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(EntryReadFilter): added 'mdf' decompressor.

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(GakuenButouCrypt): removed as duplicate.
This commit is contained in:
morkt 2018-11-23 06:19:34 +04:00
parent 418cb00051
commit 7253c529e9
1 changed files with 21 additions and 33 deletions
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54
ArcFormats/KiriKiri/CryptAlgorithms.cs
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@ -102,12 +102,17 @@ namespace GameRes.Formats.KiriKiri
var header = new byte[5];
input.Read (header, 0, 5);
if (0x184D2204 == header.ToInt32 (0)) // LZ4 magic
uint signature = header.ToUInt32 (0);
if (0x184D2204 == signature) // LZ4 magic
{
// assume no scripts are compressed using LZ4, return decompressed stream right away
return DecompressLz4 (entry, header, input);
}
if (0xFE == header[0] && 0xFE == header[1] && header[2] < 3 && 0xFF == header[3] && 0xFE == header[4])
if (0x66646D == signature) // 'mdf'
{
return DecompressMdf (entry, header, input);
}
if ((signature & 0xFF00FFFFu) == 0xFF00FEFEu && header[2] < 3 && 0xFE == header[4])
return DecryptScript (header[2], input, entry.UnpackedSize);
if (!input.CanSeek)
@ -116,6 +121,17 @@ namespace GameRes.Formats.KiriKiri
return input;
}
internal Stream DecompressMdf (Xp3Entry entry, byte[] header, Stream input)
{
if (header.Length != 5)
throw new ArgumentException ("Invalid header length for DecompressMdf", "header");
var mdf_header = new byte[4] { header[4], 0, 0, 0 };
input.Read (mdf_header, 1, 3);
entry.UnpackedSize = mdf_header.ToUInt32 (0);
entry.IsPacked = true;
return new ZLibStream (input, CompressionMode.Decompress);
}
internal Stream DecompressLz4 (Xp3Entry entry, byte[] header, Stream input)
{
if (header.Length != 5)
@ -607,34 +623,6 @@ namespace GameRes.Formats.KiriKiri
}
}
[Serializable]
public class GakuenButouCrypt : ICrypt
{
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
{
if (0 != (offset & 1))
return (byte)(value ^ offset);
else
return (byte)(value ^ entry.Hash);
}
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
{
for (int i = 0; i < count; ++i, ++offset)
{
if (0 != (offset & 1))
values[pos+i] ^= (byte)offset;
else
values[pos+i] ^= (byte)entry.Hash;
}
}
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
{
Decrypt (entry, offset, values, pos, count);
}
}
[Serializable]
public class AlteredPinkCrypt : ICrypt
{
@ -781,12 +769,12 @@ namespace GameRes.Formats.KiriKiri
var ext_bin = new byte[16];
Encodings.cp932.GetBytes (ext, 0, Math.Min (4, ext.Length), ext_bin, 0);
key = ~LittleEndian.ToUInt32 (ext_bin, 0);
if (".asd\0.ks\0.tjs\0".Contains (ext+'\0'))
return entry.Size;
if (".asd.tjs.ks".Contains (ext))
return entry.UnpackedSize;
}
else
key = uint.MaxValue;
return Math.Min (entry.Size, 0x100u);
return Math.Min (entry.UnpackedSize, 0x100u);
}
}