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CRC16.cs
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CRC16.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace IPOCS
{
public static class CRC16
{
public static ushort Calculate(byte[] bytes)
{
const ushort poly = 4129;
ushort[] table = new ushort[256];
ushort initialValue = 0xffff;
ushort temp, a;
ushort crc = initialValue;
for (int i = 0; i < table.Length; ++i)
{
temp = 0;
a = (ushort)(i << 8);
for (int j = 0; j < 8; ++j)
{
if (((temp ^ a) & 0x8000) != 0)
temp = (ushort)((temp << 1) ^ poly);
else
temp <<= 1;
a <<= 1;
}
table[i] = temp;
}
for (int i = 0; i < bytes.Length; ++i)
{
crc = (ushort)((crc << 8) ^ table[((crc >> 8) ^ (0xff & bytes[i]))]);
}
return crc;
}
}
}