| // Base64 JavaScript decoder |
| // Copyright (c) 2008 Lapo Luchini <lapo@lapo.it> |
| |
| // Permission to use, copy, modify, and/or distribute this software for any |
| // purpose with or without fee is hereby granted, provided that the above |
| // copyright notice and this permission notice appear in all copies. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| |
| Base64 = {}; |
| |
| Base64.decode = function(a) { |
| if (Base64.decoder == undefined) { |
| var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
| var allow = "= \f\n\r\t\u00A0\u2028\u2029"; |
| var dec = []; |
| for (var i = 0; i < 64; ++i) |
| dec[b64.charAt(i)] = i; |
| for (var i = 0; i < allow.length; ++i) |
| dec[allow.charAt(i)] = -1; |
| Base64.decoder = dec; |
| } |
| var out = []; |
| var bits = 0, char_count = 0; |
| for (var i = 0; i < a.length; ++i) { |
| var c = a.charAt(i); |
| if (c == '=') |
| break; |
| c = Base64.decoder[c]; |
| if (c == -1) |
| continue; |
| if (c == undefined) |
| throw 'Illegal character at offset ' + i; |
| bits |= c; |
| if (++char_count >= 4) { |
| out[out.length] = (bits >> 16); |
| out[out.length] = (bits >> 8) & 0xFF; |
| out[out.length] = bits & 0xFF; |
| bits = 0; |
| char_count = 0; |
| } else { |
| bits <<= 6; |
| } |
| } |
| switch (char_count) { |
| case 1: |
| throw "Base64 encoding incomplete: at least 2 bits missing"; |
| break; |
| case 2: |
| out[out.length] = (bits >> 10); |
| break; |
| case 3: |
| out[out.length] = (bits >> 16); |
| out[out.length] = (bits >> 8) & 0xFF; |
| break; |
| } |
| return out; |
| } |
| |
| Base64.re = /-----BEGIN [^-]+-----([A-Za-z0-9+\/=\s]+)-----END [^-]+-----|begin-base64[^\n]+\n([A-Za-z0-9+\/=\s]+)====/; |
| Base64.unarmor = function(a) { |
| var m = Base64.re.exec(a); |
| if (m) { |
| if (m[1]) |
| a = m[1]; |
| else if (m[2]) |
| a = m[2]; |
| } |
| return Base64.decode(a); |
| } |