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(Pak0Opener): decrypt script files.

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This commit is contained in:
morkt 2016-08-04 05:08:04 +04:00
parent 85ec4b3a37
commit b812773c2a
1 changed files with 47 additions and 0 deletions
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47
ArcFormats/StudioEgo/ArcPAK0.cs
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@ -26,6 +26,7 @@
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Utility;
namespace GameRes.Formats.Ego
{
@ -63,6 +64,52 @@ namespace GameRes.Formats.Ego
var dir = reader.ReadIndex();
return null != dir ? new ArcFile (file, this, dir) : null;
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
if (entry.Size <= 0x1C || !arc.File.View.AsciiEqual (entry.Offset, "SCR "))
return base.OpenEntry (arc, entry);
uint version = arc.File.View.ReadUInt32 (entry.Offset+4);
uint method = arc.File.View.ReadUInt32 (entry.Offset+8);
if (0 == version || !(1 == method || 2 == method))
return base.OpenEntry (arc, entry);
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
DecryptScript (method, data);
return new MemoryStream (data);
}
unsafe void DecryptScript (uint method, byte[] script)
{
int length = LittleEndian.ToInt32 (script, 0x10);
if (length < 4 || length > script.Length + 0x14)
return;
uint key = LittleEndian.ToUInt32 (script, 0xC);
fixed (byte* data8 = &script[0x14])
{
uint* data32 = (uint*)data8;
length /= 4;
if (1 == method)
{
for (int i = 0; i < length; ++i)
{
if (0 == (i & 0xFF))
key = 0 == key ? 1u : 0u;
key += 0x7654321;
*data32++ ^= key;
}
}
else if (2 == method)
{
for (int i = 0; i < length; ++i)
{
if (0 == (i & 0xFF))
key = ~key;
key += 0x7654321;
*data32++ ^= key;
}
}
}
}
}
internal sealed class Pak0Reader