JavaScripts Base64 Encoder and Decoder
<script language=javascript type="text/javascript"> <!– function urlDecode(str){ str=str.replace(new RegExp('\+','g'),' '); return unescape(str); } function urlEncode(str){ str=escape(str); str=str.replace(new RegExp('\+','g'),'%2B'); return str.replace(new RegExp('%20','g'),'+'); } vr END_OF_INPUT = -1; var base64Chars = new Array( 'A','B','C','D','E','F','G','H', 'I','J','K','L','M','N','O','P', 'Q','R','S','T','U','V','W','X', 'Y','Z','a','b','c','d','e','f', 'g','h','i','j','k','l','m','n', 'o','p','q','r','s','t','u','v', 'w','x','y','z','0','1','2','3', '4','5','6','7','8','9','+','/' ); var reverseBase64Chars = new Array(); for (var i=0; i < base64Chars.length; i++){ reverseBase64Chars[base64Chars[i]] = i; } var base64Str; var base64Count; function setBase64Str(str){ base64Str = str; base64Count = 0; } function readBase64(){ if (!base64Str) return END_OF_INPUT; if (base64Count >= base64Str.length) return END_OF_INPUT; var c = base64Str.charCodeAt(base64Count) & 0xff; base64Count++; return c; } function encodeBase64(str){ setBase64Str(str); var result = ''; var inBuffer = new Array(3); var lineCount = 0; var done = false; while (!done && (inBuffer[0] = readBase64()) != END_OF_INPUT){ inBuffer[1] = readBase64(); inBuffer[2] = readBase64(); result += (base64Chars[ inBuffer[0] >> 2 ]); if (inBuffer[1] != END_OF_INPUT){ result += (base64Chars [(( inBuffer[0] << 4 ) & 0×30) | (inBuffer[1] >> 4) ]); if (inBuffer[2] != END_OF_INPUT){ result += (base64Chars [((inBuffer[1] << 2) & 0x3c) | (inBuffer[2] >> 6) ]); result += (base64Chars [inBuffer[2] & 0x3F]); } else { result += (base64Chars [((inBuffer[1] << 2) & 0x3c)]); result += ('='); done = true; } } else { result += (base64Chars [(( inBuffer[0] << 4 ) & 0×30)]); result += ('='); result += ('='); done = true; } lineCount += 4; if (lineCount >= 76){ result += ('n'); lineCount = 0; } } return result; } function readReverseBase64(){ if (!base64Str) return END_OF_INPUT; while (true){ if (base64Count >= base64Str.length) return END_OF_INPUT; var nextCharacter = base64Str.charAt(base64Count); base64Count++; if (reverseBase64Chars[nextCharacter]){ return reverseBase64Chars[nextCharacter]; } if (nextCharacter == 'A') return 0; } return END_OF_INPUT; } function ntos(n){ n=n.toString(16); if (n.length == 1) n="0"+n; n="%"+n; return unescape(n); } function decodeBase64(str){ setBase64Str(str); var result = ""; var inBuffer = new Array(4); var done = false; while (!done && (inBuffer[0] = readReverseBase64()) != END_OF_INPUT && (inBuffer[1] = readReverseBase64()) != END_OF_INPUT){ inBuffer[2] = readReverseBase64(); inBuffer[3] = readReverseBase64(); result += ntos((((inBuffer[0] << 2) & 0xff)| inBuffer[1] >> 4)); if (inBuffer[2] != END_OF_INPUT){ result += ntos((((inBuffer[1] << 4) & 0xff)| inBuffer[2] >> 2)); if (inBuffer[3] != END_OF_INPUT){ result += ntos((((inBuffer[2] << 6) & 0xff) | inBuffer[3])); } else { done = true; } } else { done = true; } } return result; } var digitArray = new Array('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'); function toHex(n){ var result = '' var start = true; for (var i=32; i>0;){ i-=4; var digit = (n>>i) & 0xf; if (!start || digit != 0){ start = false; result += digitArray[digit]; } } return (result==''?'0':result); } function pad(str, len, pad){ var result = str; for (var i=str.length; i<len; i++){ result = pad + result; } return result; } function encodeHex(str){ var result = ""; for (var i=0; i<str.length; i++){ result += pad(toHex(str.charCodeAt(i)&0xff),2,'0'); } return result; } var hexv = { "00":0,"01":1,"02":2,"03":3,"04":4,"05":5,"06":6,"07":7,"08":8,"09":9,"0A":10,"0B":11,"0C":12,"0D":13,"0E":14,"0F":15, "10":16,"11":17,"12":18,"13":19,"14":20,"15":21,"16":22,"17":23,"18":24,"19":25,"1A":26,"1B":27,"1C":28,"1D":29,"1E":30,"1F":31, "20":32,"21":33,"22":34,"23":35,"24":36,"25":37,"26":38,"27":39,"28":40,"29":41,"2A":42,"2B":43,"2C":44,"2D":45,"2E":46,"2F":47, "30":48,"31":49,"32":50,"33":51,"34":52,"35":53,"36":54,"37":55,"38":56,"39":57,"3A":58,"3B":59,"3C":60,"3D":61,"3E":62,"3F":63, "40":64,"41":65,"42":66,"43":67,"44":68,"45":69,"46":70,"47":71,"48":72,"49":73,"4A":74,"4B":75,"4C":76,"4D":77,"4E":78,"4F":79, "50":80,"51":81,"52":82,"53":83,"54":84,"55":85,"56":86,"57":87,"58":88,"59":89,"5A":90,"5B":91,"5C":92,"5D":93,"5E":94,"5F":95, "60":96,"61":97,"62":98,"63":99,"64":100,"65":101,"66":102,"67":103,"68":104,"69":105,"6A":106,"6B":107,"6C":108,"6D":109,"6E":110,"6F":111, "70":112,"71":113,"72":114,"73":115,"74":116,"75":117,"76":118,"77":119,"78":120,"79":121,"7A":122,"7B":123,"7C":124,"7D":125,"7E":126,"7F":127, "80":128,"81":129,"82":130,"83":131,"84":132,"85":133,"86":134,"87":135,"88":136,"89":137,"8A":138,"8B":139,"8C":140,"8D":141,"8E":142,"8F":143, "90":144,"91":145,"92":146,"93":147,"94":148,"95":149,"96":150,"97":151,"98":152,"99":153,"9A":154,"9B":155,"9C":156,"9D":157,"9E":158,"9F":159, "A0":160,"A1":161,"A2":162,"A3":163,"A4":164,"A5":165,"A6":166,"A7":167,"A8":168,"A9":169,"AA":170,"AB":171,"AC":172,"AD":173,"AE":174,"AF":175, "B0":176,"B1":177,"B2":178,"B3":179,"B4":180,"B5":181,"B6":182,"B7":183,"B8":184,"B9":185,"BA":186,"BB":187,"BC":188,"BD":189,"BE":190,"BF":191, "C0":192,"C1":193,"C2":194,"C3":195,"C4":196,"C5":197,"C6":198,"C7":199,"C8":200,"C9":201,"CA":202,"CB":203,"CC":204,"CD":205,"CE":206,"CF":207, "D0":208,"D1":209,"D2":210,"D3":211,"D4":212,"D5":213,"D6":214,"D7":215,"D8":216,"D9":217,"DA":218,"DB":219,"DC":220,"DD":221,"DE":222,"DF":223, "E0":224,"E1":225,"E2":226,"E3":227,"E4":228,"E5":229,"E6":230,"E7":231,"E8":232,"E9":233,"EA":234,"EB":235,"EC":236,"ED":237,"EE":238,"EF":239, "F0":240,"F1":241,"F2":242,"F3":243,"F4":244,"F5":245,"F6":246,"F7":247,"F8":248,"F9":249,"FA":250,"FB":251,"FC":252,"FD":253,"FE":254,"FF":255 }; function decodeHex(str){ str = str.toUpperCase().replace(new RegExp("s/[^0-9A-Z]//g")); var result = ""; var nextchar = ""; for (var i=0; i<str.length; i++){ nextchar += str.charAt(i); if (nextchar.length == 2){ result += ntos(hexv[nextchar]); nextchar = ""; } } return result; } //–> </script>