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(WARC): another decryptor.

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This commit is contained in:
morkt
2017-02-03 11:48:54 +04:00
parent 25c36072a3
commit 97a6b331c5
3 changed files with 41 additions and 7 deletions
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31
ArcFormats/ShiinaRio/WarcEncryption.cs
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@@ -1126,4 +1126,35 @@ namespace GameRes.Formats.ShiinaRio
}
}
}
[Serializable]
public class CountCrypt : IDecryptExtra
{
public void Decrypt (byte[] data, int index, uint length, uint flags)
{
if (length >= 0x200 && (flags & 0x204) == 0x204)
DoCountCrypt (data, index, (int)length);
}
public void Encrypt (byte[] data, int index, uint length, uint flags)
{
if (length >= 0x200 && (flags & 0x104) == 0x104)
DoCountCrypt (data, index, (int)length);
}
void DoCountCrypt (byte[] data, int index, int length)
{
length = (length & 0x7E) | 1;
byte count_00 = 0, count_FF = 0;
for (int i = 0; i < length; ++i)
{
if (0xFF == data[index+i])
count_FF++;
else if (0 == data[index+i])
count_00++;
}
data[index + 0x100] ^= count_00;
data[index + 0x104] ^= count_FF;
}
}
}