public static BitList GenerateCheckWords(BitList bits, int totalBits, int wordSize)
{
var rs = new ReedSolomonEncoder(GetGaloisField(wordSize));
// bits is guaranteed to be a multiple of the wordSize, so no padding needed
int messageWordCount = bits.Length / wordSize;
int totalWordCount = totalBits / wordSize;
int eccWordCount = totalWordCount - messageWordCount;
int[] messageWords = BitsToWords(bits, wordSize, messageWordCount);
int[] eccWords = rs.Encode(messageWords, eccWordCount);
int startPad = totalBits % wordSize;
var messageBits = new BitList();
messageBits.AddBits(0, (byte)startPad);
foreach (var messageWord in messageWords)
{
messageBits.AddBits((uint)messageWord, (byte)wordSize);
}
foreach (var eccWord in eccWords)
{
messageBits.AddBits((uint)eccWord, (byte)wordSize);
}
return(messageBits);
}
public static byte[] CalculateEcc(byte[] data, CodeSize size)
{
var dataSize = data.Length;
var result = new byte[data.Length + size.EccCount];
Array.Copy(data, result, data.Length);
for (int block = 0; block < size.BlockCount; block++)
{
var dataCnt = size.DataCodewordsForBlock(block);
var buff = new int[dataCnt];
// copy the data for the current block to buff
var j = 0;
for (int i = block; i < dataSize; i += size.BlockCount)
{
buff[j] = result[i];
j++;
}
// calc the error correction codes
var ecc = ReedSolomonEncoder.Encode(buff, size.ErrorCorrectionCodewordsPerBlock);
// and append them to the result
j = 0;
for (int i = block; i < size.ErrorCorrectionCodewordsPerBlock * size.BlockCount; i += size.BlockCount)
{
result[dataSize + i] = (byte)ecc[j];
j++;
}
}
return(result);
}
private void TestOneCase(byte[] data, int ecLength, byte[] expectResult)
{
byte[] result = ReedSolomonEncoder.Encode(data, ecLength, m_cacheGeneratorPoly);
if (!PolynomialExtensions.isEqual(result, expectResult))
{
Assert.Fail("Remainder not same. result {0}, expect {1}", result.Length, expectResult.Length);
}
}
public static byte[] CalculateEcc(byte[] data, byte eccCount)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
var dataInts = data.Select(x => (int)x).ToArray();
int[] res = ReedSolomonEncoder.Encode(dataInts, eccCount);
return(res.Select(x => (byte)x).ToArray());
}
public void PerformanceTest()
{
Random randomizer = new Random();
sbyte[] zxTestCase = PolynomialExtensions.GenerateSbyteArray(40, randomizer);
int ecBytes = 50;
byte[] testCase = PolynomialExtensions.ToByteArray(zxTestCase);
Stopwatch sw = new Stopwatch();
int timesofTest = 10000;
string[] timeElapsed = new string[2];
sw.Start();
GaloisField256 gf256 = GaloisField256.QRCodeGaloisField;
GeneratorPolynomial generator = new GeneratorPolynomial(gf256);
for (int i = 0; i < timesofTest; i++)
{
ReedSolomonEncoder.Encode(testCase, ecBytes, generator);
}
sw.Stop();
timeElapsed[0] = sw.ElapsedMilliseconds.ToString();
sw.Reset();
sw.Start();
for (int i = 0; i < timesofTest; i++)
{
EncoderInternal.generateECBytes(zxTestCase, ecBytes);
}
sw.Stop();
timeElapsed[1] = sw.ElapsedMilliseconds.ToString();
Assert.Pass("ReedSolomon performance {0} Tests~ QrCode.Net: {1} ZXing: {2}", timesofTest, timeElapsed[0], timeElapsed[1]);
}
/// <summary>
/// Generate error correction blocks. Then out put with codewords BitList
/// ISO/IEC 18004/2006 P45, 46. Chapter 6.6 Constructing final message codewords sequence.
/// </summary>
/// <param name="dataCodewords">Datacodewords from DataEncodation.DataEncode</param>
/// <param name="numTotalBytes">Total number of bytes</param>
/// <param name="numDataBytes">Number of data bytes</param>
/// <param name="numECBlocks">Number of Error Correction blocks</param>
/// <returns>codewords BitList contain datacodewords and ECCodewords</returns>
internal static BitList FillECCodewords(BitList dataCodewords, VersionDetail vd)
{
List <byte> dataCodewordsByte = dataCodewords.List;
int ecBlockGroup2 = vd.ECBlockGroup2;
int ecBlockGroup1 = vd.ECBlockGroup1;
int numDataBytesGroup1 = vd.NumDataBytesGroup1;
int numDataBytesGroup2 = vd.NumDataBytesGroup2;
int ecBytesPerBlock = vd.NumECBytesPerBlock;
int dataBytesOffset = 0;
byte[][] dByteJArray = new byte[vd.NumECBlocks][];
byte[][] ecByteJArray = new byte[vd.NumECBlocks][];
GaloisField256 gf256 = GaloisField256.QRCodeGaloisField;
GeneratorPolynomial generator = new GeneratorPolynomial(gf256);
for (int blockID = 0; blockID < vd.NumECBlocks; blockID++)
{
if (blockID < ecBlockGroup1)
{
dByteJArray[blockID] = new byte[numDataBytesGroup1];
for (int index = 0; index < numDataBytesGroup1; index++)
{
dByteJArray[blockID][index] = dataCodewordsByte[dataBytesOffset + index];
}
dataBytesOffset += numDataBytesGroup1;
}
else
{
dByteJArray[blockID] = new byte[numDataBytesGroup2];
for (int index = 0; index < numDataBytesGroup2; index++)
{
dByteJArray[blockID][index] = dataCodewordsByte[dataBytesOffset + index];
}
dataBytesOffset += numDataBytesGroup2;
}
ecByteJArray[blockID] = ReedSolomonEncoder.Encode(dByteJArray[blockID], ecBytesPerBlock, generator);
}
if (vd.NumDataBytes != dataBytesOffset)
{
throw new ArgumentException("Data bytes does not match offset");
}
BitList codewords = new BitList();
int maxDataLength = ecBlockGroup1 == vd.NumECBlocks ? numDataBytesGroup1 : numDataBytesGroup2;
for (int dataID = 0; dataID < maxDataLength; dataID++)
{
for (int blockID = 0; blockID < vd.NumECBlocks; blockID++)
{
if (!(dataID == numDataBytesGroup1 && blockID < ecBlockGroup1))
{
codewords.Add((int)dByteJArray[blockID][dataID], 8);
}
}
}
for (int ECID = 0; ECID < ecBytesPerBlock; ECID++)
{
for (int blockID = 0; blockID < vd.NumECBlocks; blockID++)
{
codewords.Add((int)ecByteJArray[blockID][ECID], 8);
}
}
if (vd.NumTotalBytes != codewords.Count >> 3)
{
throw new ArgumentException(string.Format("total bytes: {0}, actual bits: {1}", vd.NumTotalBytes, codewords.Count));
}
return(codewords);
}
public void Encode(int[] plainData, int erasures)
{
var rse = new ReedSolomonEncoder(_field);
rse.Encode(plainData, erasures);
}
