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d4efd44fb0
git-svn-id: https://zxing.googlecode.com/svn/trunk@1202 59b500cc-1b3d-0410-9834-0bbf25fbcc57
547 lines
16 KiB
C#
Executable file
547 lines
16 KiB
C#
Executable file
/*
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* Copyright 2007 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using ReaderException = com.google.zxing.ReaderException;
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using BitMatrix = com.google.zxing.common.BitMatrix;
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namespace com.google.zxing.datamatrix.decoder
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{
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/// <author> bbrown@google.com (Brian Brown)
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/// </author>
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/// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source
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/// </author>
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sealed class BitMatrixParser
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{
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//UPGRADE_NOTE: Final was removed from the declaration of 'mappingBitMatrix '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
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private BitMatrix mappingBitMatrix;
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//UPGRADE_NOTE: Final was removed from the declaration of 'readMappingMatrix '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
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private BitMatrix readMappingMatrix;
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//UPGRADE_NOTE: Final was removed from the declaration of 'version '. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
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private Version version;
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/// <param name="bitMatrix">{@link BitMatrix} to parse
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/// </param>
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/// <throws> ReaderException if dimension is < 10 or > 144 or not 0 mod 2 </throws>
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internal BitMatrixParser(BitMatrix bitMatrix)
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{
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int dimension = bitMatrix.Dimension;
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if (dimension < 10 || dimension > 144 || (dimension & 0x01) != 0)
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{
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throw ReaderException.Instance;
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}
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version = readVersion(bitMatrix);
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this.mappingBitMatrix = extractDataRegion(bitMatrix);
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// TODO(bbrown): Make this work for rectangular symbols
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this.readMappingMatrix = new BitMatrix(this.mappingBitMatrix.Dimension);
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}
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/// <summary> <p>Creates the version object based on the dimension of the original bit matrix from
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/// the datamatrix code.</p>
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///
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/// <p>See ISO 16022:2006 Table 7 - ECC 200 symbol attributes</p>
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///
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/// </summary>
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/// <param name="bitMatrix">Original {@link BitMatrix} including alignment patterns
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/// </param>
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/// <returns> {@link Version} encapsulating the Data Matrix Code's "version"
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/// </returns>
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/// <throws> ReaderException if the dimensions of the mapping matrix are not valid </throws>
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/// <summary> Data Matrix dimensions.
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/// </summary>
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internal Version readVersion(BitMatrix bitMatrix)
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{
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if (version != null)
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{
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return version;
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}
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// TODO(bbrown): make this work for rectangular dimensions as well.
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int numRows = bitMatrix.Dimension;
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int numColumns = numRows;
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return Version.getVersionForDimensions(numRows, numColumns);
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}
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/// <summary> <p>Reads the bits in the {@link BitMatrix} representing the mapping matrix (No alignment patterns)
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/// in the correct order in order to reconstitute the codewords bytes contained within the
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/// Data Matrix Code.</p>
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///
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/// </summary>
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/// <returns> bytes encoded within the Data Matrix Code
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/// </returns>
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/// <throws> ReaderException if the exact number of bytes expected is not read </throws>
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internal sbyte[] readCodewords()
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{
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sbyte[] result = new sbyte[version.TotalCodewords];
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int resultOffset = 0;
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int row = 4;
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int column = 0;
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// TODO(bbrown): Data Matrix can be rectangular, assuming square for now
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int numRows = mappingBitMatrix.Dimension;
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int numColumns = numRows;
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bool corner1Read = false;
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bool corner2Read = false;
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bool corner3Read = false;
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bool corner4Read = false;
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// Read all of the codewords
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do
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{
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// Check the four corner cases
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if ((row == numRows) && (column == 0) && !corner1Read)
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{
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result[resultOffset++] = (sbyte) readCorner1(numRows, numColumns);
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row -= 2;
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column += 2;
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corner1Read = true;
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}
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else if ((row == numRows - 2) && (column == 0) && ((numColumns & 0x03) != 0) && !corner2Read)
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{
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result[resultOffset++] = (sbyte) readCorner2(numRows, numColumns);
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row -= 2;
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column += 2;
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corner2Read = true;
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}
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else if ((row == numRows + 4) && (column == 2) && ((numColumns & 0x07) == 0) && !corner3Read)
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{
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result[resultOffset++] = (sbyte) readCorner3(numRows, numColumns);
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row -= 2;
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column += 2;
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corner3Read = true;
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}
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else if ((row == numRows - 2) && (column == 0) && ((numColumns & 0x07) == 4) && !corner4Read)
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{
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result[resultOffset++] = (sbyte) readCorner4(numRows, numColumns);
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row -= 2;
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column += 2;
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corner4Read = true;
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}
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else
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{
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// Sweep upward diagonally to the right
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do
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{
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if ((row < numRows) && (column >= 0) && !readMappingMatrix.get_Renamed(column, row))
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{
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result[resultOffset++] = (sbyte) readUtah(row, column, numRows, numColumns);
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}
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row -= 2;
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column += 2;
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}
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while ((row >= 0) && (column < numColumns));
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row += 1;
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column += 3;
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// Sweep downward diagonally to the left
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do
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{
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if ((row >= 0) && (column < numColumns) && !readMappingMatrix.get_Renamed(column, row))
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{
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result[resultOffset++] = (sbyte) readUtah(row, column, numRows, numColumns);
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}
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row += 2;
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column -= 2;
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}
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while ((row < numRows) && (column >= 0));
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row += 3;
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column += 1;
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}
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}
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while ((row < numRows) || (column < numColumns));
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if (resultOffset != version.TotalCodewords)
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{
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throw ReaderException.Instance;
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}
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return result;
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}
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/// <summary> <p>Reads a bit of the mapping matrix accounting for boundary wrapping.</p>
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///
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/// </summary>
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/// <param name="row">Row to read in the mapping matrix
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/// </param>
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/// <param name="column">Column to read in the mapping matrix
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/// </param>
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/// <param name="numRows">Number of rows in the mapping matrix
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/// </param>
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/// <param name="numColumns">Number of columns in the mapping matrix
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/// </param>
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/// <returns> value of the given bit in the mapping matrix
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/// </returns>
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internal bool readModule(int row, int column, int numRows, int numColumns)
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{
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// Adjust the row and column indices based on boundary wrapping
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if (row < 0)
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{
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row += numRows;
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column += 4 - ((numRows + 4) & 0x07);
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}
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if (column < 0)
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{
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column += numColumns;
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row += 4 - ((numColumns + 4) & 0x07);
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}
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readMappingMatrix.set_Renamed(column, row);
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return mappingBitMatrix.get_Renamed(column, row);
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}
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/// <summary> <p>Reads the 8 bits of the standard Utah-shaped pattern.</p>
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///
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/// <p>See ISO 16022:2006, 5.8.1 Figure 6</p>
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///
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/// </summary>
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/// <param name="row">Current row in the mapping matrix, anchored at the 8th bit (LSB) of the pattern
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/// </param>
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/// <param name="column">Current column in the mapping matrix, anchored at the 8th bit (LSB) of the pattern
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/// </param>
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/// <param name="numRows">Number of rows in the mapping matrix
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/// </param>
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/// <param name="numColumns">Number of columns in the mapping matrix
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/// </param>
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/// <returns> byte from the utah shape
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/// </returns>
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internal int readUtah(int row, int column, int numRows, int numColumns)
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{
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int currentByte = 0;
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if (readModule(row - 2, column - 2, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(row - 2, column - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(row - 1, column - 2, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(row - 1, column - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(row - 1, column, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(row, column - 2, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(row, column - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(row, column, numRows, numColumns))
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{
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currentByte |= 1;
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}
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return currentByte;
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}
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/// <summary> <p>Reads the 8 bits of the special corner condition 1.</p>
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///
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/// <p>See ISO 16022:2006, Figure F.3</p>
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///
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/// </summary>
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/// <param name="numRows">Number of rows in the mapping matrix
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/// </param>
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/// <param name="numColumns">Number of columns in the mapping matrix
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/// </param>
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/// <returns> byte from the Corner condition 1
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/// </returns>
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internal int readCorner1(int numRows, int numColumns)
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{
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int currentByte = 0;
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if (readModule(numRows - 1, 0, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(numRows - 1, 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(numRows - 1, 2, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(0, numColumns - 2, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(0, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(1, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(2, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(3, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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return currentByte;
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}
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/// <summary> <p>Reads the 8 bits of the special corner condition 2.</p>
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///
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/// <p>See ISO 16022:2006, Figure F.4</p>
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///
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/// </summary>
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/// <param name="numRows">Number of rows in the mapping matrix
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/// </param>
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/// <param name="numColumns">Number of columns in the mapping matrix
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/// </param>
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/// <returns> byte from the Corner condition 2
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/// </returns>
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internal int readCorner2(int numRows, int numColumns)
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{
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int currentByte = 0;
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if (readModule(numRows - 3, 0, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(numRows - 2, 0, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(numRows - 1, 0, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(0, numColumns - 4, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(0, numColumns - 3, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(0, numColumns - 2, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(0, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(1, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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return currentByte;
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}
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/// <summary> <p>Reads the 8 bits of the special corner condition 3.</p>
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///
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/// <p>See ISO 16022:2006, Figure F.5</p>
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///
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/// </summary>
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/// <param name="numRows">Number of rows in the mapping matrix
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/// </param>
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/// <param name="numColumns">Number of columns in the mapping matrix
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/// </param>
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/// <returns> byte from the Corner condition 3
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/// </returns>
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internal int readCorner3(int numRows, int numColumns)
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{
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int currentByte = 0;
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if (readModule(numRows - 1, 0, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(numRows - 1, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(0, numColumns - 3, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(0, numColumns - 2, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(0, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(1, numColumns - 3, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(1, numColumns - 2, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(1, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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return currentByte;
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}
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/// <summary> <p>Reads the 8 bits of the special corner condition 4.</p>
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///
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/// <p>See ISO 16022:2006, Figure F.6</p>
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///
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/// </summary>
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/// <param name="numRows">Number of rows in the mapping matrix
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/// </param>
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/// <param name="numColumns">Number of columns in the mapping matrix
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/// </param>
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/// <returns> byte from the Corner condition 4
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/// </returns>
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internal int readCorner4(int numRows, int numColumns)
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{
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int currentByte = 0;
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if (readModule(numRows - 3, 0, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(numRows - 2, 0, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(numRows - 1, 0, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(0, numColumns - 2, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(0, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(1, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(2, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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currentByte <<= 1;
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if (readModule(3, numColumns - 1, numRows, numColumns))
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{
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currentByte |= 1;
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}
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return currentByte;
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}
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/// <summary> <p>Extracts the data region from a {@link BitMatrix} that contains
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/// alignment patterns.</p>
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///
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/// </summary>
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/// <param name="bitMatrix">Original {@link BitMatrix} with alignment patterns
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/// </param>
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/// <returns> BitMatrix that has the alignment patterns removed
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/// </returns>
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internal BitMatrix extractDataRegion(BitMatrix bitMatrix)
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{
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int symbolSizeRows = version.SymbolSizeRows;
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int symbolSizeColumns = version.SymbolSizeColumns;
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// TODO(bbrown): Make this work with rectangular codes
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if (bitMatrix.Dimension != symbolSizeRows)
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{
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throw new System.ArgumentException("Dimension of bitMarix must match the version size");
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}
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int dataRegionSizeRows = version.DataRegionSizeRows;
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int dataRegionSizeColumns = version.DataRegionSizeColumns;
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int numDataRegionsRow = symbolSizeRows / dataRegionSizeRows;
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int numDataRegionsColumn = symbolSizeColumns / dataRegionSizeColumns;
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int sizeDataRegionRow = numDataRegionsRow * dataRegionSizeRows;
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//int sizeDataRegionColumn = numDataRegionsColumn * dataRegionSizeColumns;
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// TODO(bbrown): Make this work with rectangular codes
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BitMatrix bitMatrixWithoutAlignment = new BitMatrix(sizeDataRegionRow);
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for (int dataRegionRow = 0; dataRegionRow < numDataRegionsRow; ++dataRegionRow)
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{
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int dataRegionRowOffset = dataRegionRow * dataRegionSizeRows;
|
|
for (int dataRegionColumn = 0; dataRegionColumn < numDataRegionsColumn; ++dataRegionColumn)
|
|
{
|
|
int dataRegionColumnOffset = dataRegionColumn * dataRegionSizeColumns;
|
|
for (int i = 0; i < dataRegionSizeRows; ++i)
|
|
{
|
|
int readRowOffset = dataRegionRow * (dataRegionSizeRows + 2) + 1 + i;
|
|
int writeRowOffset = dataRegionRowOffset + i;
|
|
for (int j = 0; j < dataRegionSizeColumns; ++j)
|
|
{
|
|
int readColumnOffset = dataRegionColumn * (dataRegionSizeColumns + 2) + 1 + j;
|
|
if (bitMatrix.get_Renamed(readColumnOffset, readRowOffset))
|
|
{
|
|
int writeColumnOffset = dataRegionColumnOffset + j;
|
|
bitMatrixWithoutAlignment.set_Renamed(writeColumnOffset, writeRowOffset);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return bitMatrixWithoutAlignment;
|
|
}
|
|
}
|
|
} |