mirror of
https://github.com/crskycode/GARbro.git
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261 lines
9.4 KiB
C#
261 lines
9.4 KiB
C#
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//! \file ArcEPK.cs
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//! \date Tue Sep 20 00:07:35 2016
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//! \brief TamaSoft resource archive.
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//
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// Copyright (C) 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.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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namespace GameRes.Formats.Tama
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{
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internal class EpkEntry : Entry
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{
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public int ArcNumber;
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}
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internal class EpkArchive : ArcFile
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{
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public readonly IReadOnlyList<ArcView> Parts;
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public EpkArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, IReadOnlyList<ArcView> parts)
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: base (arc, impl, dir)
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{
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Parts = parts;
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}
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bool _epk_disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (_epk_disposed)
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return;
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if (disposing)
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{
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foreach (var arc in Parts)
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arc.Dispose();
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}
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_epk_disposed = true;
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base.Dispose (disposing);
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class PakOpener : ArchiveFormat
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{
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public override string Tag { get { return "EPK"; } }
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public override string Description { get { return "TamaSoft ADV system resource archive"; } }
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public override uint Signature { get { return 0x204B5045; } } // 'EPK '
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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 override ArcFile TryOpen (ArcView file)
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{
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if (!file.View.AsciiEqual (0, "EPK "))
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return null;
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uint index_size = file.View.ReadUInt32 (4) - 0x20;
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int count = file.View.ReadInt32 (0x18);
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if (!IsSaneCount (count) || index_size >= file.MaxOffset)
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return null;
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uint index_offset = 0x20;
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if (index_size > file.View.Reserve (index_offset, index_size))
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return null;
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var arc_list = new List<Entry>();
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var arc_dir = VFS.GetDirectoryName (file.Name);
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var arc_name = Path.GetFileNameWithoutExtension (file.Name);
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for (int i = 1; i < 10; ++i)
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{
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var part_name = string.Format ("{0}.e{1:D02}", arc_name, i);
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part_name = VFS.CombinePath (arc_dir, part_name);
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if (!VFS.FileExists (part_name))
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break;
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arc_list.Add (VFS.FindFile (part_name));
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}
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var name_buffer = new byte[0x40];
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var dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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{
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uint name_offset = file.View.ReadUInt32 (index_offset+8);
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int name_length = file.View.ReadInt32 (name_offset);
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if (name_length <= 0 || name_length >= index_size)
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return null;
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if (name_length > name_buffer.Length)
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name_buffer = new byte[name_length];
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file.View.Read (name_offset+4, name_buffer, 0, (uint)name_length);
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for (int j = 0; j < name_length; ++j)
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name_buffer[j] ^= 0xFF;
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var name = Encodings.cp932.GetString (name_buffer, 0, name_length);
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var entry = FormatCatalog.Instance.Create<EpkEntry> (name);
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entry.Offset = file.View.ReadInt64 (index_offset+0x10);
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entry.Size = file.View.ReadUInt32 (index_offset+0x18);
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dir.Add (entry);
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index_offset += 0x28;
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}
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var arc_set = new List<ArcView> (arc_list.Count);
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try
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{
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long max_offset = file.MaxOffset;
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var bounds = new List<long> (arc_list.Count+1);
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bounds.Add (max_offset);
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foreach (var arc_entry in arc_list)
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{
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var arc_file = VFS.OpenView (arc_entry);
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arc_set.Add (arc_file);
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max_offset += arc_file.MaxOffset;
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bounds.Add (max_offset);
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}
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foreach (EpkEntry entry in dir)
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{
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if (!entry.CheckPlacement (max_offset))
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return null;
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entry.ArcNumber = bounds.FindIndex (x => x > entry.Offset);
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if (entry.ArcNumber > 0)
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entry.Offset -= bounds[entry.ArcNumber-1];
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}
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var arc = new EpkArchive (file, this, dir, arc_set);
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arc_set = null;
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return arc;
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}
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finally
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{
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if (arc_set != null)
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{
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foreach (var arc in arc_set)
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arc.Dispose();
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}
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}
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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 earc = arc as EpkArchive;
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var eent = entry as EpkEntry;
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if (null == earc || null == eent)
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return base.OpenEntry (arc, entry);
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long entry_offset = entry.Offset;
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ArcView file = arc.File;
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if (eent.ArcNumber > 0)
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file = earc.Parts[eent.ArcNumber-1];
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if (entry_offset + entry.Size <= file.MaxOffset)
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return file.CreateStream (entry_offset, entry.Size);
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uint first_part_size = (uint)(file.MaxOffset - entry_offset);
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var begin = file.CreateStream (entry_offset, first_part_size);
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var end = earc.Parts[eent.ArcNumber].CreateStream (0, entry.Size - first_part_size);
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return new ConcatStream (begin, end);
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}
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}
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/// <summary>
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/// Concatenation of the two input Streams.
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/// </summary>
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public class ConcatStream : InputProxyStream
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{
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Stream m_second;
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long m_position;
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Stream m_active;
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public ConcatStream (Stream first, Stream second) : base (first)
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{
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m_second = second;
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m_position = 0;
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m_active = first;
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}
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internal Stream First { get { return BaseStream; } }
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internal Stream Second { get { return m_second; } }
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public override bool CanSeek { get { return First.CanSeek && Second.CanSeek; } }
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public override long Length { get { return First.Length + Second.Length; } }
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public override long Position
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{
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get { return m_position; }
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set { m_position = value; }
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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if (First.CanSeek)
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{
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if (m_position >= First.Length)
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{
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m_active = Second;
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m_active.Position = m_position - First.Length;
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}
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else
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{
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m_active = First;
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m_active.Position = m_position;
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}
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}
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int total_read = 0;
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while (count > 0)
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{
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int read = m_active.Read (buffer, offset, count);
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if (0 == read)
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break;
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total_read += read;
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m_position += read;
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offset += read;
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count -= read;
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}
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if (count > 0 && m_active != Second)
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{
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m_active = Second;
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if (m_active.CanSeek)
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m_active.Position = 0;
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int read = m_active.Read (buffer, offset, count);
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m_position += read;
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total_read += read;
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}
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return total_read;
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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if (SeekOrigin.Begin == origin)
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Position = offset;
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else if (SeekOrigin.Current == origin)
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Position = m_position + offset;
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else
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Position = Length + offset;
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return m_position;
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}
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bool _disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (!_disposed)
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{
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if (disposing)
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m_second.Dispose();
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_disposed = true;
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base.Dispose (disposing);
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}
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}
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}
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}
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