Add m-esr52 at 52.6.0

1 files changed, 2375 insertions, 0 deletions

diff --git a/devtools/shared/qrcode/decoder/index.js b/devtools/shared/qrcode/decoder/index.js
new file mode 100644
index 000000000..28a46de0f
--- /dev/null
+++ b/devtools/shared/qrcode/decoder/index.js
@@ -0,0 +1,2375 @@
+/*
+  Ported to JavaScript by Lazar Laszlo 2011
+
+  lazarsoft@gmail.com, www.lazarsoft.info
+*/
+/*
+*
+* Copyright 2007 ZXing authors
+*
+* 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.
+*/
+var imgU8 = null;
+
+var imgU32 = null;
+
+var imgWidth = 0;
+
+var imgHeight = 0;
+
+var maxImgSize = 1024 * 1024;
+
+var sizeOfDataLengthInfo = [ [ 10, 9, 8, 8 ], [ 12, 11, 16, 10 ], [ 14, 13, 16, 12 ] ];
+
+var GridSampler = {};
+
+GridSampler.checkAndNudgePoints = function(image, points) {
+  let width = imgWidth;
+  let height = imgHeight;
+  let nudged = true;
+  for (let offset = 0; offset < points.length && nudged; offset += 2) {
+    let x = Math.floor(points[offset]);
+    let y = Math.floor(points[offset + 1]);
+    if (x < -1 || x > width || y < -1 || y > height) {
+      throw "Error.checkAndNudgePoints ";
+    }
+    nudged = false;
+    if (x == -1) {
+      points[offset] = 0;
+      nudged = true;
+    } else if (x == width) {
+      points[offset] = width - 1;
+      nudged = true;
+    }
+    if (y == -1) {
+      points[offset + 1] = 0;
+      nudged = true;
+    } else if (y == height) {
+      points[offset + 1] = height - 1;
+      nudged = true;
+    }
+  }
+  nudged = true;
+  for (let offset = points.length - 2; offset >= 0 && nudged; offset -= 2) {
+    let x = Math.floor(points[offset]);
+    let y = Math.floor(points[offset + 1]);
+    if (x < -1 || x > width || y < -1 || y > height) {
+      throw "Error.checkAndNudgePoints ";
+    }
+    nudged = false;
+    if (x == -1) {
+      points[offset] = 0;
+      nudged = true;
+    } else if (x == width) {
+      points[offset] = width - 1;
+      nudged = true;
+    }
+    if (y == -1) {
+      points[offset + 1] = 0;
+      nudged = true;
+    } else if (y == height) {
+      points[offset + 1] = height - 1;
+      nudged = true;
+    }
+  }
+};
+
+GridSampler.sampleGrid3 = function(image, dimension, transform) {
+  let bits = new BitMatrix(dimension);
+  let points = new Array(dimension << 1);
+  for (let y = 0; y < dimension; y++) {
+    let max = points.length;
+    let iValue = y + 0.5;
+    for (let x = 0; x < max; x += 2) {
+      points[x] = (x >> 1) + 0.5;
+      points[x + 1] = iValue;
+    }
+    transform.transformPoints1(points);
+    GridSampler.checkAndNudgePoints(image, points);
+    try {
+      for (let x = 0; x < max; x += 2) {
+        let xpoint = Math.floor(points[x]) * 4 + Math.floor(points[x + 1]) * imgWidth * 4;
+        let bit = image[Math.floor(points[x]) + imgWidth * Math.floor(points[x + 1])];
+        imgU8[xpoint] = bit ? 255 : 0;
+        imgU8[xpoint + 1] = bit ? 255 : 0;
+        imgU8[xpoint + 2] = 0;
+        imgU8[xpoint + 3] = 255;
+        if (bit) bits.set_Renamed(x >> 1, y);
+      }
+    } catch (aioobe) {
+      throw "Error.checkAndNudgePoints";
+    }
+  }
+  return bits;
+};
+
+GridSampler.sampleGridx = function(image, dimension, p1ToX, p1ToY, p2ToX, p2ToY, p3ToX, p3ToY, p4ToX, p4ToY, p1FromX, p1FromY, p2FromX, p2FromY, p3FromX, p3FromY, p4FromX, p4FromY) {
+  let transform = PerspectiveTransform.quadrilateralToQuadrilateral(p1ToX, p1ToY, p2ToX, p2ToY, p3ToX, p3ToY, p4ToX, p4ToY, p1FromX, p1FromY, p2FromX, p2FromY, p3FromX, p3FromY, p4FromX, p4FromY);
+  return GridSampler.sampleGrid3(image, dimension, transform);
+};
+
+function ECB(count, dataCodewords) {
+  this.count = count;
+  this.dataCodewords = dataCodewords;
+  this.__defineGetter__("Count", function() {
+    return this.count;
+  });
+  this.__defineGetter__("DataCodewords", function() {
+    return this.dataCodewords;
+  });
+}
+
+function ECBlocks(ecCodewordsPerBlock, ecBlocks1, ecBlocks2) {
+  this.ecCodewordsPerBlock = ecCodewordsPerBlock;
+  if (ecBlocks2) this.ecBlocks = new Array(ecBlocks1, ecBlocks2); else this.ecBlocks = new Array(ecBlocks1);
+  this.__defineGetter__("ECCodewordsPerBlock", function() {
+    return this.ecCodewordsPerBlock;
+  });
+  this.__defineGetter__("TotalECCodewords", function() {
+    return this.ecCodewordsPerBlock * this.NumBlocks;
+  });
+  this.__defineGetter__("NumBlocks", function() {
+    let total = 0;
+    for (let i = 0; i < this.ecBlocks.length; i++) {
+      total += this.ecBlocks[i].length;
+    }
+    return total;
+  });
+  this.getECBlocks = function() {
+    return this.ecBlocks;
+  };
+}
+
+function Version(versionNumber, alignmentPatternCenters, ecBlocks1, ecBlocks2, ecBlocks3, ecBlocks4) {
+  this.versionNumber = versionNumber;
+  this.alignmentPatternCenters = alignmentPatternCenters;
+  this.ecBlocks = new Array(ecBlocks1, ecBlocks2, ecBlocks3, ecBlocks4);
+  let total = 0;
+  let ecCodewords = ecBlocks1.ECCodewordsPerBlock;
+  let ecbArray = ecBlocks1.getECBlocks();
+  for (let i = 0; i < ecbArray.length; i++) {
+    let ecBlock = ecbArray[i];
+    total += ecBlock.Count * (ecBlock.DataCodewords + ecCodewords);
+  }
+  this.totalCodewords = total;
+  this.__defineGetter__("VersionNumber", function() {
+    return this.versionNumber;
+  });
+  this.__defineGetter__("AlignmentPatternCenters", function() {
+    return this.alignmentPatternCenters;
+  });
+  this.__defineGetter__("TotalCodewords", function() {
+    return this.totalCodewords;
+  });
+  this.__defineGetter__("DimensionForVersion", function() {
+    return 17 + 4 * this.versionNumber;
+  });
+  this.buildFunctionPattern = function() {
+    let dimension = this.DimensionForVersion;
+    let bitMatrix = new BitMatrix(dimension);
+    bitMatrix.setRegion(0, 0, 9, 9);
+    bitMatrix.setRegion(dimension - 8, 0, 8, 9);
+    bitMatrix.setRegion(0, dimension - 8, 9, 8);
+    let max = this.alignmentPatternCenters.length;
+    for (let x = 0; x < max; x++) {
+      let i = this.alignmentPatternCenters[x] - 2;
+      for (let y = 0; y < max; y++) {
+        if (x === 0 && (y === 0 || y === max - 1) || x === max - 1 && y === 0) {
+          continue;
+        }
+        bitMatrix.setRegion(this.alignmentPatternCenters[y] - 2, i, 5, 5);
+      }
+    }
+    bitMatrix.setRegion(6, 9, 1, dimension - 17);
+    bitMatrix.setRegion(9, 6, dimension - 17, 1);
+    if (this.versionNumber > 6) {
+      bitMatrix.setRegion(dimension - 11, 0, 3, 6);
+      bitMatrix.setRegion(0, dimension - 11, 6, 3);
+    }
+    return bitMatrix;
+  };
+  this.getECBlocksForLevel = function(ecLevel) {
+    return this.ecBlocks[ecLevel.ordinal()];
+  };
+}
+
+Version.VERSION_DECODE_INFO = new Array(31892, 34236, 39577, 42195, 48118, 51042, 55367, 58893, 63784, 68472, 70749, 76311, 79154, 84390, 87683, 92361, 96236, 102084, 102881, 110507, 110734, 117786, 119615, 126325, 127568, 133589, 136944, 141498, 145311, 150283, 152622, 158308, 161089, 167017);
+
+Version.VERSIONS = buildVersions();
+
+Version.getVersionForNumber = function(versionNumber) {
+  if (versionNumber < 1 || versionNumber > 40) {
+    throw "ArgumentException";
+  }
+  return Version.VERSIONS[versionNumber - 1];
+};
+
+Version.getProvisionalVersionForDimension = function(dimension) {
+  if (dimension % 4 != 1) {
+    throw "Error getProvisionalVersionForDimension";
+  }
+  try {
+    return Version.getVersionForNumber(dimension - 17 >> 2);
+  } catch (iae) {
+    throw "Error getVersionForNumber";
+  }
+};
+
+Version.decodeVersionInformation = function(versionBits) {
+  let bestDifference = 4294967295;
+  let bestVersion = 0;
+  for (let i = 0; i < Version.VERSION_DECODE_INFO.length; i++) {
+    let targetVersion = Version.VERSION_DECODE_INFO[i];
+    if (targetVersion == versionBits) {
+      return this.getVersionForNumber(i + 7);
+    }
+    let bitsDifference = FormatInformation.numBitsDiffering(versionBits, targetVersion);
+    if (bitsDifference < bestDifference) {
+      bestVersion = i + 7;
+      bestDifference = bitsDifference;
+    }
+  }
+  if (bestDifference <= 3) {
+    return this.getVersionForNumber(bestVersion);
+  }
+  return null;
+};
+
+function buildVersions() {
+  return new Array(new Version(1, new Array(), new ECBlocks(7, new ECB(1, 19)), new ECBlocks(10, new ECB(1, 16)), new ECBlocks(13, new ECB(1, 13)), new ECBlocks(17, new ECB(1, 9))), new Version(2, new Array(6, 18), new ECBlocks(10, new ECB(1, 34)), new ECBlocks(16, new ECB(1, 28)), new ECBlocks(22, new ECB(1, 22)), new ECBlocks(28, new ECB(1, 16))), new Version(3, new Array(6, 22), new ECBlocks(15, new ECB(1, 55)), new ECBlocks(26, new ECB(1, 44)), new ECBlocks(18, new ECB(2, 17)), new ECBlocks(22, new ECB(2, 13))), new Version(4, new Array(6, 26), new ECBlocks(20, new ECB(1, 80)), new ECBlocks(18, new ECB(2, 32)), new ECBlocks(26, new ECB(2, 24)), new ECBlocks(16, new ECB(4, 9))), new Version(5, new Array(6, 30), new ECBlocks(26, new ECB(1, 108)), new ECBlocks(24, new ECB(2, 43)), new ECBlocks(18, new ECB(2, 15), new ECB(2, 16)), new ECBlocks(22, new ECB(2, 11), new ECB(2, 12))), new Version(6, new Array(6, 34), new ECBlocks(18, new ECB(2, 68)), new ECBlocks(16, new ECB(4, 27)), new ECBlocks(24, new ECB(4, 19)), new ECBlocks(28, new ECB(4, 15))), new Version(7, new Array(6, 22, 38), new ECBlocks(20, new ECB(2, 78)), new ECBlocks(18, new ECB(4, 31)), new ECBlocks(18, new ECB(2, 14), new ECB(4, 15)), new ECBlocks(26, new ECB(4, 13), new ECB(1, 14))), new Version(8, new Array(6, 24, 42), new ECBlocks(24, new ECB(2, 97)), new ECBlocks(22, new ECB(2, 38), new ECB(2, 39)), new ECBlocks(22, new ECB(4, 18), new ECB(2, 19)), new ECBlocks(26, new ECB(4, 14), new ECB(2, 15))), new Version(9, new Array(6, 26, 46), new ECBlocks(30, new ECB(2, 116)), new ECBlocks(22, new ECB(3, 36), new ECB(2, 37)), new ECBlocks(20, new ECB(4, 16), new ECB(4, 17)), new ECBlocks(24, new ECB(4, 12), new ECB(4, 13))), new Version(10, new Array(6, 28, 50), new ECBlocks(18, new ECB(2, 68), new ECB(2, 69)), new ECBlocks(26, new ECB(4, 43), new ECB(1, 44)), new ECBlocks(24, new ECB(6, 19), new ECB(2, 20)), new ECBlocks(28, new ECB(6, 15), new ECB(2, 16))), new Version(11, new Array(6, 30, 54), new ECBlocks(20, new ECB(4, 81)), new ECBlocks(30, new ECB(1, 50), new ECB(4, 51)), new ECBlocks(28, new ECB(4, 22), new ECB(4, 23)), new ECBlocks(24, new ECB(3, 12), new ECB(8, 13))), new Version(12, new Array(6, 32, 58), new ECBlocks(24, new ECB(2, 92), new ECB(2, 93)), new ECBlocks(22, new ECB(6, 36), new ECB(2, 37)), new ECBlocks(26, new ECB(4, 20), new ECB(6, 21)), new ECBlocks(28, new ECB(7, 14), new ECB(4, 15))), new Version(13, new Array(6, 34, 62), new ECBlocks(26, new ECB(4, 107)), new ECBlocks(22, new ECB(8, 37), new ECB(1, 38)), new ECBlocks(24, new ECB(8, 20), new ECB(4, 21)), new ECBlocks(22, new ECB(12, 11), new ECB(4, 12))), new Version(14, new Array(6, 26, 46, 66), new ECBlocks(30, new ECB(3, 115), new ECB(1, 116)), new ECBlocks(24, new ECB(4, 40), new ECB(5, 41)), new ECBlocks(20, new ECB(11, 16), new ECB(5, 17)), new ECBlocks(24, new ECB(11, 12), new ECB(5, 13))), new Version(15, new Array(6, 26, 48, 70), new ECBlocks(22, new ECB(5, 87), new ECB(1, 88)), new ECBlocks(24, new ECB(5, 41), new ECB(5, 42)), new ECBlocks(30, new ECB(5, 24), new ECB(7, 25)), new ECBlocks(24, new ECB(11, 12), new ECB(7, 13))), new Version(16, new Array(6, 26, 50, 74), new ECBlocks(24, new ECB(5, 98), new ECB(1, 99)), new ECBlocks(28, new ECB(7, 45), new ECB(3, 46)), new ECBlocks(24, new ECB(15, 19), new ECB(2, 20)), new ECBlocks(30, new ECB(3, 15), new ECB(13, 16))), new Version(17, new Array(6, 30, 54, 78), new ECBlocks(28, new ECB(1, 107), new ECB(5, 108)), new ECBlocks(28, new ECB(10, 46), new ECB(1, 47)), new ECBlocks(28, new ECB(1, 22), new ECB(15, 23)), new ECBlocks(28, new ECB(2, 14), new ECB(17, 15))), new Version(18, new Array(6, 30, 56, 82), new ECBlocks(30, new ECB(5, 120), new ECB(1, 121)), new ECBlocks(26, new ECB(9, 43), new ECB(4, 44)), new ECBlocks(28, new ECB(17, 22), new ECB(1, 23)), new ECBlocks(28, new ECB(2, 14), new ECB(19, 15))), new Version(19, new Array(6, 30, 58, 86), new ECBlocks(28, new ECB(3, 113), new ECB(4, 114)), new ECBlocks(26, new ECB(3, 44), new ECB(11, 45)), new ECBlocks(26, new ECB(17, 21), new ECB(4, 22)), new ECBlocks(26, new ECB(9, 13), new ECB(16, 14))), new Version(20, new Array(6, 34, 62, 90), new ECBlocks(28, new ECB(3, 107), new ECB(5, 108)), new ECBlocks(26, new ECB(3, 41), new ECB(13, 42)), new ECBlocks(30, new ECB(15, 24), new ECB(5, 25)), new ECBlocks(28, new ECB(15, 15), new ECB(10, 16))), new Version(21, new Array(6, 28, 50, 72, 94), new ECBlocks(28, new ECB(4, 116), new ECB(4, 117)), new ECBlocks(26, new ECB(17, 42)), new ECBlocks(28, new ECB(17, 22), new ECB(6, 23)), new ECBlocks(30, new ECB(19, 16), new ECB(6, 17))), new Version(22, new Array(6, 26, 50, 74, 98), new ECBlocks(28, new ECB(2, 111), new ECB(7, 112)), new ECBlocks(28, new ECB(17, 46)), new ECBlocks(30, new ECB(7, 24), new ECB(16, 25)), new ECBlocks(24, new ECB(34, 13))), new Version(23, new Array(6, 30, 54, 74, 102), new ECBlocks(30, new ECB(4, 121), new ECB(5, 122)), new ECBlocks(28, new ECB(4, 47), new ECB(14, 48)), new ECBlocks(30, new ECB(11, 24), new ECB(14, 25)), new ECBlocks(30, new ECB(16, 15), new ECB(14, 16))), new Version(24, new Array(6, 28, 54, 80, 106), new ECBlocks(30, new ECB(6, 117), new ECB(4, 118)), new ECBlocks(28, new ECB(6, 45), new ECB(14, 46)), new ECBlocks(30, new ECB(11, 24), new ECB(16, 25)), new ECBlocks(30, new ECB(30, 16), new ECB(2, 17))), new Version(25, new Array(6, 32, 58, 84, 110), new ECBlocks(26, new ECB(8, 106), new ECB(4, 107)), new ECBlocks(28, new ECB(8, 47), new ECB(13, 48)), new ECBlocks(30, new ECB(7, 24), new ECB(22, 25)), new ECBlocks(30, new ECB(22, 15), new ECB(13, 16))), new Version(26, new Array(6, 30, 58, 86, 114), new ECBlocks(28, new ECB(10, 114), new ECB(2, 115)), new ECBlocks(28, new ECB(19, 46), new ECB(4, 47)), new ECBlocks(28, new ECB(28, 22), new ECB(6, 23)), new ECBlocks(30, new ECB(33, 16), new ECB(4, 17))), new Version(27, new Array(6, 34, 62, 90, 118), new ECBlocks(30, new ECB(8, 122), new ECB(4, 123)), new ECBlocks(28, new ECB(22, 45), new ECB(3, 46)), new ECBlocks(30, new ECB(8, 23), new ECB(26, 24)), new ECBlocks(30, new ECB(12, 15), new ECB(28, 16))), new Version(28, new Array(6, 26, 50, 74, 98, 122), new ECBlocks(30, new ECB(3, 117), new ECB(10, 118)), new ECBlocks(28, new ECB(3, 45), new ECB(23, 46)), new ECBlocks(30, new ECB(4, 24), new ECB(31, 25)), new ECBlocks(30, new ECB(11, 15), new ECB(31, 16))), new Version(29, new Array(6, 30, 54, 78, 102, 126), new ECBlocks(30, new ECB(7, 116), new ECB(7, 117)), new ECBlocks(28, new ECB(21, 45), new ECB(7, 46)), new ECBlocks(30, new ECB(1, 23), new ECB(37, 24)), new ECBlocks(30, new ECB(19, 15), new ECB(26, 16))), new Version(30, new Array(6, 26, 52, 78, 104, 130), new ECBlocks(30, new ECB(5, 115), new ECB(10, 116)), new ECBlocks(28, new ECB(19, 47), new ECB(10, 48)), new ECBlocks(30, new ECB(15, 24), new ECB(25, 25)), new ECBlocks(30, new ECB(23, 15), new ECB(25, 16))), new Version(31, new Array(6, 30, 56, 82, 108, 134), new ECBlocks(30, new ECB(13, 115), new ECB(3, 116)), new ECBlocks(28, new ECB(2, 46), new ECB(29, 47)), new ECBlocks(30, new ECB(42, 24), new ECB(1, 25)), new ECBlocks(30, new ECB(23, 15), new ECB(28, 16))), new Version(32, new Array(6, 34, 60, 86, 112, 138), new ECBlocks(30, new ECB(17, 115)), new ECBlocks(28, new ECB(10, 46), new ECB(23, 47)), new ECBlocks(30, new ECB(10, 24), new ECB(35, 25)), new ECBlocks(30, new ECB(19, 15), new ECB(35, 16))), new Version(33, new Array(6, 30, 58, 86, 114, 142), new ECBlocks(30, new ECB(17, 115), new ECB(1, 116)), new ECBlocks(28, new ECB(14, 46), new ECB(21, 47)), new ECBlocks(30, new ECB(29, 24), new ECB(19, 25)), new ECBlocks(30, new ECB(11, 15), new ECB(46, 16))), new Version(34, new Array(6, 34, 62, 90, 118, 146), new ECBlocks(30, new ECB(13, 115), new ECB(6, 116)), new ECBlocks(28, new ECB(14, 46), new ECB(23, 47)), new ECBlocks(30, new ECB(44, 24), new ECB(7, 25)), new ECBlocks(30, new ECB(59, 16), new ECB(1, 17))), new Version(35, new Array(6, 30, 54, 78, 102, 126, 150), new ECBlocks(30, new ECB(12, 121), new ECB(7, 122)), new ECBlocks(28, new ECB(12, 47), new ECB(26, 48)), new ECBlocks(30, new ECB(39, 24), new ECB(14, 25)), new ECBlocks(30, new ECB(22, 15), new ECB(41, 16))), new Version(36, new Array(6, 24, 50, 76, 102, 128, 154), new ECBlocks(30, new ECB(6, 121), new ECB(14, 122)), new ECBlocks(28, new ECB(6, 47), new ECB(34, 48)), new ECBlocks(30, new ECB(46, 24), new ECB(10, 25)), new ECBlocks(30, new ECB(2, 15), new ECB(64, 16))), new Version(37, new Array(6, 28, 54, 80, 106, 132, 158), new ECBlocks(30, new ECB(17, 122), new ECB(4, 123)), new ECBlocks(28, new ECB(29, 46), new ECB(14, 47)), new ECBlocks(30, new ECB(49, 24), new ECB(10, 25)), new ECBlocks(30, new ECB(24, 15), new ECB(46, 16))), new Version(38, new Array(6, 32, 58, 84, 110, 136, 162), new ECBlocks(30, new ECB(4, 122), new ECB(18, 123)), new ECBlocks(28, new ECB(13, 46), new ECB(32, 47)), new ECBlocks(30, new ECB(48, 24), new ECB(14, 25)), new ECBlocks(30, new ECB(42, 15), new ECB(32, 16))), new Version(39, new Array(6, 26, 54, 82, 110, 138, 166), new ECBlocks(30, new ECB(20, 117), new ECB(4, 118)), new ECBlocks(28, new ECB(40, 47), new ECB(7, 48)), new ECBlocks(30, new ECB(43, 24), new ECB(22, 25)), new ECBlocks(30, new ECB(10, 15), new ECB(67, 16))), new Version(40, new Array(6, 30, 58, 86, 114, 142, 170), new ECBlocks(30, new ECB(19, 118), new ECB(6, 119)), new ECBlocks(28, new ECB(18, 47), new ECB(31, 48)), new ECBlocks(30, new ECB(34, 24), new ECB(34, 25)), new ECBlocks(30, new ECB(20, 15), new ECB(61, 16))));
+}
+
+function PerspectiveTransform(a11, a21, a31, a12, a22, a32, a13, a23, a33) {
+  this.a11 = a11;
+  this.a12 = a12;
+  this.a13 = a13;
+  this.a21 = a21;
+  this.a22 = a22;
+  this.a23 = a23;
+  this.a31 = a31;
+  this.a32 = a32;
+  this.a33 = a33;
+  this.transformPoints1 = function(points) {
+    let max = points.length;
+    let a11 = this.a11;
+    let a12 = this.a12;
+    let a13 = this.a13;
+    let a21 = this.a21;
+    let a22 = this.a22;
+    let a23 = this.a23;
+    let a31 = this.a31;
+    let a32 = this.a32;
+    let a33 = this.a33;
+    for (let i = 0; i < max; i += 2) {
+      let x = points[i];
+      let y = points[i + 1];
+      let denominator = a13 * x + a23 * y + a33;
+      points[i] = (a11 * x + a21 * y + a31) / denominator;
+      points[i + 1] = (a12 * x + a22 * y + a32) / denominator;
+    }
+  };
+  this.transformPoints2 = function(xValues, yValues) {
+    let n = xValues.length;
+    for (let i = 0; i < n; i++) {
+      let x = xValues[i];
+      let y = yValues[i];
+      let denominator = this.a13 * x + this.a23 * y + this.a33;
+      xValues[i] = (this.a11 * x + this.a21 * y + this.a31) / denominator;
+      yValues[i] = (this.a12 * x + this.a22 * y + this.a32) / denominator;
+    }
+  };
+  this.buildAdjoint = function() {
+    return new PerspectiveTransform(this.a22 * this.a33 - this.a23 * this.a32, this.a23 * this.a31 - this.a21 * this.a33, this.a21 * this.a32 - this.a22 * this.a31, this.a13 * this.a32 - this.a12 * this.a33, this.a11 * this.a33 - this.a13 * this.a31, this.a12 * this.a31 - this.a11 * this.a32, this.a12 * this.a23 - this.a13 * this.a22, this.a13 * this.a21 - this.a11 * this.a23, this.a11 * this.a22 - this.a12 * this.a21);
+  };
+  this.times = function(other) {
+    return new PerspectiveTransform(this.a11 * other.a11 + this.a21 * other.a12 + this.a31 * other.a13, this.a11 * other.a21 + this.a21 * other.a22 + this.a31 * other.a23, this.a11 * other.a31 + this.a21 * other.a32 + this.a31 * other.a33, this.a12 * other.a11 + this.a22 * other.a12 + this.a32 * other.a13, this.a12 * other.a21 + this.a22 * other.a22 + this.a32 * other.a23, this.a12 * other.a31 + this.a22 * other.a32 + this.a32 * other.a33, this.a13 * other.a11 + this.a23 * other.a12 + this.a33 * other.a13, this.a13 * other.a21 + this.a23 * other.a22 + this.a33 * other.a23, this.a13 * other.a31 + this.a23 * other.a32 + this.a33 * other.a33);
+  };
+}
+
+PerspectiveTransform.quadrilateralToQuadrilateral = function(x0, y0, x1, y1, x2, y2, x3, y3, x0p, y0p, x1p, y1p, x2p, y2p, x3p, y3p) {
+  let qToS = this.quadrilateralToSquare(x0, y0, x1, y1, x2, y2, x3, y3);
+  let sToQ = this.squareToQuadrilateral(x0p, y0p, x1p, y1p, x2p, y2p, x3p, y3p);
+  return sToQ.times(qToS);
+};
+
+PerspectiveTransform.squareToQuadrilateral = function(x0, y0, x1, y1, x2, y2, x3, y3) {
+  let dy2 = y3 - y2;
+  let dy3 = y0 - y1 + y2 - y3;
+  if (dy2 === 0 && dy3 === 0) {
+    return new PerspectiveTransform(x1 - x0, x2 - x1, x0, y1 - y0, y2 - y1, y0, 0, 0, 1);
+  } else {
+    let dx1 = x1 - x2;
+    let dx2 = x3 - x2;
+    let dx3 = x0 - x1 + x2 - x3;
+    let dy1 = y1 - y2;
+    let denominator = dx1 * dy2 - dx2 * dy1;
+    let a13 = (dx3 * dy2 - dx2 * dy3) / denominator;
+    let a23 = (dx1 * dy3 - dx3 * dy1) / denominator;
+    return new PerspectiveTransform(x1 - x0 + a13 * x1, x3 - x0 + a23 * x3, x0, y1 - y0 + a13 * y1, y3 - y0 + a23 * y3, y0, a13, a23, 1);
+  }
+};
+
+PerspectiveTransform.quadrilateralToSquare = function(x0, y0, x1, y1, x2, y2, x3, y3) {
+  return this.squareToQuadrilateral(x0, y0, x1, y1, x2, y2, x3, y3).buildAdjoint();
+};
+
+function DetectorResult(bits, points) {
+  this.bits = bits;
+  this.points = points;
+}
+
+function Detector(image) {
+  this.image = image;
+  this.resultPointCallback = null;
+  this.sizeOfBlackWhiteBlackRun = function(fromX, fromY, toX, toY) {
+    let steep = Math.abs(toY - fromY) > Math.abs(toX - fromX);
+    if (steep) {
+      let temp = fromX;
+      fromX = fromY;
+      fromY = temp;
+      temp = toX;
+      toX = toY;
+      toY = temp;
+    }
+    let dx = Math.abs(toX - fromX);
+    let dy = Math.abs(toY - fromY);
+    let error = -dx >> 1;
+    let ystep = fromY < toY ? 1 : -1;
+    let xstep = fromX < toX ? 1 : -1;
+    let state = 0;
+    for (let x = fromX, y = fromY; x != toX; x += xstep) {
+      let realX = steep ? y : x;
+      let realY = steep ? x : y;
+      if (state == 1) {
+        if (this.image[realX + realY * imgWidth]) {
+          state++;
+        }
+      } else {
+        if (!this.image[realX + realY * imgWidth]) {
+          state++;
+        }
+      }
+      if (state == 3) {
+        let diffX = x - fromX;
+        let diffY = y - fromY;
+        return Math.sqrt(diffX * diffX + diffY * diffY);
+      }
+      error += dy;
+      if (error > 0) {
+        if (y == toY) {
+          break;
+        }
+        y += ystep;
+        error -= dx;
+      }
+    }
+    let diffX2 = toX - fromX;
+    let diffY2 = toY - fromY;
+    return Math.sqrt(diffX2 * diffX2 + diffY2 * diffY2);
+  };
+  this.sizeOfBlackWhiteBlackRunBothWays = function(fromX, fromY, toX, toY) {
+    let result = this.sizeOfBlackWhiteBlackRun(fromX, fromY, toX, toY);
+    let scale = 1;
+    let otherToX = fromX - (toX - fromX);
+    if (otherToX < 0) {
+      scale = fromX / (fromX - otherToX);
+      otherToX = 0;
+    } else if (otherToX >= imgWidth) {
+      scale = (imgWidth - 1 - fromX) / (otherToX - fromX);
+      otherToX = imgWidth - 1;
+    }
+    let otherToY = Math.floor(fromY - (toY - fromY) * scale);
+    scale = 1;
+    if (otherToY < 0) {
+      scale = fromY / (fromY - otherToY);
+      otherToY = 0;
+    } else if (otherToY >= imgHeight) {
+      scale = (imgHeight - 1 - fromY) / (otherToY - fromY);
+      otherToY = imgHeight - 1;
+    }
+    otherToX = Math.floor(fromX + (otherToX - fromX) * scale);
+    result += this.sizeOfBlackWhiteBlackRun(fromX, fromY, otherToX, otherToY);
+    return result - 1;
+  };
+  this.calculateModuleSizeOneWay = function(pattern, otherPattern) {
+    let moduleSizeEst1 = this.sizeOfBlackWhiteBlackRunBothWays(Math.floor(pattern.X), Math.floor(pattern.Y), Math.floor(otherPattern.X), Math.floor(otherPattern.Y));
+    let moduleSizeEst2 = this.sizeOfBlackWhiteBlackRunBothWays(Math.floor(otherPattern.X), Math.floor(otherPattern.Y), Math.floor(pattern.X), Math.floor(pattern.Y));
+    if (isNaN(moduleSizeEst1)) {
+      return moduleSizeEst2 / 7;
+    }
+    if (isNaN(moduleSizeEst2)) {
+      return moduleSizeEst1 / 7;
+    }
+    return (moduleSizeEst1 + moduleSizeEst2) / 14;
+  };
+  this.calculateModuleSize = function(topLeft, topRight, bottomLeft) {
+    return (this.calculateModuleSizeOneWay(topLeft, topRight) + this.calculateModuleSizeOneWay(topLeft, bottomLeft)) / 2;
+  };
+  this.distance = function(pattern1, pattern2) {
+    let xDiff = pattern1.X - pattern2.X;
+    let yDiff = pattern1.Y - pattern2.Y;
+    return Math.sqrt(xDiff * xDiff + yDiff * yDiff);
+  };
+  this.computeDimension = function(topLeft, topRight, bottomLeft, moduleSize) {
+    let tltrCentersDimension = Math.round(this.distance(topLeft, topRight) / moduleSize);
+    let tlblCentersDimension = Math.round(this.distance(topLeft, bottomLeft) / moduleSize);
+    let dimension = (tltrCentersDimension + tlblCentersDimension >> 1) + 7;
+    switch (dimension & 3) {
+     case 0:
+      dimension++;
+      break;
+
+     case 2:
+      dimension--;
+      break;
+
+     case 3:
+      throw "Error";
+    }
+    return dimension;
+  };
+  this.findAlignmentInRegion = function(overallEstModuleSize, estAlignmentX, estAlignmentY, allowanceFactor) {
+    let allowance = Math.floor(allowanceFactor * overallEstModuleSize);
+    let alignmentAreaLeftX = Math.max(0, estAlignmentX - allowance);
+    let alignmentAreaRightX = Math.min(imgWidth - 1, estAlignmentX + allowance);
+    if (alignmentAreaRightX - alignmentAreaLeftX < overallEstModuleSize * 3) {
+      throw "Error";
+    }
+    let alignmentAreaTopY = Math.max(0, estAlignmentY - allowance);
+    let alignmentAreaBottomY = Math.min(imgHeight - 1, estAlignmentY + allowance);
+    let alignmentFinder = new AlignmentPatternFinder(this.image, alignmentAreaLeftX, alignmentAreaTopY, alignmentAreaRightX - alignmentAreaLeftX, alignmentAreaBottomY - alignmentAreaTopY, overallEstModuleSize, this.resultPointCallback);
+    return alignmentFinder.find();
+  };
+  this.createTransform = function(topLeft, topRight, bottomLeft, alignmentPattern, dimension) {
+    let dimMinusThree = dimension - 3.5;
+    let bottomRightX;
+    let bottomRightY;
+    let sourceBottomRightX;
+    let sourceBottomRightY;
+    if (alignmentPattern !== null) {
+      bottomRightX = alignmentPattern.X;
+      bottomRightY = alignmentPattern.Y;
+      sourceBottomRightX = sourceBottomRightY = dimMinusThree - 3;
+    } else {
+      bottomRightX = topRight.X - topLeft.X + bottomLeft.X;
+      bottomRightY = topRight.Y - topLeft.Y + bottomLeft.Y;
+      sourceBottomRightX = sourceBottomRightY = dimMinusThree;
+    }
+    let transform = PerspectiveTransform.quadrilateralToQuadrilateral(3.5, 3.5, dimMinusThree, 3.5, sourceBottomRightX, sourceBottomRightY, 3.5, dimMinusThree, topLeft.X, topLeft.Y, topRight.X, topRight.Y, bottomRightX, bottomRightY, bottomLeft.X, bottomLeft.Y);
+    return transform;
+  };
+  this.sampleGrid = function(image, transform, dimension) {
+    let sampler = GridSampler;
+    return sampler.sampleGrid3(image, dimension, transform);
+  };
+  this.processFinderPatternInfo = function(info) {
+    let topLeft = info.TopLeft;
+    let topRight = info.TopRight;
+    let bottomLeft = info.BottomLeft;
+    let moduleSize = this.calculateModuleSize(topLeft, topRight, bottomLeft);
+    if (moduleSize < 1) {
+      throw "Error";
+    }
+    let dimension = this.computeDimension(topLeft, topRight, bottomLeft, moduleSize);
+    let provisionalVersion = Version.getProvisionalVersionForDimension(dimension);
+    let modulesBetweenFPCenters = provisionalVersion.DimensionForVersion - 7;
+    let alignmentPattern = null;
+    if (provisionalVersion.AlignmentPatternCenters.length > 0) {
+      let bottomRightX = topRight.X - topLeft.X + bottomLeft.X;
+      let bottomRightY = topRight.Y - topLeft.Y + bottomLeft.Y;
+      let correctionToTopLeft = 1 - 3 / modulesBetweenFPCenters;
+      let estAlignmentX = Math.floor(topLeft.X + correctionToTopLeft * (bottomRightX - topLeft.X));
+      let estAlignmentY = Math.floor(topLeft.Y + correctionToTopLeft * (bottomRightY - topLeft.Y));
+      for (let i = 4; i <= 16; i <<= 1) {
+        alignmentPattern = this.findAlignmentInRegion(moduleSize, estAlignmentX, estAlignmentY, i);
+        break;
+      }
+    }
+    let transform = this.createTransform(topLeft, topRight, bottomLeft, alignmentPattern, dimension);
+    let bits = this.sampleGrid(this.image, transform, dimension);
+    let points;
+    if (alignmentPattern === null) {
+      points = new Array(bottomLeft, topLeft, topRight);
+    } else {
+      points = new Array(bottomLeft, topLeft, topRight, alignmentPattern);
+    }
+    return new DetectorResult(bits, points);
+  };
+  this.detect = function() {
+    let info = new FinderPatternFinder().findFinderPattern(this.image);
+    return this.processFinderPatternInfo(info);
+  };
+}
+
+var FORMAT_INFO_MASK_QR = 21522;
+
+var FORMAT_INFO_DECODE_LOOKUP = new Array(new Array(21522, 0), new Array(20773, 1), new Array(24188, 2), new Array(23371, 3), new Array(17913, 4), new Array(16590, 5), new Array(20375, 6), new Array(19104, 7), new Array(30660, 8), new Array(29427, 9), new Array(32170, 10), new Array(30877, 11), new Array(26159, 12), new Array(25368, 13), new Array(27713, 14), new Array(26998, 15), new Array(5769, 16), new Array(5054, 17), new Array(7399, 18), new Array(6608, 19), new Array(1890, 20), new Array(597, 21), new Array(3340, 22), new Array(2107, 23), new Array(13663, 24), new Array(12392, 25), new Array(16177, 26), new Array(14854, 27), new Array(9396, 28), new Array(8579, 29), new Array(11994, 30), new Array(11245, 31));
+
+var BITS_SET_IN_HALF_BYTE = new Array(0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4);
+
+function FormatInformation(formatInfo) {
+  this.errorCorrectionLevel = ErrorCorrectionLevel.forBits(formatInfo >> 3 & 3);
+  this.dataMask = formatInfo & 7;
+  this.__defineGetter__("ErrorCorrectionLevel", function() {
+    return this.errorCorrectionLevel;
+  });
+  this.__defineGetter__("DataMask", function() {
+    return this.dataMask;
+  });
+  this.GetHashCode = function() {
+    return this.errorCorrectionLevel.ordinal() << 3 | this.dataMask;
+  };
+  this.Equals = function(o) {
+    let other = o;
+    return this.errorCorrectionLevel == other.errorCorrectionLevel && this.dataMask == other.dataMask;
+  };
+}
+
+FormatInformation.numBitsDiffering = function(a, b) {
+  a ^= b;
+  return BITS_SET_IN_HALF_BYTE[a & 15] + BITS_SET_IN_HALF_BYTE[URShift(a, 4) & 15] + BITS_SET_IN_HALF_BYTE[URShift(a, 8) & 15] + BITS_SET_IN_HALF_BYTE[URShift(a, 12) & 15] + BITS_SET_IN_HALF_BYTE[URShift(a, 16) & 15] + BITS_SET_IN_HALF_BYTE[URShift(a, 20) & 15] + BITS_SET_IN_HALF_BYTE[URShift(a, 24) & 15] + BITS_SET_IN_HALF_BYTE[URShift(a, 28) & 15];
+};
+
+FormatInformation.decodeFormatInformation = function(maskedFormatInfo) {
+  let formatInfo = FormatInformation.doDecodeFormatInformation(maskedFormatInfo);
+  if (formatInfo !== null) {
+    return formatInfo;
+  }
+  return FormatInformation.doDecodeFormatInformation(maskedFormatInfo ^ FORMAT_INFO_MASK_QR);
+};
+
+FormatInformation.doDecodeFormatInformation = function(maskedFormatInfo) {
+  let bestDifference = 4294967295;
+  let bestFormatInfo = 0;
+  for (let i = 0; i < FORMAT_INFO_DECODE_LOOKUP.length; i++) {
+    let decodeInfo = FORMAT_INFO_DECODE_LOOKUP[i];
+    let targetInfo = decodeInfo[0];
+    if (targetInfo == maskedFormatInfo) {
+      return new FormatInformation(decodeInfo[1]);
+    }
+    let bitsDifference = this.numBitsDiffering(maskedFormatInfo, targetInfo);
+    if (bitsDifference < bestDifference) {
+      bestFormatInfo = decodeInfo[1];
+      bestDifference = bitsDifference;
+    }
+  }
+  if (bestDifference <= 3) {
+    return new FormatInformation(bestFormatInfo);
+  }
+  return null;
+};
+
+function ErrorCorrectionLevel(ordinal, bits, name) {
+  this.ordinal_Renamed_Field = ordinal;
+  this.bits = bits;
+  this.name = name;
+  this.__defineGetter__("Bits", function() {
+    return this.bits;
+  });
+  this.__defineGetter__("Name", function() {
+    return this.name;
+  });
+  this.ordinal = function() {
+    return this.ordinal_Renamed_Field;
+  };
+}
+
+var L = new ErrorCorrectionLevel(0, 1, "L");
+
+var M = new ErrorCorrectionLevel(1, 0, "M");
+
+var Q = new ErrorCorrectionLevel(2, 3, "Q");
+
+var H = new ErrorCorrectionLevel(3, 2, "H");
+
+var FOR_BITS = new Array(M, L, H, Q);
+
+ErrorCorrectionLevel.forBits = function(bits) {
+  if (bits < 0 || bits >= FOR_BITS.length) {
+    throw "ArgumentException";
+  }
+  return FOR_BITS[bits];
+};
+
+function BitMatrix(width, height) {
+  if (!height) height = width;
+  if (width < 1 || height < 1) {
+    throw "Both dimensions must be greater than 0";
+  }
+  this.width = width;
+  this.height = height;
+  let rowSize = width >> 5;
+  if ((width & 31) !== 0) {
+    rowSize++;
+  }
+  this.rowSize = rowSize;
+  this.bits = new Array(rowSize * height);
+  for (let i = 0; i < this.bits.length; i++) this.bits[i] = 0;
+  this.__defineGetter__("Width", function() {
+    return this.width;
+  });
+  this.__defineGetter__("Height", function() {
+    return this.height;
+  });
+  this.__defineGetter__("Dimension", function() {
+    if (this.width != this.height) {
+      throw "Can't call getDimension() on a non-square matrix";
+    }
+    return this.width;
+  });
+  this.get_Renamed = function(x, y) {
+    let offset = y * this.rowSize + (x >> 5);
+    return (URShift(this.bits[offset], x & 31) & 1) !== 0;
+  };
+  this.set_Renamed = function(x, y) {
+    let offset = y * this.rowSize + (x >> 5);
+    this.bits[offset] |= 1 << (x & 31);
+  };
+  this.flip = function(x, y) {
+    let offset = y * this.rowSize + (x >> 5);
+    this.bits[offset] ^= 1 << (x & 31);
+  };
+  this.clear = function() {
+    let max = this.bits.length;
+    for (let i = 0; i < max; i++) {
+      this.bits[i] = 0;
+    }
+  };
+  this.setRegion = function(left, top, width, height) {
+    if (top < 0 || left < 0) {
+      throw "Left and top must be nonnegative";
+    }
+    if (height < 1 || width < 1) {
+      throw "Height and width must be at least 1";
+    }
+    let right = left + width;
+    let bottom = top + height;
+    if (bottom > this.height || right > this.width) {
+      throw "The region must fit inside the matrix";
+    }
+    for (let y = top; y < bottom; y++) {
+      let offset = y * this.rowSize;
+      for (let x = left; x < right; x++) {
+        this.bits[offset + (x >> 5)] |= 1 << (x & 31);
+      }
+    }
+  };
+}
+
+function DataBlock(numDataCodewords, codewords) {
+  this.numDataCodewords = numDataCodewords;
+  this.codewords = codewords;
+  this.__defineGetter__("NumDataCodewords", function() {
+    return this.numDataCodewords;
+  });
+  this.__defineGetter__("Codewords", function() {
+    return this.codewords;
+  });
+}
+
+DataBlock.getDataBlocks = function(rawCodewords, version, ecLevel) {
+  if (rawCodewords.length != version.TotalCodewords) {
+    throw "ArgumentException";
+  }
+  let ecBlocks = version.getECBlocksForLevel(ecLevel);
+  let totalBlocks = 0;
+  let ecBlockArray = ecBlocks.getECBlocks();
+  for (let i = 0; i < ecBlockArray.length; i++) {
+    totalBlocks += ecBlockArray[i].Count;
+  }
+  let result = new Array(totalBlocks);
+  let numResultBlocks = 0;
+  for (let j = 0; j < ecBlockArray.length; j++) {
+    let ecBlock = ecBlockArray[j];
+    for (let i = 0; i < ecBlock.Count; i++) {
+      let numDataCodewords = ecBlock.DataCodewords;
+      let numBlockCodewords = ecBlocks.ECCodewordsPerBlock + numDataCodewords;
+      result[numResultBlocks++] = new DataBlock(numDataCodewords, new Array(numBlockCodewords));
+    }
+  }
+  let shorterBlocksTotalCodewords = result[0].codewords.length;
+  let longerBlocksStartAt = result.length - 1;
+  while (longerBlocksStartAt >= 0) {
+    let numCodewords = result[longerBlocksStartAt].codewords.length;
+    if (numCodewords == shorterBlocksTotalCodewords) {
+      break;
+    }
+    longerBlocksStartAt--;
+  }
+  longerBlocksStartAt++;
+  let shorterBlocksNumDataCodewords = shorterBlocksTotalCodewords - ecBlocks.ECCodewordsPerBlock;
+  let rawCodewordsOffset = 0;
+  for (let i = 0; i < shorterBlocksNumDataCodewords; i++) {
+    for (let j = 0; j < numResultBlocks; j++) {
+      result[j].codewords[i] = rawCodewords[rawCodewordsOffset++];
+    }
+  }
+  for (let j = longerBlocksStartAt; j < numResultBlocks; j++) {
+    result[j].codewords[shorterBlocksNumDataCodewords] = rawCodewords[rawCodewordsOffset++];
+  }
+  let max = result[0].codewords.length;
+  for (let i = shorterBlocksNumDataCodewords; i < max; i++) {
+    for (let j = 0; j < numResultBlocks; j++) {
+      let iOffset = j < longerBlocksStartAt ? i : i + 1;
+      result[j].codewords[iOffset] = rawCodewords[rawCodewordsOffset++];
+    }
+  }
+  return result;
+};
+
+var DataMask = {};
+
+function BitMatrixParser(bitMatrix) {
+  let dimension = bitMatrix.Dimension;
+  if (dimension < 21 || (dimension & 3) != 1) {
+    throw "Error BitMatrixParser";
+  }
+  this.bitMatrix = bitMatrix;
+  this.parsedVersion = null;
+  this.parsedFormatInfo = null;
+  this.copyBit = function(i, j, versionBits) {
+    return this.bitMatrix.get_Renamed(i, j) ? versionBits << 1 | 1 : versionBits << 1;
+  };
+  this.readFormatInformation = function() {
+    if (this.parsedFormatInfo !== null) {
+      return this.parsedFormatInfo;
+    }
+    let formatInfoBits = 0;
+    for (let i = 0; i < 6; i++) {
+      formatInfoBits = this.copyBit(i, 8, formatInfoBits);
+    }
+    formatInfoBits = this.copyBit(7, 8, formatInfoBits);
+    formatInfoBits = this.copyBit(8, 8, formatInfoBits);
+    formatInfoBits = this.copyBit(8, 7, formatInfoBits);
+    for (let j = 5; j >= 0; j--) {
+      formatInfoBits = this.copyBit(8, j, formatInfoBits);
+    }
+    this.parsedFormatInfo = FormatInformation.decodeFormatInformation(formatInfoBits);
+    if (this.parsedFormatInfo !== null) {
+      return this.parsedFormatInfo;
+    }
+    let dimension = this.bitMatrix.Dimension;
+    formatInfoBits = 0;
+    let iMin = dimension - 8;
+    for (let i = dimension - 1; i >= iMin; i--) {
+      formatInfoBits = this.copyBit(i, 8, formatInfoBits);
+    }
+    for (let j = dimension - 7; j < dimension; j++) {
+      formatInfoBits = this.copyBit(8, j, formatInfoBits);
+    }
+    this.parsedFormatInfo = FormatInformation.decodeFormatInformation(formatInfoBits);
+    if (this.parsedFormatInfo !== null) {
+      return this.parsedFormatInfo;
+    }
+    throw "Error readFormatInformation";
+  };
+  this.readVersion = function() {
+    if (this.parsedVersion !== null) {
+      return this.parsedVersion;
+    }
+    let dimension = this.bitMatrix.Dimension;
+    let provisionalVersion = dimension - 17 >> 2;
+    if (provisionalVersion <= 6) {
+      return Version.getVersionForNumber(provisionalVersion);
+    }
+    let versionBits = 0;
+    let ijMin = dimension - 11;
+    for (let j = 5; j >= 0; j--) {
+      for (let i = dimension - 9; i >= ijMin; i--) {
+        versionBits = this.copyBit(i, j, versionBits);
+      }
+    }
+    this.parsedVersion = Version.decodeVersionInformation(versionBits);
+    if (this.parsedVersion !== null && this.parsedVersion.DimensionForVersion == dimension) {
+      return this.parsedVersion;
+    }
+    versionBits = 0;
+    for (let i = 5; i >= 0; i--) {
+      for (let j = dimension - 9; j >= ijMin; j--) {
+        versionBits = this.copyBit(i, j, versionBits);
+      }
+    }
+    this.parsedVersion = Version.decodeVersionInformation(versionBits);
+    if (this.parsedVersion !== null && this.parsedVersion.DimensionForVersion == dimension) {
+      return this.parsedVersion;
+    }
+    throw "Error readVersion";
+  };
+  this.readCodewords = function() {
+    let formatInfo = this.readFormatInformation();
+    let version = this.readVersion();
+    let dataMask = DataMask.forReference(formatInfo.DataMask);
+    let dimension = this.bitMatrix.Dimension;
+    dataMask.unmaskBitMatrix(this.bitMatrix, dimension);
+    let functionPattern = version.buildFunctionPattern();
+    let readingUp = true;
+    let result = new Array(version.TotalCodewords);
+    let resultOffset = 0;
+    let currentByte = 0;
+    let bitsRead = 0;
+    for (let j = dimension - 1; j > 0; j -= 2) {
+      if (j == 6) {
+        j--;
+      }
+      for (let count = 0; count < dimension; count++) {
+        let i = readingUp ? dimension - 1 - count : count;
+        for (let col = 0; col < 2; col++) {
+          if (!functionPattern.get_Renamed(j - col, i)) {
+            bitsRead++;
+            currentByte <<= 1;
+            if (this.bitMatrix.get_Renamed(j - col, i)) {
+              currentByte |= 1;
+            }
+            if (bitsRead == 8) {
+              result[resultOffset++] = currentByte;
+              bitsRead = 0;
+              currentByte = 0;
+            }
+          }
+        }
+      }
+      readingUp ^= true;
+    }
+    if (resultOffset != version.TotalCodewords) {
+      throw "Error readCodewords";
+    }
+    return result;
+  };
+}
+
+DataMask.forReference = function(reference) {
+  if (reference < 0 || reference > 7) {
+    throw "System.ArgumentException";
+  }
+  return DataMask.DATA_MASKS[reference];
+};
+
+function DataMask000() {
+  this.unmaskBitMatrix = function(bits, dimension) {
+    for (let i = 0; i < dimension; i++) {
+      for (let j = 0; j < dimension; j++) {
+        if (this.isMasked(i, j)) {
+          bits.flip(j, i);
+        }
+      }
+    }
+  };
+  this.isMasked = function(i, j) {
+    return (i + j & 1) === 0;
+  };
+}
+
+function DataMask001() {
+  this.unmaskBitMatrix = function(bits, dimension) {
+    for (let i = 0; i < dimension; i++) {
+      for (let j = 0; j < dimension; j++) {
+        if (this.isMasked(i, j)) {
+          bits.flip(j, i);
+        }
+      }
+    }
+  };
+  this.isMasked = function(i, j) {
+    return (i & 1) === 0;
+  };
+}
+
+function DataMask010() {
+  this.unmaskBitMatrix = function(bits, dimension) {
+    for (let i = 0; i < dimension; i++) {
+      for (let j = 0; j < dimension; j++) {
+        if (this.isMasked(i, j)) {
+          bits.flip(j, i);
+        }
+      }
+    }
+  };
+  this.isMasked = function(i, j) {
+    return j % 3 === 0;
+  };
+}
+
+function DataMask011() {
+  this.unmaskBitMatrix = function(bits, dimension) {
+    for (let i = 0; i < dimension; i++) {
+      for (let j = 0; j < dimension; j++) {
+        if (this.isMasked(i, j)) {
+          bits.flip(j, i);
+        }
+      }
+    }
+  };
+  this.isMasked = function(i, j) {
+    return (i + j) % 3 === 0;
+  };
+}
+
+function DataMask100() {
+  this.unmaskBitMatrix = function(bits, dimension) {
+    for (let i = 0; i < dimension; i++) {
+      for (let j = 0; j < dimension; j++) {
+        if (this.isMasked(i, j)) {
+          bits.flip(j, i);
+        }
+      }
+    }
+  };
+  this.isMasked = function(i, j) {
+    return (URShift(i, 1) + j / 3 & 1) === 0;
+  };
+}
+
+function DataMask101() {
+  this.unmaskBitMatrix = function(bits, dimension) {
+    for (let i = 0; i < dimension; i++) {
+      for (let j = 0; j < dimension; j++) {
+        if (this.isMasked(i, j)) {
+          bits.flip(j, i);
+        }
+      }
+    }
+  };
+  this.isMasked = function(i, j) {
+    let temp = i * j;
+    return (temp & 1) + temp % 3 === 0;
+  };
+}
+
+function DataMask110() {
+  this.unmaskBitMatrix = function(bits, dimension) {
+    for (let i = 0; i < dimension; i++) {
+      for (let j = 0; j < dimension; j++) {
+        if (this.isMasked(i, j)) {
+          bits.flip(j, i);
+        }
+      }
+    }
+  };
+  this.isMasked = function(i, j) {
+    let temp = i * j;
+    return ((temp & 1) + temp % 3 & 1) === 0;
+  };
+}
+
+function DataMask111() {
+  this.unmaskBitMatrix = function(bits, dimension) {
+    for (let i = 0; i < dimension; i++) {
+      for (let j = 0; j < dimension; j++) {
+        if (this.isMasked(i, j)) {
+          bits.flip(j, i);
+        }
+      }
+    }
+  };
+  this.isMasked = function(i, j) {
+    return ((i + j & 1) + i * j % 3 & 1) === 0;
+  };
+}
+
+DataMask.DATA_MASKS = new Array(new DataMask000(), new DataMask001(), new DataMask010(), new DataMask011(), new DataMask100(), new DataMask101(), new DataMask110(), new DataMask111());
+
+function ReedSolomonDecoder(field) {
+  this.field = field;
+  this.decode = function(received, twoS) {
+    let poly = new GF256Poly(this.field, received);
+    let syndromeCoefficients = new Array(twoS);
+    for (let i = 0; i < syndromeCoefficients.length; i++) syndromeCoefficients[i] = 0;
+    let dataMatrix = false;
+    let noError = true;
+    for (let i = 0; i < twoS; i++) {
+      let value = poly.evaluateAt(this.field.exp(dataMatrix ? i + 1 : i));
+      syndromeCoefficients[syndromeCoefficients.length - 1 - i] = value;
+      if (value !== 0) {
+        noError = false;
+      }
+    }
+    if (noError) {
+      return;
+    }
+    let syndrome = new GF256Poly(this.field, syndromeCoefficients);
+    let sigmaOmega = this.runEuclideanAlgorithm(this.field.buildMonomial(twoS, 1), syndrome, twoS);
+    let sigma = sigmaOmega[0];
+    let omega = sigmaOmega[1];
+    let errorLocations = this.findErrorLocations(sigma);
+    let errorMagnitudes = this.findErrorMagnitudes(omega, errorLocations, dataMatrix);
+    for (let i = 0; i < errorLocations.length; i++) {
+      let position = received.length - 1 - this.field.log(errorLocations[i]);
+      if (position < 0) {
+        throw "ReedSolomonException Bad error location";
+      }
+      received[position] = GF256.addOrSubtract(received[position], errorMagnitudes[i]);
+    }
+  };
+  this.runEuclideanAlgorithm = function(a, b, R) {
+    if (a.Degree < b.Degree) {
+      let temp = a;
+      a = b;
+      b = temp;
+    }
+    let rLast = a;
+    let r = b;
+    let sLast = this.field.One;
+    let s = this.field.Zero;
+    let tLast = this.field.Zero;
+    let t = this.field.One;
+    while (r.Degree >= Math.floor(R / 2)) {
+      let rLastLast = rLast;
+      let sLastLast = sLast;
+      let tLastLast = tLast;
+      rLast = r;
+      sLast = s;
+      tLast = t;
+      if (rLast.Zero) {
+        throw "r_{i-1} was zero";
+      }
+      r = rLastLast;
+      let q = this.field.Zero;
+      let denominatorLeadingTerm = rLast.getCoefficient(rLast.Degree);
+      let dltInverse = this.field.inverse(denominatorLeadingTerm);
+      while (r.Degree >= rLast.Degree && !r.Zero) {
+        let degreeDiff = r.Degree - rLast.Degree;
+        let scale = this.field.multiply(r.getCoefficient(r.Degree), dltInverse);
+        q = q.addOrSubtract(this.field.buildMonomial(degreeDiff, scale));
+        r = r.addOrSubtract(rLast.multiplyByMonomial(degreeDiff, scale));
+      }
+      s = q.multiply1(sLast).addOrSubtract(sLastLast);
+      t = q.multiply1(tLast).addOrSubtract(tLastLast);
+    }
+    let sigmaTildeAtZero = t.getCoefficient(0);
+    if (sigmaTildeAtZero === 0) {
+      throw "ReedSolomonException sigmaTilde(0) was zero";
+    }
+    let inverse = this.field.inverse(sigmaTildeAtZero);
+    let sigma = t.multiply2(inverse);
+    let omega = r.multiply2(inverse);
+    return new Array(sigma, omega);
+  };
+  this.findErrorLocations = function(errorLocator) {
+    let numErrors = errorLocator.Degree;
+    if (numErrors == 1) {
+      return new Array(errorLocator.getCoefficient(1));
+    }
+    let result = new Array(numErrors);
+    let e = 0;
+    for (let i = 1; i < 256 && e < numErrors; i++) {
+      if (errorLocator.evaluateAt(i) === 0) {
+        result[e] = this.field.inverse(i);
+        e++;
+      }
+    }
+    if (e != numErrors) {
+      throw "Error locator degree does not match number of roots";
+    }
+    return result;
+  };
+  this.findErrorMagnitudes = function(errorEvaluator, errorLocations, dataMatrix) {
+    let s = errorLocations.length;
+    let result = new Array(s);
+    for (let i = 0; i < s; i++) {
+      let xiInverse = this.field.inverse(errorLocations[i]);
+      let denominator = 1;
+      for (let j = 0; j < s; j++) {
+        if (i != j) {
+          denominator = this.field.multiply(denominator, GF256.addOrSubtract(1, this.field.multiply(errorLocations[j], xiInverse)));
+        }
+      }
+      result[i] = this.field.multiply(errorEvaluator.evaluateAt(xiInverse), this.field.inverse(denominator));
+      if (dataMatrix) {
+        result[i] = this.field.multiply(result[i], xiInverse);
+      }
+    }
+    return result;
+  };
+}
+
+function GF256Poly(field, coefficients) {
+  if (coefficients === null || coefficients.length === 0) {
+    throw "System.ArgumentException";
+  }
+  this.field = field;
+  let coefficientsLength = coefficients.length;
+  if (coefficientsLength > 1 && coefficients[0] === 0) {
+    let firstNonZero = 1;
+    while (firstNonZero < coefficientsLength && coefficients[firstNonZero] === 0) {
+      firstNonZero++;
+    }
+    if (firstNonZero == coefficientsLength) {
+      this.coefficients = field.Zero.coefficients;
+    } else {
+      this.coefficients = new Array(coefficientsLength - firstNonZero);
+      for (let i = 0; i < this.coefficients.length; i++) this.coefficients[i] = 0;
+      for (let ci = 0; ci < this.coefficients.length; ci++) this.coefficients[ci] = coefficients[firstNonZero + ci];
+    }
+  } else {
+    this.coefficients = coefficients;
+  }
+  this.__defineGetter__("Zero", function() {
+    return this.coefficients[0] === 0;
+  });
+  this.__defineGetter__("Degree", function() {
+    return this.coefficients.length - 1;
+  });
+  this.__defineGetter__("Coefficients", function() {
+    return this.coefficients;
+  });
+  this.getCoefficient = function(degree) {
+    return this.coefficients[this.coefficients.length - 1 - degree];
+  };
+  this.evaluateAt = function(a) {
+    if (a === 0) {
+      return this.getCoefficient(0);
+    }
+    let size = this.coefficients.length;
+    if (a == 1) {
+      let result = 0;
+      for (let i = 0; i < size; i++) {
+        result = GF256.addOrSubtract(result, this.coefficients[i]);
+      }
+      return result;
+    }
+    let result2 = this.coefficients[0];
+    for (let i = 1; i < size; i++) {
+      result2 = GF256.addOrSubtract(this.field.multiply(a, result2), this.coefficients[i]);
+    }
+    return result2;
+  };
+  this.addOrSubtract = function(other) {
+    if (this.field != other.field) {
+      throw "GF256Polys do not have same GF256 field";
+    }
+    if (this.Zero) {
+      return other;
+    }
+    if (other.Zero) {
+      return this;
+    }
+    let smallerCoefficients = this.coefficients;
+    let largerCoefficients = other.coefficients;
+    if (smallerCoefficients.length > largerCoefficients.length) {
+      let temp = smallerCoefficients;
+      smallerCoefficients = largerCoefficients;
+      largerCoefficients = temp;
+    }
+    let sumDiff = new Array(largerCoefficients.length);
+    let lengthDiff = largerCoefficients.length - smallerCoefficients.length;
+    for (let ci = 0; ci < lengthDiff; ci++) sumDiff[ci] = largerCoefficients[ci];
+    for (let i = lengthDiff; i < largerCoefficients.length; i++) {
+      sumDiff[i] = GF256.addOrSubtract(smallerCoefficients[i - lengthDiff], largerCoefficients[i]);
+    }
+    return new GF256Poly(field, sumDiff);
+  };
+  this.multiply1 = function(other) {
+    if (this.field != other.field) {
+      throw "GF256Polys do not have same GF256 field";
+    }
+    if (this.Zero || other.Zero) {
+      return this.field.Zero;
+    }
+    let aCoefficients = this.coefficients;
+    let aLength = aCoefficients.length;
+    let bCoefficients = other.coefficients;
+    let bLength = bCoefficients.length;
+    let product = new Array(aLength + bLength - 1);
+    for (let i = 0; i < aLength; i++) {
+      let aCoeff = aCoefficients[i];
+      for (let j = 0; j < bLength; j++) {
+        product[i + j] = GF256.addOrSubtract(product[i + j], this.field.multiply(aCoeff, bCoefficients[j]));
+      }
+    }
+    return new GF256Poly(this.field, product);
+  };
+  this.multiply2 = function(scalar) {
+    if (scalar === 0) {
+      return this.field.Zero;
+    }
+    if (scalar == 1) {
+      return this;
+    }
+    let size = this.coefficients.length;
+    let product = new Array(size);
+    for (let i = 0; i < size; i++) {
+      product[i] = this.field.multiply(this.coefficients[i], scalar);
+    }
+    return new GF256Poly(this.field, product);
+  };
+  this.multiplyByMonomial = function(degree, coefficient) {
+    if (degree < 0) {
+      throw "System.ArgumentException";
+    }
+    if (coefficient === 0) {
+      return this.field.Zero;
+    }
+    let size = this.coefficients.length;
+    let product = new Array(size + degree);
+    for (let i = 0; i < product.length; i++) product[i] = 0;
+    for (let i = 0; i < size; i++) {
+      product[i] = this.field.multiply(this.coefficients[i], coefficient);
+    }
+    return new GF256Poly(this.field, product);
+  };
+  this.divide = function(other) {
+    if (this.field != other.field) {
+      throw "GF256Polys do not have same GF256 field";
+    }
+    if (other.Zero) {
+      throw "Divide by 0";
+    }
+    let quotient = this.field.Zero;
+    let remainder = this;
+    let denominatorLeadingTerm = other.getCoefficient(other.Degree);
+    let inverseDenominatorLeadingTerm = this.field.inverse(denominatorLeadingTerm);
+    while (remainder.Degree >= other.Degree && !remainder.Zero) {
+      let degreeDifference = remainder.Degree - other.Degree;
+      let scale = this.field.multiply(remainder.getCoefficient(remainder.Degree), inverseDenominatorLeadingTerm);
+      let term = other.multiplyByMonomial(degreeDifference, scale);
+      let iterationQuotient = this.field.buildMonomial(degreeDifference, scale);
+      quotient = quotient.addOrSubtract(iterationQuotient);
+      remainder = remainder.addOrSubtract(term);
+    }
+    return new Array(quotient, remainder);
+  };
+}
+
+function GF256(primitive) {
+  this.expTable = new Array(256);
+  this.logTable = new Array(256);
+  let x = 1;
+  for (let i = 0; i < 256; i++) {
+    this.expTable[i] = x;
+    x <<= 1;
+    if (x >= 256) {
+      x ^= primitive;
+    }
+  }
+  for (let i = 0; i < 255; i++) {
+    this.logTable[this.expTable[i]] = i;
+  }
+  let at0 = new Array(1);
+  at0[0] = 0;
+  this.zero = new GF256Poly(this, new Array(at0));
+  let at1 = new Array(1);
+  at1[0] = 1;
+  this.one = new GF256Poly(this, new Array(at1));
+  this.__defineGetter__("Zero", function() {
+    return this.zero;
+  });
+  this.__defineGetter__("One", function() {
+    return this.one;
+  });
+  this.buildMonomial = function(degree, coefficient) {
+    if (degree < 0) {
+      throw "System.ArgumentException";
+    }
+    if (coefficient === 0) {
+      return this.zero;
+    }
+    let coefficients = new Array(degree + 1);
+    for (let i = 0; i < coefficients.length; i++) coefficients[i] = 0;
+    coefficients[0] = coefficient;
+    return new GF256Poly(this, coefficients);
+  };
+  this.exp = function(a) {
+    return this.expTable[a];
+  };
+  this.log = function(a) {
+    if (a === 0) {
+      throw "System.ArgumentException";
+    }
+    return this.logTable[a];
+  };
+  this.inverse = function(a) {
+    if (a === 0) {
+      throw "System.ArithmeticException";
+    }
+    return this.expTable[255 - this.logTable[a]];
+  };
+  this.multiply = function(a, b) {
+    if (a === 0 || b === 0) {
+      return 0;
+    }
+    if (a == 1) {
+      return b;
+    }
+    if (b == 1) {
+      return a;
+    }
+    return this.expTable[(this.logTable[a] + this.logTable[b]) % 255];
+  };
+}
+
+GF256.QR_CODE_FIELD = new GF256(285);
+
+GF256.DATA_MATRIX_FIELD = new GF256(301);
+
+GF256.addOrSubtract = function(a, b) {
+  return a ^ b;
+};
+
+var Decoder = {};
+
+Decoder.rsDecoder = new ReedSolomonDecoder(GF256.QR_CODE_FIELD);
+
+Decoder.correctErrors = function(codewordBytes, numDataCodewords) {
+  let numCodewords = codewordBytes.length;
+  let codewordsInts = new Array(numCodewords);
+  for (let i = 0; i < numCodewords; i++) {
+    codewordsInts[i] = codewordBytes[i] & 255;
+  }
+  let numECCodewords = codewordBytes.length - numDataCodewords;
+  try {
+    Decoder.rsDecoder.decode(codewordsInts, numECCodewords);
+  } catch (rse) {
+    throw rse;
+  }
+  for (let i = 0; i < numDataCodewords; i++) {
+    codewordBytes[i] = codewordsInts[i];
+  }
+};
+
+Decoder.decode = function(bits) {
+  let parser = new BitMatrixParser(bits);
+  let version = parser.readVersion();
+  let ecLevel = parser.readFormatInformation().ErrorCorrectionLevel;
+  let codewords = parser.readCodewords();
+  let dataBlocks = DataBlock.getDataBlocks(codewords, version, ecLevel);
+  let totalBytes = 0;
+  for (let i = 0; i < dataBlocks.length; i++) {
+    totalBytes += dataBlocks[i].NumDataCodewords;
+  }
+  let resultBytes = new Array(totalBytes);
+  let resultOffset = 0;
+  for (let j = 0; j < dataBlocks.length; j++) {
+    let dataBlock = dataBlocks[j];
+    let codewordBytes = dataBlock.Codewords;
+    let numDataCodewords = dataBlock.NumDataCodewords;
+    Decoder.correctErrors(codewordBytes, numDataCodewords);
+    for (let i = 0; i < numDataCodewords; i++) {
+      resultBytes[resultOffset++] = codewordBytes[i];
+    }
+  }
+  let reader = new QRCodeDataBlockReader(resultBytes, version.VersionNumber, ecLevel.Bits);
+  return reader;
+};
+
+// mozilla: Get access to a window
+var Services = require("Services");
+
+var DebuggerServer = require("devtools/server/main").DebuggerServer;
+
+var window = Services.wm.getMostRecentWindow(DebuggerServer.chromeWindowType);
+
+var document = window.document;
+
+var Image = window.Image;
+
+var HTML_NS = "http://www.w3.org/1999/xhtml";
+
+var qrcode = {};
+
+qrcode.callback = null;
+
+qrcode.errback = null;
+
+qrcode.decode = function(src) {
+  if (arguments.length === 0) {
+    let canvas_qr = document.getElementById("qr-canvas");
+    let context = canvas_qr.getContext("2d");
+    imgWidth = canvas_qr.width;
+    imgHeight = canvas_qr.height;
+    imgU8 = context.getImageData(0, 0, imgWidth, imgHeight).data;
+    imgU32 = new Uint32Array(imgU8.buffer);
+    qrcode.result = qrcode.process(context);
+    if (qrcode.callback !== null) {
+      qrcode.callback(qrcode.result);
+    }
+    return qrcode.result;
+  } else {
+    let image = new Image();
+    image.onload = function() {
+      // mozilla: Use HTML namespace explicitly
+      let canvas_qr = document.createElementNS(HTML_NS, "canvas");
+      let context = canvas_qr.getContext("2d");
+      let nheight = image.height;
+      let nwidth = image.width;
+      if (image.width * image.height > maxImgSize) {
+        let ir = image.width / image.height;
+        nheight = Math.sqrt(maxImgSize / ir);
+        nwidth = ir * nheight;
+      }
+      canvas_qr.width = nwidth;
+      canvas_qr.height = nheight;
+      context.drawImage(image, 0, 0, canvas_qr.width, canvas_qr.height);
+      imgWidth = canvas_qr.width;
+      imgHeight = canvas_qr.height;
+      try {
+        imgU8 = context.getImageData(0, 0, canvas_qr.width, canvas_qr.height).data;
+        imgU32 = new Uint32Array(imgU8.buffer);
+      } catch (e) {
+        qrcode.result = "Cross domain image reading not supported in your browser! Save it to your computer then drag and drop the file!";
+        if (qrcode.callback !== null) {
+          qrcode.callback(qrcode.result);
+        }
+        return;
+      }
+      try {
+        qrcode.result = qrcode.process(context);
+        if (qrcode.callback !== null) {
+          qrcode.callback(qrcode.result);
+        }
+      } catch (e) {
+        if (qrcode.errback !== null) {
+          qrcode.errback(e);
+        } else {
+          console.error(e);
+        }
+        qrcode.result = "error decoding QR Code";
+      }
+    };
+    image.src = src;
+  }
+};
+
+qrcode.isUrl = function(s) {
+  let regexp = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/;
+  return regexp.test(s);
+};
+
+qrcode.decode_url = function(s) {
+  let escaped = "";
+  try {
+    escaped = escape(s);
+  } catch (e) {
+    console.log(e);
+    escaped = s;
+  }
+  let ret = "";
+  try {
+    ret = decodeURIComponent(escaped);
+  } catch (e) {
+    console.log(e);
+    ret = escaped;
+  }
+  return ret;
+};
+
+qrcode.decode_utf8 = function(s) {
+  if (qrcode.isUrl(s)) return qrcode.decode_url(s); else return s;
+};
+
+qrcode.process = function(ctx) {
+  let image = qrcode.grayScaleToBitmap(qrcode.grayscale());
+  let detector = new Detector(image);
+  let qRCodeMatrix = detector.detect();
+  let reader = Decoder.decode(qRCodeMatrix.bits);
+  let data = reader.DataByte;
+  let str = "";
+  for (let i = 0; i < data.length; i++) {
+    for (let j = 0; j < data[i].length; j++) str += String.fromCharCode(data[i][j]);
+  }
+  return qrcode.decode_utf8(str);
+};
+
+qrcode.getMiddleBrightnessPerArea = function(image) {
+  let numSqrtArea = 4;
+  let areaWidth = Math.floor(imgWidth / numSqrtArea);
+  let areaHeight = Math.floor(imgHeight / numSqrtArea);
+  let minmax = new Array(numSqrtArea);
+  for (let i = 0; i < numSqrtArea; i++) {
+    minmax[i] = new Array(numSqrtArea);
+    for (let i2 = 0; i2 < numSqrtArea; i2++) {
+      minmax[i][i2] = new Array(0, 0);
+    }
+  }
+  for (let ay = 0; ay < numSqrtArea; ay++) {
+    for (let ax = 0; ax < numSqrtArea; ax++) {
+      minmax[ax][ay][0] = 255;
+      for (let dy = 0; dy < areaHeight; dy++) {
+        for (let dx = 0; dx < areaWidth; dx++) {
+          let target = image[areaWidth * ax + dx + (areaHeight * ay + dy) * imgWidth];
+          if (target < minmax[ax][ay][0]) minmax[ax][ay][0] = target;
+          if (target > minmax[ax][ay][1]) minmax[ax][ay][1] = target;
+        }
+      }
+    }
+  }
+  let middle = new Array(numSqrtArea);
+  for (let i3 = 0; i3 < numSqrtArea; i3++) {
+    middle[i3] = new Array(numSqrtArea);
+  }
+  for (let ay = 0; ay < numSqrtArea; ay++) {
+    for (let ax = 0; ax < numSqrtArea; ax++) {
+      middle[ax][ay] = Math.floor((minmax[ax][ay][0] + minmax[ax][ay][1]) / 2);
+    }
+  }
+  return middle;
+};
+
+qrcode.grayScaleToBitmap = function(grayScale) {
+  let middle = qrcode.getMiddleBrightnessPerArea(grayScale);
+  let sqrtNumArea = middle.length;
+  let areaWidth = Math.floor(imgWidth / sqrtNumArea);
+  let areaHeight = Math.floor(imgHeight / sqrtNumArea);
+  let bitmap = new Array(imgHeight * imgWidth);
+  for (let ay = 0; ay < sqrtNumArea; ay++) {
+    for (let ax = 0; ax < sqrtNumArea; ax++) {
+      for (let dy = 0; dy < areaHeight; dy++) {
+        for (let dx = 0; dx < areaWidth; dx++) {
+          bitmap[areaWidth * ax + dx + (areaHeight * ay + dy) * imgWidth] = grayScale[areaWidth * ax + dx + (areaHeight * ay + dy) * imgWidth] < middle[ax][ay] ? true : false;
+        }
+      }
+    }
+  }
+  return bitmap;
+};
+
+qrcode.grayscale = function() {
+  let ret = new Uint8ClampedArray(imgWidth * imgHeight);
+  for (let y = 0; y < imgHeight; y++) {
+    for (let x = 0; x < imgWidth; x++) {
+      let point = x + y * imgWidth;
+      let rgba = imgU32[point];
+      let p = (rgba & 0xFF) + ((rgba >> 8) & 0xFF) + ((rgba >> 16) & 0xFF);
+      ret[x + y * imgWidth] = p / 3;
+    }
+  }
+  return ret;
+};
+
+function URShift(number, bits) {
+  if (number >= 0) return number >> bits; else return (number >> bits) + (2 << ~bits);
+}
+
+// mozilla: Add module support
+module.exports = {
+  decodeFromURI: function(src, cb, errcb) {
+    if (cb) {
+      qrcode.callback = cb;
+    }
+    if (errcb) {
+      qrcode.errback = errcb;
+    }
+    return qrcode.decode(src);
+  },
+  decodeFromCanvas: function(canvas, cb) {
+    let context = canvas.getContext("2d");
+    imgWidth = canvas.width;
+    imgHeight = canvas.height;
+    imgU8 = context.getImageData(0, 0, imgWidth, imgHeight).data;
+    imgU32 = new Uint32Array(imgU8.buffer);
+    let result = qrcode.process(context);
+    if (cb) {
+      cb(result);
+    }
+    return result;
+  }
+};
+
+var MIN_SKIP = 3;
+
+var MAX_MODULES = 57;
+
+var INTEGER_MATH_SHIFT = 8;
+
+var CENTER_QUORUM = 2;
+
+qrcode.orderBestPatterns = function(patterns) {
+  function distance(pattern1, pattern2) {
+    let xDiff = pattern1.X - pattern2.X;
+    let yDiff = pattern1.Y - pattern2.Y;
+    return Math.sqrt(xDiff * xDiff + yDiff * yDiff);
+  }
+  function crossProductZ(pointA, pointB, pointC) {
+    let bX = pointB.x;
+    let bY = pointB.y;
+    return (pointC.x - bX) * (pointA.y - bY) - (pointC.y - bY) * (pointA.x - bX);
+  }
+  let zeroOneDistance = distance(patterns[0], patterns[1]);
+  let oneTwoDistance = distance(patterns[1], patterns[2]);
+  let zeroTwoDistance = distance(patterns[0], patterns[2]);
+  let pointA, pointB, pointC;
+  if (oneTwoDistance >= zeroOneDistance && oneTwoDistance >= zeroTwoDistance) {
+    pointB = patterns[0];
+    pointA = patterns[1];
+    pointC = patterns[2];
+  } else if (zeroTwoDistance >= oneTwoDistance && zeroTwoDistance >= zeroOneDistance) {
+    pointB = patterns[1];
+    pointA = patterns[0];
+    pointC = patterns[2];
+  } else {
+    pointB = patterns[2];
+    pointA = patterns[0];
+    pointC = patterns[1];
+  }
+  if (crossProductZ(pointA, pointB, pointC) < 0) {
+    let temp = pointA;
+    pointA = pointC;
+    pointC = temp;
+  }
+  patterns[0] = pointA;
+  patterns[1] = pointB;
+  patterns[2] = pointC;
+};
+
+function FinderPattern(posX, posY, estimatedModuleSize) {
+  this.x = posX;
+  this.y = posY;
+  this.count = 1;
+  this.estimatedModuleSize = estimatedModuleSize;
+  this.__defineGetter__("EstimatedModuleSize", function() {
+    return this.estimatedModuleSize;
+  });
+  this.__defineGetter__("Count", function() {
+    return this.count;
+  });
+  this.__defineGetter__("X", function() {
+    return this.x;
+  });
+  this.__defineGetter__("Y", function() {
+    return this.y;
+  });
+  this.incrementCount = function() {
+    this.count++;
+  };
+  this.aboutEquals = function(moduleSize, i, j) {
+    if (Math.abs(i - this.y) <= moduleSize && Math.abs(j - this.x) <= moduleSize) {
+      let moduleSizeDiff = Math.abs(moduleSize - this.estimatedModuleSize);
+      return moduleSizeDiff <= 1 || moduleSizeDiff / this.estimatedModuleSize <= 1;
+    }
+    return false;
+  };
+}
+
+function FinderPatternInfo(patternCenters) {
+  this.bottomLeft = patternCenters[0];
+  this.topLeft = patternCenters[1];
+  this.topRight = patternCenters[2];
+  this.__defineGetter__("BottomLeft", function() {
+    return this.bottomLeft;
+  });
+  this.__defineGetter__("TopLeft", function() {
+    return this.topLeft;
+  });
+  this.__defineGetter__("TopRight", function() {
+    return this.topRight;
+  });
+}
+
+function FinderPatternFinder() {
+  this.image = null;
+  this.possibleCenters = [];
+  this.hasSkipped = false;
+  this.crossCheckStateCount = new Array(0, 0, 0, 0, 0);
+  this.resultPointCallback = null;
+  this.__defineGetter__("CrossCheckStateCount", function() {
+    this.crossCheckStateCount[0] = 0;
+    this.crossCheckStateCount[1] = 0;
+    this.crossCheckStateCount[2] = 0;
+    this.crossCheckStateCount[3] = 0;
+    this.crossCheckStateCount[4] = 0;
+    return this.crossCheckStateCount;
+  });
+  this.foundPatternCross = function(stateCount) {
+    let totalModuleSize = 0;
+    for (let i = 0; i < 5; i++) {
+      let count = stateCount[i];
+      if (count === 0) {
+        return false;
+      }
+      totalModuleSize += count;
+    }
+    if (totalModuleSize < 7) {
+      return false;
+    }
+    let moduleSize = Math.floor((totalModuleSize << INTEGER_MATH_SHIFT) / 7);
+    let maxVariance = Math.floor(moduleSize / 2);
+    return Math.abs(moduleSize - (stateCount[0] << INTEGER_MATH_SHIFT)) < maxVariance && Math.abs(moduleSize - (stateCount[1] << INTEGER_MATH_SHIFT)) < maxVariance && Math.abs(3 * moduleSize - (stateCount[2] << INTEGER_MATH_SHIFT)) < 3 * maxVariance && Math.abs(moduleSize - (stateCount[3] << INTEGER_MATH_SHIFT)) < maxVariance && Math.abs(moduleSize - (stateCount[4] << INTEGER_MATH_SHIFT)) < maxVariance;
+  };
+  this.centerFromEnd = function(stateCount, end) {
+    return end - stateCount[4] - stateCount[3] - stateCount[2] / 2;
+  };
+  this.crossCheckVertical = function(startI, centerJ, maxCount, originalStateCountTotal) {
+    let image = this.image;
+    let maxI = imgHeight;
+    let stateCount = this.CrossCheckStateCount;
+    let i = startI;
+    while (i >= 0 && image[centerJ + i * imgWidth]) {
+      stateCount[2]++;
+      i--;
+    }
+    if (i < 0) {
+      return NaN;
+    }
+    while (i >= 0 && !image[centerJ + i * imgWidth] && stateCount[1] <= maxCount) {
+      stateCount[1]++;
+      i--;
+    }
+    if (i < 0 || stateCount[1] > maxCount) {
+      return NaN;
+    }
+    while (i >= 0 && image[centerJ + i * imgWidth] && stateCount[0] <= maxCount) {
+      stateCount[0]++;
+      i--;
+    }
+    if (stateCount[0] > maxCount) {
+      return NaN;
+    }
+    i = startI + 1;
+    while (i < maxI && image[centerJ + i * imgWidth]) {
+      stateCount[2]++;
+      i++;
+    }
+    if (i == maxI) {
+      return NaN;
+    }
+    while (i < maxI && !image[centerJ + i * imgWidth] && stateCount[3] < maxCount) {
+      stateCount[3]++;
+      i++;
+    }
+    if (i == maxI || stateCount[3] >= maxCount) {
+      return NaN;
+    }
+    while (i < maxI && image[centerJ + i * imgWidth] && stateCount[4] < maxCount) {
+      stateCount[4]++;
+      i++;
+    }
+    if (stateCount[4] >= maxCount) {
+      return NaN;
+    }
+    let stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2] + stateCount[3] + stateCount[4];
+    if (5 * Math.abs(stateCountTotal - originalStateCountTotal) >= 2 * originalStateCountTotal) {
+      return NaN;
+    }
+    return this.foundPatternCross(stateCount) ? this.centerFromEnd(stateCount, i) : NaN;
+  };
+  this.crossCheckHorizontal = function(startJ, centerI, maxCount, originalStateCountTotal) {
+    let image = this.image;
+    let maxJ = imgWidth;
+    let stateCount = this.CrossCheckStateCount;
+    let j = startJ;
+    while (j >= 0 && image[j + centerI * imgWidth]) {
+      stateCount[2]++;
+      j--;
+    }
+    if (j < 0) {
+      return NaN;
+    }
+    while (j >= 0 && !image[j + centerI * imgWidth] && stateCount[1] <= maxCount) {
+      stateCount[1]++;
+      j--;
+    }
+    if (j < 0 || stateCount[1] > maxCount) {
+      return NaN;
+    }
+    while (j >= 0 && image[j + centerI * imgWidth] && stateCount[0] <= maxCount) {
+      stateCount[0]++;
+      j--;
+    }
+    if (stateCount[0] > maxCount) {
+      return NaN;
+    }
+    j = startJ + 1;
+    while (j < maxJ && image[j + centerI * imgWidth]) {
+      stateCount[2]++;
+      j++;
+    }
+    if (j == maxJ) {
+      return NaN;
+    }
+    while (j < maxJ && !image[j + centerI * imgWidth] && stateCount[3] < maxCount) {
+      stateCount[3]++;
+      j++;
+    }
+    if (j == maxJ || stateCount[3] >= maxCount) {
+      return NaN;
+    }
+    while (j < maxJ && image[j + centerI * imgWidth] && stateCount[4] < maxCount) {
+      stateCount[4]++;
+      j++;
+    }
+    if (stateCount[4] >= maxCount) {
+      return NaN;
+    }
+    let stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2] + stateCount[3] + stateCount[4];
+    if (5 * Math.abs(stateCountTotal - originalStateCountTotal) >= originalStateCountTotal) {
+      return NaN;
+    }
+    return this.foundPatternCross(stateCount) ? this.centerFromEnd(stateCount, j) : NaN;
+  };
+  this.handlePossibleCenter = function(stateCount, i, j) {
+    let stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2] + stateCount[3] + stateCount[4];
+    let centerJ = this.centerFromEnd(stateCount, j);
+    let centerI = this.crossCheckVertical(i, Math.floor(centerJ), stateCount[2], stateCountTotal);
+    if (!isNaN(centerI)) {
+      centerJ = this.crossCheckHorizontal(Math.floor(centerJ), Math.floor(centerI), stateCount[2], stateCountTotal);
+      if (!isNaN(centerJ)) {
+        let estimatedModuleSize = stateCountTotal / 7;
+        let found = false;
+        let max = this.possibleCenters.length;
+        for (let index = 0; index < max; index++) {
+          let center = this.possibleCenters[index];
+          if (center.aboutEquals(estimatedModuleSize, centerI, centerJ)) {
+            center.incrementCount();
+            found = true;
+            break;
+          }
+        }
+        if (!found) {
+          let point = new FinderPattern(centerJ, centerI, estimatedModuleSize);
+          this.possibleCenters.push(point);
+          if (this.resultPointCallback !== null) {
+            this.resultPointCallback.foundPossibleResultPoint(point);
+          }
+        }
+        return true;
+      }
+    }
+    return false;
+  };
+  this.selectBestPatterns = function() {
+    let startSize = this.possibleCenters.length;
+    if (startSize < 3) {
+      throw Error("Couldn't find enough finder patterns");
+    }
+    if (startSize > 3) {
+      let totalModuleSize = 0;
+      let square = 0;
+      for (let i = 0; i < startSize; i++) {
+        let centerValue = this.possibleCenters[i].EstimatedModuleSize;
+        totalModuleSize += centerValue;
+        square += centerValue * centerValue;
+      }
+      let average = totalModuleSize / startSize;
+      this.possibleCenters.sort(function(center1, center2) {
+        let dA = Math.abs(center2.EstimatedModuleSize - average);
+        let dB = Math.abs(center1.EstimatedModuleSize - average);
+        if (dA < dB) {
+          return -1;
+        } else if (dA == dB) {
+          return 0;
+        } else {
+          return 1;
+        }
+      });
+      let stdDev = Math.sqrt(square / startSize - average * average);
+      let limit = Math.max(0.2 * average, stdDev);
+      for (let i = 0; i < this.possibleCenters.length && this.possibleCenters.length > 3; i++) {
+        let pattern = this.possibleCenters[i];
+        if (Math.abs(pattern.EstimatedModuleSize - average) > limit) {
+          // mozilla: use splice instead
+          this.possibleCenters.splice(i, 1);
+          i--;
+        }
+      }
+    }
+    if (this.possibleCenters.length > 3) {
+      this.possibleCenters.sort(function(a, b) {
+        if (a.count > b.count) {
+          return -1;
+        }
+        if (a.count < b.count) {
+          return 1;
+        }
+        return 0;
+      });
+    }
+    return new Array(this.possibleCenters[0], this.possibleCenters[1], this.possibleCenters[2]);
+  };
+  this.findRowSkip = function() {
+    let max = this.possibleCenters.length;
+    if (max <= 1) {
+      return 0;
+    }
+    let firstConfirmedCenter = null;
+    for (let i = 0; i < max; i++) {
+      let center = this.possibleCenters[i];
+      if (center.Count >= CENTER_QUORUM) {
+        if (firstConfirmedCenter === null) {
+          firstConfirmedCenter = center;
+        } else {
+          this.hasSkipped = true;
+          return Math.floor((Math.abs(firstConfirmedCenter.X - center.X) - Math.abs(firstConfirmedCenter.Y - center.Y)) / 2);
+        }
+      }
+    }
+    return 0;
+  };
+  this.haveMultiplyConfirmedCenters = function() {
+    let confirmedCount = 0;
+    let totalModuleSize = 0;
+    let max = this.possibleCenters.length;
+    for (let i = 0; i < max; i++) {
+      let pattern = this.possibleCenters[i];
+      if (pattern.Count >= CENTER_QUORUM) {
+        confirmedCount++;
+        totalModuleSize += pattern.EstimatedModuleSize;
+      }
+    }
+    if (confirmedCount < 3) {
+      return false;
+    }
+    let average = totalModuleSize / max;
+    let totalDeviation = 0;
+    for (let i = 0; i < max; i++) {
+      let pattern = this.possibleCenters[i];
+      totalDeviation += Math.abs(pattern.EstimatedModuleSize - average);
+    }
+    return totalDeviation <= 0.05 * totalModuleSize;
+  };
+  this.findFinderPattern = function(image) {
+    let tryHarder = false;
+    this.image = image;
+    let maxI = imgHeight;
+    let maxJ = imgWidth;
+    let iSkip = Math.floor(3 * maxI / (4 * MAX_MODULES));
+    if (iSkip < MIN_SKIP || tryHarder) {
+      iSkip = MIN_SKIP;
+    }
+    let done = false;
+    let stateCount = new Array(5);
+    for (let i = iSkip - 1; i < maxI && !done; i += iSkip) {
+      stateCount[0] = 0;
+      stateCount[1] = 0;
+      stateCount[2] = 0;
+      stateCount[3] = 0;
+      stateCount[4] = 0;
+      let currentState = 0;
+      for (let j = 0; j < maxJ; j++) {
+        if (image[j + i * imgWidth]) {
+          if ((currentState & 1) == 1) {
+            currentState++;
+          }
+          stateCount[currentState]++;
+        } else {
+          if ((currentState & 1) === 0) {
+            if (currentState == 4) {
+              if (this.foundPatternCross(stateCount)) {
+                let confirmed = this.handlePossibleCenter(stateCount, i, j);
+                if (confirmed) {
+                  iSkip = 2;
+                  if (this.hasSkipped) {
+                    done = this.haveMultiplyConfirmedCenters();
+                  } else {
+                    let rowSkip = this.findRowSkip();
+                    if (rowSkip > stateCount[2]) {
+                      i += rowSkip - stateCount[2] - iSkip;
+                      j = maxJ - 1;
+                    }
+                  }
+                } else {
+                  do {
+                    j++;
+                  } while (j < maxJ && !image[j + i * imgWidth]);
+                  j--;
+                }
+                currentState = 0;
+                stateCount[0] = 0;
+                stateCount[1] = 0;
+                stateCount[2] = 0;
+                stateCount[3] = 0;
+                stateCount[4] = 0;
+              } else {
+                stateCount[0] = stateCount[2];
+                stateCount[1] = stateCount[3];
+                stateCount[2] = stateCount[4];
+                stateCount[3] = 1;
+                stateCount[4] = 0;
+                currentState = 3;
+              }
+            } else {
+              stateCount[++currentState]++;
+            }
+          } else {
+            stateCount[currentState]++;
+          }
+        }
+      }
+      if (this.foundPatternCross(stateCount)) {
+        let confirmed = this.handlePossibleCenter(stateCount, i, maxJ);
+        if (confirmed) {
+          iSkip = stateCount[0];
+          if (this.hasSkipped) {
+            done = this.haveMultiplyConfirmedCenters();
+          }
+        }
+      }
+    }
+    let patternInfo = this.selectBestPatterns();
+    qrcode.orderBestPatterns(patternInfo);
+    return new FinderPatternInfo(patternInfo);
+  };
+}
+
+function AlignmentPattern(posX, posY, estimatedModuleSize) {
+  this.x = posX;
+  this.y = posY;
+  this.count = 1;
+  this.estimatedModuleSize = estimatedModuleSize;
+  this.__defineGetter__("EstimatedModuleSize", function() {
+    return this.estimatedModuleSize;
+  });
+  this.__defineGetter__("Count", function() {
+    return this.count;
+  });
+  this.__defineGetter__("X", function() {
+    return Math.floor(this.x);
+  });
+  this.__defineGetter__("Y", function() {
+    return Math.floor(this.y);
+  });
+  this.incrementCount = function() {
+    this.count++;
+  };
+  this.aboutEquals = function(moduleSize, i, j) {
+    if (Math.abs(i - this.y) <= moduleSize && Math.abs(j - this.x) <= moduleSize) {
+      let moduleSizeDiff = Math.abs(moduleSize - this.estimatedModuleSize);
+      return moduleSizeDiff <= 1 || moduleSizeDiff / this.estimatedModuleSize <= 1;
+    }
+    return false;
+  };
+}
+
+function AlignmentPatternFinder(image, startX, startY, width, height, moduleSize, resultPointCallback) {
+  this.image = image;
+  this.possibleCenters = [];
+  this.startX = startX;
+  this.startY = startY;
+  this.width = width;
+  this.height = height;
+  this.moduleSize = moduleSize;
+  this.crossCheckStateCount = new Array(0, 0, 0);
+  this.resultPointCallback = resultPointCallback;
+  this.centerFromEnd = function(stateCount, end) {
+    return end - stateCount[2] - stateCount[1] / 2;
+  };
+  this.foundPatternCross = function(stateCount) {
+    let moduleSize = this.moduleSize;
+    let maxVariance = moduleSize / 2;
+    for (let i = 0; i < 3; i++) {
+      if (Math.abs(moduleSize - stateCount[i]) >= maxVariance) {
+        return false;
+      }
+    }
+    return true;
+  };
+  this.crossCheckVertical = function(startI, centerJ, maxCount, originalStateCountTotal) {
+    let image = this.image;
+    let maxI = imgHeight;
+    let stateCount = this.crossCheckStateCount;
+    stateCount[0] = 0;
+    stateCount[1] = 0;
+    stateCount[2] = 0;
+    let i = startI;
+    while (i >= 0 && image[centerJ + i * imgWidth] && stateCount[1] <= maxCount) {
+      stateCount[1]++;
+      i--;
+    }
+    if (i < 0 || stateCount[1] > maxCount) {
+      return NaN;
+    }
+    while (i >= 0 && !image[centerJ + i * imgWidth] && stateCount[0] <= maxCount) {
+      stateCount[0]++;
+      i--;
+    }
+    if (stateCount[0] > maxCount) {
+      return NaN;
+    }
+    i = startI + 1;
+    while (i < maxI && image[centerJ + i * imgWidth] && stateCount[1] <= maxCount) {
+      stateCount[1]++;
+      i++;
+    }
+    if (i == maxI || stateCount[1] > maxCount) {
+      return NaN;
+    }
+    while (i < maxI && !image[centerJ + i * imgWidth] && stateCount[2] <= maxCount) {
+      stateCount[2]++;
+      i++;
+    }
+    if (stateCount[2] > maxCount) {
+      return NaN;
+    }
+    let stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2];
+    if (5 * Math.abs(stateCountTotal - originalStateCountTotal) >= 2 * originalStateCountTotal) {
+      return NaN;
+    }
+    return this.foundPatternCross(stateCount) ? this.centerFromEnd(stateCount, i) : NaN;
+  };
+  this.handlePossibleCenter = function(stateCount, i, j) {
+    let stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2];
+    let centerJ = this.centerFromEnd(stateCount, j);
+    let centerI = this.crossCheckVertical(i, Math.floor(centerJ), 2 * stateCount[1], stateCountTotal);
+    if (!isNaN(centerI)) {
+      let estimatedModuleSize = (stateCount[0] + stateCount[1] + stateCount[2]) / 3;
+      let max = this.possibleCenters.length;
+      for (let index = 0; index < max; index++) {
+        let center = this.possibleCenters[index];
+        if (center.aboutEquals(estimatedModuleSize, centerI, centerJ)) {
+          return new AlignmentPattern(centerJ, centerI, estimatedModuleSize);
+        }
+      }
+      let point = new AlignmentPattern(centerJ, centerI, estimatedModuleSize);
+      this.possibleCenters.push(point);
+      if (this.resultPointCallback !== null) {
+        this.resultPointCallback.foundPossibleResultPoint(point);
+      }
+    }
+    return null;
+  };
+  this.find = function() {
+    let startX = this.startX;
+    let height = this.height;
+    let maxJ = startX + width;
+    let middleI = startY + (height >> 1);
+    let stateCount = new Array(0, 0, 0);
+    for (let iGen = 0; iGen < height; iGen++) {
+      let i = middleI + ((iGen & 1) === 0 ? iGen + 1 >> 1 : -(iGen + 1 >> 1));
+      stateCount[0] = 0;
+      stateCount[1] = 0;
+      stateCount[2] = 0;
+      let j = startX;
+      while (j < maxJ && !image[j + imgWidth * i]) {
+        j++;
+      }
+      let currentState = 0;
+      while (j < maxJ) {
+        if (image[j + i * imgWidth]) {
+          if (currentState == 1) {
+            stateCount[currentState]++;
+          } else {
+            if (currentState == 2) {
+              if (this.foundPatternCross(stateCount)) {
+                let confirmed = this.handlePossibleCenter(stateCount, i, j);
+                if (confirmed !== null) {
+                  return confirmed;
+                }
+              }
+              stateCount[0] = stateCount[2];
+              stateCount[1] = 1;
+              stateCount[2] = 0;
+              currentState = 1;
+            } else {
+              stateCount[++currentState]++;
+            }
+          }
+        } else {
+          if (currentState == 1) {
+            currentState++;
+          }
+          stateCount[currentState]++;
+        }
+        j++;
+      }
+      if (this.foundPatternCross(stateCount)) {
+        let confirmed = this.handlePossibleCenter(stateCount, i, maxJ);
+        if (confirmed !== null) {
+          return confirmed;
+        }
+      }
+    }
+    if (this.possibleCenters.length !== 0) {
+      return this.possibleCenters[0];
+    }
+    throw "Couldn't find enough alignment patterns";
+  };
+}
+
+function QRCodeDataBlockReader(blocks, version, numErrorCorrectionCode) {
+  this.blockPointer = 0;
+  this.bitPointer = 7;
+  this.dataLength = 0;
+  this.blocks = blocks;
+  this.numErrorCorrectionCode = numErrorCorrectionCode;
+  if (version <= 9) this.dataLengthMode = 0; else if (version >= 10 && version <= 26) this.dataLengthMode = 1; else if (version >= 27 && version <= 40) this.dataLengthMode = 2;
+  this.getNextBits = function(numBits) {
+    let bits = 0;
+    if (numBits < this.bitPointer + 1) {
+      let mask = 0;
+      for (let i = 0; i < numBits; i++) {
+        mask += 1 << i;
+      }
+      mask <<= this.bitPointer - numBits + 1;
+      bits = (this.blocks[this.blockPointer] & mask) >> this.bitPointer - numBits + 1;
+      this.bitPointer -= numBits;
+      return bits;
+    } else if (numBits < this.bitPointer + 1 + 8) {
+      let mask1 = 0;
+      for (let i = 0; i < this.bitPointer + 1; i++) {
+        mask1 += 1 << i;
+      }
+      bits = (this.blocks[this.blockPointer] & mask1) << numBits - (this.bitPointer + 1);
+      this.blockPointer++;
+      bits += this.blocks[this.blockPointer] >> 8 - (numBits - (this.bitPointer + 1));
+      this.bitPointer = this.bitPointer - numBits % 8;
+      if (this.bitPointer < 0) {
+        this.bitPointer = 8 + this.bitPointer;
+      }
+      return bits;
+    } else if (numBits < this.bitPointer + 1 + 16) {
+      let mask1 = 0;
+      let mask3 = 0;
+      for (let i = 0; i < this.bitPointer + 1; i++) {
+        mask1 += 1 << i;
+      }
+      let bitsFirstBlock = (this.blocks[this.blockPointer] & mask1) << numBits - (this.bitPointer + 1);
+      this.blockPointer++;
+      let bitsSecondBlock = this.blocks[this.blockPointer] << numBits - (this.bitPointer + 1 + 8);
+      this.blockPointer++;
+      for (let i = 0; i < numBits - (this.bitPointer + 1 + 8); i++) {
+        mask3 += 1 << i;
+      }
+      mask3 <<= 8 - (numBits - (this.bitPointer + 1 + 8));
+      let bitsThirdBlock = (this.blocks[this.blockPointer] & mask3) >> 8 - (numBits - (this.bitPointer + 1 + 8));
+      bits = bitsFirstBlock + bitsSecondBlock + bitsThirdBlock;
+      this.bitPointer = this.bitPointer - (numBits - 8) % 8;
+      if (this.bitPointer < 0) {
+        this.bitPointer = 8 + this.bitPointer;
+      }
+      return bits;
+    } else {
+      return 0;
+    }
+  };
+  this.NextMode = function() {
+    if (this.blockPointer > this.blocks.length - this.numErrorCorrectionCode - 2) return 0; else return this.getNextBits(4);
+  };
+  this.getDataLength = function(modeIndicator) {
+    let index = 0;
+    while (true) {
+      if (modeIndicator >> index == 1) break;
+      index++;
+    }
+    return this.getNextBits(sizeOfDataLengthInfo[this.dataLengthMode][index]);
+  };
+  this.getRomanAndFigureString = function(dataLength) {
+    var length = dataLength;
+    let intData = 0;
+    let strData = "";
+    let tableRomanAndFigure = new Array("0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "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", " ", "$", "%", "*", "+", "-", ".", "/", ":");
+    do {
+      if (length > 1) {
+        intData = this.getNextBits(11);
+        let firstLetter = Math.floor(intData / 45);
+        let secondLetter = intData % 45;
+        strData += tableRomanAndFigure[firstLetter];
+        strData += tableRomanAndFigure[secondLetter];
+        length -= 2;
+      } else if (length == 1) {
+        intData = this.getNextBits(6);
+        strData += tableRomanAndFigure[intData];
+        length -= 1;
+      }
+    } while (length > 0);
+    return strData;
+  };
+  this.getFigureString = function(dataLength) {
+    var length = dataLength;
+    let intData = 0;
+    let strData = "";
+    do {
+      if (length >= 3) {
+        intData = this.getNextBits(10);
+        if (intData < 100) strData += "0";
+        if (intData < 10) strData += "0";
+        length -= 3;
+      } else if (length == 2) {
+        intData = this.getNextBits(7);
+        if (intData < 10) strData += "0";
+        length -= 2;
+      } else if (length == 1) {
+        intData = this.getNextBits(4);
+        length -= 1;
+      }
+      strData += intData;
+    } while (length > 0);
+    return strData;
+  };
+  this.get8bitByteArray = function(dataLength) {
+    var length = dataLength;
+    let intData = 0;
+    let output = [];
+    do {
+      intData = this.getNextBits(8);
+      output.push(intData);
+      length--;
+    } while (length > 0);
+    return output;
+  };
+  this.getKanjiString = function(dataLength) {
+    var length = dataLength;
+    let intData = 0;
+    let unicodeString = "";
+    do {
+      intData = this.getNextBits(13);
+      let lowerByte = intData % 192;
+      let higherByte = intData / 192;
+      let tempWord = (higherByte << 8) + lowerByte;
+      let shiftjisWord = 0;
+      if (tempWord + 33088 <= 40956) {
+        shiftjisWord = tempWord + 33088;
+      } else {
+        shiftjisWord = tempWord + 49472;
+      }
+      unicodeString += String.fromCharCode(shiftjisWord);
+      length--;
+    } while (length > 0);
+    return unicodeString;
+  };
+  this.__defineGetter__("DataByte", function() {
+    let output = [];
+    let MODE_NUMBER = 1;
+    let MODE_ROMAN_AND_NUMBER = 2;
+    let MODE_8BIT_BYTE = 4;
+    let MODE_KANJI = 8;
+    do {
+      let mode = this.NextMode();
+      if (mode === 0) {
+        if (output.length > 0) break; else throw "Empty data block";
+      }
+      if (mode != MODE_NUMBER && mode != MODE_ROMAN_AND_NUMBER && mode != MODE_8BIT_BYTE && mode != MODE_KANJI) {
+        throw "Invalid mode: " + mode + " in (block:" + this.blockPointer + " bit:" + this.bitPointer + ")";
+      }
+      let dataLength = this.getDataLength(mode);
+      if (dataLength < 1) {
+        throw "Invalid data length: " + dataLength;
+      }
+      let temp_str;
+      let ta;
+      switch (mode) {
+       case MODE_NUMBER:
+        temp_str = this.getFigureString(dataLength);
+        ta = new Array(temp_str.length);
+        for (let j = 0; j < temp_str.length; j++) ta[j] = temp_str.charCodeAt(j);
+        output.push(ta);
+        break;
+
+       case MODE_ROMAN_AND_NUMBER:
+        temp_str = this.getRomanAndFigureString(dataLength);
+        ta = new Array(temp_str.length);
+        for (let j = 0; j < temp_str.length; j++) ta[j] = temp_str.charCodeAt(j);
+        output.push(ta);
+        break;
+
+       case MODE_8BIT_BYTE:
+        let temp_sbyteArray3 = this.get8bitByteArray(dataLength);
+        output.push(temp_sbyteArray3);
+        break;
+
+       case MODE_KANJI:
+        temp_str = this.getKanjiString(dataLength);
+        output.push(temp_str);
+        break;
+      }
+    } while (true);
+    return output;
+  });
+}