/********EXTERNAL OBJECT PUBLIC METHODS - END ********/
private string CalculateCRC(byte[] input, ChecksumAlgorithm checksumAlgorithm)
{
CRCParameters parms = ChecksumAlgorithmUtils.getParameters(checksumAlgorithm, this.error);
if (this.HasError())
{
return("");
}
long aux = CalculateCRC(input, parms);
if (aux == 0 || this.HasError())
{
return("");
}
switch (parms.Width)
{
case 8:
return(aux.ToString("X2"));
case 16:
return(aux.ToString("X4"));
case 32:
return(aux.ToString("X8"));
default:
return(aux.ToString("X"));
}
}
private long CalculateCRC(byte[] input, CRCParameters parms)
{
long curValue = parms.Init;
long topBit = 1L << (parms.Width - 1);
long mask = (topBit << 1) - 1;
for (int i = 0; i < input.Length; i++)
{
long curByte = ((long)(input[i])) & 0x00FFL;
if (parms.ReflectIn)
{
curByte = Reflect(curByte, 8);
}
for (int j = 0x80; j != 0; j >>= 1)
{
long bit = curValue & topBit;
curValue <<= 1;
if ((curByte & j) != 0)
{
bit ^= topBit;
}
if (bit != 0)
{
curValue ^= parms.Polynomial;
}
}
}
if (parms.ReflectOut)
{
curValue = Reflect(curValue, parms.Width);
}
curValue = curValue ^ parms.FinalXor;
return(curValue & mask);
}
// Construct a new CRC algorithm object
public CRC(CRCParameters param)
{
m_Params = param;
// initialize some bitmasks
m_CRCMask = ((((ulong)1 << (m_Params.Width - 1)) - 1) << 1) | 1;
m_CRCHighBitMask = (ulong)1 << (m_Params.Width - 1);
if (m_Params.Width > 7)
{
GenerateTable();
}
}
