367 lines
12 KiB
JavaScript
367 lines
12 KiB
JavaScript
'use strict';
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/*@
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Ox.encodeBase26 <b> Encode a number as bijective base26
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See <a href="http://en.wikipedia.org/wiki/Bijective_numeration">
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Bijective numeration</a>.
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> Ox.encodeBase26(0)
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''
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> Ox.encodeBase26(1)
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'A'
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> Ox.encodeBase26(26)
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'Z'
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> Ox.encodeBase26(27)
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'AA'
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> Ox.encodeBase26(4461)
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'FOO'
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@*/
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Ox.encodeBase26 = function(number) {
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var string = '';
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while (number) {
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string = String.fromCharCode(65 + (number - 1) % 26) + string;
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number = Math.floor((number - 1) / 26);
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}
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return string;
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};
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/*@
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Ox.decodeBase26 <f> Decodes a bijective base26-encoded number
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See <a href="http://en.wikipedia.org/wiki/Bijective_numeration">
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Bijective numeration</a>.
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> Ox.decodeBase26('foo')
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4461
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@*/
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Ox.decodeBase26 = function(string) {
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return string.toUpperCase().split('').reverse().reduce(function(p, c, i) {
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return p + (c.charCodeAt(0) - 64) * Math.pow(26, i);
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}, 0);
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};
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/*@
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Ox.encodeBase32 <b> Encode a number as base32
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See <a href="http://www.crockford.com/wrmg/base32.html">Base 32</a>.
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> Ox.encodeBase32(15360)
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'F00'
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> Ox.encodeBase32(33819)
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'110V'
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@*/
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Ox.encodeBase32 = function(number) {
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return Ox.map(number.toString(32), function(char) {
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return Ox.BASE_32_DIGITS[parseInt(char, 32)];
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});
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};
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/*@
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Ox.decodeBase32 <f> Decodes a base32-encoded number
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See <a href="http://www.crockford.com/wrmg/base32.html">Base 32</a>.
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> Ox.decodeBase32('foo')
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15360
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> Ox.decodeBase32('ILOU')
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33819
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> Ox.decodeBase32('?').toString()
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'NaN'
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@*/
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Ox.decodeBase32 = function(string) {
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return parseInt(Ox.map(string.toUpperCase(), function(char) {
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var index = Ox.BASE_32_DIGITS.indexOf(
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Ox.BASE_32_ALIASES[char] || char
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);
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return index == -1 ? ' ' : index.toString(32);
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}), 32);
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};
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/*@
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Ox.encodeBase64 <f> Encode a number as base64
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> Ox.encodeBase64(32394)
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'foo'
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@*/
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Ox.encodeBase64 = function(number) {
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return btoa(Ox.encodeBase256(number)).replace(/=/g, '');
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};
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/*@
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Ox.decodeBase64 <f> Decodes a base64-encoded number
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> Ox.decodeBase64('foo')
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32394
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@*/
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Ox.decodeBase64 = function(string) {
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return Ox.decodeBase256(atob(string));
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};
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/*@
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Ox.encodeBase128 <f> Encode a number as base128
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> Ox.encodeBase128(1685487)
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'foo'
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@*/
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Ox.encodeBase128 = function(number) {
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var string = '';
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while (number) {
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string = Ox.char(number & 127) + string;
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number >>= 7;
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}
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return string;
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};
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/*@
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Ox.decodeBase128 <f> Decode a base128-encoded number
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> Ox.decodeBase128('foo')
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1685487
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@*/
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Ox.decodeBase128 = function(string) {
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return string.split('').reverse().reduce(function(p, c, i) {
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return p + (c.charCodeAt(0) << i * 7);
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}, 0);
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};
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/*@
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Ox.encodeBase256 <f> Encode a number as base256
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> Ox.encodeBase256(6713199)
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'foo'
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@*/
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Ox.encodeBase256 = function(number) {
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var string = '';
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while (number) {
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string = Ox.char(number & 255) + string;
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number >>= 8;
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}
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return string;
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};
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/*@
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Ox.decodeBase256 <f> Decode a base256-encoded number
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> Ox.decodeBase256('foo')
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6713199
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@*/
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Ox.decodeBase256 = function(string) {
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return string.split('').reverse().reduce(function(p, c, i) {
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return p + (c.charCodeAt(0) << i * 8);
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}, 0);
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};
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/*@
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Ox.encodeDeflate <f> Encodes a string, using deflate
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Since PNGs are deflate-encoded, the `canvas` object's `toDataURL` method
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provides an efficient implementation. The string is encoded as UTF-8 and
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written to the RGB channels of a canvas element, then the PNG dataURL is
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decoded from base64, and some head, tail and chunk names are removed.
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(str) -> <s> The encoded string
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str <s> The string to be encoded
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> Ox.decodeDeflate(Ox.encodeDeflate('foo'), function(str) { Ox.test(str, 'foo'); })
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undefined
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@*/
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Ox.encodeDeflate = function(string, callback) {
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// Make sure we can encode the full unicode range of characters.
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string = Ox.encodeUTF8(string);
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// We can only safely write to RGB, so we need 1 pixel for 3 bytes.
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// The string length may not be a multiple of 3, so we need to encode
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// the number of padding bytes (1 byte), the string, and non-0-bytes
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// as padding, so that the combined length becomes a multiple of 3.
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var length = 1 + string.length, c = Ox.canvas(Math.ceil(length / 3), 1),
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data, idat, pad = (3 - length % 3) % 3;
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string = Ox.char(pad) + string + Ox.repeat('\u00FF', pad);
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Ox.loop(c.data.length, function(i) {
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// Write character codes into RGB, and 255 into ALPHA
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c.data[i] = i % 4 < 3 ? string.charCodeAt(i - parseInt(i / 4)) : 255;
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});
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c.context.putImageData(c.imageData, 0, 0);
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// Get the PNG data from the data URL and decode it from base64.
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string = atob(c.canvas.toDataURL().split(',')[1]);
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// Discard bytes 0 to 15 (8 bytes PNG signature, 4 bytes IHDR length, 4
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// bytes IHDR name), keep bytes 16 to 19 (width), discard bytes 20 to 29
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// (4 bytes height, 5 bytes flags), keep bytes 29 to 32 (IHDR checksum),
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// keep the rest (IDAT chunks), discard the last 12 bytes (IEND chunk).
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data = string.slice(16, 20) + string.slice(29, 33);
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idat = string.slice(33, -12);
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while (idat) {
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// Each IDAT chunk is 4 bytes length, 4 bytes name, length bytes
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// data and 4 bytes checksum. We can discard the name parts.
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length = idat.slice(0, 4);
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data += length + idat.slice(8, 12 + (
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length = Ox.decodeBase256(length)
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));
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idat = idat.slice(12 + length);
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}
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// Allow for async use, symmetrical to Ox.decodeDeflate
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callback && callback(data);
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return data;
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};
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/*@
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Ox.decodeDeflate <f> Decodes an deflate-encoded string
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Since PNGs are deflate-encoded, the `canvas` object's `drawImage` method
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provides an efficient implementation. The string will be wrapped as a PNG
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dataURL, encoded as base64, and drawn onto a canvas element, then the RGB
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channels will be read, and the result will be decoded from UTF8.
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(str) -> <u> undefined
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str <s> The string to be decoded
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callback <f> Callback function
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str <s> The decoded string
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@*/
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Ox.decodeDeflate = function(string, callback) {
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var image = new Image(),
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// PNG file signature and IHDR chunk
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data = '\u0089PNG\r\n\u001A\n\u0000\u0000\u0000\u000DIHDR'
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+ string.slice(0, 4) + '\u0000\u0000\u0000\u0001'
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+ '\u0008\u0006\u0000\u0000\u0000' + string.slice(4, 8),
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// IDAT chunks
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idat = string.slice(8), length;
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function error() {
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throw new RangeError('Deflate codec can\'t decode data.');
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}
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while (idat) {
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// Reinsert the IDAT chunk names
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length = idat.slice(0, 4);
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data += length + 'IDAT' + idat.slice(4, 8 + (
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length = Ox.decodeBase256(length)
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));
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idat = idat.slice(8 + length);
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}
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// IEND chunk
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data += '\u0000\u0000\u0000\u0000IEND\u00AE\u0042\u0060\u0082';
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// Unfortunately, we can't synchronously set the source of an image,
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// draw it onto a canvas, and read its data.
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image.onload = function() {
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string = Ox.slice(Ox.canvas(image).data).map(function(value, index) {
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// Read one character per RGB byte, ignore ALPHA.
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return index % 4 < 3 ? Ox.char(value) : '';
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}).join('');
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try {
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// Parse the first byte as number of bytes to chop at the end,
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// and the rest, without these bytes, as an UTF8-encoded string.
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string = Ox.decodeUTF8(
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string.slice(1, -string.charCodeAt(0) || void 0)
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);
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} catch (e) {
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error();
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}
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callback(string);
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};
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image.onerror = error;
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image.src = 'data:image/png;base64,' + btoa(data);
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};
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(function() {
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function replace(string) {
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return string.replace(/%(?![0-9A-Fa-f]{2})/g, '%25')
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.replace(/(%[0-9A-Fa-f]{2})+/g, function(match) {
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var hex = match.split('%').slice(1), ret;
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Ox.forEach(Ox.range(1, hex.length + 1), function(length) {
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var string = Ox.range(length).map(function(i) {
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return Ox.char(parseInt(hex[i], 16));
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}).join('');
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try {
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Ox.decodeUTF8(string);
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ret = match.slice(0, length * 3)
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+ replace(match.slice(length * 3));
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return false;
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} catch(e) {}
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});
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return ret || '%25' + hex[0] + replace(match.slice(3));
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});
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}
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/*@
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Ox.decodeURI <f> Decodes URI
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Unlike window.decodeURI, this doesn't throw on trailing '%'.
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(string) -> <s> Decoded string
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@*/
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Ox.decodeURI = function(string) {
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return decodeURI(replace(string));
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};
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/*@
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Ox.decodeURIComponent <f> Decodes URI component
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Unlike window.decodeURIComponent, this doesn't throw on trailing '%'.
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(string) -> <s> Decoded string
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@*/
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Ox.decodeURIComponent = function(string) {
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return decodeURIComponent(replace(string));
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};
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}());
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/*@
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Ox.encodeUTF8 <f> Encodes a string as UTF-8
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see http://en.wikipedia.org/wiki/UTF-8
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(string) -> <s> UTF-8 encoded string
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string <s> Any string
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> Ox.encodeUTF8("YES")
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"YES"
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> Ox.encodeUTF8("¥€$")
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"\u00C2\u00A5\u00E2\u0082\u00AC\u0024"
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@*/
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Ox.encodeUTF8 = function(string) {
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return Ox.map(string, function(char) {
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var code = char.charCodeAt(0),
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string = '';
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if (code < 128) {
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string = char;
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} else if (code < 2048) {
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string = String.fromCharCode(code >> 6 | 192)
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+ String.fromCharCode(code & 63 | 128);
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} else {
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string = String.fromCharCode(code >> 12 | 224)
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+ String.fromCharCode(code >> 6 & 63 | 128)
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+ String.fromCharCode(code & 63 | 128);
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}
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return string;
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});
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};
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/*@
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Ox.decodeUTF8 <f> Decodes an UTF-8-encoded string
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see http://en.wikipedia.org/wiki/UTF-8
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(utf8) -> <s> string
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utf8 <s> Any UTF-8-encoded string
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> Ox.decodeUTF8('YES')
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'YES'
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> Ox.decodeUTF8('\u00C2\u00A5\u00E2\u0082\u00AC\u0024')
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'¥€$'
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@*/
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Ox.decodeUTF8 = function(string) {
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var code, i = 0, length = string.length, ret = '';
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function error(byte, position) {
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throw new RangeError(
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'UTF-8 codec can\'t decode byte 0x' +
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byte.toString(16).toUpperCase() + ' at position ' + position
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);
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}
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while (i < length) {
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code = [
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string.charCodeAt(i),
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string.charCodeAt(i + 1),
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string.charCodeAt(i + 2)
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];
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if (code[0] < 128) {
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ret += string[i];
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i++;
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} else if (
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code[0] >= 192 && code[0] < 240
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&& i < length - (code[0] < 224 ? 1 : 2)
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) {
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if (code[1] >= 128 && code[1] < 192) {
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if (code[0] < 224) {
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ret += String.fromCharCode(
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(code[0] & 31) << 6 | code[1] & 63
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);
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i += 2;
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} else if (code[2] >= 128 && code[2] < 192) {
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ret += String.fromCharCode(
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(code[0] & 15) << 12 | (code[1] & 63) << 6
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| code[2] & 63
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);
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i += 3;
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} else {
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error(code[2], i + 2);
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}
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} else {
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error(code[1], i + 1);
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}
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} else {
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error(code[0], i);
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}
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}
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return ret;
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};
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