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jsqrcode.js
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/*
* Created by Ion Drive Software Ltd from sources at
* http://github.com/LazarSoft/jsqrcode
*/
/*
* Copyright 2014 Ion Drive Software Ltd
*
* Copyright 2011 Lazar Laszlo
*
* 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.
*/
(function (window) {
'use strict';
var GridSampler = {};
GridSampler.checkAndNudgePoints = function(image, points) {
var width = qrcode.width;
var height = qrcode.height;
var offset, x, y;
// Check and nudge points from start until we see some that are OK:
var nudged = true;
for (offset = 0; offset < points.length && nudged; offset += 2) {
x = Math.floor(points[offset]);
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] = 0.0;
nudged = true;
} else if (x === width) {
points[offset] = width - 1;
nudged = true;
}
if (y === -1) {
points[offset + 1] = 0.0;
nudged = true;
} else if (y === height) {
points[offset + 1] = height - 1;
nudged = true;
}
}
// Check and nudge points from end:
nudged = true;
for (offset = points.length - 2; offset >= 0 && nudged; offset -= 2) {
x = Math.floor(points[offset]);
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] = 0.0;
nudged = true;
} else if (x === width) {
points[offset] = width - 1;
nudged = true;
}
if (y === -1) {
points[offset + 1] = 0.0;
nudged = true;
} else if (y === height) {
points[offset + 1] = height - 1;
nudged = true;
}
}
};
GridSampler.sampleGrid3 = function(image, dimension, transform) {
var bits = new BitMatrix(dimension);
var points = new Array(dimension << 1);
var x;
for (var y = 0; y < dimension; y++) {
var max = points.length;
var iValue = y + 0.5;
for (x = 0; x < max; x += 2) {
points[x] = (x >> 1) + 0.5;
points[x + 1] = iValue;
}
transform.transformPoints1(points);
// Quick check to see if points transformed to something inside the image;
// sufficient to check the endpoints
GridSampler.checkAndNudgePoints(image, points);
try {
for (x = 0; x < max; x += 2) {
var xpoint = (Math.floor(points[x]) * 4) + (Math.floor(points[x + 1]) * qrcode.width * 4);
var bit = image[Math.floor(points[x]) + qrcode.width * Math.floor(points[x + 1])];
qrcode.imagedata.data[xpoint] = bit ? 255 : 0;
qrcode.imagedata.data[xpoint + 1] = bit ? 255 : 0;
qrcode.imagedata.data[xpoint + 2] = 0;
qrcode.imagedata.data[xpoint + 3] = 255;
//bits[x >> 1][ y]=bit;
if (bit) {
bits.setRenamed(x >> 1, y);
}
}
} catch (e) {
// This feels wrong, but, sometimes if the finder patterns are misidentified, the resulting
// transform gets 'twisted' such that it maps a straight line of points to a set of points
// whose endpoints are in bounds, but others are not. There is probably some mathematical
// way to detect this about the transformation that I don't know yet.
// This results in an ugly runtime exception despite our clever checks above -- can't have
// that. We could check each point's coordinates but that feels duplicative. We settle for
// catching and wrapping ArrayIndexOutOfBoundsException.
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) {
var 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() {
var total = 0;
for (var 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);
var total = 0;
var ecCodewords = ecBlocks1.ECCodewordsPerBlock;
var ecbArray = ecBlocks1.getECBlocks();
for (var i = 0; i < ecbArray.length; i++) {
var 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() {
var dimension = this.DimensionForVersion;
var bitMatrix = new BitMatrix(dimension);
// Top left finder pattern + separator + format
bitMatrix.setRegion(0, 0, 9, 9);
// Top right finder pattern + separator + format
bitMatrix.setRegion(dimension - 8, 0, 8, 9);
// Bottom left finder pattern + separator + format
bitMatrix.setRegion(0, dimension - 8, 9, 8);
// Alignment patterns
var max = this.alignmentPatternCenters.length;
for (var x = 0; x < max; x++) {
var i = this.alignmentPatternCenters[x] - 2;
for (var y = 0; y < max; y++) {
if ((x === 0 && (y === 0 || y === max - 1)) || (x === max - 1 && y === 0)) {
// No alignment patterns near the three finder paterns
continue;
}
bitMatrix.setRegion(this.alignmentPatternCenters[y] - 2, i, 5, 5);
}
}
// Vertical timing pattern
bitMatrix.setRegion(6, 9, 1, dimension - 17);
// Horizontal timing pattern
bitMatrix.setRegion(9, 6, dimension - 17, 1);
if (this.versionNumber > 6) {
// Version info, top right
bitMatrix.setRegion(dimension - 11, 0, 3, 6);
// Version info, bottom left
bitMatrix.setRegion(0, dimension - 11, 6, 3);
}
return bitMatrix;
};
this.getECBlocksForLevel = function(ecLevel) {
return this.ecBlocks[ecLevel.ordinal()];
};
}
Version.VERSION_DECODE_INFO = new Array(0x07C94, 0x085BC, 0x09A99, 0x0A4D3, 0x0BBF6, 0x0C762, 0x0D847, 0x0E60D, 0x0F928, 0x10B78, 0x1145D, 0x12A17, 0x13532, 0x149A6, 0x15683, 0x168C9, 0x177EC, 0x18EC4, 0x191E1, 0x1AFAB, 0x1B08E, 0x1CC1A, 0x1D33F, 0x1ED75, 0x1F250, 0x209D5, 0x216F0, 0x228BA, 0x2379F, 0x24B0B, 0x2542E, 0x26A64, 0x27541, 0x28C69);
Version.VERSIONS = [
new Version(1, [], 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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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, [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)))
];
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 (e) {
throw 'Error getVersionForNumber';
}
};
Version.decodeVersionInformation = function(versionBits) {
var bestDifference = 0xffffffff;
var bestVersion = 0;
for (var i = 0; i < Version.VERSION_DECODE_INFO.length; i++) {
var targetVersion = Version.VERSION_DECODE_INFO[i];
// Do the version info bits match exactly? done.
if (targetVersion === versionBits) {
return this.getVersionForNumber(i + 7);
}
// Otherwise see if this is the closest to a real version info bit string
// we have seen so far
var bitsDifference = FormatInformation.numBitsDiffering(versionBits, targetVersion);
if (bitsDifference < bestDifference) {
bestVersion = i + 7;
bestDifference = bitsDifference;
}
}
// We can tolerate up to 3 bits of error since no two version info codewords will
// differ in less than 4 bits.
if (bestDifference <= 3) {
return this.getVersionForNumber(bestVersion);
}
// If we didn't find a close enough match, fail
return null;
};
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) {
var max = points.length;
var a11 = this.a11;
var a12 = this.a12;
var a13 = this.a13;
var a21 = this.a21;
var a22 = this.a22;
var a23 = this.a23;
var a31 = this.a31;
var a32 = this.a32;
var a33 = this.a33;
for (var i = 0; i < max; i += 2) {
var x = points[i];
var y = points[i + 1];
var 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) {
var n = xValues.length;
for (var i = 0; i < n; i++) {
var x = xValues[i];
var y = yValues[i];
var 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() {
// Adjoint is the transpose of the cofactor matrix:
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) {
var qToS = this.quadrilateralToSquare(x0, y0, x1, y1, x2, y2, x3, y3);
var 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) {
var dx1, dx2, dx3, dy1, a13, a23;
var dy2 = y3 - y2;
var dy3 = y0 - y1 + y2 - y3;
var denominator;
if (dy2 === 0.0 && dy3 === 0.0) {
return new PerspectiveTransform(x1 - x0, x2 - x1, x0, y1 - y0, y2 - y1, y0, 0.0, 0.0, 1.0);
} else {
dx1 = x1 - x2;
dx2 = x3 - x2;
dx3 = x0 - x1 + x2 - x3;
dy1 = y1 - y2;
denominator = dx1 * dy2 - dx2 * dy1;
a13 = (dx3 * dy2 - dx2 * dy3) / denominator;
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, 1.0);
}
};
PerspectiveTransform.quadrilateralToSquare = function(x0, y0, x1, y1, x2, y2, x3, y3) {
// Here, the adjoint serves as the inverse:
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) {
// Mild variant of Bresenham's algorithm;
// see http://en.wikipedia.org/wiki/Bresenham's_line_algorithm
var steep = Math.abs(toY - fromY) > Math.abs(toX - fromX);
if (steep) {
var temp = fromX;
fromX = fromY;
fromY = temp;
temp = toX;
toX = toY;
toY = temp;
}
var dx = Math.abs(toX - fromX);
var dy = Math.abs(toY - fromY);
var error = -dx >> 1;
var ystep = fromY < toY ? 1 : -1;
var xstep = fromX < toX ? 1 : -1;
var state = 0; // In black pixels, looking for white, first or second time
for (var x = fromX, y = fromY; x !== toX; x += xstep) {
var realX = steep ? y : x;
var realY = steep ? x : y;
if (state === 1) {
// In white pixels, looking for black
if (this.image[realX + (realY * qrcode.width)]) {
state++;
}
} else {
if (!this.image[realX + (realY * qrcode.width)]) {
state++;
}
}
if (state === 3) {
// Found black, white, black, and stumbled back onto white; done
var diffX = x - fromX;
var diffY = y - fromY;
return Math.sqrt((diffX * diffX + diffY * diffY));
}
error += dy;
if (error > 0) {
if (y === toY) {
break;
}
y += ystep;
error -= dx;
}
}
var diffX2 = toX - fromX;
var diffY2 = toY - fromY;
return Math.sqrt((diffX2 * diffX2) + (diffY2 * diffY2));
};
this.sizeOfBlackWhiteBlackRunBothWays = function(fromX, fromY, toX, toY) {
var result = this.sizeOfBlackWhiteBlackRun(fromX, fromY, toX, toY);
// Now count other way -- don't run off image though of course
var scale = 1.0;
var otherToX = fromX - (toX - fromX);
if (otherToX < 0) {
scale = fromX / (fromX - otherToX);
otherToX = 0;
} else if (otherToX >= qrcode.width) {
scale = (qrcode.width - 1 - fromX) / (otherToX - fromX);
otherToX = qrcode.width - 1;
}
var otherToY = Math.floor(fromY - (toY - fromY) * scale);
scale = 1.0;
if (otherToY < 0) {
scale = fromY / (fromY - otherToY);
otherToY = 0;
} else if (otherToY >= qrcode.height) {
scale = (qrcode.height - 1 - fromY) / (otherToY - fromY);
otherToY = qrcode.height - 1;
}
otherToX = Math.floor(fromX + (otherToX - fromX) * scale);
result += this.sizeOfBlackWhiteBlackRun(fromX, fromY, otherToX, otherToY);
return result - 1.0; // -1 because we counted the middle pixel twice
};
this.calculateModuleSizeOneWay = function(pattern, otherPattern) {
var moduleSizeEst1 = this.sizeOfBlackWhiteBlackRunBothWays(Math.floor(pattern.X), Math.floor(pattern.Y), Math.floor(otherPattern.X), Math.floor(otherPattern.Y));
var moduleSizeEst2 = this.sizeOfBlackWhiteBlackRunBothWays(Math.floor(otherPattern.X), Math.floor(otherPattern.Y), Math.floor(pattern.X), Math.floor(pattern.Y));
if (isNaN(moduleSizeEst1)) {
return moduleSizeEst2 / 7.0;
}
if (isNaN(moduleSizeEst2)) {
return moduleSizeEst1 / 7.0;
}
// Average them, and divide by 7 since we've counted the width of 3 black modules,
// and 1 white and 1 black module on either side. Ergo, divide sum by 14.
return (moduleSizeEst1 + moduleSizeEst2) / 14.0;
};
this.calculateModuleSize = function(topLeft, topRight, bottomLeft) {
// Take the average
return (this.calculateModuleSizeOneWay(topLeft, topRight) + this.calculateModuleSizeOneWay(topLeft, bottomLeft)) / 2;
};
this.distance = function(pattern1, pattern2) {
var xDiff = pattern1.X - pattern2.X;
var yDiff = pattern1.Y - pattern2.Y;
return Math.sqrt((xDiff * xDiff) + (yDiff * yDiff));
};
this.computeDimension = function(topLeft, topRight, bottomLeft, moduleSize) {
var tltrCentersDimension = Math.round(this.distance(topLeft, topRight) / moduleSize);
var tlblCentersDimension = Math.round(this.distance(topLeft, bottomLeft) / moduleSize);
var dimension = ((tltrCentersDimension + tlblCentersDimension) >> 1) + 7;
switch (dimension & 0x03) {
// mod 4
case 0:
dimension++;
break;
// 1? do nothing
case 2:
dimension--;
break;
case 3:
throw 'Error';
}
return dimension;
};
this.findAlignmentInRegion = function(overallEstModuleSize, estAlignmentX, estAlignmentY, allowanceFactor) {
// Look for an alignment pattern (3 modules in size) around where it
// should be
var allowance = Math.floor(allowanceFactor * overallEstModuleSize);
var alignmentAreaLeftX = Math.max(0, estAlignmentX - allowance);
var alignmentAreaRightX = Math.min(qrcode.width - 1, estAlignmentX + allowance);
if (alignmentAreaRightX - alignmentAreaLeftX < overallEstModuleSize * 3) {
throw 'Error';
}
var alignmentAreaTopY = Math.max(0, estAlignmentY - allowance);
var alignmentAreaBottomY = Math.min(qrcode.height - 1, estAlignmentY + allowance);
var 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) {
var dimMinusThree = dimension - 3.5;
var bottomRightX;
var bottomRightY;
var sourceBottomRightX;
var sourceBottomRightY;
if (alignmentPattern !== null) {
bottomRightX = alignmentPattern.X;
bottomRightY = alignmentPattern.Y;
sourceBottomRightX = sourceBottomRightY = dimMinusThree - 3.0;
} else {
// Don't have an alignment pattern, just make up the bottom-right point
bottomRightX = (topRight.X - topLeft.X) + bottomLeft.X;
bottomRightY = (topRight.Y - topLeft.Y) + bottomLeft.Y;
sourceBottomRightX = sourceBottomRightY = dimMinusThree;
}
var 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) {
var sampler = GridSampler;
return sampler.sampleGrid3(image, dimension, transform);
};
this.processFinderPatternInfo = function(info) {
var topLeft = info.TopLeft;
var topRight = info.TopRight;
var bottomLeft = info.BottomLeft;
var moduleSize = this.calculateModuleSize(topLeft, topRight, bottomLeft);
if (moduleSize < 1) {
throw 'Error';
}
var dimension = this.computeDimension(topLeft, topRight, bottomLeft, moduleSize);
var provisionalVersion = Version.getProvisionalVersionForDimension(dimension);
var modulesBetweenFPCenters = provisionalVersion.DimensionForVersion - 7;
var alignmentPattern = null;
// Anything above version 1 has an alignment pattern
if (provisionalVersion.AlignmentPatternCenters.length > 0) {
// Guess where a 'bottom right' finder pattern would have been
var bottomRightX = topRight.X - topLeft.X + bottomLeft.X;
var bottomRightY = topRight.Y - topLeft.Y + bottomLeft.Y;
// Estimate that alignment pattern is closer by 3 modules
// from 'bottom right' to known top left location
var correctionToTopLeft = 1.0 - 3.0 / modulesBetweenFPCenters;
var estAlignmentX = Math.floor(topLeft.X + correctionToTopLeft * (bottomRightX - topLeft.X));
var estAlignmentY = Math.floor(topLeft.Y + correctionToTopLeft * (bottomRightY - topLeft.Y));
// Kind of arbitrary -- expand search radius before giving up
for (var i = 4; i <= 16; i <<= 1) {
//try
//{
alignmentPattern = this.findAlignmentInRegion(moduleSize, estAlignmentX, estAlignmentY, i);
break;
//}
//catch (re)
//{
// try next round
//}
}
// If we didn't find alignment pattern... well try anyway without it
}
var transform = this.createTransform(topLeft, topRight, bottomLeft, alignmentPattern, dimension);
var bits = this.sampleGrid(this.image, transform, dimension);
var 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() {
var info = new FinderPatternFinder().findFinderPattern(this.image);
return this.processFinderPatternInfo(info);
};
}
var FORMAT_INFO_MASK_QR = 0x5412;
var FORMAT_INFO_DECODE_LOOKUP = new Array(new Array(0x5412, 0x00), new Array(0x5125, 0x01), new Array(0x5E7C, 0x02), new Array(0x5B4B, 0x03), new Array(0x45F9, 0x04), new Array(0x40CE, 0x05), new Array(0x4F97, 0x06), new Array(0x4AA0, 0x07), new Array(0x77C4, 0x08), new Array(0x72F3, 0x09), new Array(0x7DAA, 0x0A), new Array(0x789D, 0x0B), new Array(0x662F, 0x0C), new Array(0x6318, 0x0D), new Array(0x6C41, 0x0E), new Array(0x6976, 0x0F), new Array(0x1689, 0x10), new Array(0x13BE, 0x11), new Array(0x1CE7, 0x12), new Array(0x19D0, 0x13), new Array(0x0762, 0x14), new Array(0x0255, 0x15), new Array(0x0D0C, 0x16), new Array(0x083B, 0x17), new Array(0x355F, 0x18), new Array(0x3068, 0x19), new Array(0x3F31, 0x1A), new Array(0x3A06, 0x1B), new Array(0x24B4, 0x1C), new Array(0x2183, 0x1D), new Array(0x2EDA, 0x1E), new Array(0x2BED, 0x1F));
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) & 0x03);
this.dataMask = (formatInfo & 0x07);
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) {
var other = o;
return this.errorCorrectionLevel === other.errorCorrectionLevel && this.dataMask === other.dataMask;
};
}
FormatInformation.numBitsDiffering = function(a, b) {
a ^= b; // a now has a 1 bit exactly where its bit differs with b's
// Count bits set quickly with a series of lookups:
return BITS_SET_IN_HALF_BYTE[a & 0x0F] + BITS_SET_IN_HALF_BYTE[(urShift(a, 4) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(urShift(a, 8) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(urShift(a, 12) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(urShift(a, 16) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(urShift(a, 20) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(urShift(a, 24) & 0x0F)] + BITS_SET_IN_HALF_BYTE[(urShift(a, 28) & 0x0F)];
};
FormatInformation.decodeFormatInformation = function(maskedFormatInfo) {
var formatInfo = FormatInformation.doDecodeFormatInformation(maskedFormatInfo);
if (formatInfo !== null) {
return formatInfo;
}
// Should return null, but, some QR codes apparently
// do not mask this info. Try again by actually masking the pattern
// first
return FormatInformation.doDecodeFormatInformation(maskedFormatInfo ^ FORMAT_INFO_MASK_QR);
};
FormatInformation.doDecodeFormatInformation = function(maskedFormatInfo) {
// Find the int in FORMAT_INFO_DECODE_LOOKUP with fewest bits differing
var bestDifference = 0xffffffff;
var bestFormatInfo = 0;
for (var i = 0; i < FORMAT_INFO_DECODE_LOOKUP.length; i++) {
var decodeInfo = FORMAT_INFO_DECODE_LOOKUP[i];
var targetInfo = decodeInfo[0];
if (targetInfo === maskedFormatInfo) {
// Found an exact match
return new FormatInformation(decodeInfo[1]);
}
var bitsDifference = this.numBitsDiffering(maskedFormatInfo, targetInfo);
if (bitsDifference < bestDifference) {
bestFormatInfo = decodeInfo[1];
bestDifference = bitsDifference;
}
}
// Hamming distance of the 32 masked codes is 7, by construction, so <= 3 bits
// differing means we found a match
if (bestDifference <= 3) {
return new FormatInformation(bestFormatInfo);
}
return null;
};
function ErrorCorrectionLevel(ordinal, bits, name) {
this.ordinalRenamedField = 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.ordinalRenamedField;
};
}
ErrorCorrectionLevel.forBits = function(bits) {
if (bits < 0 || bits >= FOR_BITS.length) {
throw 'ArgumentException';
}
return FOR_BITS[bits];
};
var L = new ErrorCorrectionLevel(0, 0x01, 'L');
var M = new ErrorCorrectionLevel(1, 0x00, 'M');
var Q = new ErrorCorrectionLevel(2, 0x03, 'Q');
var H = new ErrorCorrectionLevel(3, 0x02, 'H');
var FOR_BITS = new Array(M, L, H, Q);
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;
var rowSize = width >> 5;
if ((width & 0x1f) !== 0) {
rowSize++;
}
this.rowSize = rowSize;
this.bits = new Array(rowSize * height);
for (var 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.getRenamed = function(x, y) {
var offset = y * this.rowSize + (x >> 5);
return ((urShift(this.bits[offset], (x & 0x1f))) & 1) !== 0;
};
this.setRenamed = function(x, y) {
var offset = y * this.rowSize + (x >> 5);
this.bits[offset] |= 1 << (x & 0x1f);
};
this.flip = function(x, y) {
var offset = y * this.rowSize + (x >> 5);
this.bits[offset] ^= 1 << (x & 0x1f);
};
this.clear = function() {
var max = this.bits.length;
for (var 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';
}
var right = left + width;
var bottom = top + height;
if (bottom > this.height || right > this.width) {
throw 'The region must fit inside the matrix';
}
for (var y = top; y < bottom; y++) {
var offset = y * this.rowSize;
for (var x = left; x < right; x++) {
this.bits[offset + (x >> 5)] |= 1 << (x & 0x1f);
}
}
};
}
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';
}
// Figure out the number and size of data blocks used by this version and
// error correction level
var ecBlocks = version.getECBlocksForLevel(ecLevel);
// First count the total number of data blocks
var totalBlocks = 0;
var ecBlockArray = ecBlocks.getECBlocks();
var i, j;
for (i = 0; i < ecBlockArray.length; i++) {
totalBlocks += ecBlockArray[i].Count;
}
// Now establish DataBlocks of the appropriate size and number of data codewords
var result = new Array(totalBlocks);
var numResultBlocks = 0;
for (j = 0; j < ecBlockArray.length; j++) {
var ecBlock = ecBlockArray[j];
for (i = 0; i < ecBlock.Count; i++) {
var numDataCodewords = ecBlock.DataCodewords;
var numBlockCodewords = ecBlocks.ECCodewordsPerBlock + numDataCodewords;
result[numResultBlocks++] = new DataBlock(numDataCodewords, new Array(numBlockCodewords));
}
}
// All blocks have the same amount of data, except that the last n
// (where n may be 0) have 1 more byte. Figure out where these start.
var shorterBlocksTotalCodewords = result[0].codewords.length;
var longerBlocksStartAt = result.length - 1;
while (longerBlocksStartAt >= 0) {
var numCodewords = result[longerBlocksStartAt].codewords.length;
if (numCodewords === shorterBlocksTotalCodewords) {
break;
}
longerBlocksStartAt--;
}
longerBlocksStartAt++;
var shorterBlocksNumDataCodewords = shorterBlocksTotalCodewords - ecBlocks.ECCodewordsPerBlock;
// The last elements of result may be 1 element longer;
// first fill out as many elements as all of them have
var rawCodewordsOffset = 0;
for (i = 0; i < shorterBlocksNumDataCodewords; i++) {
for (j = 0; j < numResultBlocks; j++) {
result[j].codewords[i] = rawCodewords[rawCodewordsOffset++];
}
}
// Fill out the last data block in the longer ones
for (j = longerBlocksStartAt; j < numResultBlocks; j++) {
result[j].codewords[shorterBlocksNumDataCodewords] = rawCodewords[rawCodewordsOffset++];
}
// Now add in error correction blocks
var max = result[0].codewords.length;
for (i = shorterBlocksNumDataCodewords; i < max; i++) {
for (j = 0; j < numResultBlocks; j++) {
var iOffset = j < longerBlocksStartAt ? i : i + 1;
result[j].codewords[iOffset] = rawCodewords[rawCodewordsOffset++];
}
}
return result;
};
function BitMatrixParser(bitMatrix) {
var dimension = bitMatrix.Dimension;
if (dimension < 21 || (dimension & 0x03) !== 1) {
throw 'Error BitMatrixParser';
}
this.bitMatrix = bitMatrix;
this.parsedVersion = null;
this.parsedFormatInfo = null;
this.copyBit = function(i, j, versionBits) {
return this.bitMatrix.getRenamed(i, j) ? (versionBits << 1) | 0x1 : versionBits << 1;
};
this.readFormatInformation = function() {
if (this.parsedFormatInfo !== null) {
return this.parsedFormatInfo;
}
// Read top-left format info bits
var formatInfoBits = 0;
var i;
for (i = 0; i < 6; i++) {
formatInfoBits = this.copyBit(i, 8, formatInfoBits);
}
// .. and skip a bit in the timing pattern ...
formatInfoBits = this.copyBit(7, 8, formatInfoBits);
formatInfoBits = this.copyBit(8, 8, formatInfoBits);
formatInfoBits = this.copyBit(8, 7, formatInfoBits);
// .. and skip a bit in the timing pattern ...
var j;
for (j = 5; j >= 0; j--) {
formatInfoBits = this.copyBit(8, j, formatInfoBits);
}
this.parsedFormatInfo = FormatInformation.decodeFormatInformation(formatInfoBits);
if (this.parsedFormatInfo !== null) {
return this.parsedFormatInfo;
}
// Hmm, failed. Try the top-right/bottom-left pattern
var dimension = this.bitMatrix.Dimension;
formatInfoBits = 0;
var iMin = dimension - 8;
for (i = dimension - 1; i >= iMin; i--) {
formatInfoBits = this.copyBit(i, 8, formatInfoBits);
}
for (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;
}
var dimension = this.bitMatrix.Dimension;
var provisionalVersion = (dimension - 17) >> 2;
if (provisionalVersion <= 6) {
return Version.getVersionForNumber(provisionalVersion);
}
// Read top-right version info: 3 wide by 6 tall
var versionBits = 0;
var i, j;
var ijMin = dimension - 11;
for (j = 5; j >= 0; j--) {
for (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;
}
// Hmm, failed. Try bottom left: 6 wide by 3 tall
versionBits = 0;
for (i = 5; i >= 0; i--) {
for (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() {