mirror of
https://github.com/crskycode/GARbro.git
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217 lines
8.7 KiB
C#
217 lines
8.7 KiB
C#
//! \file ArcTactics.cs
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//! \date Thu Jul 23 16:27:55 2015
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//! \brief Tactics archive file implementation.
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//
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// Copyright (C) 2015 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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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 System.Linq;
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using System.Security.Cryptography;
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using GameRes.Compression;
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using GameRes.Utility;
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namespace GameRes.Formats.Tactics
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{
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internal class TacticsArcFile : ArcFile
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{
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public byte[] Password;
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public TacticsArcFile (ArcView file, ArchiveFormat format, ICollection<Entry> dir, byte[] pass)
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: base (file, format, dir)
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{
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Password = pass;
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class ArcOpener : ArchiveFormat
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{
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public override string Tag { get { return "ARC/Tactics"; } }
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public override string Description { get { return "Tactics archive file"; } }
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public override uint Signature { get { return 0x54434154; } } // 'TACT'
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public override bool IsHierarchic { get { return true; } }
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public override bool CanCreate { get { return false; } }
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public ArcOpener ()
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{
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Extensions = new string[] { "arc", "adf" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (!file.View.AsciiEqual (4, "ICS_ARC_FILE"))
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return null;
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var reader = new IndexReader (file);
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var dir = reader.ReadIndex();
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if (null == dir)
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return null;
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return new TacticsArcFile (file, this, dir, reader.Password);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var tarc = arc as TacticsArcFile;
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var tent = entry as PackedEntry;
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if (null == tarc || null == tarc.Password && !tent.IsPacked)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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if (null == tarc.Password)
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return new LzssStream (arc.File.CreateStream (entry.Offset, entry.Size));
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var data = new byte[entry.Size];
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arc.File.View.Read (entry.Offset, data, 0, entry.Size);
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int p = 0;
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for (int i = 0; i < data.Length; ++i)
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{
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data[i] ^= tarc.Password[p++];
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if (p == tarc.Password.Length)
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p = 0;
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}
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var input = new MemoryStream (data);
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if (null == tent || !tent.IsPacked)
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return input;
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return new LzssStream (input);
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}
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internal class IndexReader
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{
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ArcView m_file;
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uint m_packed_size;
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uint m_unpacked_size;
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int m_count;
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byte[] m_index;
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Lazy<List<Entry>> m_dir;
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public byte[] Password { get; private set; }
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public IndexReader (ArcView file)
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{
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m_file = file;
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m_packed_size = m_file.View.ReadUInt32 (0x10);
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m_unpacked_size = m_file.View.ReadUInt32 (0x14);
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m_count = m_file.View.ReadInt32 (0x18);
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m_dir = new Lazy<List<Entry>> (() => new List<Entry> (m_count));
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}
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public List<Entry> ReadIndex ()
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{
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if (!IsSaneCount (m_count) || m_packed_size+0x20L > m_file.MaxOffset)
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return null;
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m_index = new byte[m_unpacked_size];
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using (var input = m_file.CreateStream (0x20, m_packed_size))
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{
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try
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{
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if (ReadV0 (input))
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return m_dir.Value;
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}
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catch { /* ignore V0 parse errors, try V1 */ }
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if (m_dir.IsValueCreated)
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m_dir.Value.Clear();
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input.Position = 0;
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if (ReadV1 (input))
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return m_dir.Value;
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return null;
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}
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}
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bool ReadV1 (Stream input)
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{
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// NOTE CryptoStream will close an input stream
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using (var xored = new CryptoStream (input, new NotTransform(), CryptoStreamMode.Read))
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using (var lzss = new LzssStream (xored))
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lzss.Read (m_index, 0, m_index.Length);
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int index_offset = Array.IndexOf (m_index, (byte)0);
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if (-1 == index_offset || 0 == index_offset)
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return false;
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Password = m_index.Take (index_offset++).ToArray();
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long base_offset = 0x20 + m_packed_size;
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for (int i = 0; i < m_count; ++i)
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{
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var entry = new PackedEntry();
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entry.Offset = LittleEndian.ToUInt32 (m_index, index_offset) + base_offset;
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entry.Size = LittleEndian.ToUInt32 (m_index, index_offset + 4);
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entry.UnpackedSize = LittleEndian.ToUInt32 (m_index, index_offset + 8);
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entry.IsPacked = entry.UnpackedSize != 0;
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if (!entry.CheckPlacement (m_file.MaxOffset))
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return false;
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int name_len = LittleEndian.ToInt32 (m_index, index_offset + 0xC);
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entry.Name = Encodings.cp932.GetString (m_index, index_offset+0x18, name_len);
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entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
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m_dir.Value.Add (entry);
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index_offset += 0x18 + name_len;
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}
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return true;
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}
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bool ReadV0 (Stream input)
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{
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long current_offset = 0x20 + m_packed_size;
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uint offset_table_size = (uint)m_count * 0x10;
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if (offset_table_size > m_file.View.Reserve (current_offset, offset_table_size))
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return false;
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using (var lzss = new LzssStream (input, LzssMode.Decompress, true))
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lzss.Read (m_index, 0, m_index.Length);
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for (int i = 0; i < m_index.Length; ++i)
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{
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m_index[i] = (byte)(~m_index[i] - 5);
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}
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int index_offset = Array.IndexOf (m_index, (byte)0);
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if (-1 == index_offset || 0 == index_offset)
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return false;
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index_offset++;
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// Password = m_index.Take (index_offset++).ToArray();
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for (int i = 0; i < m_count && index_offset < m_index.Length; ++i)
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{
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int name_end = Array.IndexOf (m_index, (byte)0, index_offset);
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if (-1 == name_end)
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name_end = m_index.Length;
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if (index_offset == name_end)
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return false;
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var entry = new PackedEntry();
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entry.Offset = m_file.View.ReadUInt32 (current_offset);
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entry.Size = m_file.View.ReadUInt32 (current_offset+4);
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entry.UnpackedSize = m_file.View.ReadUInt32 (current_offset+8);
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entry.IsPacked = entry.UnpackedSize != 0;
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if (!entry.CheckPlacement (m_file.MaxOffset))
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return false;
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entry.Name = Encodings.cp932.GetString (m_index, index_offset, name_end-index_offset);
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entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
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m_dir.Value.Add (entry);
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index_offset = name_end+1;
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current_offset += 0x10;
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}
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return true;
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}
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}
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}
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}
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