/// <summary>
/// データブロックを返します。
/// </summary>
private Byte[][] BuildDataBlock()
{
byte[] dataBytes = GetMessageBytes();
int numPreBlocks = RSBlock.GetTotalNumber(
_parent.ErrorCorrectionLevel, _currVersion, true);
int numFolBlocks = RSBlock.GetTotalNumber(
_parent.ErrorCorrectionLevel, _currVersion, false);
byte[][] ret = new byte[numPreBlocks + numFolBlocks][];
int numPreBlockDataCodewords = RSBlock.GetNumberDataCodewords(
_parent.ErrorCorrectionLevel, _currVersion, true);
int index = 0;
for (int i = 0; i < numPreBlocks; ++i)
{
byte[] data = new byte[numPreBlockDataCodewords];
Array.Copy(dataBytes, index, data, 0, data.Length);
index += data.Length;
ret[i] = data;
}
int numFolBlockDataCodewords = RSBlock.GetNumberDataCodewords(
_parent.ErrorCorrectionLevel, _currVersion, false);
for (int i = numPreBlocks; i < numPreBlocks + numFolBlocks; ++i)
{
byte[] data = new byte[numFolBlockDataCodewords];
Array.Copy(dataBytes, index, data, 0, data.Length);
index += data.Length;
ret[i] = data;
}
return(ret);
}
/// <summary>
/// 誤り訂正データ領域のブロックを生成します。
/// </summary>
/// <param name="dataBlock">データ領域のブロック</param>
private byte[][] BuildErrorCorrectionBlock(byte[][] dataBlock)
{
int numECCodewords = RSBlock.GetNumberECCodewords(
_parent.ErrorCorrectionLevel, _currVersion);
int numPreBlocks = RSBlock.GetTotalNumber(
_parent.ErrorCorrectionLevel, _currVersion, true);
int numFolBlocks = RSBlock.GetTotalNumber(
_parent.ErrorCorrectionLevel, _currVersion, false);
byte[][] ret = new byte[numPreBlocks + numFolBlocks][];
for (int i = 0; i < ret.Length; ++i)
{
ret[i] = new byte[numECCodewords];
}
int[] gp = GeneratorPolynomials.Item(numECCodewords);
for (int blockIndex = 0; blockIndex < dataBlock.Length; ++blockIndex)
{
int size = dataBlock[blockIndex].Length + ret[blockIndex].Length;
int[] data = new int[size];
int eccIndex = data.Length - 1;
for (int i = 0; i < dataBlock[blockIndex].Length; ++i)
{
data[eccIndex] = dataBlock[blockIndex][i];
eccIndex--;
}
for (int i = data.Length - 1; i >= numECCodewords; --i)
{
if (data[i] > 0)
{
int exp = GaloisField256.ToExp(data[i]);
eccIndex = i;
for (int j = gp.Length - 1; j >= 0; --j)
{
data[eccIndex] ^= GaloisField256.ToInt((gp[j] + exp) % 255);
eccIndex--;
}
}
}
eccIndex = numECCodewords - 1;
for (int i = 0; i < ret[blockIndex].Length; ++i)
{
ret[blockIndex][i] = (byte)data[eccIndex];
eccIndex--;
}
}
return(ret);
}