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Code Issues Projects Releases Wiki Activity

(PACKDAT): cosmetic changes.

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This commit is contained in:
morkt 2016-08-18 14:48:50 +04:00
parent d4c5941231
commit 6df62f37eb
1 changed files with 17 additions and 17 deletions
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34
ArcFormats/ArcPACKDAT.cs
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@ -2,7 +2,7 @@
//! \date Mon Jan 19 08:57:16 2015
//! \brief Innocent Grey archives format.
//
// Copyright (C) 2015 by morkt
// Copyright (C) 2015-2016 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
@ -23,10 +23,10 @@
// IN THE SOFTWARE.
//
using System;
using System.IO;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using GameRes.Utility;
namespace GameRes.Formats.SystemEpsylon
{
@ -54,7 +54,7 @@ namespace GameRes.Formats.SystemEpsylon
if (!file.View.AsciiEqual (4, "DAT."))
return null;
int count = file.View.ReadInt32 (8);
if (count <= 0 || count > 0xfffff)
if (!IsSaneCount (count))
return null;
uint index_size = 0x30 * (uint)count;
if (index_size > file.View.Reserve (0x10, index_size))
@ -80,25 +80,25 @@ namespace GameRes.Formats.SystemEpsylon
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pentry = entry as PackDatEntry;
if (null == pentry || 0 == (pentry.Flags & 0x10000))
if (null == pentry || entry.Size < 4 || 0 == (pentry.Flags & 0x10000))
return arc.File.CreateStream (entry.Offset, entry.Size);
byte[] input = new byte[pentry.Size];
if (pentry.Size != arc.File.View.Read (entry.Offset, input, 0, pentry.Size))
return arc.File.CreateStream (entry.Offset, entry.Size);
unsafe
var input = arc.File.View.ReadBytes (entry.Offset, pentry.Size);
if (input.Length == pentry.Size)
{
fixed (byte* buf_raw = input)
unsafe
{
uint* encoded = (uint*)buf_raw;
uint key = pentry.Size >> 2;
key = (key << (((int)key & 7) + 8)) ^ key;
for (uint i = entry.Size / 4; i != 0; --i )
fixed (byte* buf_raw = input)
{
*encoded ^= key;
int cl = (int)(*encoded++ % 24);
key = (key << cl) | (key >> (32 - cl));
uint* encoded = (uint*)buf_raw;
uint key = pentry.Size >> 2;
key = (key << (((int)key & 7) + 8)) ^ key;
for (uint i = entry.Size / 4; i != 0; --i )
{
*encoded ^= key;
int cl = (int)(*encoded++ % 24);
key = Binary.RotL (key, cl);
}
}
}
}