mirror of
https://github.com/classilla/tenfourfox.git
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105 lines
2.6 KiB
JavaScript
105 lines
2.6 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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module.metadata = {
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"stability": "experimental"
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};
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exports.ByteReader = ByteReader;
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exports.ByteWriter = ByteWriter;
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const {Cc, Ci} = require("chrome");
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// This just controls the maximum number of bytes we read in at one time.
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const BUFFER_BYTE_LEN = 0x8000;
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function ByteReader(inputStream) {
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const self = this;
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let stream = Cc["@mozilla.org/binaryinputstream;1"].
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createInstance(Ci.nsIBinaryInputStream);
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stream.setInputStream(inputStream);
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let manager = new StreamManager(this, stream);
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this.read = function ByteReader_read(numBytes) {
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manager.ensureOpened();
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if (typeof(numBytes) !== "number")
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numBytes = Infinity;
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let data = "";
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let read = 0;
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try {
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while (true) {
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let avail = stream.available();
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let toRead = Math.min(numBytes - read, avail, BUFFER_BYTE_LEN);
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if (toRead <= 0)
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break;
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data += stream.readBytes(toRead);
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read += toRead;
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}
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}
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catch (err) {
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throw new Error("Error reading from stream: " + err);
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}
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return data;
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};
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}
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function ByteWriter(outputStream) {
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const self = this;
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let stream = Cc["@mozilla.org/binaryoutputstream;1"].
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createInstance(Ci.nsIBinaryOutputStream);
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stream.setOutputStream(outputStream);
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let manager = new StreamManager(this, stream);
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this.write = function ByteWriter_write(str) {
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manager.ensureOpened();
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try {
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stream.writeBytes(str, str.length);
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}
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catch (err) {
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throw new Error("Error writing to stream: " + err);
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}
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};
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}
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// This manages the lifetime of stream, a ByteReader or ByteWriter. It defines
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// closed and close() on stream and registers an unload listener that closes
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// rawStream if it's still opened. It also provides ensureOpened(), which
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// throws an exception if the stream is closed.
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function StreamManager(stream, rawStream) {
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const self = this;
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this.rawStream = rawStream;
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this.opened = true;
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stream.__defineGetter__("closed", function stream_closed() {
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return !self.opened;
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});
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stream.close = function stream_close() {
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self.ensureOpened();
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self.unload();
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};
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require("../system/unload").ensure(this);
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}
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StreamManager.prototype = {
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ensureOpened: function StreamManager_ensureOpened() {
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if (!this.opened)
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throw new Error("The stream is closed and cannot be used.");
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},
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unload: function StreamManager_unload() {
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this.rawStream.close();
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this.opened = false;
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}
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};
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