2 * $Id: base64.js,v 1.7 2012/08/23 10:30:18 dankogai Exp dankogai $
4 * Licensed under the MIT license.
5 * http://www.opensource.org/licenses/mit-license.php
8 * http://en.wikipedia.org/wiki/Base64
14 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
16 var b64charcodes = function(){
18 var codeA = 'A'.charCodeAt(0);
19 var codea = 'a'.charCodeAt(0);
20 var code0 = '0'.charCodeAt(0);
21 for (var i = 0; i < 26; i ++) a.push(codeA + i);
22 for (var i = 0; i < 26; i ++) a.push(codea + i);
23 for (var i = 0; i < 10; i ++) a.push(code0 + i);
24 a.push('+'.charCodeAt(0));
25 a.push('/'.charCodeAt(0));
29 var b64tab = function(bin){
31 for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i;
35 var stringToArray = function(s){
37 for (var i = 0, l = s.length; i < l; i ++) a[i] = s.charCodeAt(i);
41 var convertUTF8ArrayToBase64 = function(bin){
43 while (bin.length % 3){
48 for (var i = 0, l = bin.length; i < l; i += 3){
49 var c0 = bin[i], c1 = bin[i+1], c2 = bin[i+2];
50 if (c0 >= 256 || c1 >= 256 || c2 >= 256)
51 throw 'unsupported character found';
52 var n = (c0 << 16) | (c1 << 8) | c2;
54 b64charcodes[ n >>> 18],
55 b64charcodes[(n >>> 12) & 63],
56 b64charcodes[(n >>> 6) & 63],
60 while (padlen--) b64[b64.length - padlen - 1] = '='.charCodeAt(0);
61 return chunkStringFromCharCodeApply(b64);
64 var convertBase64ToUTF8Array = function(b64){
65 b64 = b64.replace(/[^A-Za-z0-9+\/]+/g, '');
67 var padlen = b64.length % 4;
68 for (var i = 0, l = b64.length; i < l; i += 4){
69 var n = ((b64tab[b64.charAt(i )] || 0) << 18)
70 | ((b64tab[b64.charAt(i+1)] || 0) << 12)
71 | ((b64tab[b64.charAt(i+2)] || 0) << 6)
72 | ((b64tab[b64.charAt(i+3)] || 0));
79 bin.length -= [0,0,2,1][padlen];
83 var convertUTF16ArrayToUTF8Array = function(uni){
85 for (var i = 0, l = uni.length; i < l; i++){
95 0xe0 | ((n >>> 12) & 0x0f),
96 0x80 | ((n >>> 6) & 0x3f),
102 var convertUTF8ArrayToUTF16Array = function(bin){
104 for (var i = 0, l = bin.length; i < l; i++){
111 uni.push(((c0 & 0x1f) << 6) | (c1 & 0x3f));
115 ((c0 & 0x0f) << 12) | ((c1 & 0x3f) << 6) | (c2 & 0x3f)
123 var convertUTF8StringToBase64 = function(bin){
124 return convertUTF8ArrayToBase64(stringToArray(bin));
127 var convertBase64ToUTF8String = function(b64){
128 return chunkStringFromCharCodeApply(convertBase64ToUTF8Array(b64));
131 var convertUTF8StringToUTF16Array = function(bin){
132 return convertUTF8ArrayToUTF16Array(stringToArray(bin));
135 var convertUTF8ArrayToUTF16String = function(bin){
136 return chunkStringFromCharCodeApply(convertUTF8ArrayToUTF16Array(bin));
139 var convertUTF8StringToUTF16String = function(bin){
140 return chunkStringFromCharCodeApply(
141 convertUTF8ArrayToUTF16Array(stringToArray(bin))
145 var convertUTF16StringToUTF8Array = function(uni){
146 return convertUTF16ArrayToUTF8Array(stringToArray(uni));
149 var convertUTF16ArrayToUTF8String = function(uni){
150 return chunkStringFromCharCodeApply(convertUTF16ArrayToUTF8Array(uni));
153 var convertUTF16StringToUTF8String = function(uni){
154 return chunkStringFromCharCodeApply(
155 convertUTF16ArrayToUTF8Array(stringToArray(uni))
160 * String.fromCharCode.apply will only handle arrays as big as 65536,
161 * after that it'll return a truncated string with no warning.
163 var chunkStringFromCharCodeApply = function(arr){
165 for (i = 0; i < arr.length; i += 65536){
166 strs.push(String.fromCharCode.apply(String, arr.slice(i, i+65536)));
168 return strs.join('');
172 var btoa = global.btoa;
173 var convertUTF16StringToBase64 = function (uni){
174 return btoa(convertUTF16StringToUTF8String(uni));
178 var btoa = convertUTF8StringToBase64;
179 var convertUTF16StringToBase64 = function (uni){
180 return convertUTF8ArrayToBase64(convertUTF16StringToUTF8Array(uni));
185 var atob = global.atob;
186 var convertBase64ToUTF16String = function (b64){
187 return convertUTF8StringToUTF16String(atob(b64));
191 var atob = convertBase64ToUTF8String;
192 var convertBase64ToUTF16String = function (b64){
193 return convertUTF8ArrayToUTF16String(convertBase64ToUTF8Array(b64));
198 convertUTF8ArrayToBase64:convertUTF8ArrayToBase64,
199 convertByteArrayToBase64:convertUTF8ArrayToBase64,
200 convertBase64ToUTF8Array:convertBase64ToUTF8Array,
201 convertBase64ToByteArray:convertBase64ToUTF8Array,
202 convertUTF16ArrayToUTF8Array:convertUTF16ArrayToUTF8Array,
203 convertUTF16ArrayToByteArray:convertUTF16ArrayToUTF8Array,
204 convertUTF8ArrayToUTF16Array:convertUTF8ArrayToUTF16Array,
205 convertByteArrayToUTF16Array:convertUTF8ArrayToUTF16Array,
206 convertUTF8StringToBase64:convertUTF8StringToBase64,
207 convertBase64ToUTF8String:convertBase64ToUTF8String,
208 convertUTF8StringToUTF16Array:convertUTF8StringToUTF16Array,
209 convertUTF8ArrayToUTF16String:convertUTF8ArrayToUTF16String,
210 convertByteArrayToUTF16String:convertUTF8ArrayToUTF16String,
211 convertUTF8StringToUTF16String:convertUTF8StringToUTF16String,
212 convertUTF16StringToUTF8Array:convertUTF16StringToUTF8Array,
213 convertUTF16StringToByteArray:convertUTF16StringToUTF8Array,
214 convertUTF16ArrayToUTF8String:convertUTF16ArrayToUTF8String,
215 convertUTF16StringToUTF8String:convertUTF16StringToUTF8String,
216 convertUTF16StringToBase64:convertUTF16StringToBase64,
217 convertBase64ToUTF16String:convertBase64ToUTF16String,
218 fromBase64:convertBase64ToUTF8String,
219 toBase64:convertUTF8StringToBase64,
222 utob:convertUTF16StringToUTF8String,
223 btou:convertUTF8StringToUTF16String,
224 encode:convertUTF16StringToBase64,
225 encodeURI:function(u){
226 return convertUTF16StringToBase64(u).replace(/[+\/]/g, function(m0){
227 return m0 == '+' ? '-' : '_';
228 }).replace(/=+$/, '');
231 return convertBase64ToUTF16String(a.replace(/[-_]/g, function(m0){
232 return m0 == '-' ? '+' : '/';