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base64.js
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121 lines (97 loc) · 3 KB
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/* Base64 Encode and Decode */
var BASE64 = {
// private property
_keyStr: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=',
// public method for encoding
encode: function (input) {
var output = ''
var i = 0
var chr1, chr2, chr3, enc1, enc2, enc3, enc4
input = BASE64._utf8_encode(input)
while (i < input.length) {
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 += (this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) + this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4))
}
return output
},
// public method for decoding
decode: function (input) {
var output = ''
var i = 0
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '')
while (i < input.length) {
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 += String.fromCharCode(chr1)
if (enc3 != 64) {
output += String.fromCharCode(chr2)
}
if (enc4 != 64) {
output += String.fromCharCode(chr3)
}
}
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
}
}