--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebApplication/jpeg-decoder.js	Wed Feb 25 13:45:35 2015 +0100
@@ -0,0 +1,984 @@
+/**
+ * SOURCE: https://github.com/notmasteryet/jpgjs/blob/master/jpg.js
+ **/
+
+
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- /
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+/*
+   Copyright 2011 notmasteryet
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+// - The JPEG specification can be found in the ITU CCITT Recommendation T.81
+//   (www.w3.org/Graphics/JPEG/itu-t81.pdf)
+// - The JFIF specification can be found in the JPEG File Interchange Format
+//   (www.w3.org/Graphics/JPEG/jfif3.pdf)
+// - The Adobe Application-Specific JPEG markers in the Supporting the DCT Filters
+//   in PostScript Level 2, Technical Note #5116
+//   (partners.adobe.com/public/developer/en/ps/sdk/5116.DCT_Filter.pdf)
+
+var JpegImage = (function jpegImage() {
+  "use strict";
+  var dctZigZag = new Int32Array([
+     0,
+     1,  8,
+    16,  9,  2,
+     3, 10, 17, 24,
+    32, 25, 18, 11, 4,
+     5, 12, 19, 26, 33, 40,
+    48, 41, 34, 27, 20, 13,  6,
+     7, 14, 21, 28, 35, 42, 49, 56,
+    57, 50, 43, 36, 29, 22, 15,
+    23, 30, 37, 44, 51, 58,
+    59, 52, 45, 38, 31,
+    39, 46, 53, 60,
+    61, 54, 47,
+    55, 62,
+    63
+  ]);
+
+  var dctCos1  =  4017   // cos(pi/16)
+  var dctSin1  =   799   // sin(pi/16)
+  var dctCos3  =  3406   // cos(3*pi/16)
+  var dctSin3  =  2276   // sin(3*pi/16)
+  var dctCos6  =  1567   // cos(6*pi/16)
+  var dctSin6  =  3784   // sin(6*pi/16)
+  var dctSqrt2 =  5793   // sqrt(2)
+  var dctSqrt1d2 = 2896  // sqrt(2) / 2
+
+  function constructor() {
+  }
+
+  function buildHuffmanTable(codeLengths, values) {
+    var k = 0, code = [], i, j, length = 16;
+    while (length > 0 && !codeLengths[length - 1])
+      length--;
+    code.push({children: [], index: 0});
+    var p = code[0], q;
+    for (i = 0; i < length; i++) {
+      for (j = 0; j < codeLengths[i]; j++) {
+        p = code.pop();
+        p.children[p.index] = values[k];
+        while (p.index > 0) {
+          p = code.pop();
+        }
+        p.index++;
+        code.push(p);
+        while (code.length <= i) {
+          code.push(q = {children: [], index: 0});
+          p.children[p.index] = q.children;
+          p = q;
+        }
+        k++;
+      }
+      if (i + 1 < length) {
+        // p here points to last code
+        code.push(q = {children: [], index: 0});
+        p.children[p.index] = q.children;
+        p = q;
+      }
+    }
+    return code[0].children;
+  }
+
+  function getBlockBufferOffset(component, row, col) {
+    return 64 * ((component.blocksPerLine + 1) * row + col);
+  }
+
+  function decodeScan(data, offset,
+                      frame, components, resetInterval,
+                      spectralStart, spectralEnd,
+                      successivePrev, successive) {
+    var precision = frame.precision;
+    var samplesPerLine = frame.samplesPerLine;
+    var scanLines = frame.scanLines;
+    var mcusPerLine = frame.mcusPerLine;
+    var progressive = frame.progressive;
+    var maxH = frame.maxH, maxV = frame.maxV;
+
+    var startOffset = offset, bitsData = 0, bitsCount = 0;
+
+    function readBit() {
+      if (bitsCount > 0) {
+        bitsCount--;
+        return (bitsData >> bitsCount) & 1;
+      }
+      bitsData = data[offset++];
+      if (bitsData == 0xFF) {
+        var nextByte = data[offset++];
+        if (nextByte) {
+          throw "unexpected marker: " + ((bitsData << 8) | nextByte).toString(16);
+        }
+        // unstuff 0
+      }
+      bitsCount = 7;
+      return bitsData >>> 7;
+    }
+
+    function decodeHuffman(tree) {
+      var node = tree;
+      var bit;
+      while ((bit = readBit()) !== null) {
+        node = node[bit];
+        if (typeof node === 'number')
+          return node;
+        if (typeof node !== 'object')
+          throw "invalid huffman sequence";
+      }
+      return null;
+    }
+
+    function receive(length) {
+      var n = 0;
+      while (length > 0) {
+        var bit = readBit();
+        if (bit === null) return;
+        n = (n << 1) | bit;
+        length--;
+      }
+      return n;
+    }
+
+    function receiveAndExtend(length) {
+      var n = receive(length);
+      if (n >= 1 << (length - 1))
+        return n;
+      return n + (-1 << length) + 1;
+    }
+
+    function decodeBaseline(component, offset) {
+      var t = decodeHuffman(component.huffmanTableDC);
+      var diff = t === 0 ? 0 : receiveAndExtend(t);
+      component.blockData[offset] = (component.pred += diff);
+      var k = 1;
+      while (k < 64) {
+        var rs = decodeHuffman(component.huffmanTableAC);
+        var s = rs & 15, r = rs >> 4;
+        if (s === 0) {
+          if (r < 15)
+            break;
+          k += 16;
+          continue;
+        }
+        k += r;
+        var z = dctZigZag[k];
+        component.blockData[offset + z] = receiveAndExtend(s);
+        k++;
+      }
+    }
+
+    function decodeDCFirst(component, offset) {
+      var t = decodeHuffman(component.huffmanTableDC);
+      var diff = t === 0 ? 0 : (receiveAndExtend(t) << successive);
+      component.blockData[offset] = (component.pred += diff);
+    }
+
+    function decodeDCSuccessive(component, offset) {
+      component.blockData[offset] |= readBit() << successive;
+    }
+
+    var eobrun = 0;
+    function decodeACFirst(component, offset) {
+      if (eobrun > 0) {
+        eobrun--;
+        return;
+      }
+      var k = spectralStart, e = spectralEnd;
+      while (k <= e) {
+        var rs = decodeHuffman(component.huffmanTableAC);
+        var s = rs & 15, r = rs >> 4;
+        if (s === 0) {
+          if (r < 15) {
+            eobrun = receive(r) + (1 << r) - 1;
+            break;
+          }
+          k += 16;
+          continue;
+        }
+        k += r;
+        var z = dctZigZag[k];
+        component.blockData[offset + z] = receiveAndExtend(s) * (1 << successive);
+        k++;
+      }
+    }
+
+    var successiveACState = 0, successiveACNextValue;
+    function decodeACSuccessive(component, offset) {
+      var k = spectralStart, e = spectralEnd, r = 0;
+      while (k <= e) {
+        var z = dctZigZag[k];
+        switch (successiveACState) {
+        case 0: // initial state
+          var rs = decodeHuffman(component.huffmanTableAC);
+          var s = rs & 15, r = rs >> 4;
+          if (s === 0) {
+            if (r < 15) {
+              eobrun = receive(r) + (1 << r);
+              successiveACState = 4;
+            } else {
+              r = 16;
+              successiveACState = 1;
+            }
+          } else {
+            if (s !== 1)
+              throw "invalid ACn encoding";
+            successiveACNextValue = receiveAndExtend(s);
+            successiveACState = r ? 2 : 3;
+          }
+          continue;
+        case 1: // skipping r zero items
+        case 2:
+          if (component.blockData[offset + z]) {
+            component.blockData[offset + z] += (readBit() << successive);
+          } else {
+            r--;
+            if (r === 0)
+              successiveACState = successiveACState == 2 ? 3 : 0;
+          }
+          break;
+        case 3: // set value for a zero item
+          if (component.blockData[offset + z]) {
+            component.blockData[offset + z] += (readBit() << successive);
+          } else {
+            component.blockData[offset + z] = successiveACNextValue << successive;
+            successiveACState = 0;
+          }
+          break;
+        case 4: // eob
+          if (component.blockData[offset + z]) {
+            component.blockData[offset + z] += (readBit() << successive);
+          }
+          break;
+        }
+        k++;
+      }
+      if (successiveACState === 4) {
+        eobrun--;
+        if (eobrun === 0)
+          successiveACState = 0;
+      }
+    }
+
+    function decodeMcu(component, decode, mcu, row, col) {
+      var mcuRow = (mcu / mcusPerLine) | 0;
+      var mcuCol = mcu % mcusPerLine;
+      var blockRow = mcuRow * component.v + row;
+      var blockCol = mcuCol * component.h + col;
+      var offset = getBlockBufferOffset(component, blockRow, blockCol);
+      decode(component, offset);
+    }
+
+    function decodeBlock(component, decode, mcu) {
+      var blockRow = (mcu / component.blocksPerLine) | 0;
+      var blockCol = mcu % component.blocksPerLine;
+      var offset = getBlockBufferOffset(component, blockRow, blockCol);
+      decode(component, offset);
+    }
+
+    var componentsLength = components.length;
+    var component, i, j, k, n;
+    var decodeFn;
+    if (progressive) {
+      if (spectralStart === 0)
+        decodeFn = successivePrev === 0 ? decodeDCFirst : decodeDCSuccessive;
+      else
+        decodeFn = successivePrev === 0 ? decodeACFirst : decodeACSuccessive;
+    } else {
+      decodeFn = decodeBaseline;
+    }
+
+    var mcu = 0, marker;
+    var mcuExpected;
+    if (componentsLength == 1) {
+      mcuExpected = components[0].blocksPerLine * components[0].blocksPerColumn;
+    } else {
+      mcuExpected = mcusPerLine * frame.mcusPerColumn;
+    }
+    if (!resetInterval) {
+      resetInterval = mcuExpected;
+    }
+
+    var h, v;
+    while (mcu < mcuExpected) {
+      // reset interval stuff
+      for (i = 0; i < componentsLength; i++) {
+        components[i].pred = 0;
+      }
+      eobrun = 0;
+
+      if (componentsLength == 1) {
+        component = components[0];
+        for (n = 0; n < resetInterval; n++) {
+          decodeBlock(component, decodeFn, mcu);
+          mcu++;
+        }
+      } else {
+        for (n = 0; n < resetInterval; n++) {
+          for (i = 0; i < componentsLength; i++) {
+            component = components[i];
+            h = component.h;
+            v = component.v;
+            for (j = 0; j < v; j++) {
+              for (k = 0; k < h; k++) {
+                decodeMcu(component, decodeFn, mcu, j, k);
+              }
+            }
+          }
+          mcu++;
+        }
+      }
+
+      // find marker
+      bitsCount = 0;
+      marker = (data[offset] << 8) | data[offset + 1];
+      if (marker <= 0xFF00) {
+        throw "marker was not found";
+      }
+
+      if (marker >= 0xFFD0 && marker <= 0xFFD7) { // RSTx
+        offset += 2;
+      } else {
+        break;
+      }
+    }
+
+    return offset - startOffset;
+  }
+
+  // A port of poppler's IDCT method which in turn is taken from:
+  //   Christoph Loeffler, Adriaan Ligtenberg, George S. Moschytz,
+  //   "Practical Fast 1-D DCT Algorithms with 11 Multiplications",
+  //   IEEE Intl. Conf. on Acoustics, Speech & Signal Processing, 1989,
+  //   988-991.
+  function quantizeAndInverse(component, blockBufferOffset, p) {
+    var qt = component.quantizationTable;
+    var v0, v1, v2, v3, v4, v5, v6, v7, t;
+    var i;
+
+    // dequant
+    for (i = 0; i < 64; i++) {
+      p[i] = component.blockData[blockBufferOffset + i] * qt[i];
+    }
+
+    // inverse DCT on rows
+    for (i = 0; i < 8; ++i) {
+      var row = 8 * i;
+
+      // check for all-zero AC coefficients
+      if (p[1 + row] == 0 && p[2 + row] == 0 && p[3 + row] == 0 &&
+          p[4 + row] == 0 && p[5 + row] == 0 && p[6 + row] == 0 &&
+          p[7 + row] == 0) {
+        t = (dctSqrt2 * p[0 + row] + 512) >> 10;
+        p[0 + row] = t;
+        p[1 + row] = t;
+        p[2 + row] = t;
+        p[3 + row] = t;
+        p[4 + row] = t;
+        p[5 + row] = t;
+        p[6 + row] = t;
+        p[7 + row] = t;
+        continue;
+      }
+
+      // stage 4
+      v0 = (dctSqrt2 * p[0 + row] + 128) >> 8;
+      v1 = (dctSqrt2 * p[4 + row] + 128) >> 8;
+      v2 = p[2 + row];
+      v3 = p[6 + row];
+      v4 = (dctSqrt1d2 * (p[1 + row] - p[7 + row]) + 128) >> 8;
+      v7 = (dctSqrt1d2 * (p[1 + row] + p[7 + row]) + 128) >> 8;
+      v5 = p[3 + row] << 4;
+      v6 = p[5 + row] << 4;
+
+      // stage 3
+      t = (v0 - v1+ 1) >> 1;
+      v0 = (v0 + v1 + 1) >> 1;
+      v1 = t;
+      t = (v2 * dctSin6 + v3 * dctCos6 + 128) >> 8;
+      v2 = (v2 * dctCos6 - v3 * dctSin6 + 128) >> 8;
+      v3 = t;
+      t = (v4 - v6 + 1) >> 1;
+      v4 = (v4 + v6 + 1) >> 1;
+      v6 = t;
+      t = (v7 + v5 + 1) >> 1;
+      v5 = (v7 - v5 + 1) >> 1;
+      v7 = t;
+
+      // stage 2
+      t = (v0 - v3 + 1) >> 1;
+      v0 = (v0 + v3 + 1) >> 1;
+      v3 = t;
+      t = (v1 - v2 + 1) >> 1;
+      v1 = (v1 + v2 + 1) >> 1;
+      v2 = t;
+      t = (v4 * dctSin3 + v7 * dctCos3 + 2048) >> 12;
+      v4 = (v4 * dctCos3 - v7 * dctSin3 + 2048) >> 12;
+      v7 = t;
+      t = (v5 * dctSin1 + v6 * dctCos1 + 2048) >> 12;
+      v5 = (v5 * dctCos1 - v6 * dctSin1 + 2048) >> 12;
+      v6 = t;
+
+      // stage 1
+      p[0 + row] = v0 + v7;
+      p[7 + row] = v0 - v7;
+      p[1 + row] = v1 + v6;
+      p[6 + row] = v1 - v6;
+      p[2 + row] = v2 + v5;
+      p[5 + row] = v2 - v5;
+      p[3 + row] = v3 + v4;
+      p[4 + row] = v3 - v4;
+    }
+
+    // inverse DCT on columns
+    for (i = 0; i < 8; ++i) {
+      var col = i;
+
+      // check for all-zero AC coefficients
+      if (p[1*8 + col] == 0 && p[2*8 + col] == 0 && p[3*8 + col] == 0 &&
+          p[4*8 + col] == 0 && p[5*8 + col] == 0 && p[6*8 + col] == 0 &&
+          p[7*8 + col] == 0) {
+        t = (dctSqrt2 * p[i+0] + 8192) >> 14;
+        p[0*8 + col] = t;
+        p[1*8 + col] = t;
+        p[2*8 + col] = t;
+        p[3*8 + col] = t;
+        p[4*8 + col] = t;
+        p[5*8 + col] = t;
+        p[6*8 + col] = t;
+        p[7*8 + col] = t;
+        continue;
+      }
+
+      // stage 4
+      v0 = (dctSqrt2 * p[0*8 + col] + 2048) >> 12;
+      v1 = (dctSqrt2 * p[4*8 + col] + 2048) >> 12;
+      v2 = p[2*8 + col];
+      v3 = p[6*8 + col];
+      v4 = (dctSqrt1d2 * (p[1*8 + col] - p[7*8 + col]) + 2048) >> 12;
+      v7 = (dctSqrt1d2 * (p[1*8 + col] + p[7*8 + col]) + 2048) >> 12;
+      v5 = p[3*8 + col];
+      v6 = p[5*8 + col];
+
+      // stage 3
+      t = (v0 - v1 + 1) >> 1;
+      v0 = (v0 + v1 + 1) >> 1;
+      v1 = t;
+      t = (v2 * dctSin6 + v3 * dctCos6 + 2048) >> 12;
+      v2 = (v2 * dctCos6 - v3 * dctSin6 + 2048) >> 12;
+      v3 = t;
+      t = (v4 - v6 + 1) >> 1;
+      v4 = (v4 + v6 + 1) >> 1;
+      v6 = t;
+      t = (v7 + v5 + 1) >> 1;
+      v5 = (v7 - v5 + 1) >> 1;
+      v7 = t;
+
+      // stage 2
+      t = (v0 - v3 + 1) >> 1;
+      v0 = (v0 + v3 + 1) >> 1;
+      v3 = t;
+      t = (v1 - v2 + 1) >> 1;
+      v1 = (v1 + v2 + 1) >> 1;
+      v2 = t;
+      t = (v4 * dctSin3 + v7 * dctCos3 + 2048) >> 12;
+      v4 = (v4 * dctCos3 - v7 * dctSin3 + 2048) >> 12;
+      v7 = t;
+      t = (v5 * dctSin1 + v6 * dctCos1 + 2048) >> 12;
+      v5 = (v5 * dctCos1 - v6 * dctSin1 + 2048) >> 12;
+      v6 = t;
+
+      // stage 1
+      p[0*8 + col] = v0 + v7;
+      p[7*8 + col] = v0 - v7;
+      p[1*8 + col] = v1 + v6;
+      p[6*8 + col] = v1 - v6;
+      p[2*8 + col] = v2 + v5;
+      p[5*8 + col] = v2 - v5;
+      p[3*8 + col] = v3 + v4;
+      p[4*8 + col] = v3 - v4;
+    }
+
+    // convert to 8-bit integers
+    for (i = 0; i < 64; ++i) {
+      var index = blockBufferOffset + i;
+      var q = p[i];
+      q = (q <= -2056) ? 0 : (q >= 2024) ? 255 : (q + 2056) >> 4;
+      component.blockData[index] = q;
+    }
+  }
+
+  function buildComponentData(frame, component) {
+    var lines = [];
+    var blocksPerLine = component.blocksPerLine;
+    var blocksPerColumn = component.blocksPerColumn;
+    var samplesPerLine = blocksPerLine << 3;
+    var computationBuffer = new Int32Array(64);
+
+    var i, j, ll = 0;
+    for (var blockRow = 0; blockRow < blocksPerColumn; blockRow++) {
+      for (var blockCol = 0; blockCol < blocksPerLine; blockCol++) {
+        var offset = getBlockBufferOffset(component, blockRow, blockCol)
+        quantizeAndInverse(component, offset, computationBuffer);
+      }
+    }
+    return component.blockData;
+  }
+
+  function clampToUint8(a) {
+    return a <= 0 ? 0 : a >= 255 ? 255 : a | 0;
+  }
+
+  constructor.prototype = {
+    load: function load(path) {
+      var handleData = (function(data) {
+        this.parse(data);
+        if (this.onload)
+          this.onload();
+      }).bind(this);
+
+      if (path.indexOf("data:") > -1) {
+        var offset = path.indexOf("base64,")+7;
+        var data = atob(path.substring(offset));
+        var arr = new Uint8Array(data.length);
+        for (var i = data.length - 1; i >= 0; i--) {
+          arr[i] = data.charCodeAt(i);
+        }
+        handleData(data);
+      } else {
+        var xhr = new XMLHttpRequest();
+        xhr.open("GET", path, true);
+        xhr.responseType = "arraybuffer";
+        xhr.onload = (function() {
+          // TODO catch parse error
+          var data = new Uint8Array(xhr.response);
+          handleData(data);
+        }).bind(this);
+        xhr.send(null);
+      }
+    },
+
+    parse: function parse(data) {
+
+      function readUint16() {
+        var value = (data[offset] << 8) | data[offset + 1];
+        offset += 2;
+        return value;
+      }
+
+      function readDataBlock() {
+        var length = readUint16();
+        var array = data.subarray(offset, offset + length - 2);
+        offset += array.length;
+        return array;
+      }
+
+      function prepareComponents(frame) {
+        var mcusPerLine = Math.ceil(frame.samplesPerLine / 8 / frame.maxH);
+        var mcusPerColumn = Math.ceil(frame.scanLines / 8 / frame.maxV);
+        for (var i = 0; i < frame.components.length; i++) {
+          component = frame.components[i];
+          var blocksPerLine = Math.ceil(Math.ceil(frame.samplesPerLine / 8) * component.h / frame.maxH);
+          var blocksPerColumn = Math.ceil(Math.ceil(frame.scanLines  / 8) * component.v / frame.maxV);
+          var blocksPerLineForMcu = mcusPerLine * component.h;
+          var blocksPerColumnForMcu = mcusPerColumn * component.v;
+
+          var blocksBufferSize = 64 * blocksPerColumnForMcu
+                                    * (blocksPerLineForMcu + 1);
+          component.blockData = new Int16Array(blocksBufferSize);
+          component.blocksPerLine = blocksPerLine;
+          component.blocksPerColumn = blocksPerColumn;
+        }
+        frame.mcusPerLine = mcusPerLine;
+        frame.mcusPerColumn = mcusPerColumn;
+      }
+
+      var offset = 0, length = data.length;
+      var jfif = null;
+      var adobe = null;
+      var pixels = null;
+      var frame, resetInterval;
+      var quantizationTables = [];
+      var huffmanTablesAC = [], huffmanTablesDC = [];
+      var fileMarker = readUint16();
+      if (fileMarker != 0xFFD8) { // SOI (Start of Image)
+        throw "SOI not found";
+      }
+
+      fileMarker = readUint16();
+      while (fileMarker != 0xFFD9) { // EOI (End of image)
+        var i, j, l;
+        switch(fileMarker) {
+          case 0xFFE0: // APP0 (Application Specific)
+          case 0xFFE1: // APP1
+          case 0xFFE2: // APP2
+          case 0xFFE3: // APP3
+          case 0xFFE4: // APP4
+          case 0xFFE5: // APP5
+          case 0xFFE6: // APP6
+          case 0xFFE7: // APP7
+          case 0xFFE8: // APP8
+          case 0xFFE9: // APP9
+          case 0xFFEA: // APP10
+          case 0xFFEB: // APP11
+          case 0xFFEC: // APP12
+          case 0xFFED: // APP13
+          case 0xFFEE: // APP14
+          case 0xFFEF: // APP15
+          case 0xFFFE: // COM (Comment)
+            var appData = readDataBlock();
+
+            if (fileMarker === 0xFFE0) {
+              if (appData[0] === 0x4A && appData[1] === 0x46 && appData[2] === 0x49 &&
+                appData[3] === 0x46 && appData[4] === 0) { // 'JFIF\x00'
+                jfif = {
+                  version: { major: appData[5], minor: appData[6] },
+                  densityUnits: appData[7],
+                  xDensity: (appData[8] << 8) | appData[9],
+                  yDensity: (appData[10] << 8) | appData[11],
+                  thumbWidth: appData[12],
+                  thumbHeight: appData[13],
+                  thumbData: appData.subarray(14, 14 + 3 * appData[12] * appData[13])
+                };
+              }
+            }
+            // TODO APP1 - Exif
+            if (fileMarker === 0xFFEE) {
+              if (appData[0] === 0x41 && appData[1] === 0x64 && appData[2] === 0x6F &&
+                appData[3] === 0x62 && appData[4] === 0x65 && appData[5] === 0) { // 'Adobe\x00'
+                adobe = {
+                  version: appData[6],
+                  flags0: (appData[7] << 8) | appData[8],
+                  flags1: (appData[9] << 8) | appData[10],
+                  transformCode: appData[11]
+                };
+              }
+            }
+            break;
+
+          case 0xFFDB: // DQT (Define Quantization Tables)
+            var quantizationTablesLength = readUint16();
+            var quantizationTablesEnd = quantizationTablesLength + offset - 2;
+            while (offset < quantizationTablesEnd) {
+              var quantizationTableSpec = data[offset++];
+              var tableData = new Int32Array(64);
+              if ((quantizationTableSpec >> 4) === 0) { // 8 bit values
+                for (j = 0; j < 64; j++) {
+                  var z = dctZigZag[j];
+                  tableData[z] = data[offset++];
+                }
+              } else if ((quantizationTableSpec >> 4) === 1) { //16 bit
+                for (j = 0; j < 64; j++) {
+                  var z = dctZigZag[j];
+                  tableData[z] = readUint16();
+                }
+              } else
+                throw "DQT: invalid table spec";
+              quantizationTables[quantizationTableSpec & 15] = tableData;
+            }
+            break;
+
+          case 0xFFC0: // SOF0 (Start of Frame, Baseline DCT)
+          case 0xFFC1: // SOF1 (Start of Frame, Extended DCT)
+          case 0xFFC2: // SOF2 (Start of Frame, Progressive DCT)
+            if (frame) {
+              throw "Only single frame JPEGs supported";
+            }
+            readUint16(); // skip data length
+            frame = {};
+            frame.extended = (fileMarker === 0xFFC1);
+            frame.progressive = (fileMarker === 0xFFC2);
+            frame.precision = data[offset++];
+            frame.scanLines = readUint16();
+            frame.samplesPerLine = readUint16();
+            frame.components = [];
+            frame.componentIds = {};
+            var componentsCount = data[offset++], componentId;
+            var maxH = 0, maxV = 0;
+            for (i = 0; i < componentsCount; i++) {
+              componentId = data[offset];
+              var h = data[offset + 1] >> 4;
+              var v = data[offset + 1] & 15;
+              if (maxH < h) maxH = h;
+              if (maxV < v) maxV = v;
+              var qId = data[offset + 2];
+              var l = frame.components.push({
+                h: h,
+                v: v,
+                quantizationTable: quantizationTables[qId]
+              });
+              frame.componentIds[componentId] = l - 1;
+              offset += 3;
+            }
+            frame.maxH = maxH;
+            frame.maxV = maxV;
+            prepareComponents(frame);
+            break;
+
+          case 0xFFC4: // DHT (Define Huffman Tables)
+            var huffmanLength = readUint16();
+            for (i = 2; i < huffmanLength;) {
+              var huffmanTableSpec = data[offset++];
+              var codeLengths = new Uint8Array(16);
+              var codeLengthSum = 0;
+              for (j = 0; j < 16; j++, offset++)
+                codeLengthSum += (codeLengths[j] = data[offset]);
+              var huffmanValues = new Uint8Array(codeLengthSum);
+              for (j = 0; j < codeLengthSum; j++, offset++)
+                huffmanValues[j] = data[offset];
+              i += 17 + codeLengthSum;
+
+              ((huffmanTableSpec >> 4) === 0 ?
+                huffmanTablesDC : huffmanTablesAC)[huffmanTableSpec & 15] =
+                buildHuffmanTable(codeLengths, huffmanValues);
+            }
+            break;
+
+          case 0xFFDD: // DRI (Define Restart Interval)
+            readUint16(); // skip data length
+            resetInterval = readUint16();
+            break;
+
+          case 0xFFDA: // SOS (Start of Scan)
+            var scanLength = readUint16();
+            var selectorsCount = data[offset++];
+            var components = [], component;
+            for (i = 0; i < selectorsCount; i++) {
+              var componentIndex = frame.componentIds[data[offset++]];
+              component = frame.components[componentIndex];
+              var tableSpec = data[offset++];
+              component.huffmanTableDC = huffmanTablesDC[tableSpec >> 4];
+              component.huffmanTableAC = huffmanTablesAC[tableSpec & 15];
+              components.push(component);
+            }
+            var spectralStart = data[offset++];
+            var spectralEnd = data[offset++];
+            var successiveApproximation = data[offset++];
+            var processed = decodeScan(data, offset,
+              frame, components, resetInterval,
+              spectralStart, spectralEnd,
+              successiveApproximation >> 4, successiveApproximation & 15);
+            offset += processed;
+            break;
+          default:
+            if (data[offset - 3] == 0xFF &&
+                data[offset - 2] >= 0xC0 && data[offset - 2] <= 0xFE) {
+              // could be incorrect encoding -- last 0xFF byte of the previous
+              // block was eaten by the encoder
+              offset -= 3;
+              break;
+            }
+            throw "unknown JPEG marker " + fileMarker.toString(16);
+        }
+        fileMarker = readUint16();
+      }
+
+      this.width = frame.samplesPerLine;
+      this.height = frame.scanLines;
+      this.jfif = jfif;
+      this.adobe = adobe;
+      this.components = [];
+      for (var i = 0; i < frame.components.length; i++) {
+        var component = frame.components[i];
+        this.components.push({
+          output: buildComponentData(frame, component),
+          scaleX: component.h / frame.maxH,
+          scaleY: component.v / frame.maxV,
+          blocksPerLine: component.blocksPerLine,
+          blocksPerColumn: component.blocksPerColumn
+        });
+      }
+    },
+
+    getData: function getData(width, height) {
+      var scaleX = this.width / width, scaleY = this.height / height;
+
+      var component, componentScaleX, componentScaleY;
+      var x, y, i;
+      var offset = 0;
+      var Y, Cb, Cr, K, C, M, Ye, R, G, B;
+      var colorTransform;
+      var numComponents = this.components.length;
+      var dataLength = width * height * numComponents;
+      var data = new Uint8Array(dataLength);
+      var componentLine;
+
+      // lineData is reused for all components. Assume first component is
+      // the biggest
+      var lineData = new Uint8Array((this.components[0].blocksPerLine << 3) *
+                                    this.components[0].blocksPerColumn * 8);
+
+      // First construct image data ...
+      for (i = 0; i < numComponents; i++) {
+        component = this.components[i];
+        var blocksPerLine = component.blocksPerLine;
+        var blocksPerColumn = component.blocksPerColumn;
+        var samplesPerLine = blocksPerLine << 3;
+
+        var j, k, ll = 0;
+        var lineOffset = 0;
+        for (var blockRow = 0; blockRow < blocksPerColumn; blockRow++) {
+          var scanLine = blockRow << 3;
+          for (var blockCol = 0; blockCol < blocksPerLine; blockCol++) {
+            var bufferOffset = getBlockBufferOffset(component, blockRow, blockCol);
+            var offset = 0, sample = blockCol << 3;
+            for (j = 0; j < 8; j++) {
+              var lineOffset = (scanLine + j) * samplesPerLine;
+              for (k = 0; k < 8; k++) {
+                lineData[lineOffset + sample + k] =
+                  component.output[bufferOffset + offset++];
+              }
+            }
+          }
+        }
+
+        componentScaleX = component.scaleX * scaleX;
+        componentScaleY = component.scaleY * scaleY;
+        offset = i;
+
+        var cx, cy;
+        var index;
+        for (y = 0; y < height; y++) {
+          for (x = 0; x < width; x++) {
+            cy = 0 | (y * componentScaleY);
+            cx = 0 | (x * componentScaleX);
+            index = cy * samplesPerLine + cx;
+            data[offset] = lineData[index];
+            offset += numComponents;
+          }
+        }
+      }
+
+      // ... then transform colors, if necessary
+      switch (numComponents) {
+        case 1: case 2: break;
+        // no color conversion for one or two compoenents
+
+        case 3:
+          // The default transform for three components is true
+          colorTransform = true;
+          // The adobe transform marker overrides any previous setting
+          if (this.adobe && this.adobe.transformCode)
+            colorTransform = true;
+          else if (typeof this.colorTransform !== 'undefined')
+            colorTransform = !!this.colorTransform;
+
+          if (colorTransform) {
+            for (i = 0; i < dataLength; i += numComponents) {
+              Y  = data[i    ];
+              Cb = data[i + 1];
+              Cr = data[i + 2];
+
+              R = clampToUint8(Y - 179.456 + 1.402 * Cr);
+              G = clampToUint8(Y + 135.459 - 0.344 * Cb - 0.714 * Cr);
+              B = clampToUint8(Y - 226.816 + 1.772 * Cb);
+
+              data[i    ] = R;
+              data[i + 1] = G;
+              data[i + 2] = B;
+            }
+          }
+          break;
+        case 4:
+          if (!this.adobe)
+            throw 'Unsupported color mode (4 components)';
+          // The default transform for four components is false
+          colorTransform = false;
+          // The adobe transform marker overrides any previous setting
+          if (this.adobe && this.adobe.transformCode)
+            colorTransform = true;
+          else if (typeof this.colorTransform !== 'undefined')
+            colorTransform = !!this.colorTransform;
+
+          if (colorTransform) {
+            for (i = 0; i < dataLength; i += numComponents) {
+              Y  = data[i];
+              Cb = data[i + 1];
+              Cr = data[i + 2];
+
+              C = clampToUint8(434.456 - Y - 1.402 * Cr);
+              M = clampToUint8(119.541 - Y + 0.344 * Cb + 0.714 * Cr);
+              Y = clampToUint8(481.816 - Y - 1.772 * Cb);
+
+              data[i    ] = C;
+              data[i + 1] = M;
+              data[i + 2] = Y;
+              // K is unchanged
+            }
+          }
+          break;
+        default:
+          throw 'Unsupported color mode';
+      }
+      return data;
+    },
+    copyToImageData: function copyToImageData(imageData) {
+      var width = imageData.width, height = imageData.height;
+      var imageDataBytes = width * height * 4;
+      var imageDataArray = imageData.data;
+      var data = this.getData(width, height);
+      var i = 0, j = 0, k0, k1;
+      var Y, K, C, M, R, G, B;
+      switch (this.components.length) {
+        case 1:
+          while (j < imageDataBytes) {
+            Y = data[i++];
+
+            imageDataArray[j++] = Y;
+            imageDataArray[j++] = Y;
+            imageDataArray[j++] = Y;
+            imageDataArray[j++] = 255;
+          }
+          break;
+        case 3:
+          while (j < imageDataBytes) {
+            R = data[i++];
+            G = data[i++];
+            B = data[i++];
+
+            imageDataArray[j++] = R;
+            imageDataArray[j++] = G;
+            imageDataArray[j++] = B;
+            imageDataArray[j++] = 255;
+          }
+          break;
+        case 4:
+          while (j < imageDataBytes) {
+            C = data[i++];
+            M = data[i++];
+            Y = data[i++];
+            K = data[i++];
+
+            k0 = 255 - K;
+            k1 = k0 / 255;
+
+
+            R = clampToUint8(k0 - C * k1);
+            G = clampToUint8(k0 - M * k1);
+            B = clampToUint8(k0 - Y * k1);
+
+            imageDataArray[j++] = R;
+            imageDataArray[j++] = G;
+            imageDataArray[j++] = B;
+            imageDataArray[j++] = 255;
+          }
+          break;
+        default:
+          throw 'Unsupported color mode';
+      }
+    }
+  };
+
+  return constructor;
+})();