GARbro-mirror/ArcFormats/ArcISA.cs

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//! \file ArcISA.cs
//! \date Tue Mar 17 09:21:03 2015
//! \brief ISM engine resource archive.
//
// Copyright (C) 2015-2018 by morkt
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//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System.Collections.Generic;
using System.ComponentModel.Composition;
namespace GameRes.Formats.ISM
{
[Export(typeof(ArchiveFormat))]
public class IsaOpener : ArchiveFormat
{
public override string Tag { get { return "ISA"; } }
public override string Description { get { return "ISM engine resource archive"; } }
public override uint Signature { get { return 0x204d5349; } } // 'ISM '
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
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public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (4, "ARCHIVED"))
return null;
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int count = file.View.ReadInt16 (0x0C);
if (!IsSaneCount (count))
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return null;
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int version = file.View.ReadUInt16 (0x0E);
bool is_encrypted = (version & 0x8000) != 0;
version &= 0x7FFF;
var reader = new IsaIndexReader (file, count);
List<Entry> dir = null;
if (version != 1)
dir = reader.ReadIndex (0x0C, 0x14);
if (null == dir)
dir = reader.ReadIndex (0x30, 0x10);
if (null == dir)
return null;
return new ArcFile (file, this, dir);
}
}
internal class IsaIndexReader
{
ArcView m_file;
List<Entry> m_dir;
int m_count;
public IsaIndexReader (ArcView file, int count)
{
m_file = file;
m_dir = new List<Entry> (count);
m_count = count;
}
public List<Entry> ReadIndex (uint name_length, uint record_length)
{
m_dir.Clear();
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uint index_offset = 0x10;
for (int i = 0; i < m_count; ++i)
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{
var name = m_file.View.ReadString (index_offset, name_length);
if (0 == name.Length)
return null;
var entry = FormatCatalog.Instance.Create<Entry> (name);
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index_offset += name_length;
entry.Offset = m_file.View.ReadUInt32 (index_offset+4);
entry.Size = m_file.View.ReadUInt32 (index_offset+8);
if (!entry.CheckPlacement (m_file.MaxOffset))
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return null;
m_dir.Add (entry);
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index_offset += record_length;
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}
return m_dir;
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}
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unsafe void DecryptIndex (byte[] data)
{
int length = data.Length / 4;
if (0 == length)
return;
fixed (byte* data8 = data)
{
int* data32 = (int*)data8;
for (int i = 0; i < length; ++i)
{
data32[i] ^= ~(data.Length + length - i);
}
}
}
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}
}