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https://gitee.com/akwkevin/aistudio.-wpf.-diagram
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520 lines
18 KiB
C#
520 lines
18 KiB
C#
/*
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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 ZXing.Common;
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namespace ZXing.Datamatrix.Internal
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{
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/// <summary>
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/// <author>bbrown@google.com (Brian Brown)</author>
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/// </summary>
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sealed class BitMatrixParser
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{
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private readonly BitMatrix mappingBitMatrix;
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private readonly BitMatrix readMappingMatrix;
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private readonly Version version;
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/// <summary>
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/// <param name="bitMatrix"><see cref="BitMatrix" />to parse</param>
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/// <exception cref="FormatException">if dimension is < 8 or >144 or not 0 mod 2</exception>
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/// </summary>
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internal BitMatrixParser(BitMatrix bitMatrix)
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{
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int dimension = bitMatrix.Height;
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if (dimension < 8 || dimension > 144 || (dimension & 0x01) != 0)
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{
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return;
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}
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version = readVersion(bitMatrix);
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if (version != null)
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{
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mappingBitMatrix = extractDataRegion(bitMatrix);
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readMappingMatrix = new BitMatrix(mappingBitMatrix.Width, mappingBitMatrix.Height);
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}
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}
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public Version Version
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{
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get { return version; }
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}
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/// <summary>
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/// <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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/// <param name="bitMatrix">Original <see cref="BitMatrix" />including alignment patterns</param>
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/// <returns><see cref="Version" />encapsulating the Data Matrix Code's "version"</returns>
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/// <exception cref="FormatException">if the dimensions of the mapping matrix are not valid</exception>
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/// Data Matrix dimensions.
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/// </summary>
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internal static Version readVersion(BitMatrix bitMatrix)
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{
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int numRows = bitMatrix.Height;
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int numColumns = bitMatrix.Width;
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return Version.getVersionForDimensions(numRows, numColumns);
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}
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/// <summary>
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/// <p>Reads the bits in the <see cref="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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/// <returns>bytes encoded within the Data Matrix Code</returns>
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/// <exception cref="FormatException">if the exact number of bytes expected is not read</exception>
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/// </summary>
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internal byte[] readCodewords()
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{
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byte[] result = new byte[version.getTotalCodewords()];
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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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int numRows = mappingBitMatrix.Height;
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int numColumns = mappingBitMatrix.Width;
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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++] = (byte)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++] = (byte)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++] = (byte)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++] = (byte)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[column, row])
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{
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result[resultOffset++] = (byte)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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} 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[column, row])
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{
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result[resultOffset++] = (byte)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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} 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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} while ((row < numRows) || (column < numColumns));
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if (resultOffset != version.getTotalCodewords())
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{
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return null;
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}
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return result;
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}
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/// <summary>
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/// <p>Reads a bit of the mapping matrix accounting for boundary wrapping.</p>
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///
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/// <param name="row">Row to read in the mapping matrix</param>
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/// <param name="column">Column to read in the mapping matrix</param>
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/// <param name="numRows">Number of rows in the mapping matrix</param>
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/// <param name="numColumns">Number of columns in the mapping matrix</param>
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/// <returns>value of the given bit in the mapping matrix</returns>
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/// </summary>
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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[column, row] = true;
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return mappingBitMatrix[column, row];
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}
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/// <summary>
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/// <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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/// <param name="row">Current row in the mapping matrix, anchored at the 8th bit (LSB) of the pattern</param>
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/// <param name="column">Current column in the mapping matrix, anchored at the 8th bit (LSB) of the pattern</param>
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/// <param name="numRows">Number of rows in the mapping matrix</param>
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/// <param name="numColumns">Number of columns in the mapping matrix</param>
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/// <returns>byte from the utah shape</returns>
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/// </summary>
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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>
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/// <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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/// <param name="numRows">Number of rows in the mapping matrix</param>
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/// <param name="numColumns">Number of columns in the mapping matrix</param>
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/// <returns>byte from the Corner condition 1</returns>
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/// </summary>
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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>
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/// <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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/// <param name="numRows">Number of rows in the mapping matrix</param>
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/// <param name="numColumns">Number of columns in the mapping matrix</param>
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/// <returns>byte from the Corner condition 2</returns>
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/// </summary>
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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>
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/// <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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/// <param name="numRows">Number of rows in the mapping matrix</param>
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/// <param name="numColumns">Number of columns in the mapping matrix</param>
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/// <returns>byte from the Corner condition 3</returns>
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/// </summary>
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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>
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/// <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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/// <param name="numRows">Number of rows in the mapping matrix</param>
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/// <param name="numColumns">Number of columns in the mapping matrix</param>
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/// <returns>byte from the Corner condition 4</returns>
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/// </summary>
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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>
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/// <p>Extracts the data region from a <see cref="BitMatrix" />that contains
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/// alignment patterns.</p>
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///
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/// <param name="bitMatrix">Original <see cref="BitMatrix" />with alignment patterns</param>
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/// <returns>BitMatrix that has the alignment patterns removed</returns>
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/// </summary>
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BitMatrix extractDataRegion(BitMatrix bitMatrix)
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{
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int symbolSizeRows = version.getSymbolSizeRows();
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int symbolSizeColumns = version.getSymbolSizeColumns();
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if (bitMatrix.Height != symbolSizeRows)
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{
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throw new ArgumentException("Dimension of bitMarix must match the version size");
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}
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int dataRegionSizeRows = version.getDataRegionSizeRows();
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int dataRegionSizeColumns = version.getDataRegionSizeColumns();
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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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BitMatrix bitMatrixWithoutAlignment = new BitMatrix(sizeDataRegionColumn, sizeDataRegionRow);
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for (int dataRegionRow = 0; dataRegionRow < numDataRegionsRow; ++dataRegionRow)
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{
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int dataRegionRowOffset = dataRegionRow * dataRegionSizeRows;
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for (int dataRegionColumn = 0; dataRegionColumn < numDataRegionsColumn; ++dataRegionColumn)
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{
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int dataRegionColumnOffset = dataRegionColumn * dataRegionSizeColumns;
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for (int i = 0; i < dataRegionSizeRows; ++i)
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{
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int readRowOffset = dataRegionRow * (dataRegionSizeRows + 2) + 1 + i;
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int writeRowOffset = dataRegionRowOffset + i;
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for (int j = 0; j < dataRegionSizeColumns; ++j)
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{
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int readColumnOffset = dataRegionColumn * (dataRegionSizeColumns + 2) + 1 + j;
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if (bitMatrix[readColumnOffset, readRowOffset])
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{
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int writeColumnOffset = dataRegionColumnOffset + j;
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bitMatrixWithoutAlignment[writeColumnOffset, writeRowOffset] = true;
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}
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}
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}
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}
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}
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return bitMatrixWithoutAlignment;
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}
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}
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}
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