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ntulip/BinaryJS

Created August 4, 2009 20:11
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  1. ntulip revised this gist Aug 4, 2009. 1 changed file with 0 additions and 1 deletion.
    1 change: 0 additions & 1 deletion BinaryJS
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    Original file line number Diff line number Diff line change
    @@ -1,4 +1,3 @@

    /*
    * Binary Ajax 0.1.7
    * Copyright (c) 2008 Jacob Seidelin, [email protected], http://blog.nihilogic.dk/
  2. ntulip created this gist Aug 4, 2009.
    239 changes: 239 additions & 0 deletions BinaryJS
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    Original file line number Diff line number Diff line change
    @@ -0,0 +1,239 @@

    /*
    * Binary Ajax 0.1.7
    * Copyright (c) 2008 Jacob Seidelin, [email protected], http://blog.nihilogic.dk/
    * Licensed under the MPL License [http://www.nihilogic.dk/licenses/mpl-license.txt]
    */


    var BinaryFile = function(strData, iDataOffset, iDataLength) {
    var data = strData;
    var dataOffset = iDataOffset || 0;
    var dataLength = 0;

    this.getRawData = function() {
    return data;
    }

    if (typeof strData == "string") {
    dataLength = iDataLength || data.length;

    this.getByteAt = function(iOffset) {
    return data.charCodeAt(iOffset + dataOffset) & 0xFF;
    }
    } else if (typeof strData == "unknown") {
    dataLength = iDataLength || IEBinary_getLength(data);

    this.getByteAt = function(iOffset) {
    return IEBinary_getByteAt(data, iOffset + dataOffset);
    }
    }

    this.getLength = function() {
    return dataLength;
    }

    this.getSByteAt = function(iOffset) {
    var iByte = this.getByteAt(iOffset);
    if (iByte > 127)
    return iByte - 256;
    else
    return iByte;
    }

    this.getShortAt = function(iOffset, bBigEndian) {
    var iShort = bBigEndian ?
    (this.getByteAt(iOffset) << 8) + this.getByteAt(iOffset + 1)
    : (this.getByteAt(iOffset + 1) << 8) + this.getByteAt(iOffset)
    if (iShort < 0) iShort += 65536;
    return iShort;
    }
    this.getSShortAt = function(iOffset, bBigEndian) {
    var iUShort = this.getShortAt(iOffset, bBigEndian);
    if (iUShort > 32767)
    return iUShort - 65536;
    else
    return iUShort;
    }
    this.getLongAt = function(iOffset, bBigEndian) {
    var iByte1 = this.getByteAt(iOffset),
    iByte2 = this.getByteAt(iOffset + 1),
    iByte3 = this.getByteAt(iOffset + 2),
    iByte4 = this.getByteAt(iOffset + 3);

    var iLong = bBigEndian ?
    (((((iByte1 << 8) + iByte2) << 8) + iByte3) << 8) + iByte4
    : (((((iByte4 << 8) + iByte3) << 8) + iByte2) << 8) + iByte1;
    if (iLong < 0) iLong += 4294967296;
    return iLong;
    }
    this.getSLongAt = function(iOffset, bBigEndian) {
    var iULong = this.getLongAt(iOffset, bBigEndian);
    if (iULong > 2147483647)
    return iULong - 4294967296;
    else
    return iULong;
    }
    this.getStringAt = function(iOffset, iLength) {
    var aStr = [];
    for (var i=iOffset,j=0;i<iOffset+iLength;i++,j++) {
    aStr[j] = String.fromCharCode(this.getByteAt(i));
    }
    return aStr.join("");
    }

    this.getCharAt = function(iOffset) {
    return String.fromCharCode(this.getByteAt(iOffset));
    }
    this.toBase64 = function() {
    return window.btoa(data);
    }
    this.fromBase64 = function(strBase64) {
    data = window.atob(strBase64);
    }
    }


    var BinaryAjax = (function() {

    function createRequest() {
    var oHTTP = null;
    if (window.XMLHttpRequest) {
    oHTTP = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
    oHTTP = new ActiveXObject("Microsoft.XMLHTTP");
    }
    return oHTTP;
    }

    function getHead(strURL, fncCallback, fncError) {
    var oHTTP = createRequest();
    if (oHTTP) {
    if (fncCallback) {
    if (typeof(oHTTP.onload) != "undefined") {
    oHTTP.onload = function() {
    if (oHTTP.status == "200") {
    fncCallback(this);
    } else {
    if (fncError) fncError();
    }
    oHTTP = null;
    };
    } else {
    oHTTP.onreadystatechange = function() {
    if (oHTTP.readyState == 4) {
    if (oHTTP.status == "200") {
    fncCallback(this);
    } else {
    if (fncError) fncError();
    }
    oHTTP = null;
    }
    };
    }
    }
    oHTTP.open("HEAD", strURL, true);
    oHTTP.send(null);
    } else {
    if (fncError) fncError();
    }
    }

    function sendRequest(strURL, fncCallback, fncError, aRange, bAcceptRanges, iFileSize) {
    var oHTTP = createRequest();
    if (oHTTP) {

    var iDataOffset = 0;
    if (aRange && !bAcceptRanges) {
    iDataOffset = aRange[0];
    }
    var iDataLen = 0;
    if (aRange) {
    iDataLen = aRange[1]-aRange[0]+1;
    }

    if (fncCallback) {
    if (typeof(oHTTP.onload) != "undefined") {
    oHTTP.onload = function() {

    if (oHTTP.status == "200" || oHTTP.status == "206" || oHTTP.status == "0") {
    oHTTP.binaryResponse = new BinaryFile(oHTTP.responseText, iDataOffset, iDataLen);
    oHTTP.fileSize = iFileSize || oHTTP.getResponseHeader("Content-Length");
    fncCallback(oHTTP);
    } else {
    if (fncError) fncError();
    }
    oHTTP = null;
    };
    } else {
    oHTTP.onreadystatechange = function() {
    if (oHTTP.readyState == 4) {
    if (oHTTP.status == "200" || oHTTP.status == "206" || oHTTP.status == "0") {
    // IE6 craps if we try to extend the XHR object
    var oRes = {
    status : oHTTP.status,
    binaryResponse : new BinaryFile(oHTTP.responseBody, iDataOffset, iDataLen),
    fileSize : iFileSize || oHTTP.getResponseHeader("Content-Length")
    };
    fncCallback(oRes);
    } else {
    if (fncError) fncError();
    }
    oHTTP = null;
    }
    };
    }
    }
    oHTTP.open("GET", strURL, true);

    if (oHTTP.overrideMimeType) oHTTP.overrideMimeType('text/plain; charset=x-user-defined');

    if (aRange && bAcceptRanges) {
    oHTTP.setRequestHeader("Range", "bytes=" + aRange[0] + "-" + aRange[1]);
    }

    oHTTP.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 1970 00:00:00 GMT");

    oHTTP.send(null);
    } else {
    if (fncError) fncError();
    }
    }

    return function(strURL, fncCallback, fncError, aRange) {

    if (aRange) {
    getHead(
    strURL,
    function(oHTTP) {
    var iLength = parseInt(oHTTP.getResponseHeader("Content-Length"),10);
    var strAcceptRanges = oHTTP.getResponseHeader("Accept-Ranges");

    var iStart, iEnd;
    iStart = aRange[0];
    if (aRange[0] < 0)
    iStart += iLength;
    iEnd = iStart + aRange[1] - 1;

    sendRequest(strURL, fncCallback, fncError, [iStart, iEnd], (strAcceptRanges == "bytes"), iLength);
    }
    );

    } else {
    sendRequest(strURL, fncCallback, fncError);
    }
    }

    }());


    document.write(
    "<script type='text/vbscript'>\r\n"
    + "Function IEBinary_getByteAt(strBinary, iOffset)\r\n"
    + " IEBinary_getByteAt = AscB(MidB(strBinary,iOffset+1,1))\r\n"
    + "End Function\r\n"
    + "Function IEBinary_getLength(strBinary)\r\n"
    + " IEBinary_getLength = LenB(strBinary)\r\n"
    + "End Function\r\n"
    + "</script>\r\n"
    );