includes/clientside/static/base64.js
author Dan
Mon, 03 Dec 2007 18:45:37 -0500
changeset 312 6c7060d36a23
parent 1 fe660c52c48f
permissions -rw-r--r--
Improved physical pages: they support comments and have their own dedicated namespace now. Still some consistency fixes to make.
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// Base64 encoder/decoder - pulled from http://ostermiller.org/calc/encode.html. Licensed under the GPL.
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var END_OF_INPUT = -1;
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var base64Chars = new Array(
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    'A','B','C','D','E','F','G','H',
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    'I','J','K','L','M','N','O','P',
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    'Q','R','S','T','U','V','W','X',
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    'Y','Z','a','b','c','d','e','f',
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    'g','h','i','j','k','l','m','n',
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    'o','p','q','r','s','t','u','v',
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    'w','x','y','z','0','1','2','3',
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    '4','5','6','7','8','9','+','/'
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);
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var reverseBase64Chars = new Array();
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for (var i=0; i < base64Chars.length; i++){
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    reverseBase64Chars[base64Chars[i]] = i;
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}
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var base64Str;
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var base64Count;
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function setBase64Str(str){
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    base64Str = str;
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    base64Count = 0;
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}
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function readBase64(){    
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    if (!base64Str) return END_OF_INPUT;
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    if (base64Count >= base64Str.length) return END_OF_INPUT;
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    var c = base64Str.charCodeAt(base64Count) & 0xff;
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    base64Count++;
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    return c;
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}
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function encodeBase64(str){
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    setBase64Str(str);
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    var result = '';
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    var inBuffer = new Array(3);
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    var lineCount = 0;
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    var done = false;
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    while (!done && (inBuffer[0] = readBase64()) != END_OF_INPUT){
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        inBuffer[1] = readBase64();
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        inBuffer[2] = readBase64();
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        result += (base64Chars[ inBuffer[0] >> 2 ]);
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        if (inBuffer[1] != END_OF_INPUT){
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            result += (base64Chars [(( inBuffer[0] << 4 ) & 0x30) | (inBuffer[1] >> 4) ]);
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            if (inBuffer[2] != END_OF_INPUT){
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                result += (base64Chars [((inBuffer[1] << 2) & 0x3c) | (inBuffer[2] >> 6) ]);
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                result += (base64Chars [inBuffer[2] & 0x3F]);
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            } else {
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                result += (base64Chars [((inBuffer[1] << 2) & 0x3c)]);
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                result += ('=');
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                done = true;
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            }
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        } else {
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            result += (base64Chars [(( inBuffer[0] << 4 ) & 0x30)]);
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            result += ('=');
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            result += ('=');
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            done = true;
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        }
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        lineCount += 4;
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        if (lineCount >= 76){
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            result += ('\n');
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            lineCount = 0;
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        }
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    }
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    return result;
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}
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function readReverseBase64(){   
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    if (!base64Str) return END_OF_INPUT;
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    while (true){      
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        if (base64Count >= base64Str.length) return END_OF_INPUT;
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        var nextCharacter = base64Str.charAt(base64Count);
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        base64Count++;
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        if (reverseBase64Chars[nextCharacter]){
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            return reverseBase64Chars[nextCharacter];
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        }
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        if (nextCharacter == 'A') return 0;
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    }
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    return END_OF_INPUT;
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}
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function ntos(n){
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    n=n.toString(16);
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    if (n.length == 1) n="0"+n;
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    n="%"+n;
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    return unescape(n);
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}
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function decodeBase64(str){
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    setBase64Str(str);
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    var result = "";
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    var inBuffer = new Array(4);
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    var done = false;
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    while (!done && (inBuffer[0] = readReverseBase64()) != END_OF_INPUT
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        && (inBuffer[1] = readReverseBase64()) != END_OF_INPUT){
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        inBuffer[2] = readReverseBase64();
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        inBuffer[3] = readReverseBase64();
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        result += ntos((((inBuffer[0] << 2) & 0xff)| inBuffer[1] >> 4));
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        if (inBuffer[2] != END_OF_INPUT){
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            result +=  ntos((((inBuffer[1] << 4) & 0xff)| inBuffer[2] >> 2));
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            if (inBuffer[3] != END_OF_INPUT){
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                result +=  ntos((((inBuffer[2] << 6)  & 0xff) | inBuffer[3]));
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            } else {
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                done = true;
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            }
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        } else {
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            done = true;
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        }
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    }
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    return result;
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}
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