| /* Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp> |
| * Version: 1.0 |
| * LastModified: Dec 25 1999 |
| * This library is free. You can redistribute it and/or modify it. |
| */ |
| /* Modified by Chris Anderson to not use CommonJS */ |
| /* Modified by Dan Webb not to require Narwhal's binary library */ |
| |
| var Base64 = {}; |
| (function(exports) { |
| |
| var encodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; |
| var decodeChars = [ |
| -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 |
| ]; |
| |
| exports.encode = function (str) { |
| var out, i, length; |
| var c1, c2, c3; |
| |
| length = len(str); |
| i = 0; |
| out = []; |
| while(i < length) { |
| c1 = str.charCodeAt(i++) & 0xff; |
| if(i == length) |
| { |
| out.push(encodeChars.charCodeAt(c1 >> 2)); |
| out.push(encodeChars.charCodeAt((c1 & 0x3) << 4)); |
| out.push("=".charCodeAt(0)); |
| out.push("=".charCodeAt(0)); |
| break; |
| } |
| c2 = str.charCodeAt(i++); |
| if(i == length) |
| { |
| out.push(encodeChars.charCodeAt(c1 >> 2)); |
| out.push(encodeChars.charCodeAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4))); |
| out.push(encodeChars.charCodeAt((c2 & 0xF) << 2)); |
| out.push("=".charCodeAt(0)); |
| break; |
| } |
| c3 = str.charCodeAt(i++); |
| out.push(encodeChars.charCodeAt(c1 >> 2)); |
| out.push(encodeChars.charCodeAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4))); |
| out.push(encodeChars.charCodeAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6))); |
| out.push(encodeChars.charCodeAt(c3 & 0x3F)); |
| } |
| |
| var str = ""; |
| out.forEach(function(chr) { str += String.fromCharCode(chr) }); |
| return str; |
| }; |
| |
| exports.decode = function (str) { |
| var c1, c2, c3, c4; |
| var i, length, out; |
| |
| length = len(str); |
| i = 0; |
| out = []; |
| while(i < length) { |
| /* c1 */ |
| do { |
| c1 = decodeChars[str.charCodeAt(i++) & 0xff]; |
| } while(i < length && c1 == -1); |
| if(c1 == -1) |
| break; |
| |
| /* c2 */ |
| do { |
| c2 = decodeChars[str.charCodeAt(i++) & 0xff]; |
| } while(i < length && c2 == -1); |
| if(c2 == -1) |
| break; |
| |
| out.push(String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4))); |
| |
| /* c3 */ |
| do { |
| c3 = str.charCodeAt(i++) & 0xff; |
| if(c3 == 61) |
| return out.join(''); |
| c3 = decodeChars[c3]; |
| } while(i < length && c3 == -1); |
| if(c3 == -1) |
| break; |
| |
| out.push(String.fromCharCode(((c2 & 0xF) << 4) | ((c3 & 0x3C) >> 2))); |
| |
| /* c4 */ |
| do { |
| c4 = str.charCodeAt(i++) & 0xff; |
| if(c4 == 61) |
| return out.join(''); |
| c4 = decodeChars[c4]; |
| } while(i < length && c4 == -1); |
| |
| if(c4 == -1) |
| break; |
| |
| out.push(String.fromCharCode(((c3 & 0x03) << 6) | c4)); |
| } |
| |
| return out.join(''); |
| }; |
| |
| var len = function (object) { |
| if (object.length !== undefined) { |
| return object.length; |
| } else if (object.getLength !== undefined) { |
| return object.getLength(); |
| } else { |
| return undefined; |
| } |
| }; |
| })(Base64); |