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This commit is contained in:
chudov
2009-08-21 03:26:12 +00:00
parent 8b05f56afa
commit c27baada21
40 changed files with 2414 additions and 1930 deletions
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16
CUETools.Codecs/CRCs/CRC16.cs
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@@ -8,22 +8,18 @@ namespace CUETools.Codecs
{
ushort[] table = new ushort[256];
public ushort ComputeChecksum(byte[] bytes, int pos, int count)
public unsafe ushort ComputeChecksum(byte[] bytes, int pos, int count)
{
ushort crc = 0;
for (int i = pos; i < pos + count; i++)
{
crc = (ushort)(((crc << 8) & 0xffff) ^ table[(crc >> 8) ^ bytes[i]]);
}
return crc;
fixed (byte* bs = bytes)
return ComputeChecksum(bs + pos, count);
}
public unsafe ushort ComputeChecksum(byte* bytes, int pos, int count)
public unsafe ushort ComputeChecksum(byte* bytes, int count)
{
ushort crc = 0;
fixed (ushort* t = table)
for (int i = pos; i < pos + count; i++)
crc = (ushort)(((crc << 8) & 0xffff) ^ t[(crc >> 8) ^ bytes[i]]);
for (int i = count; i > 0; i--)
crc = (ushort)((crc << 8) ^ t[(crc >> 8) ^ *(bytes++)]);
return crc;
}