| |
| * |
| * Base64 encode / decode |
| * |
| * @author haitao.tu |
| * @date 2010-04-26 |
| * @email tuhaitao@foxmail.com |
| * |
| */ |
| |
| function Base64() { |
| |
| |
| _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; |
| |
| |
| this.encode = function (input) { |
| var output = ""; |
| var chr1, chr2, chr3, enc1, enc2, enc3, enc4; |
| var i = 0; |
| input = _utf8_encode(input); |
| while (i < input.length) { |
| chr1 = input.charCodeAt(i++); |
| chr2 = input.charCodeAt(i++); |
| chr3 = input.charCodeAt(i++); |
| enc1 = chr1 >> 2; |
| enc2 = ((chr1 & 3) << 4) | (chr2 >> 4); |
| enc3 = ((chr2 & 15) << 2) | (chr3 >> 6); |
| enc4 = chr3 & 63; |
| if (isNaN(chr2)) { |
| enc3 = enc4 = 64; |
| } else if (isNaN(chr3)) { |
| enc4 = 64; |
| } |
| output = output + |
| _keyStr.charAt(enc1) + _keyStr.charAt(enc2) + |
| _keyStr.charAt(enc3) + _keyStr.charAt(enc4); |
| } |
| return output; |
| } |
| |
| |
| this.decode = function (input) { |
| var output = ""; |
| var chr1, chr2, chr3; |
| var enc1, enc2, enc3, enc4; |
| var i = 0; |
| input = input.replace(/[^A-Za-z0-9\+\/\=]/g, ""); |
| while (i < input.length) { |
| enc1 = _keyStr.indexOf(input.charAt(i++)); |
| enc2 = _keyStr.indexOf(input.charAt(i++)); |
| enc3 = _keyStr.indexOf(input.charAt(i++)); |
| enc4 = _keyStr.indexOf(input.charAt(i++)); |
| chr1 = (enc1 << 2) | (enc2 >> 4); |
| chr2 = ((enc2 & 15) << 4) | (enc3 >> 2); |
| chr3 = ((enc3 & 3) << 6) | enc4; |
| output = output + String.fromCharCode(chr1); |
| if (enc3 != 64) { |
| output = output + String.fromCharCode(chr2); |
| } |
| if (enc4 != 64) { |
| output = output + String.fromCharCode(chr3); |
| } |
| } |
| output = _utf8_decode(output); |
| return output; |
| } |
| |
| |
| _utf8_encode = function (string) { |
| string = string.replace(/\r\n/g,"\n"); |
| var utftext = ""; |
| for (var n = 0; n < string.length; n++) { |
| var c = string.charCodeAt(n); |
| if (c < 128) { |
| utftext += String.fromCharCode(c); |
| } else if((c > 127) && (c < 2048)) { |
| utftext += String.fromCharCode((c >> 6) | 192); |
| utftext += String.fromCharCode((c & 63) | 128); |
| } else { |
| utftext += String.fromCharCode((c >> 12) | 224); |
| utftext += String.fromCharCode(((c >> 6) & 63) | 128); |
| utftext += String.fromCharCode((c & 63) | 128); |
| } |
| |
| } |
| return utftext; |
| } |
| |
| |
| _utf8_decode = function (utftext) { |
| var string = ""; |
| var i = 0; |
| var c = c1 = c2 = 0; |
| while ( i < utftext.length ) { |
| c = utftext.charCodeAt(i); |
| if (c < 128) { |
| string += String.fromCharCode(c); |
| i++; |
| } else if((c > 191) && (c < 224)) { |
| c2 = utftext.charCodeAt(i+1); |
| string += String.fromCharCode(((c & 31) << 6) | (c2 & 63)); |
| i += 2; |
| } else { |
| c2 = utftext.charCodeAt(i+1); |
| c3 = utftext.charCodeAt(i+2); |
| string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)); |
| i += 3; |
| } |
| } |
| return string; |
| } |
| } |