mirror of
https://github.com/moparisthebest/mailiverse
synced 2024-11-15 05:35:07 -05:00
131 lines
3.0 KiB
JavaScript
131 lines
3.0 KiB
JavaScript
|
|
/**
|
|
* Uses the new array typed in javascript to binary base64 encode/decode
|
|
* at the moment just decodes a binary base64 encoded
|
|
* into either an ArrayBuffer (decodeArrayBuffer)
|
|
* or into an Uint8Array (decode)
|
|
*
|
|
* References:
|
|
* https://developer.mozilla.org/en/JavaScript_typed_arrays/ArrayBuffer
|
|
* https://developer.mozilla.org/en/JavaScript_typed_arrays/Uint8Array
|
|
*/
|
|
|
|
var Base64 = {
|
|
_key : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
|
|
_encode : null,
|
|
_decode : null,
|
|
|
|
initialize: function()
|
|
{
|
|
if (this._decode != null)
|
|
return;
|
|
|
|
this._decode = new Uint8Array(0xFF);
|
|
for (var i=0; i<this._key.length; ++i)
|
|
this._decode[this._key.charCodeAt(i)] = i;
|
|
|
|
this._encode = new Uint8Array(this._key.length);
|
|
for (var i=0; i<this._key.length; ++i)
|
|
this._encode[i] = this._key.charCodeAt(i) & 0xFF;
|
|
},
|
|
|
|
decode: function(input)
|
|
{
|
|
var bytes = new Uint8Array(input.length);
|
|
|
|
var i;
|
|
for (i=0; i<input.length; ++i)
|
|
bytes[i] = input.charCodeAt(i) & 0xFF;
|
|
|
|
return Base64.decodeBytes(bytes);
|
|
},
|
|
|
|
decodeBytes: function(input)
|
|
{
|
|
this.initialize();
|
|
|
|
//get last chars to see if are valid
|
|
var lkey1 = this._decode[input[input.length-1]];
|
|
var lkey2 = this._decode[input[input.length-2]];
|
|
|
|
var bytes = (input.length/4) * 3;
|
|
if (lkey1 == 64) bytes--; //padding chars, so skip
|
|
if (lkey2 == 64) bytes--; //padding chars, so skip
|
|
|
|
var out = [];
|
|
var chr1, chr2, chr3;
|
|
var enc1, enc2, enc3, enc4;
|
|
var i = 0;
|
|
var j = 0;
|
|
|
|
while (j < input.length)
|
|
{
|
|
enc1 = this._decode[input[j++]];
|
|
enc2 = this._decode[input[j++]];
|
|
enc3 = this._decode[input[j++]];
|
|
enc4 = this._decode[input[j++]];
|
|
|
|
chr1 = (enc1 << 2) | (enc2 >> 4);
|
|
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
|
|
chr3 = ((enc3 & 3) << 6) | enc4;
|
|
|
|
out[i++] = chr1 & 0xFF;
|
|
if (enc3 != 64) out[i++] = chr2 & 0xFF;
|
|
if (enc4 != 64) out[i++] = chr3 & 0xFF;
|
|
}
|
|
|
|
return out;
|
|
},
|
|
|
|
encodeBytes : function(input)
|
|
{
|
|
this.initialize();
|
|
|
|
var length = input.length;
|
|
var bytes = ((length+2)/3)*4;
|
|
var output = [];
|
|
|
|
var i = 0;
|
|
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
|
|
|
|
var j=0;
|
|
while (i < length)
|
|
{
|
|
var count = length - i;
|
|
chr1 = input[i++] & 0xFF;
|
|
chr2 = (i<length) ? (input[i++]&0xFF) : 0;
|
|
chr3 = (i<length) ? (input[i++]&0xFF) : 0;
|
|
|
|
enc1 = chr1 >> 2;
|
|
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
|
|
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
|
|
enc4 = chr3 & 63;
|
|
|
|
if (count == 1)
|
|
enc3 = enc4 = 64;
|
|
else
|
|
if (count == 2)
|
|
enc4 = 64;
|
|
|
|
output[j++] = this._encode[enc1];
|
|
output[j++] = this._encode[enc2];
|
|
output[j++] = this._encode[enc3];
|
|
output[j++] = this._encode[enc4];
|
|
}
|
|
|
|
return output;
|
|
},
|
|
|
|
encode: function(input)
|
|
{
|
|
var bytes = this.encodeBytes(input);
|
|
var s = "";
|
|
|
|
for (var i=0; i<bytes.length; ++i)
|
|
s += String.fromCharCode(bytes[i]);
|
|
|
|
return s;
|
|
}
|
|
} ;
|
|
|
|
/** end **/ |