TheXamlGuy
68 lines
2.1 KiB
C#
68 lines
2.1 KiB
C#
namespace Gma.QrCodeNet.Encoding.EncodingRegion;
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/// <summary>
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/// Embed version information for version larger than or equal to 7.
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/// </summary>
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/// <remarks>ISO/IEC 18004:2000 Chapter 8.10 Page 54</remarks>
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internal static class VersionInformation
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{
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private const int VIRectangleHeight = 3;
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private const int VIRectangleWidth = 6;
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private const int LengthDataBits = 6;
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private const int LengthECBits = 12;
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private const int VersionBCHPoly = 0x1f25;
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/// <summary>
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/// Embed version information to Matrix
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/// Only for version greater than or equal to 7
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/// </summary>
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internal static void EmbedVersionInformation(this TriStateMatrix tsMatrix, int version)
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{
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if (version < 7)
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{
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return;
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}
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BitList versionInfo = VersionInfoBitList(version);
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int matrixWidth = tsMatrix.Width;
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// 1 cell between version info and position stencil
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int shiftLength = QRCodeConstantVariable.PositionStencilWidth + VIRectangleHeight + 1;
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// Reverse order input
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int viIndex = LengthDataBits + LengthECBits - 1;
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for (int viWidth = 0; viWidth < VIRectangleWidth; viWidth++)
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{
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for (int viHeight = 0; viHeight < VIRectangleHeight; viHeight++)
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{
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bool bit = versionInfo[viIndex];
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viIndex--;
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// Bottom left
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tsMatrix[viWidth, (matrixWidth - shiftLength + viHeight), MatrixStatus.NoMask] = bit;
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// Top right
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tsMatrix[(matrixWidth - shiftLength + viHeight), viWidth, MatrixStatus.NoMask] = bit;
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}
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}
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}
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private static BitList VersionInfoBitList(int version)
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{
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BitList result = new()
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{
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{ version, LengthDataBits },
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{ BCHCalculator.CalculateBCH(version, VersionBCHPoly), LengthECBits }
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};
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if (result.Count != (LengthECBits + LengthDataBits))
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{
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throw new Exception("Version Info creation error. Result is not 18 bits");
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}
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return result;
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}
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} |