GARbro-mirror/ArcFormats/Escude/ArcBIN.cs
morkt bf676b9198 (ReadIndexV2): use Binary.GetCString instead of ArcView.ReadString.
temporary buffer allocation within ArcView.ReadString makes reading of
large indices (20000+ entries) somewhat slow.
2015-12-23 09:42:08 +04:00

153 lines
5.7 KiB
C#

//! \file ArcBIN.cs
//! \date Sat Dec 19 06:16:35 2015
//! \brief Escu:de resource archives.
//
// Copyright (C) 2015 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
// 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;
using GameRes.Utility;
namespace GameRes.Formats.Escude
{
[Export(typeof(ArchiveFormat))]
public class BinOpener : FVP.BinOpener
{
public override string Tag { get { return "BIN/ESC-ARC"; } }
public override string Description { get { return "Escu:de resource archive"; } }
public override uint Signature { get { return 0x2D435345; } } // 'ESC-'
public override bool IsHierarchic { get { return true; } }
public override bool CanCreate { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (4, "ARC"))
return null;
int version = file.View.ReadByte (7) - '0';
var reader = new IndexReader (file);
List<Entry> dir = null;
if (1 == version)
dir = reader.ReadIndexV1();
else if (2 == version)
dir = reader.ReadIndexV2();
if (null == dir)
return null;
return new ArcFile (file, this, dir);
}
}
internal sealed class IndexReader
{
ArcView m_file;
uint m_seed;
uint m_count;
public IndexReader (ArcView file)
{
m_file = file;
m_seed = m_file.View.ReadUInt32 (8);
m_count = file.View.ReadUInt32 (0xC) ^ NextKey();
}
public List<Entry> ReadIndexV1 ()
{
if (!ArchiveFormat.IsSaneCount ((int)m_count))
return null;
uint index_size = m_count * 0x88;
var index = m_file.View.ReadBytes (0x10, index_size);
if (index.Length != index_size)
return null;
Decrypt (index);
int index_offset = 0;
var dir = new List<Entry> ((int)m_count);
for (uint i = 0; i < m_count; ++i)
{
var name = Binary.GetCString (index, index_offset, 0x80);
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = LittleEndian.ToUInt32 (index, index_offset+0x80);
entry.Size = LittleEndian.ToUInt32 (index, index_offset+0x84);
if (!entry.CheckPlacement (m_file.MaxOffset))
return null;
index_offset += 0x88;
dir.Add (entry);
}
return dir;
}
public List<Entry> ReadIndexV2 ()
{
if (!ArchiveFormat.IsSaneCount ((int)m_count))
return null;
uint names_size = m_file.View.ReadUInt32 (0x10) ^ NextKey();
uint index_size = m_count * 12;
var index = m_file.View.ReadBytes (0x14, index_size);
if (index.Length != index_size)
return null;
uint filenames_base = 0x14 + index_size;
var names = m_file.View.ReadBytes (filenames_base, names_size);
if (names.Length != names_size)
return null;
Decrypt (index);
int index_offset = 0;
var dir = new List<Entry> ((int)m_count);
for (uint i = 0; i < m_count; ++i)
{
int filename_offset = LittleEndian.ToInt32 (index, index_offset);
if (filename_offset < 0 || filename_offset >= names.Length)
return null;
var name = Binary.GetCString (names, filename_offset, names.Length-filename_offset);
if (0 == name.Length)
return null;
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = LittleEndian.ToUInt32 (index, index_offset+4);
entry.Size = LittleEndian.ToUInt32 (index, index_offset+8);
if (!entry.CheckPlacement (m_file.MaxOffset))
return null;
index_offset += 12;
dir.Add (entry);
}
return dir;
}
unsafe void Decrypt (byte[] data)
{
fixed (byte* raw = data)
{
uint* data32 = (uint*)raw;
for (int i = data.Length/4; i > 0; --i)
{
*data32++ ^= NextKey();
}
}
}
uint NextKey ()
{
m_seed ^= 0x65AC9365;
m_seed ^= (((m_seed >> 1) ^ m_seed) >> 3)
^ (((m_seed << 1) ^ m_seed) << 3);
return m_seed;
}
}
}