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315 lines
12 KiB
C#
315 lines
12 KiB
C#
//! \file ArcSec5.cs
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//! \date Fri Oct 23 18:10:06 2015
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//! \brief Sas5 engine resource index file.
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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 GameRes.Utility;
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using System.Text;
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namespace GameRes.Formats.Sas5
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{
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[Export(typeof(ArchiveFormat))]
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public class Sec5Opener : ArchiveFormat
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{
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public override string Tag { get { return "SEC5"; } }
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public override string Description { get { return "SAS5 engine resource index file"; } }
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public override uint Signature { get { return 0x35434553; } } // 'SEC5'
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public override bool IsHierarchic { get { return false; } }
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public override bool CanCreate { get { return false; } }
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public override ArcFile TryOpen (ArcView file)
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{
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uint offset = 8;
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var dir = new List<Entry>();
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while (offset < file.MaxOffset)
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{
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string name = file.View.ReadString (offset, 4, Encoding.ASCII);
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if ("ENDS" == name)
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break;
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uint section_size = file.View.ReadUInt32 (offset+4);
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offset += 8;
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var entry = new Entry {
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Name = name,
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Offset = offset,
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Size = section_size,
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};
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dir.Add (entry);
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offset += section_size;
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}
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if (dir.Count > 0)
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return new ArcFile (file, this, dir);
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return null;
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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if ("CODE" != entry.Name)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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var code = new byte[entry.Size];
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arc.File.View.Read (entry.Offset, code, 0, entry.Size);
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DecryptCodeSection (code);
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return new MemoryStream (code);
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}
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static void DecryptCodeSection (byte[] code)
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{
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byte key = 0;
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for (int i = 0; i < code.Length; ++i)
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{
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int x = code[i] + 18;
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code[i] ^= key;
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key += (byte)x;
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}
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}
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static internal Dictionary<string, Dictionary<int, Entry>> CurrentIndex;
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static internal Dictionary<int, Entry> LookupIndex (string filename)
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{
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if (null == CurrentIndex)
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CurrentIndex = FindSec5Resr (filename);
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if (null == CurrentIndex)
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return null;
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Dictionary<int, Entry> arc_map = null;
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CurrentIndex.TryGetValue (Path.GetFileName (filename), out arc_map);
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return arc_map;
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}
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static internal Dictionary<string, Dictionary<int, Entry>> FindSec5Resr (string arc_name)
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{
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string dir_name = Path.GetDirectoryName (arc_name);
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var match = Directory.GetFiles (dir_name, "*.sec5");
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if (0 == match.Length)
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{
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string parent = Path.GetDirectoryName (dir_name);
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if (!string.IsNullOrEmpty (parent))
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match = Directory.GetFiles (parent, "*.sec5");
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}
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if (0 == match.Length)
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return null;
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using (var sec5 = new ArcView (match[0]))
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{
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if (!sec5.View.AsciiEqual (0, "SEC5"))
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return null;
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uint offset = 8;
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while (offset < sec5.MaxOffset)
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{
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string id = sec5.View.ReadString (offset, 4, Encoding.ASCII);
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if ("ENDS" == id)
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break;
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uint section_size = sec5.View.ReadUInt32 (offset+4);
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offset += 8;
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if ("RESR" == id)
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{
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using (var resr = sec5.CreateStream (offset, section_size))
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return ReadResrSection (resr);
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}
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if ("RES2" == id)
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{
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using (var res2 = sec5.CreateStream (offset, section_size))
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return ReadRes2Section (res2);
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}
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offset += section_size;
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}
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}
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return null;
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}
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static internal Dictionary<string, Dictionary<int, Entry>> ReadResrSection (Stream input)
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{
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using (var resr = new BinaryReader (input, Encodings.cp932, true))
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{
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int count = resr.ReadInt32();
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if (0 == count)
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return null;
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var map = new Dictionary<string, Dictionary<int, Entry>> (StringComparer.InvariantCultureIgnoreCase);
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for (int i = 0; i < count; ++i)
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{
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string name = resr.BaseStream.ReadCString();
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string type = resr.BaseStream.ReadCString();
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string arc_type = resr.BaseStream.ReadCString();
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int res_length = resr.ReadInt32();
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var next_pos = resr.BaseStream.Position + res_length;
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if (arc_type == "file-war" || arc_type == "file-iar")
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{
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string arc_name = resr.BaseStream.ReadCString();
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int id = resr.ReadInt32();
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var base_arc_name = Path.GetFileName (arc_name);
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if (!map.ContainsKey (base_arc_name))
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map[base_arc_name] = new Dictionary<int, Entry>();
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var entry = new Entry
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{
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Name = name,
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Type = type,
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};
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map[base_arc_name][id] = entry;
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}
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resr.BaseStream.Position = next_pos;
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}
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return map.Count > 0 ? map : null;
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}
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}
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static internal Dictionary<string, Dictionary<int, Entry>> ReadRes2Section (Stream input)
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{
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using (var resr = new Res2Reader (input))
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return resr.Read();
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}
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}
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internal sealed class Res2Reader : IDisposable
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{
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BinaryReader m_resr;
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byte[] m_strings;
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Dictionary<int, string> m_string_cache = new Dictionary<int, string>();
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public Res2Reader (Stream input)
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{
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m_resr = new BinaryReader (input, Encodings.cp932, true);
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}
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public Dictionary<string, Dictionary<int, Entry>> Read ()
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{
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int section_size = m_resr.ReadInt32();
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m_strings = m_resr.ReadBytes (section_size);
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if (m_strings.Length != section_size)
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return null;
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var map = new Dictionary<string, Dictionary<int, Entry>> (StringComparer.InvariantCultureIgnoreCase);
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int count = m_resr.ReadInt32();
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for (int i = 0; i < count; ++i)
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{
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string name = ReadString();
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string type = ReadString();
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string arc_type = ReadString();
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int param_count = ReadInteger();
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string arc_name = null;
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int? arc_index = null;
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for (int j = 0; j < param_count; ++j)
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{
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string param_name = ReadString();
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if ("path" == param_name)
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arc_name = ReadString();
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else if ("arc-index" == param_name)
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arc_index = ReadInteger();
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else
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SkipObject();
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}
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if (!string.IsNullOrEmpty (arc_name) && arc_index != null)
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{
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arc_name = Path.GetFileName (arc_name);
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if (!map.ContainsKey (arc_name))
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map[arc_name] = new Dictionary<int, Entry>();
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var entry = new Entry
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{
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Name = name,
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Type = type,
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};
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map[arc_name][arc_index.Value] = entry;
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}
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}
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return map.Count > 0 ? map : null;
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}
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string ReadString ()
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{
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int n = m_resr.ReadByte();
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if (0x90 != (n & 0xF8))
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throw new InvalidFormatException ("[ReadString] SEC5 deserialization error");
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int offset = ReadNumber (n);
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if (offset >= m_strings.Length)
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throw new InvalidFormatException ("[ReadString] SEC5 deserialization error");
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string s;
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if (!m_string_cache.TryGetValue (offset, out s))
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{
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int str_length = LittleEndian.ToInt32 (m_strings, offset);
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s = Encodings.cp932.GetString (m_strings, offset+4, str_length);
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m_string_cache[offset] = s;
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}
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return s;
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}
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int ReadInteger ()
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{
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int n = m_resr.ReadByte();
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if (0 != (n & 0xE0))
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{
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if (0x80 != (n & 0xF8))
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throw new InvalidFormatException ("[ReadInteger] SEC5 deserialization error");
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n = ReadNumber (n);
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}
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else
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{
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n = (n & 0xF) - (n & 0x10);
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}
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return n;
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}
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void SkipObject ()
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{
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int n = m_resr.ReadByte();
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if (0 != (n & 0xE0))
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ReadNumber (n);
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}
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int ReadNumber (int length_code)
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{
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int count = (length_code & 7) + 1;
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if (count > 4)
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throw new InvalidFormatException ("[ReadNumber] SEC5 deserialization error");
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int n = 0;
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int rank = 0;
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for (int i = 0; i < count; ++i)
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{
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int b = m_resr.ReadByte();
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n |= b << rank;
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rank += 8;
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}
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if (count <= 3)
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{
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int sign = n & (1 << (8 * count - 1));
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if (sign != 0)
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n -= sign << 1;
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}
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return n;
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}
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#region IDisposable Members
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bool _disposed = false;
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public void Dispose ()
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{
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if (!_disposed)
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{
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m_resr.Dispose();
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_disposed = true;
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}
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}
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#endregion
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}
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}
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