paste.chapril.org-tools/js/base64-1.7.js

238 lines
7.2 KiB
JavaScript

/*
* $Id: base64.js,v 1.7 2012/08/23 10:30:18 dankogai Exp dankogai $
*
* Licensed under the MIT license.
* https://www.opensource.org/licenses/mit-license.php
*
* References:
* https://en.wikipedia.org/wiki/Base64
*/
(function(global){
var b64chars
= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
var b64charcodes = function(){
var a = [];
var codeA = 'A'.charCodeAt(0);
var codea = 'a'.charCodeAt(0);
var code0 = '0'.charCodeAt(0);
for (var i = 0; i < 26; i ++) a.push(codeA + i);
for (var i = 0; i < 26; i ++) a.push(codea + i);
for (var i = 0; i < 10; i ++) a.push(code0 + i);
a.push('+'.charCodeAt(0));
a.push('/'.charCodeAt(0));
return a;
}();
var b64tab = function(bin){
var t = {};
for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i;
return t;
}(b64chars);
var stringToArray = function(s){
var a = [];
for (var i = 0, l = s.length; i < l; i ++) a[i] = s.charCodeAt(i);
return a;
};
var convertUTF8ArrayToBase64 = function(bin){
var padlen = 0;
while (bin.length % 3){
bin.push(0);
padlen++;
};
var b64 = [];
for (var i = 0, l = bin.length; i < l; i += 3){
var c0 = bin[i], c1 = bin[i+1], c2 = bin[i+2];
if (c0 >= 256 || c1 >= 256 || c2 >= 256)
throw 'unsupported character found';
var n = (c0 << 16) | (c1 << 8) | c2;
b64.push(
b64charcodes[ n >>> 18],
b64charcodes[(n >>> 12) & 63],
b64charcodes[(n >>> 6) & 63],
b64charcodes[ n & 63]
);
}
while (padlen--) b64[b64.length - padlen - 1] = '='.charCodeAt(0);
return chunkStringFromCharCodeApply(b64);
};
var convertBase64ToUTF8Array = function(b64){
b64 = b64.replace(/[^A-Za-z0-9+\/]+/g, '');
var bin = [];
var padlen = b64.length % 4;
for (var i = 0, l = b64.length; i < l; i += 4){
var n = ((b64tab[b64.charAt(i )] || 0) << 18)
| ((b64tab[b64.charAt(i+1)] || 0) << 12)
| ((b64tab[b64.charAt(i+2)] || 0) << 6)
| ((b64tab[b64.charAt(i+3)] || 0));
bin.push(
( n >> 16 ),
( (n >> 8) & 0xff ),
( n & 0xff )
);
}
bin.length -= [0,0,2,1][padlen];
return bin;
};
var convertUTF16ArrayToUTF8Array = function(uni){
var bin = [];
for (var i = 0, l = uni.length; i < l; i++){
var n = uni[i];
if (n < 0x80)
bin.push(n);
else if (n < 0x800)
bin.push(
0xc0 | (n >>> 6),
0x80 | (n & 0x3f));
else
bin.push(
0xe0 | ((n >>> 12) & 0x0f),
0x80 | ((n >>> 6) & 0x3f),
0x80 | (n & 0x3f));
}
return bin;
};
var convertUTF8ArrayToUTF16Array = function(bin){
var uni = [];
for (var i = 0, l = bin.length; i < l; i++){
var c0 = bin[i];
if (c0 < 0x80){
uni.push(c0);
}else{
var c1 = bin[++i];
if (c0 < 0xe0){
uni.push(((c0 & 0x1f) << 6) | (c1 & 0x3f));
}else{
var c2 = bin[++i];
uni.push(
((c0 & 0x0f) << 12) | ((c1 & 0x3f) << 6) | (c2 & 0x3f)
);
}
}
}
return uni;
};
var convertUTF8StringToBase64 = function(bin){
return convertUTF8ArrayToBase64(stringToArray(bin));
};
var convertBase64ToUTF8String = function(b64){
return chunkStringFromCharCodeApply(convertBase64ToUTF8Array(b64));
};
var convertUTF8StringToUTF16Array = function(bin){
return convertUTF8ArrayToUTF16Array(stringToArray(bin));
};
var convertUTF8ArrayToUTF16String = function(bin){
return chunkStringFromCharCodeApply(convertUTF8ArrayToUTF16Array(bin));
};
var convertUTF8StringToUTF16String = function(bin){
return chunkStringFromCharCodeApply(
convertUTF8ArrayToUTF16Array(stringToArray(bin))
);
};
var convertUTF16StringToUTF8Array = function(uni){
return convertUTF16ArrayToUTF8Array(stringToArray(uni));
};
var convertUTF16ArrayToUTF8String = function(uni){
return chunkStringFromCharCodeApply(convertUTF16ArrayToUTF8Array(uni));
};
var convertUTF16StringToUTF8String = function(uni){
return chunkStringFromCharCodeApply(
convertUTF16ArrayToUTF8Array(stringToArray(uni))
);
};
/*
* String.fromCharCode.apply will only handle arrays as big as 65536,
* after that it'll return a truncated string with no warning.
*/
var chunkStringFromCharCodeApply = function(arr){
var strs = [], i;
for (i = 0; i < arr.length; i += 65536){
strs.push(String.fromCharCode.apply(String, arr.slice(i, i+65536)));
}
return strs.join('');
};
if (global.btoa){
var btoa = global.btoa;
var convertUTF16StringToBase64 = function (uni){
return btoa(convertUTF16StringToUTF8String(uni));
};
}
else {
var btoa = convertUTF8StringToBase64;
var convertUTF16StringToBase64 = function (uni){
return convertUTF8ArrayToBase64(convertUTF16StringToUTF8Array(uni));
};
}
if (global.atob){
var atob = global.atob;
var convertBase64ToUTF16String = function (b64){
return convertUTF8StringToUTF16String(atob(b64));
};
}
else {
var atob = convertBase64ToUTF8String;
var convertBase64ToUTF16String = function (b64){
return convertUTF8ArrayToUTF16String(convertBase64ToUTF8Array(b64));
};
}
global.Base64 = {
convertUTF8ArrayToBase64:convertUTF8ArrayToBase64,
convertByteArrayToBase64:convertUTF8ArrayToBase64,
convertBase64ToUTF8Array:convertBase64ToUTF8Array,
convertBase64ToByteArray:convertBase64ToUTF8Array,
convertUTF16ArrayToUTF8Array:convertUTF16ArrayToUTF8Array,
convertUTF16ArrayToByteArray:convertUTF16ArrayToUTF8Array,
convertUTF8ArrayToUTF16Array:convertUTF8ArrayToUTF16Array,
convertByteArrayToUTF16Array:convertUTF8ArrayToUTF16Array,
convertUTF8StringToBase64:convertUTF8StringToBase64,
convertBase64ToUTF8String:convertBase64ToUTF8String,
convertUTF8StringToUTF16Array:convertUTF8StringToUTF16Array,
convertUTF8ArrayToUTF16String:convertUTF8ArrayToUTF16String,
convertByteArrayToUTF16String:convertUTF8ArrayToUTF16String,
convertUTF8StringToUTF16String:convertUTF8StringToUTF16String,
convertUTF16StringToUTF8Array:convertUTF16StringToUTF8Array,
convertUTF16StringToByteArray:convertUTF16StringToUTF8Array,
convertUTF16ArrayToUTF8String:convertUTF16ArrayToUTF8String,
convertUTF16StringToUTF8String:convertUTF16StringToUTF8String,
convertUTF16StringToBase64:convertUTF16StringToBase64,
convertBase64ToUTF16String:convertBase64ToUTF16String,
fromBase64:convertBase64ToUTF8String,
toBase64:convertUTF8StringToBase64,
atob:atob,
btoa:btoa,
utob:convertUTF16StringToUTF8String,
btou:convertUTF8StringToUTF16String,
encode:convertUTF16StringToBase64,
encodeURI:function(u){
return convertUTF16StringToBase64(u).replace(/[+\/]/g, function(m0){
return m0 == '+' ? '-' : '_';
}).replace(/=+$/, '');
},
decode:function(a){
return convertBase64ToUTF16String(a.replace(/[-_]/g, function(m0){
return m0 == '-' ? '+' : '/';
}));
}
};
})(this);