) {
value.field1ab = status >>> 4;
value.field1c = status & 0x0F;
} else {
value.field0a = status >>> 8;
value.field0bc = status & 0xFF;
}
var entry = info.struct.bytesFromValue(value);
fatChain.writeToPosition(info, entry, cb);
}); else {
var entry = info.struct.bytesFromValue(status);
fatChain.writeToPosition(info, entry, cb);
}
};
vol.allocateInFAT = function (hint, cb) {
if (typeof hint === 'function') {
cb = hint;
hint = 2; // TODO: cache a better starting point?
}
function searchForFreeCluster(num, cb) {
if (num < countofClusters) vol.fetchFromFAT(num, function (e, status) {
if (e) cb(e);
else if (status === 'free') cb(null, num);
else searchForFreeCluster(num+1, cb);
}); else cb(S.err.NOSPC()); // TODO: try searching backwards from hint…
}
searchForFreeCluster(hint, function (e, clusterNum) {
if (e) cb(e);
else vol.storeToFAT(clusterNum, 'eof', cb.bind(null,null,clusterNum));
});
};
vol.rootDirectoryChain = (isFAT16) ?
c.sectorChain(vol, firstDataSector - rootDirSectors, rootDirSectors) :
c.clusterChain(vol, BS.RootClus);
vol.rootDirectoryChain.cacheAdvice = 'WILLNEED';
vol.chainForCluster = c.clusterChain.bind(c, vol);
vol.chainFromJSON = function (d) {
return ('numSectors' in d) ?
c.sectorChain(vol, d.firstSector, d.numSectors) :
c.clusterChain(vol, d.firstCluster);
};
return vol;
}
},{"./cache.js":1,"./chains.js":2,"./helpers.js":4,"./structs.js":38}]},{},[5])(5)
});
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