var BASE64={
/**
* This variable is coded key, each character corresponds to the subscript it represents the coding
*/
enKey: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
/**
* This variable is the decoding key, is an array,
* BASE64 character's ASCII value to do the next standard,
* which corresponds to is represented by the character encoding value.
*/
deKey: new Array(
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1
),
/**
* Encode
*/
encode: function(src){
//Use an array to store the encoded characters, the efficiency is much higher than string concatenation.
var str=new Array();
var ch1, ch2, ch3;
var pos=0;
//Encoding each of the three characters.
while(pos+3<=src.length){
ch1=src.charCodeAt(pos++);
ch2=src.charCodeAt(pos++);
ch3=src.charCodeAt(pos++);
str.push(this.enKey.charAt(ch1>>2), this.enKey.charAt(((ch1<<4)+(ch2>>4))&0x3f));
str.push(this.enKey.charAt(((ch2<<2)+(ch3>>6))&0x3f), this.enKey.charAt(ch3&0x3f));
}
//Encoding the rest of the characters
if(pos<src.length){
ch1=src.charCodeAt(pos++);
str.push(this.enKey.charAt(ch1>>2));
if(pos<src.length){
ch2=src.charCodeAt(pos);
str.push(this.enKey.charAt(((ch1<<4)+(ch2>>4))&0x3f));
str.push(this.enKey.charAt(ch2<<2&0x3f), '=');
}else{
str.push(this.enKey.charAt(ch1<<4&0x3f), '==');
}
}
//Combination of the encoded character, save as a string.
return str.join('');
},
/**
* Decode
*/
decode: function(src){
//Use an array to store the decoded characters.
var str=new Array();
var ch1, ch2, ch3, ch4;
var pos=0;
//Filtering illegal characters and remove the '='.
src=src.replace(/[^A-Za-z0-9\+\/]/g, '');
//Decoding the source string in partition of per four characters.
while(pos+4<=src.length){
ch1=this.deKey[src.charCodeAt(pos++)];
ch2=this.deKey[src.charCodeAt(pos++)];
ch3=this.deKey[src.charCodeAt(pos++)];
ch4=this.deKey[src.charCodeAt(pos++)];
str.push(String.fromCharCode(
(ch1<<2&0xff)+(ch2>>4), (ch2<<4&0xff)+(ch3>>2), (ch3<<6&0xff)+ch4));
}
//Decode the rest of the characters
if(pos+1<src.length){
ch1=this.deKey[src.charCodeAt(pos++)];
ch2=this.deKey[src.charCodeAt(pos++)];
if(pos<src.length){
ch3=this.deKey[src.charCodeAt(pos)];
str.push(String.fromCharCode((ch1<<2&0xff)+(ch2>>4), (ch2<<4&0xff)+(ch3>>2)));
}else{
str.push(String.fromCharCode((ch1<<2&0xff)+(ch2>>4)));
}
}
//Combination of the decoded characters, save as a string.
return str.join('');
}
};
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