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Base64.js
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Text File
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2010-01-28
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4KB
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152 lines
/**
*
* Base64 encode / decode
* http://www.webtoolkit.info/
*
**/
(function() {
var _Base64 = {
// private property
_keyStr :
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
// public method for encoding
encode : function (input, isBinaryData) {
var output = [];
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;
input = isBinaryData ? String.fromCharCode.apply(null, input) :
_Base64._utf8_encode(input);
var len = input.length;
while (i < len) {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output.push(
this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4));
}
return output.join("");
},
// public method for decoding
decode : function (input) {
if(!input)
return "";
var output = [];
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
var len = input.length;
while (i < len) {
enc1 = this._keyStr.indexOf(input.charAt(i++));
enc2 = this._keyStr.indexOf(input.charAt(i++));
enc3 = this._keyStr.indexOf(input.charAt(i++));
enc4 = this._keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output.push( String.fromCharCode(chr1));
if (enc3 != 64) {
output.push(String.fromCharCode(chr2));
}
if (enc4 != 64) {
output.push( String.fromCharCode(chr3));
}
}
return _Base64._utf8_decode(output.join(""));
},
// private method for UTF-8 encoding
_utf8_encode : function (string) {
string = string.replace(/\r\n/g,"\n");
var utftext = [];
var len = string.length;
for (var n = 0; n < len; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext.push( String.fromCharCode(c));
}
else if((c > 127) & (c < 2048)) {
utftext.push(String.fromCharCode((c >> 6) | 192),
String.fromCharCode((c & 63) | 128));
}
else {
utftext.push( String.fromCharCode((c >> 12) | 224),
String.fromCharCode(((c >> 6) & 63) | 128),
String.fromCharCode((c & 63) | 128));
}
}
return utftext.join("");
},
// private method for UTF-8 decoding
_utf8_decode : function (utftext) {
var string = [];
var i = 0;
var c = c1 = c2 = 0;
var len = utftext.length;
while ( i < len ) {
c = utftext.charCodeAt(i);
if (c < 128) {
string.push(String.fromCharCode(c));
i++;
}
else if((c > 191) & (c < 224)) {
c2 = utftext.charCodeAt(i+1);
string.push(String.fromCharCode(((c & 31) << 6) | (c2 & 63)));
i += 2;
}
else {
c2 = utftext.charCodeAt(i+1);
c3 = utftext.charCodeAt(i+2);
string.push( String.fromCharCode(((c & 15) << 12) |
((c2 & 63) << 6) | (c3 & 63)));
i += 3;
}
}
return string.join("");
}
}
if (typeof(window) != 'undefined' && window.Foxmarks) {
Foxmarks.provide('Foxmarks.ThirdParty.Base64');
Foxmarks.ThirdParty.Base64 = _Base64 ;
} else {
Base64 = _Base64;
}
})();