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340 lines
13 KiB
C#
340 lines
13 KiB
C#
//! \file ArcTCD3.cs
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//! \date Thu Oct 08 13:14:57 2015
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//! \brief TopCat data archives (TCD)
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//
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// Copyright (C) 2015-2016 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.Utility;
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namespace GameRes.Formats.TopCat
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{
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internal class TcdSection
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{
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public uint DataSize;
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public uint IndexOffset;
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public int DirCount;
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public int DirNameLength;
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public int FileCount;
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public int FileNameLength;
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}
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internal struct TcdDirEntry
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{
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public int FileCount;
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public int NamesOffset;
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public int FirstIndex;
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}
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internal class TcdEntry : AutoEntry
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{
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public int Index;
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public TcdEntry (int index, string name, ArcView file, long offset)
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: base (name, () => DetectFileType (file, offset))
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{
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Index = index;
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Offset = offset;
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}
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static readonly Lazy<ImageFormat> SpdcFormat = new Lazy<ImageFormat> (() => ImageFormat.FindByTag ("SPD"));
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private static IResource DetectFileType (ArcView file, long offset)
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{
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uint signature = file.View.ReadUInt32 (offset);
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byte spdc_key = (byte)(signature - 'S');
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if ('P' == (((signature >> 8) - spdc_key) & 0xFF) &&
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'D' == (((signature >> 16) - spdc_key) & 0xFF) &&
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'C' == (((signature >> 24) - spdc_key) & 0xFF))
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return SpdcFormat.Value;
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return AutoEntry.DetectFileType (signature);
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}
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}
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internal class TcdArchive : ArcFile
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{
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public int? Key;
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public TcdArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir)
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: base (arc, impl, dir)
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{
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}
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}
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[Serializable]
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public class TcdScheme : ResourceScheme
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{
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public Dictionary<string, int> KnownKeys;
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}
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[Export(typeof(ArchiveFormat))]
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public class TcdOpener : ArchiveFormat
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{
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public override string Tag { get { return "TCD3"; } }
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public override string Description { get { return "TopCat data archive"; } }
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public override uint Signature { get { return 0x33444354; } } // 'TCD3'
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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 TcdOpener ()
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{
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Extensions = new string[] { "tcd" };
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}
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public static Dictionary<string, int> KnownKeys = new Dictionary<string, int>();
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public override ResourceScheme Scheme
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{
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get { return new TcdScheme { KnownKeys = KnownKeys }; }
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set { KnownKeys = ((TcdScheme)value).KnownKeys; }
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}
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public override ArcFile TryOpen (ArcView file)
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{
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int count = file.View.ReadInt32 (4);
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if (!IsSaneCount (count))
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return null;
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uint current_offset = 8;
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var sections = new List<TcdSection> (5);
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for (int i = 0; i < 5; ++i, current_offset += 0x20)
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{
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uint index_offset = file.View.ReadUInt32 (current_offset+4);
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if (0 == index_offset)
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continue;
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var section = new TcdSection
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{
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IndexOffset = index_offset,
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DataSize = file.View.ReadUInt32 (current_offset),
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DirCount = file.View.ReadInt32 (current_offset+8),
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DirNameLength = file.View.ReadInt32 (current_offset+0x0C),
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FileCount = file.View.ReadInt32 (current_offset+0x10),
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FileNameLength = file.View.ReadInt32 (current_offset+0x14),
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};
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sections.Add (section);
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}
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var list = new List<Entry> (count);
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foreach (var section in sections)
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{
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current_offset = section.IndexOffset;
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uint dir_size = (uint)(section.DirCount * section.DirNameLength);
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var dir_names = new byte[dir_size];
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if (dir_size != file.View.Read (current_offset, dir_names, 0, dir_size))
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return null;
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current_offset += dir_size;
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DecryptNames (dir_names, section.DirNameLength);
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var dirs = new TcdDirEntry[section.DirCount];
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for (int i = 0; i < dirs.Length; ++i)
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{
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dirs[i].FileCount = file.View.ReadInt32 (current_offset);
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dirs[i].NamesOffset = file.View.ReadInt32 (current_offset+4);
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dirs[i].FirstIndex = file.View.ReadInt32 (current_offset+8);
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current_offset += 0x10;
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}
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uint entries_size = (uint)(section.FileCount * section.FileNameLength);
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var file_names = new byte[entries_size];
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if (entries_size != file.View.Read (current_offset, file_names, 0, entries_size))
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return null;
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current_offset += entries_size;
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DecryptNames (file_names, section.FileNameLength);
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var offsets = new uint[section.FileCount + 1];
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for (int i = 0; i < offsets.Length; ++i)
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{
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offsets[i] = file.View.ReadUInt32 (current_offset);
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current_offset += 4;
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}
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int dir_name_offset = 0;
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foreach (var dir in dirs)
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{
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string dir_name = Binary.GetCString (dir_names, dir_name_offset, section.DirNameLength);
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dir_name_offset += section.DirNameLength;
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int index = dir.FirstIndex;
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int name_offset = dir.NamesOffset;
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for (int i = 0; i < dir.FileCount; ++i)
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{
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string name = Binary.GetCString (file_names, name_offset, section.FileNameLength);
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name_offset += section.FileNameLength;
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name = dir_name + '\\' + name;
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var entry = new TcdEntry (index, name, file, offsets[index]);
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entry.Size = offsets[index+1] - offsets[index];
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++index;
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list.Add (entry);
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}
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}
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}
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return new TcdArchive (file, this, list);
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}
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private void DecryptNames (byte[] buffer, int name_length)
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{
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byte key = buffer[name_length-1];
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for (int i = 0; i < buffer.Length; ++i)
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buffer[i] -= key;
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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 tcde = entry as TcdEntry;
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var tcda = arc as TcdArchive;
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if (null == tcde || null == tcda || entry.Size <= 0x14)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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int signature = arc.File.View.ReadInt32 (entry.Offset);
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if (0x43445053 == signature) // 'SPDC'
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return arc.File.CreateStream (entry.Offset, entry.Size);
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if (0x5367674F == signature) // 'OggS'
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return RestoreOggStream (arc, entry);
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var header = new byte[0x14];
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arc.File.View.Read (entry.Offset, header, 0, 0x14);
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byte header_key = (byte)(header[0x12] + header[0x10]);
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header[0] -= header_key;
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header[1] -= header_key;
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header[2] -= header_key;
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header[3] -= header_key;
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bool spdc_entry = Binary.AsciiEqual (header, "SPDC");
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if (!spdc_entry)
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{
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LittleEndian.Pack (signature, header, 0);
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if (null == tcda.Key)
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{
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foreach (var key in KnownKeys.Values)
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{
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int first = signature + key * (tcde.Index + 3);
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if (0x43445053 == first) // 'SPDC'
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{
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tcda.Key = key;
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spdc_entry = true;
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break;
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}
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}
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}
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else if (0x43445053 == signature + tcda.Key.Value * (tcde.Index + 3))
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{
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spdc_entry = true;
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}
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if (spdc_entry && 0 != tcda.Key.Value)
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{
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unsafe
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{
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fixed (byte* raw = header)
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{
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int* dw = (int*)raw;
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for (int i = 0; i < 5; ++i)
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dw[i] += tcda.Key.Value * (tcde.Index + 3 + i);
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}
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}
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}
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if (!spdc_entry && entry.Name.StartsWith ("TXT\\", StringComparison.InvariantCultureIgnoreCase)
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&& signature > 0 && signature < 0x01000000)
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return OpenScript (tcda, tcde, signature);
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}
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var rest = arc.File.CreateStream (entry.Offset+0x14, entry.Size-0x14);
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return new PrefixStream (header, rest);
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}
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Stream OpenScript (TcdArchive arc, TcdEntry entry, int unpacked_size)
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{
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byte[] data = new byte[unpacked_size];
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using (var input = arc.File.CreateStream (entry.Offset+4, entry.Size-4))
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UnpackLz (input, data);
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DecryptScript (data);
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return new MemoryStream (data);
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}
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void UnpackLz (Stream input, byte[] output)
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{
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int dst = 0;
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int bits = 2;
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while (dst < output.Length)
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{
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bits >>= 1;
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if (1 == bits)
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{
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bits = input.ReadByte();
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if (-1 == bits)
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break;
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bits |= 0x100;
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}
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if (0 == (bits & 1))
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{
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int count = input.ReadByte();
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int offset = input.ReadByte() << 4 | count >> 4;
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count = Math.Min ((count & 0xF) + 3, output.Length - dst);
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Binary.CopyOverlapped (output, dst-offset, dst, count);
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dst += count;
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}
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else
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{
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output[dst++] = (byte)input.ReadByte();
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}
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}
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}
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void DecryptScript (byte[] data)
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{
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for (int i = 0; i < data.Length; ++i)
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data[i] = Binary.RotByteR (data[i], 1);
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}
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Stream RestoreOggStream (ArcFile arc, Entry entry)
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{
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var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
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int remaining = data.Length;
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int src = 0;
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while (remaining > 0x1B && Binary.AsciiEqual (data, src, "OggS"))
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{
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int segment_count = data[src+0x1A];
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data[src+0x16] = 0;
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data[src+0x17] = 0;
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data[src+0x18] = 0;
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data[src+0x19] = 0;
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int page_size = segment_count + 0x1B;
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if (segment_count != 0)
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{
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if (remaining < page_size)
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break;
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int segment_table = src + 0x1B;
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for (int i = 0; i < segment_count; ++i)
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page_size += data[segment_table++];
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}
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remaining -= page_size;
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if (remaining < 0)
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break;
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uint crc = Crc32Normal.UpdateCrc (0, data, src, page_size);
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LittleEndian.Pack (crc, data, src+0x16);
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src += page_size;
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}
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return new MemoryStream (data);
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}
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}
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}
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