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