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August 15, 2016 18:03
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/* | |
Copyright (c) 2008 Fred Palmer fred.palmer_at_gmail.com | |
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. | |
*/ | |
function StringBuffer() | |
{ | |
this.buffer = []; | |
} | |
StringBuffer.prototype.append = function append(string) | |
{ | |
this.buffer.push(string); | |
return this; | |
}; | |
StringBuffer.prototype.toString = function toString() | |
{ | |
return this.buffer.join(""); | |
}; | |
var Base64 = | |
{ | |
codex : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=", | |
encode : function (input) | |
{ | |
var output = new StringBuffer(); | |
var enumerator = new Utf8EncodeEnumerator(input); | |
while (enumerator.moveNext()) | |
{ | |
var chr1 = enumerator.current; | |
enumerator.moveNext(); | |
var chr2 = enumerator.current; | |
enumerator.moveNext(); | |
var chr3 = enumerator.current; | |
var enc1 = chr1 >> 2; | |
var enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); | |
var enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); | |
var enc4 = chr3 & 63; | |
if (isNaN(chr2)) | |
{ | |
enc3 = enc4 = 64; | |
} | |
else if (isNaN(chr3)) | |
{ | |
enc4 = 64; | |
} | |
output.append(this.codex.charAt(enc1) + this.codex.charAt(enc2) + this.codex.charAt(enc3) + this.codex.charAt(enc4)); | |
} | |
return output.toString(); | |
}, | |
decode : function (input) | |
{ | |
var output = new StringBuffer(); | |
var enumerator = new Base64DecodeEnumerator(input); | |
while (enumerator.moveNext()) | |
{ | |
var charCode = enumerator.current; | |
if (charCode < 128) | |
output.append(String.fromCharCode(charCode)); | |
else if ((charCode > 191) && (charCode < 224)) | |
{ | |
enumerator.moveNext(); | |
var charCode2 = enumerator.current; | |
output.append(String.fromCharCode(((charCode & 31) << 6) | (charCode2 & 63))); | |
} | |
else | |
{ | |
enumerator.moveNext(); | |
var charCode2 = enumerator.current; | |
enumerator.moveNext(); | |
var charCode3 = enumerator.current; | |
output.append(String.fromCharCode(((charCode & 15) << 12) | ((charCode2 & 63) << 6) | (charCode3 & 63))); | |
} | |
} | |
return output.toString(); | |
} | |
} | |
function Utf8EncodeEnumerator(input) | |
{ | |
this._input = input; | |
this._index = -1; | |
this._buffer = []; | |
} | |
Utf8EncodeEnumerator.prototype = | |
{ | |
current: Number.NaN, | |
moveNext: function() | |
{ | |
if (this._buffer.length > 0) | |
{ | |
this.current = this._buffer.shift(); | |
return true; | |
} | |
else if (this._index >= (this._input.length - 1)) | |
{ | |
this.current = Number.NaN; | |
return false; | |
} | |
else | |
{ | |
var charCode = this._input.charCodeAt(++this._index); | |
// "\r\n" -> "\n" | |
// | |
if ((charCode == 13) && (this._input.charCodeAt(this._index + 1) == 10)) | |
{ | |
charCode = 10; | |
this._index += 2; | |
} | |
if (charCode < 128) | |
{ | |
this.current = charCode; | |
} | |
else if ((charCode > 127) && (charCode < 2048)) | |
{ | |
this.current = (charCode >> 6) | 192; | |
this._buffer.push((charCode & 63) | 128); | |
} | |
else | |
{ | |
this.current = (charCode >> 12) | 224; | |
this._buffer.push(((charCode >> 6) & 63) | 128); | |
this._buffer.push((charCode & 63) | 128); | |
} | |
return true; | |
} | |
} | |
} | |
function Base64DecodeEnumerator(input) | |
{ | |
this._input = input; | |
this._index = -1; | |
this._buffer = []; | |
} | |
Base64DecodeEnumerator.prototype = | |
{ | |
current: 64, | |
moveNext: function() | |
{ | |
if (this._buffer.length > 0) | |
{ | |
this.current = this._buffer.shift(); | |
return true; | |
} | |
else if (this._index >= (this._input.length - 1)) | |
{ | |
this.current = 64; | |
return false; | |
} | |
else | |
{ | |
var enc1 = Base64.codex.indexOf(this._input.charAt(++this._index)); | |
var enc2 = Base64.codex.indexOf(this._input.charAt(++this._index)); | |
var enc3 = Base64.codex.indexOf(this._input.charAt(++this._index)); | |
var enc4 = Base64.codex.indexOf(this._input.charAt(++this._index)); | |
var chr1 = (enc1 << 2) | (enc2 >> 4); | |
var chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); | |
var chr3 = ((enc3 & 3) << 6) | enc4; | |
this.current = chr1; | |
if (enc3 != 64) | |
this._buffer.push(chr2); | |
if (enc4 != 64) | |
this._buffer.push(chr3); | |
return true; | |
} | |
} | |
}; |
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