apple2js/js/util.js

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/* Copyright 2010-2019 Will Scullin <scullin@scullinsteel.com>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
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/*eslint no-console: 0*/
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var hex_digits = '0123456789ABCDEF';
var bin_digits = '01';
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export function allocMem(size) {
function garbage() {
return (Math.random() * 0x100) & 0xff;
}
var result;
if (window.Uint8Array) {
result = new Uint8Array(size);
} else {
result = new Array(size);
}
var idx;
for (idx = 0; idx < size; idx++) {
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result[idx] = (idx & 0x02) ? 0x00 : 0xff;
}
// Borrowed from AppleWin (https://github.com/AppleWin/AppleWin)
for(idx = 0; idx < size; idx += 0x200 ) {
result[idx + 0x28] = garbage();
result[idx + 0x29] = garbage();
result[idx + 0x68] = garbage();
result[idx + 0x69] = garbage();
}
return result;
}
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export function allocMemPages(pages) {
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return allocMem(pages << 8);
}
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export function bytify(ary) {
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var result = ary;
if (window.Uint8Array) {
result = new Uint8Array(ary);
}
return result;
}
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export function debug() {
console.log.apply(console, arguments);
}
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export function toHex(v, n) {
if (!n) {
n = v < 256 ? 2 : 4;
}
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var result = '';
for (var idx = 0; idx < n; idx++) {
result = hex_digits[v & 0x0f] + result;
v >>= 4;
}
return result;
}
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export function toBinary(v) {
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var result = '';
for (var idx = 0; idx < 8; idx++) {
result = bin_digits[v & 0x01] + result;
v >>= 1;
}
return result;
}
// From http://www.netlobo.com/url_query_string_javascript.html
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export function gup( name )
{
name = name.replace(/[[]/,'\\[').replace(/[\]]/,'\\]');
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var regexS = '[\\?&]'+name+'=([^&#]*)';
var regex = new RegExp( regexS );
var results = regex.exec( window.location.href );
if( !results )
return '';
else
return results[1];
}
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export function hup() {
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var regex = new RegExp('#(.*)');
var results = regex.exec(window.location.hash);
if ( !results )
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return '';
else
return results[1];
}
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export function numToString(num) {
let result = '';
for (let idx = 0; idx < 4; idx++) {
result += String.fromCharCode(num & 0xff);
num >>= 8;
}
return result;
}