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(Pak0Opener): decrypt script files.
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@ -26,6 +26,7 @@
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using GameRes.Utility;
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namespace GameRes.Formats.Ego
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{
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@ -63,6 +64,52 @@ namespace GameRes.Formats.Ego
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var dir = reader.ReadIndex();
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return null != dir ? new ArcFile (file, this, dir) : null;
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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if (entry.Size <= 0x1C || !arc.File.View.AsciiEqual (entry.Offset, "SCR "))
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return base.OpenEntry (arc, entry);
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uint version = arc.File.View.ReadUInt32 (entry.Offset+4);
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uint method = arc.File.View.ReadUInt32 (entry.Offset+8);
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if (0 == version || !(1 == method || 2 == method))
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return base.OpenEntry (arc, entry);
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var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
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DecryptScript (method, data);
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return new MemoryStream (data);
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}
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unsafe void DecryptScript (uint method, byte[] script)
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{
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int length = LittleEndian.ToInt32 (script, 0x10);
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if (length < 4 || length > script.Length + 0x14)
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return;
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uint key = LittleEndian.ToUInt32 (script, 0xC);
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fixed (byte* data8 = &script[0x14])
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{
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uint* data32 = (uint*)data8;
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length /= 4;
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if (1 == method)
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{
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for (int i = 0; i < length; ++i)
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{
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if (0 == (i & 0xFF))
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key = 0 == key ? 1u : 0u;
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key += 0x7654321;
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*data32++ ^= key;
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}
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}
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else if (2 == method)
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{
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for (int i = 0; i < length; ++i)
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{
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if (0 == (i & 0xFF))
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key = ~key;
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key += 0x7654321;
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*data32++ ^= key;
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}
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}
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}
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}
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}
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internal sealed class Pak0Reader
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