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Merge pull request #541 from RainThunder/clean-crc16

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Make CRC16 method more readable
This commit is contained in:
Kaphotics 2016-12-01 19:07:28 -08:00 committed by GitHub
commit 02dad2d75e
1 changed files with 2 additions and 16 deletions
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18
PKHeX/Saves/SaveUtil.cs
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@ -562,25 +562,11 @@ internal static ushort check16(byte[] data, int blockID, ushort initial = 0)
if (blockID == 36)
new byte[0x80].CopyTo(data, 0x100);
int len = data.Length;
ushort chk = (ushort)~initial;
if (len > 1)
for (int i = 0; i < data.Length; i++)
{
int ofs = -1;
if (len % 2 == 0) // always true, always even length
{
ofs = 0;
chk = (ushort)(crc16[(data[0] ^ chk) & 0xFF] ^ chk >> 8);
}
for (int i = (len - 1) / 2; i != 0; i--, ofs += 2)
{
ushort temp = crc16[(data[ofs + 1] ^ chk) & 0xFF];
chk = (ushort)(crc16[(data[ofs + 2] ^ temp ^ chk >> 8) & 0xFF] ^ (temp ^ chk >> 8) >> 8);
}
chk = (ushort)(crc16[(data[i] ^ chk) & 0xFF] ^ chk >> 8);
}
if (len > 0)
chk = (ushort)(crc16[(data[len - 1] ^ chk) & 0xFF] ^ chk >> 8);
return (ushort)~chk;
}