/// <summary>
///
/// </summary>
/// <param name="st"></param>
/// <param name="_sector"></param>
/// <returns></returns>
private bool decodeSectorTrailer(string st, MifareClassicSectorModel _sector)
{
byte[] _bytes = new byte[255];
int discarded = 0;
string[] sectorTrailer = st.Split(new[] { ',', ';' });
if (sectorTrailer.Count() != 3 ||
!(CustomConverter.IsInHexFormat(sectorTrailer[1]) && sectorTrailer[1].Length == 8) ||
!(CustomConverter.IsInHexFormat(sectorTrailer[0]) && sectorTrailer[0].Length == 12) ||
!(CustomConverter.IsInHexFormat(sectorTrailer[2]) && sectorTrailer[2].Length == 12))
{
return(true);
}
_bytes = CustomConverter.GetBytes(sectorTrailer[1], out discarded);
if (!decodeSectorTrailer(_bytes, ref _sector))
{
return(false);
}
else
{
return(true);
}
}
/// <summary>
/// Converts a given selection for either sector
/// access bits or datablock access bits to the equivalent 3 bytes sector trailer
/// </summary>
/// <param name="_sector"></param>
/// <returns></returns>
private string encodeSectorTrailer(MifareClassicSectorModel _sector)
{
byte[] st = new byte[4] {
0x00, 0x00, 0x00, 0xC3
};
uint sectorAccessBitsIndex = (uint)_sector.Cx; //_sector.Sector_AccessCondition.Cx;
uint dataBlock0AccessBitsIndex = (uint)_sector.DataBlock0.Cx; //(uint)dataBlock_AccessBits.IndexOf(_sector); //_sector.DataBlock0_AccessCondition.Cx;
uint dataBlock1AccessBitsIndex = (uint)_sector.DataBlock1.Cx; //_sector.DataBlock1_AccessCondition.Cx;
uint dataBlock2AccessBitsIndex = (uint)_sector.DataBlock2.Cx; //_sector.DataBlock2_AccessCondition.Cx;
// DataBlock 0 = C1/0; C2/0; C3/0
st[1] |= (byte)((dataBlock0AccessBitsIndex & 0x01) << 4); // C1/0
st[2] |= (byte)((dataBlock0AccessBitsIndex & 0x02) >> 1); // C2/0
st[2] |= (byte)((dataBlock0AccessBitsIndex & 0x04) << 2); // C3/0
// DataBlock 1 = C1/1; C2/1; C3/1
st[1] |= (byte)((dataBlock1AccessBitsIndex & 0x01) << 5); // C1/1
st[2] |= (byte)(dataBlock1AccessBitsIndex & 0x02); // C2/1
st[2] |= (byte)((dataBlock1AccessBitsIndex & 0x04) << 3); // C3/1
// DataBlock 2 = C1/2; C2/2; C3/2
st[1] |= (byte)((dataBlock2AccessBitsIndex & 0x01) << 6); // C1/2
st[2] |= (byte)((dataBlock2AccessBitsIndex & 0x02) << 1); // C2/2
st[2] |= (byte)((dataBlock2AccessBitsIndex & 0x04) << 4); // C3/2
// SectorAccessBits = C1/3; C2/3; C3/3
st[1] |= (byte)((sectorAccessBitsIndex & 0x01) << 7); // C1/3
st[2] |= (byte)((sectorAccessBitsIndex & 0x02) << 2); // C2/3
st[2] |= (byte)((sectorAccessBitsIndex & 0x04) << 5); // C3/3
st = CustomConverter.buildSectorTrailerInvNibble(st);
string[] stAsString;
// if (!string.IsNullOrWhiteSpace(_sector.AccessBitsAsString))
// stAsString = _sector.AccessBitsAsString.Split(new[] { ',', ';' });
// else
stAsString = new string[] { "FFFFFFFFFFFF", "FF0780C3", "FFFFFFFFFFFF" };
stAsString[1] = CustomConverter.HexToString(st);
return(string.Join(",", stAsString));
}
/// <summary>
/// turns a given byte or string sector trailer to a access bits selection
/// </summary>
/// <param name="st"></param>
/// <param name="_sector"></param>
/// <returns></returns>
private bool decodeSectorTrailer(byte[] st, ref MifareClassicSectorModel _sector)
{
uint C1x, C2x;
LibLogicalAccess.SectorAccessBits sab;
uint tmpAccessBitCx;
if (CustomConverter.SectorTrailerHasWrongFormat(st))
{
_sector = null;
return(true);
}
#region getAccessBitsForSectorTrailer
C1x = st[1];
C2x = st[2];
C1x &= 0xF0;
C1x >>= 7;
C1x &= 0x01;
sab.d_sector_trailer_access_bits.c1 = (short)C1x;
C2x >>= 2;
tmpAccessBitCx = C2x;
tmpAccessBitCx >>= 1;
tmpAccessBitCx &= 0x01;
sab.d_sector_trailer_access_bits.c2 = (short)tmpAccessBitCx;
C1x |= C2x;
C2x >>= 3;
tmpAccessBitCx = C2x;
tmpAccessBitCx >>= 2;
tmpAccessBitCx &= 0x01;
sab.d_sector_trailer_access_bits.c3 = (short)tmpAccessBitCx;
C1x &= 0x03;
C1x |= C2x;
C1x &= 0x07; //now we have C1³ + C2³ + C3³ as integer in C1x see mifare manual
//
// if (C1x == 4)
// isTransportConfiguration = true;
// else
// isTransportConfiguration = false;
_sector.SectorAccessCondition = sectorTrailer_AccessBits[(int)C1x];
#endregion getAccessBitsForSectorTrailer
#region getAccessBitsForDataBlock2
C1x = st[1];
C2x = st[2];
C1x &= 0xF0;
C1x >>= 6;
C1x &= 0x01;
sab.d_data_block2_access_bits.c1 = (short)C1x;
C2x >>= 1;
tmpAccessBitCx = C2x;
tmpAccessBitCx >>= 1;
tmpAccessBitCx &= 0x01;
sab.d_data_block2_access_bits.c2 = (short)tmpAccessBitCx;
C1x |= C2x;
//C2 &= 0xF8;
C2x >>= 3;
tmpAccessBitCx = C2x;
tmpAccessBitCx >>= 2;
tmpAccessBitCx &= 0x01;
sab.d_data_block2_access_bits.c3 = (short)tmpAccessBitCx;
C1x &= 0x03;
C1x |= C2x;
C1x &= 0x07;
//if(isTransportConfiguration)
// decodedBlock2AccessBits = dataBlockABs[C1x];
//else
// decodedBlock2AccessBits = dataBlockAB[C1x];
DataBlock2.DataBlockAccessCondition = dataBlock_AccessBits[(int)C1x];
//dataBlock2_AccessCondition = new DataBlock_AccessCondition(2, sab.d_data_block2_access_bits.c1, sab.d_data_block2_access_bits.c2, sab.d_data_block2_access_bits.c3);
#endregion getAccessBitsForDataBlock2
#region getAccessBitsForDataBlock1
C1x = st[1];
C2x = st[2];
C1x &= 0xF0;
C1x >>= 5;
C1x &= 0x01;
sab.d_data_block1_access_bits.c1 = (short)C1x;
C1x |= C2x;
tmpAccessBitCx = C2x;
tmpAccessBitCx >>= 1;
tmpAccessBitCx &= 0x01;
sab.d_data_block1_access_bits.c2 = (short)tmpAccessBitCx;
C2x >>= 3;
tmpAccessBitCx = C2x;
tmpAccessBitCx >>= 2;
tmpAccessBitCx &= 0x01;
sab.d_data_block1_access_bits.c3 = (short)tmpAccessBitCx;
C1x &= 0x03;
C1x |= C2x;
C1x &= 0x07;
//if(isTransportConfiguration)
// decodedBlock1AccessBits = dataBlockABs[C1x];
//else
// decodedBlock1AccessBits = dataBlockAB[C1x];
DataBlock1.DataBlockAccessCondition = dataBlock_AccessBits[(int)C1x];
#endregion getAccessBitsForDataBlock1
#region getAccessBitsForDataBlock0
C1x = st[1];
C2x = st[2];
C1x &= 0xF0;
C1x >>= 4;
C1x &= 0x01;
tmpAccessBitCx = C1x;
tmpAccessBitCx &= 0x01;
sab.d_data_block0_access_bits.c1 = (short)C1x;
tmpAccessBitCx = C2x;
tmpAccessBitCx &= 0x01;
sab.d_data_block0_access_bits.c2 = (short)C1x;
C2x <<= 1;
C1x |= C2x;
C2x >>= 3;
tmpAccessBitCx = C2x;
tmpAccessBitCx >>= 2;
tmpAccessBitCx &= 0x01;
sab.d_data_block0_access_bits.c3 = (short)C1x;
C2x &= 0xFC;
C1x &= 0x03;
C1x |= C2x;
C1x &= 0x07;
DataBlock0.DataBlockAccessCondition = dataBlock_AccessBits[(int)C1x];
if (DataBlock0.DataBlockAccessCondition == DataBlock1.DataBlockAccessCondition &&
DataBlock1.DataBlockAccessCondition == DataBlock2.DataBlockAccessCondition)
{
DataBlockCombined.DataBlockAccessCondition = DataBlock0.DataBlockAccessCondition;
}
#endregion getAccessBitsForDataBlock0
return(false);
}
