mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-22 16:35:14 +00:00
502 lines
16 KiB
JavaScript
502 lines
16 KiB
JavaScript
// Copyright (c) 2013 Pieroxy <pieroxy@pieroxy.net>
|
|
// This work is free. You can redistribute it and/or modify it
|
|
// under the terms of the WTFPL, Version 2
|
|
// For more information see LICENSE.txt or http://www.wtfpl.net/
|
|
//
|
|
// For more information, the home page:
|
|
// http://pieroxy.net/blog/pages/lz-string/testing.html
|
|
//
|
|
// LZ-based compression algorithm, version 1.4.4
|
|
var LZString = (function() {
|
|
|
|
// private property
|
|
var f = String.fromCharCode;
|
|
var keyStrBase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
|
|
var keyStrUriSafe = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-$";
|
|
var baseReverseDic = {};
|
|
|
|
function getBaseValue(alphabet, character) {
|
|
if (!baseReverseDic[alphabet]) {
|
|
baseReverseDic[alphabet] = {};
|
|
for (var i=0 ; i<alphabet.length ; i++) {
|
|
baseReverseDic[alphabet][alphabet.charAt(i)] = i;
|
|
}
|
|
}
|
|
return baseReverseDic[alphabet][character];
|
|
}
|
|
|
|
var LZString = {
|
|
compressToBase64 : function (input) {
|
|
if (input == null) return "";
|
|
var res = LZString._compress(input, 6, function(a){return keyStrBase64.charAt(a);});
|
|
switch (res.length % 4) { // To produce valid Base64
|
|
default: // When could this happen ?
|
|
case 0 : return res;
|
|
case 1 : return res+"===";
|
|
case 2 : return res+"==";
|
|
case 3 : return res+"=";
|
|
}
|
|
},
|
|
|
|
decompressFromBase64 : function (input) {
|
|
if (input == null) return "";
|
|
if (input == "") return null;
|
|
return LZString._decompress(input.length, 32, function(index) { return getBaseValue(keyStrBase64, input.charAt(index)); });
|
|
},
|
|
|
|
compressToUTF16 : function (input) {
|
|
if (input == null) return "";
|
|
return LZString._compress(input, 15, function(a){return f(a+32);}) + " ";
|
|
},
|
|
|
|
decompressFromUTF16: function (compressed) {
|
|
if (compressed == null) return "";
|
|
if (compressed == "") return null;
|
|
return LZString._decompress(compressed.length, 16384, function(index) { return compressed.charCodeAt(index) - 32; });
|
|
},
|
|
|
|
//compress into uint8array (UCS-2 big endian format)
|
|
compressToUint8Array: function (uncompressed) {
|
|
var compressed = LZString.compress(uncompressed);
|
|
var buf=new Uint8Array(compressed.length*2); // 2 bytes per character
|
|
|
|
for (var i=0, TotalLen=compressed.length; i<TotalLen; i++) {
|
|
var current_value = compressed.charCodeAt(i);
|
|
buf[i*2] = current_value >>> 8;
|
|
buf[i*2+1] = current_value % 256;
|
|
}
|
|
return buf;
|
|
},
|
|
|
|
//decompress from uint8array (UCS-2 big endian format)
|
|
decompressFromUint8Array:function (compressed) {
|
|
if (compressed===null || compressed===undefined){
|
|
return LZString.decompress(compressed);
|
|
} else {
|
|
var buf=new Array(compressed.length/2); // 2 bytes per character
|
|
for (var i=0, TotalLen=buf.length; i<TotalLen; i++) {
|
|
buf[i]=compressed[i*2]*256+compressed[i*2+1];
|
|
}
|
|
|
|
var result = [];
|
|
buf.forEach(function (c) {
|
|
result.push(f(c));
|
|
});
|
|
return LZString.decompress(result.join(''));
|
|
|
|
}
|
|
|
|
},
|
|
|
|
|
|
//compress into a string that is already URI encoded
|
|
compressToEncodedURIComponent: function (input) {
|
|
if (input == null) return "";
|
|
return LZString._compress(input, 6, function(a){return keyStrUriSafe.charAt(a);});
|
|
},
|
|
|
|
//decompress from an output of compressToEncodedURIComponent
|
|
decompressFromEncodedURIComponent:function (input) {
|
|
if (input == null) return "";
|
|
if (input == "") return null;
|
|
input = input.replace(/ /g, "+");
|
|
return LZString._decompress(input.length, 32, function(index) { return getBaseValue(keyStrUriSafe, input.charAt(index)); });
|
|
},
|
|
|
|
compress: function (uncompressed) {
|
|
return LZString._compress(uncompressed, 16, function(a){return f(a);});
|
|
},
|
|
_compress: function (uncompressed, bitsPerChar, getCharFromInt) {
|
|
if (uncompressed == null) return "";
|
|
var i, value,
|
|
context_dictionary= {},
|
|
context_dictionaryToCreate= {},
|
|
context_c="",
|
|
context_wc="",
|
|
context_w="",
|
|
context_enlargeIn= 2, // Compensate for the first entry which should not count
|
|
context_dictSize= 3,
|
|
context_numBits= 2,
|
|
context_data=[],
|
|
context_data_val=0,
|
|
context_data_position=0,
|
|
ii;
|
|
|
|
for (ii = 0; ii < uncompressed.length; ii += 1) {
|
|
context_c = uncompressed.charAt(ii);
|
|
if (!Object.prototype.hasOwnProperty.call(context_dictionary,context_c)) {
|
|
context_dictionary[context_c] = context_dictSize++;
|
|
context_dictionaryToCreate[context_c] = true;
|
|
}
|
|
|
|
context_wc = context_w + context_c;
|
|
if (Object.prototype.hasOwnProperty.call(context_dictionary,context_wc)) {
|
|
context_w = context_wc;
|
|
} else {
|
|
if (Object.prototype.hasOwnProperty.call(context_dictionaryToCreate,context_w)) {
|
|
if (context_w.charCodeAt(0)<256) {
|
|
for (i=0 ; i<context_numBits ; i++) {
|
|
context_data_val = (context_data_val << 1);
|
|
if (context_data_position == bitsPerChar-1) {
|
|
context_data_position = 0;
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
context_data_val = 0;
|
|
} else {
|
|
context_data_position++;
|
|
}
|
|
}
|
|
value = context_w.charCodeAt(0);
|
|
for (i=0 ; i<8 ; i++) {
|
|
context_data_val = (context_data_val << 1) | (value&1);
|
|
if (context_data_position == bitsPerChar-1) {
|
|
context_data_position = 0;
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
context_data_val = 0;
|
|
} else {
|
|
context_data_position++;
|
|
}
|
|
value = value >> 1;
|
|
}
|
|
} else {
|
|
value = 1;
|
|
for (i=0 ; i<context_numBits ; i++) {
|
|
context_data_val = (context_data_val << 1) | value;
|
|
if (context_data_position ==bitsPerChar-1) {
|
|
context_data_position = 0;
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
context_data_val = 0;
|
|
} else {
|
|
context_data_position++;
|
|
}
|
|
value = 0;
|
|
}
|
|
value = context_w.charCodeAt(0);
|
|
for (i=0 ; i<16 ; i++) {
|
|
context_data_val = (context_data_val << 1) | (value&1);
|
|
if (context_data_position == bitsPerChar-1) {
|
|
context_data_position = 0;
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
context_data_val = 0;
|
|
} else {
|
|
context_data_position++;
|
|
}
|
|
value = value >> 1;
|
|
}
|
|
}
|
|
context_enlargeIn--;
|
|
if (context_enlargeIn == 0) {
|
|
context_enlargeIn = Math.pow(2, context_numBits);
|
|
context_numBits++;
|
|
}
|
|
delete context_dictionaryToCreate[context_w];
|
|
} else {
|
|
value = context_dictionary[context_w];
|
|
for (i=0 ; i<context_numBits ; i++) {
|
|
context_data_val = (context_data_val << 1) | (value&1);
|
|
if (context_data_position == bitsPerChar-1) {
|
|
context_data_position = 0;
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
context_data_val = 0;
|
|
} else {
|
|
context_data_position++;
|
|
}
|
|
value = value >> 1;
|
|
}
|
|
|
|
|
|
}
|
|
context_enlargeIn--;
|
|
if (context_enlargeIn == 0) {
|
|
context_enlargeIn = Math.pow(2, context_numBits);
|
|
context_numBits++;
|
|
}
|
|
// Add wc to the dictionary.
|
|
context_dictionary[context_wc] = context_dictSize++;
|
|
context_w = String(context_c);
|
|
}
|
|
}
|
|
|
|
// Output the code for w.
|
|
if (context_w !== "") {
|
|
if (Object.prototype.hasOwnProperty.call(context_dictionaryToCreate,context_w)) {
|
|
if (context_w.charCodeAt(0)<256) {
|
|
for (i=0 ; i<context_numBits ; i++) {
|
|
context_data_val = (context_data_val << 1);
|
|
if (context_data_position == bitsPerChar-1) {
|
|
context_data_position = 0;
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
context_data_val = 0;
|
|
} else {
|
|
context_data_position++;
|
|
}
|
|
}
|
|
value = context_w.charCodeAt(0);
|
|
for (i=0 ; i<8 ; i++) {
|
|
context_data_val = (context_data_val << 1) | (value&1);
|
|
if (context_data_position == bitsPerChar-1) {
|
|
context_data_position = 0;
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
context_data_val = 0;
|
|
} else {
|
|
context_data_position++;
|
|
}
|
|
value = value >> 1;
|
|
}
|
|
} else {
|
|
value = 1;
|
|
for (i=0 ; i<context_numBits ; i++) {
|
|
context_data_val = (context_data_val << 1) | value;
|
|
if (context_data_position == bitsPerChar-1) {
|
|
context_data_position = 0;
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
context_data_val = 0;
|
|
} else {
|
|
context_data_position++;
|
|
}
|
|
value = 0;
|
|
}
|
|
value = context_w.charCodeAt(0);
|
|
for (i=0 ; i<16 ; i++) {
|
|
context_data_val = (context_data_val << 1) | (value&1);
|
|
if (context_data_position == bitsPerChar-1) {
|
|
context_data_position = 0;
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
context_data_val = 0;
|
|
} else {
|
|
context_data_position++;
|
|
}
|
|
value = value >> 1;
|
|
}
|
|
}
|
|
context_enlargeIn--;
|
|
if (context_enlargeIn == 0) {
|
|
context_enlargeIn = Math.pow(2, context_numBits);
|
|
context_numBits++;
|
|
}
|
|
delete context_dictionaryToCreate[context_w];
|
|
} else {
|
|
value = context_dictionary[context_w];
|
|
for (i=0 ; i<context_numBits ; i++) {
|
|
context_data_val = (context_data_val << 1) | (value&1);
|
|
if (context_data_position == bitsPerChar-1) {
|
|
context_data_position = 0;
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
context_data_val = 0;
|
|
} else {
|
|
context_data_position++;
|
|
}
|
|
value = value >> 1;
|
|
}
|
|
|
|
|
|
}
|
|
context_enlargeIn--;
|
|
if (context_enlargeIn == 0) {
|
|
context_enlargeIn = Math.pow(2, context_numBits);
|
|
context_numBits++;
|
|
}
|
|
}
|
|
|
|
// Mark the end of the stream
|
|
value = 2;
|
|
for (i=0 ; i<context_numBits ; i++) {
|
|
context_data_val = (context_data_val << 1) | (value&1);
|
|
if (context_data_position == bitsPerChar-1) {
|
|
context_data_position = 0;
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
context_data_val = 0;
|
|
} else {
|
|
context_data_position++;
|
|
}
|
|
value = value >> 1;
|
|
}
|
|
|
|
// Flush the last char
|
|
while (true) {
|
|
context_data_val = (context_data_val << 1);
|
|
if (context_data_position == bitsPerChar-1) {
|
|
context_data.push(getCharFromInt(context_data_val));
|
|
break;
|
|
}
|
|
else context_data_position++;
|
|
}
|
|
return context_data.join('');
|
|
},
|
|
|
|
decompress: function (compressed) {
|
|
if (compressed == null) return "";
|
|
if (compressed == "") return null;
|
|
return LZString._decompress(compressed.length, 32768, function(index) { return compressed.charCodeAt(index); });
|
|
},
|
|
|
|
_decompress: function (length, resetValue, getNextValue) {
|
|
var dictionary = [],
|
|
next,
|
|
enlargeIn = 4,
|
|
dictSize = 4,
|
|
numBits = 3,
|
|
entry = "",
|
|
result = [],
|
|
i,
|
|
w,
|
|
bits, resb, maxpower, power,
|
|
c,
|
|
data = {val:getNextValue(0), position:resetValue, index:1};
|
|
|
|
for (i = 0; i < 3; i += 1) {
|
|
dictionary[i] = i;
|
|
}
|
|
|
|
bits = 0;
|
|
maxpower = Math.pow(2,2);
|
|
power=1;
|
|
while (power!=maxpower) {
|
|
resb = data.val & data.position;
|
|
data.position >>= 1;
|
|
if (data.position == 0) {
|
|
data.position = resetValue;
|
|
data.val = getNextValue(data.index++);
|
|
}
|
|
bits |= (resb>0 ? 1 : 0) * power;
|
|
power <<= 1;
|
|
}
|
|
|
|
switch (next = bits) {
|
|
case 0:
|
|
bits = 0;
|
|
maxpower = Math.pow(2,8);
|
|
power=1;
|
|
while (power!=maxpower) {
|
|
resb = data.val & data.position;
|
|
data.position >>= 1;
|
|
if (data.position == 0) {
|
|
data.position = resetValue;
|
|
data.val = getNextValue(data.index++);
|
|
}
|
|
bits |= (resb>0 ? 1 : 0) * power;
|
|
power <<= 1;
|
|
}
|
|
c = f(bits);
|
|
break;
|
|
case 1:
|
|
bits = 0;
|
|
maxpower = Math.pow(2,16);
|
|
power=1;
|
|
while (power!=maxpower) {
|
|
resb = data.val & data.position;
|
|
data.position >>= 1;
|
|
if (data.position == 0) {
|
|
data.position = resetValue;
|
|
data.val = getNextValue(data.index++);
|
|
}
|
|
bits |= (resb>0 ? 1 : 0) * power;
|
|
power <<= 1;
|
|
}
|
|
c = f(bits);
|
|
break;
|
|
case 2:
|
|
return "";
|
|
}
|
|
dictionary[3] = c;
|
|
w = c;
|
|
result.push(c);
|
|
while (true) {
|
|
if (data.index > length) {
|
|
return "";
|
|
}
|
|
|
|
bits = 0;
|
|
maxpower = Math.pow(2,numBits);
|
|
power=1;
|
|
while (power!=maxpower) {
|
|
resb = data.val & data.position;
|
|
data.position >>= 1;
|
|
if (data.position == 0) {
|
|
data.position = resetValue;
|
|
data.val = getNextValue(data.index++);
|
|
}
|
|
bits |= (resb>0 ? 1 : 0) * power;
|
|
power <<= 1;
|
|
}
|
|
|
|
switch (c = bits) {
|
|
case 0:
|
|
bits = 0;
|
|
maxpower = Math.pow(2,8);
|
|
power=1;
|
|
while (power!=maxpower) {
|
|
resb = data.val & data.position;
|
|
data.position >>= 1;
|
|
if (data.position == 0) {
|
|
data.position = resetValue;
|
|
data.val = getNextValue(data.index++);
|
|
}
|
|
bits |= (resb>0 ? 1 : 0) * power;
|
|
power <<= 1;
|
|
}
|
|
|
|
dictionary[dictSize++] = f(bits);
|
|
c = dictSize-1;
|
|
enlargeIn--;
|
|
break;
|
|
case 1:
|
|
bits = 0;
|
|
maxpower = Math.pow(2,16);
|
|
power=1;
|
|
while (power!=maxpower) {
|
|
resb = data.val & data.position;
|
|
data.position >>= 1;
|
|
if (data.position == 0) {
|
|
data.position = resetValue;
|
|
data.val = getNextValue(data.index++);
|
|
}
|
|
bits |= (resb>0 ? 1 : 0) * power;
|
|
power <<= 1;
|
|
}
|
|
dictionary[dictSize++] = f(bits);
|
|
c = dictSize-1;
|
|
enlargeIn--;
|
|
break;
|
|
case 2:
|
|
return result.join('');
|
|
}
|
|
|
|
if (enlargeIn == 0) {
|
|
enlargeIn = Math.pow(2, numBits);
|
|
numBits++;
|
|
}
|
|
|
|
if (dictionary[c]) {
|
|
entry = dictionary[c];
|
|
} else {
|
|
if (c === dictSize) {
|
|
entry = w + w.charAt(0);
|
|
} else {
|
|
return null;
|
|
}
|
|
}
|
|
result.push(entry);
|
|
|
|
// Add w+entry[0] to the dictionary.
|
|
dictionary[dictSize++] = w + entry.charAt(0);
|
|
enlargeIn--;
|
|
|
|
w = entry;
|
|
|
|
if (enlargeIn == 0) {
|
|
enlargeIn = Math.pow(2, numBits);
|
|
numBits++;
|
|
}
|
|
|
|
}
|
|
}
|
|
};
|
|
return LZString;
|
|
})();
|
|
|
|
if (typeof define === 'function' && define.amd) {
|
|
define(function () { return LZString; });
|
|
} else if( typeof module !== 'undefined' && module != null ) {
|
|
module.exports = LZString
|
|
}
|