GARbro-mirror/ArcFormats/ArcTactics.cs

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//! \file ArcTactics.cs
//! \date Thu Jul 23 16:27:55 2015
//! \brief Tactics archive file implementation.
//
// 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;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using GameRes.Compression;
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using GameRes.Utility;
namespace GameRes.Formats.Tactics
{
internal class TacticsArcFile : ArcFile
{
public byte[] Password;
public TacticsArcFile (ArcView file, ArchiveFormat format, ICollection<Entry> dir, byte[] pass)
: base (file, format, dir)
{
Password = pass;
}
}
[Export(typeof(ArchiveFormat))]
public class ArcOpener : ArchiveFormat
{
public override string Tag { get { return "ARC/Tactics"; } }
public override string Description { get { return "Tactics archive file"; } }
public override uint Signature { get { return 0x54434154; } } // 'TACT'
public override bool IsHierarchic { get { return true; } }
public override bool CanCreate { get { return false; } }
public ArcOpener ()
{
Extensions = new string[] { "arc", "adf" };
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}
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (4, "ICS_ARC_FILE"))
return null;
var reader = new IndexReader (file);
var dir = reader.ReadIndex();
if (null == dir)
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return null;
return new TacticsArcFile (file, this, dir, reader.Password);
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}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var tarc = arc as TacticsArcFile;
var tent = entry as PackedEntry;
if (null == tarc || null == tarc.Password && !tent.IsPacked)
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return arc.File.CreateStream (entry.Offset, entry.Size);
if (null == tarc.Password)
return new LzssStream (arc.File.CreateStream (entry.Offset, entry.Size));
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var data = new byte[entry.Size];
arc.File.View.Read (entry.Offset, data, 0, entry.Size);
int p = 0;
for (int i = 0; i < data.Length; ++i)
{
data[i] ^= tarc.Password[p++];
if (p == tarc.Password.Length)
p = 0;
}
var input = new MemoryStream (data);
if (null == tent || !tent.IsPacked)
return input;
return new LzssStream (input);
}
internal class IndexReader
{
ArcView m_file;
uint m_packed_size;
uint m_unpacked_size;
int m_count;
byte[] m_index;
Lazy<List<Entry>> m_dir;
public byte[] Password { get; private set; }
public IndexReader (ArcView file)
{
m_file = file;
m_packed_size = m_file.View.ReadUInt32 (0x10);
m_unpacked_size = m_file.View.ReadUInt32 (0x14);
m_count = m_file.View.ReadInt32 (0x18);
m_dir = new Lazy<List<Entry>> (() => new List<Entry> (m_count));
}
public List<Entry> ReadIndex ()
{
if (!IsSaneCount (m_count) || m_packed_size+0x20L > m_file.MaxOffset)
return null;
m_index = new byte[m_unpacked_size];
using (var input = m_file.CreateStream (0x20, m_packed_size))
{
try
{
if (ReadV0 (input))
return m_dir.Value;
}
catch { /* ignore V0 parse errors, try V1 */ }
input.Position = 0;
if (ReadV1 (input))
return m_dir.Value;
return null;
}
}
bool ReadV1 (Stream input)
{
// NOTE CryptoStream will close an input stream
using (var xored = new CryptoStream (input, new NotTransform(), CryptoStreamMode.Read))
using (var lzss = new LzssStream (xored))
lzss.Read (m_index, 0, m_index.Length);
int index_offset = Array.IndexOf (m_index, (byte)0);
if (-1 == index_offset || 0 == index_offset)
return false;
Password = m_index.Take (index_offset++).ToArray();
long base_offset = 0x20 + m_packed_size;
for (int i = 0; i < m_count; ++i)
{
var entry = new PackedEntry();
entry.Offset = LittleEndian.ToUInt32 (m_index, index_offset) + base_offset;
entry.Size = LittleEndian.ToUInt32 (m_index, index_offset + 4);
entry.UnpackedSize = LittleEndian.ToUInt32 (m_index, index_offset + 8);
entry.IsPacked = entry.UnpackedSize != 0;
if (!entry.CheckPlacement (m_file.MaxOffset))
return false;
int name_len = LittleEndian.ToInt32 (m_index, index_offset + 0xC);
entry.Name = Encodings.cp932.GetString (m_index, index_offset+0x18, name_len);
entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
m_dir.Value.Add (entry);
index_offset += 0x18 + name_len;
}
return true;
}
bool ReadV0 (Stream input)
{
long current_offset = 0x20 + m_packed_size;
uint offset_table_size = (uint)m_count * 0x10;
if (offset_table_size > m_file.View.Reserve (current_offset, offset_table_size))
return false;
using (var lzss = new LzssStream (input, LzssMode.Decompress, true))
lzss.Read (m_index, 0, m_index.Length);
for (int i = 0; i < m_index.Length; ++i)
{
m_index[i] = (byte)(~m_index[i] - 5);
}
int index_offset = Array.IndexOf (m_index, (byte)0);
if (-1 == index_offset || 0 == index_offset)
return false;
index_offset++;
// Password = m_index.Take (index_offset++).ToArray();
for (int i = 0; i < m_count && index_offset < m_index.Length; ++i)
{
int name_end = Array.IndexOf (m_index, (byte)0, index_offset);
if (-1 == name_end)
name_end = m_index.Length;
if (index_offset == name_end)
return false;
var entry = new PackedEntry();
entry.Offset = m_file.View.ReadUInt32 (current_offset);
entry.Size = m_file.View.ReadUInt32 (current_offset+4);
entry.UnpackedSize = m_file.View.ReadUInt32 (current_offset+8);
entry.IsPacked = entry.UnpackedSize != 0;
if (!entry.CheckPlacement (m_file.MaxOffset))
return false;
entry.Name = Encodings.cp932.GetString (m_index, index_offset, name_end-index_offset);
entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
m_dir.Value.Add (entry);
index_offset = name_end+1;
current_offset += 0x10;
}
return true;
}
}
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}
}