private static void SaveByteToBitArray(ref BitArray arr, byte data, int countBits = 8)
{
byte mask = (byte)(1 << (countBits - 1));
for (int i = 0; i < countBits; i++)
{
arr = QRCodesUtils.LeftShift(arr, 1);
arr[0] = (data & mask) != 0 ? true : false;
data <<= 1;
}
}
/// <summary>
/// Creates a QR code in the binary encoding.
/// </summary>
/// <param name="data">The user data for encoding.</param>
/// <param name="version">The QR code version.</param>
/// <param name="levelCorrection">The level of error correction.</param>
/// <returns>byte[]</returns>
public static byte[] EncodeQRCodeData(string data, int version, QRCodeErrorCorrection levelCorrection)
{
BitArray arrData;
UTF8Encoding utf8 = new UTF8Encoding();
var arrBytes = utf8.GetBytes(data);
byte codeMethod = MethodCode(QRCodeEncodingMethod.Binary);
int lengthStandard = QRCodesData.QRCodeMaxLengths[version - 1][(int)levelCorrection];
arrData = new BitArray(lengthStandard);
int bitsSaved = 0;
// Write the header
if (version < 10)
{
SaveByteToBitArray(ref arrData, codeMethod, 4);
SaveByteToBitArray(ref arrData, (byte)arrBytes.Length);
bitsSaved += 12;
}
else
{
SaveByteToBitArray(ref arrData, codeMethod, 4);
SaveByteToBitArray(ref arrData, (byte)((arrBytes.Length >> 8) & 0xFF));
SaveByteToBitArray(ref arrData, (byte)(arrBytes.Length & 0xFF));
bitsSaved += 20;
}
// No space for data error
if ((arrBytes.Length << 3) + bitsSaved + (bitsSaved % 8) > lengthStandard)
{
throw new InvalidOperationException();
}
// Write the data
foreach (var byteData in arrBytes)
{
SaveByteToBitArray(ref arrData, byteData);
}
// Align to full bytes size
bitsSaved += arrBytes.Length << 3;
int bitsTail = bitsSaved % 8;
arrData = QRCodesUtils.LeftShift(arrData, bitsTail);
AlignToFullSize(ref arrData, bitsSaved + bitsTail, lengthStandard);
int countBlocks = QRCodesData.QRCodeBlockCounts[version - 1][(int)levelCorrection];
var lengthBlocks = GetLengthOfBlocks(lengthStandard, countBlocks);
// Split the data into blocks
var dataBlocks = GetBlocks(lengthBlocks, arrData);
var countCorrection = QRCodesData.QRCodeCorrectionCounts[version - 1][(int)levelCorrection];
byte[] kCorrection = QRCodesData.QRCodeCorrectionK[(byte)countCorrection];
// Add correction codes to the blocks and return results
return(AddCorrectionCodeToBlocks(dataBlocks, countCorrection, kCorrection));
}
