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199 lines
7.4 KiB
C#
199 lines
7.4 KiB
C#
//! \file ArcAi5Win.cs
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//! \date Mon Jun 29 04:41:29 2015
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//! \brief Ai5Win engine resource archive.
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//
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// Copyright (C) 2015-2018 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 GameRes.Compression;
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using GameRes.Utility;
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namespace GameRes.Formats.Elf
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{
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[Serializable]
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public class ArcIndexScheme
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{
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public int NameLength;
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public byte NameKey;
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public uint SizeKey;
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public uint OffsetKey;
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}
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[Serializable]
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public class Ai5Scheme : ResourceScheme
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{
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public Dictionary<string, ArcIndexScheme> KnownSchemes;
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}
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[Export(typeof(ArchiveFormat))]
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[ExportMetadata("Priority", -1)]
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public class ArcAI5Opener : ArchiveFormat
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{
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public override string Tag { get { return "ARC/AI5WIN"; } }
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public override string Description { get { return "AI5WIN engine resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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static Ai5Scheme DefaultScheme = new Ai5Scheme { KnownSchemes = new Dictionary<string, ArcIndexScheme>() };
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public Dictionary<string, ArcIndexScheme> KnownSchemes { get { return DefaultScheme.KnownSchemes; } }
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public override ResourceScheme Scheme
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{
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get { return DefaultScheme; }
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set { DefaultScheme = (Ai5Scheme)value; }
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (0 == KnownSchemes.Count)
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return null;
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int count = file.View.ReadInt32 (0);
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if (!IsSaneCount (count))
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return null;
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var reader = new Ai5ArcIndexReader (file, count);
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var dir = reader.TrySchemes (KnownSchemes.Values);
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if (null == dir)
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dir = reader.TrySchemes (reader.GuessSchemes());
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if (null == dir)
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return null;
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return new ArcFile (file, this, dir);
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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 input = arc.File.CreateStream (entry.Offset, entry.Size);
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if (entry.Name.HasAnyOfExtensions ("mes", "lib", "a", "a6", "msk", "x"))
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return new LzssStream (input);
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return input;
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}
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}
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internal class Ai5ArcIndexReader
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{
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protected ArcView m_file;
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protected int m_count;
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protected List<Entry> m_dir;
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protected byte[] m_name_buf = new byte[0x100];
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public Ai5ArcIndexReader (ArcView file, int count)
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{
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m_file = file;
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m_count = count;
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m_dir = new List<Entry> (m_count);
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}
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public List<Entry> TrySchemes (IEnumerable<ArcIndexScheme> schemes)
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{
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foreach (var scheme in schemes)
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{
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try
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{
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var dir = Read (scheme);
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if (dir != null)
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return dir;
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}
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catch { /* ignore parse errors */ }
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}
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return null;
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}
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public List<Entry> Read (ArcIndexScheme scheme)
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{
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if (scheme.NameLength > m_name_buf.Length)
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m_name_buf = new byte[scheme.NameLength];
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m_dir.Clear();
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int index_offset = 4;
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uint index_size = (uint)(m_count * (scheme.NameLength + 8));
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if (index_size > m_file.View.Reserve (index_offset, index_size))
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return null;
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for (int i = 0; i < m_count; ++i)
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{
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m_file.View.Read (index_offset, m_name_buf, 0, (uint)scheme.NameLength);
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string name = DecryptName (scheme);
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if (string.IsNullOrWhiteSpace (name))
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return null;
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index_offset += scheme.NameLength;
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Size = m_file.View.ReadUInt32 (index_offset) ^ scheme.SizeKey;
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entry.Offset = m_file.View.ReadUInt32 (index_offset+4) ^ scheme.OffsetKey;
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if (entry.Offset < index_size+4 || !entry.CheckPlacement (m_file.MaxOffset))
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return null;
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m_dir.Add (entry);
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index_offset += 8;
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}
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return m_dir;
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}
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internal string DecryptName (ArcIndexScheme scheme)
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{
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int n;
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for (n = 0; n < m_name_buf.Length; ++n)
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{
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if (n > scheme.NameLength)
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return null;
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m_name_buf[n] ^= scheme.NameKey;
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if (0 == m_name_buf[n])
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break;
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if (m_name_buf[n] < 0x20)
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return null;
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}
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if (n != 0)
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return Encodings.cp932.GetString (m_name_buf, 0, n);
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else
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return null;
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}
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internal IEnumerable<ArcIndexScheme> GuessSchemes ()
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{
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if (m_count < 2)
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yield break;
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foreach (int name_length in NameLengths)
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{
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uint data_offset = (uint)((name_length + 8) * m_count + 4);
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byte name_key = m_file.View.ReadByte (3 + name_length);
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uint first_size = m_file.View.ReadUInt32 (4 + name_length);
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uint first_offset = m_file.View.ReadUInt32 (8 + name_length);
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uint offset_key = data_offset ^ first_offset;
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uint second_offset = m_file.View.ReadUInt32 ((name_length+8) * 2) ^ offset_key;
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if (second_offset < data_offset || second_offset >= m_file.MaxOffset)
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continue;
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uint size_key = (second_offset - data_offset) ^ first_size;
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if (0 == offset_key || 0 == size_key)
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continue;
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yield return new ArcIndexScheme {
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NameLength = name_length,
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NameKey = name_key,
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SizeKey = size_key,
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OffsetKey = offset_key,
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};
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}
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}
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static readonly int[] NameLengths = { 0x14, 0x1E, 0x20, 0x100 };
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}
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}
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