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December 14, 2015 06:09
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Javascript Base64 encode/decode
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;"strict"; | |
window.Base64 = { | |
// private property | |
_keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=", | |
// public method for encoding | |
encode: function (input) { | |
var output = ""; | |
var chr = []; | |
var enc = []; | |
var i = 0; | |
input = Base64._utf8_encode(input); | |
while (i < input.length) { | |
chr[0] = input.charCodeAt(i++); | |
chr[1] = input.charCodeAt(i++); | |
chr[2] = input.charCodeAt(i++); | |
enc[0] = chr[0] >> 2; | |
enc[1] = ((chr[0] & 3) << 4) | (chr[1] >> 4); | |
enc[2] = ((chr[1] & 15) << 2) | (chr[2] >> 6); | |
enc[3] = chr[2] & 63; | |
if (isNaN(chr[1])) { | |
enc[2] = enc[3] = 64; | |
} else if (isNaN(chr[2])) { | |
enc[3] = 64; | |
} | |
output = output + this._keyStr.charAt(enc[0]) + this._keyStr.charAt(enc[1]) + this._keyStr.charAt(enc[2]) + this._keyStr.charAt(enc[3]); | |
} | |
return output; | |
}, | |
// public method for decoding | |
decode: function (input) { | |
var output = ""; | |
var chr = []; | |
var enc = []; | |
var i = 0; | |
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, ""); | |
while (i < input.length) { | |
enc[0] = this._keyStr.indexOf(input.charAt(i++)); | |
enc[1] = this._keyStr.indexOf(input.charAt(i++)); | |
enc[2] = this._keyStr.indexOf(input.charAt(i++)); | |
enc[3] = this._keyStr.indexOf(input.charAt(i++)); | |
chr[0] = (enc[0] << 2) | (enc[1] >> 4); | |
chr[1] = ((enc[1] & 15) << 4) | (enc[2] >> 2); | |
chr[2] = ((enc[2] & 3) << 6) | enc[3]; | |
output = output + String.fromCharCode(chr[0]); | |
if (enc[2] != 64) { | |
output = output + String.fromCharCode(chr[1]); | |
} | |
if (enc[3] != 64) { | |
output = output + String.fromCharCode(chr[2]); | |
} | |
} | |
output = Base64._utf8_decode(output); | |
return output; | |
}, | |
// private method for UTF-8 encoding | |
_utf8_encode: function (string) { | |
string = string.replace(/\r\n/g, "\n"); | |
var utftext = ""; | |
for (var n = 0; n < string.length; n++) { | |
var c = string.charCodeAt(n); | |
if (c < 128) { | |
utftext += String.fromCharCode(c); | |
} else if ((c > 127) && (c < 2048)) { | |
utftext += String.fromCharCode((c >> 6) | 192); | |
utftext += String.fromCharCode((c & 63) | 128); | |
} else { | |
utftext += String.fromCharCode((c >> 12) | 224); | |
utftext += String.fromCharCode(((c >> 6) & 63) | 128); | |
utftext += String.fromCharCode((c & 63) | 128); | |
} | |
} | |
return utftext; | |
}, | |
// private method for UTF-8 decoding | |
_utf8_decode: function (utftext) { | |
var string = ""; | |
var i = 0; | |
var c = 0; | |
var c1 = 0; | |
var c2 = 0; | |
while (i < utftext.length) { | |
c = utftext.charCodeAt(i); | |
if (c < 128) { | |
string += String.fromCharCode(c); | |
i++; | |
} else if ((c > 191) && (c < 224)) { | |
c2 = utftext.charCodeAt(i + 1); | |
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63)); | |
i += 2; | |
} else { | |
c2 = utftext.charCodeAt(i + 1); | |
c3 = utftext.charCodeAt(i + 2); | |
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)); | |
i += 3; | |
} | |
} | |
return string; | |
} | |
}; |
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Basic tests