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Calculating CRC32 with offsets and fast

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chudov
2010-02-09 20:05:54 +00:00
parent 6d5e0602bd
commit 478799379a
21 changed files with 770 additions and 92 deletions
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28
CUETools.Codecs/CRCs/CRC32.cs
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@@ -44,34 +44,6 @@ namespace CUETools.Codecs
return crc;
}
public unsafe uint ComputeChecksumWONULL(uint crc, short* samples, int count)
{
fixed (uint* t = table)
for (int i = 0; i < count; i++)
{
short s1 = samples[i];
if (s1 != 0)
{
crc = (crc >> 8) ^ t[(crc ^ s1) & 0xff];
crc = (crc >> 8) ^ t[(crc ^ (s1 >> 8)) & 0xff];
}
}
return crc;
}
public unsafe uint ComputeChecksumWONULL(uint crc, int* samples, int count)
{
for (int i = 0; i < count; i++)
{
int s1 = samples[2 * i], s2 = samples[2 * i + 1];
if (s1 != 0)
crc = ComputeChecksum(ComputeChecksum(crc, (byte)s1), (byte)(s1 >> 8));
if (s2 != 0)
crc = ComputeChecksum(ComputeChecksum(crc, (byte)s2), (byte)(s2 >> 8));
}
return crc;
}
uint Reflect(uint val, int ch)
{
uint value = 0;