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250 lines
8.8 KiB
C#
250 lines
8.8 KiB
C#
//! \file ArcKaguya.cs
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//! \date Mon Jun 01 07:03:03 2015
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//! \brief KaGuYa archive format.
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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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namespace GameRes.Formats.Kaguya
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{
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internal class AriEntry : PackedEntry
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{
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public ushort Mode;
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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 "ARI"; } }
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public override string Description { get { return "KaGuYa script engine resource archive"; } }
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public override uint Signature { get { return 0x314c4657; } } // 'WFL1'
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public override bool IsHierarchic { get { return true; } }
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public override bool CanWrite { get { return false; } }
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public ArcOpener ()
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{
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Extensions = new string[] { "arc" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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var reader = new IndexReader();
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var dir = reader.ReadIndex (file);
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if (null == dir || 0 == dir.Count)
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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 packed_entry = entry as PackedEntry;
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if (null == packed_entry || !packed_entry.IsPacked)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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if (0 == packed_entry.UnpackedSize)
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packed_entry.UnpackedSize = arc.File.View.ReadUInt32 (entry.Offset-4);
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using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
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using (var reader = new LzReader (input, entry.Size, packed_entry.UnpackedSize))
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{
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reader.Unpack();
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return new MemoryStream (reader.Data);
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}
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}
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}
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internal class IndexReader
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{
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byte[] m_name_buf = new byte[0x20];
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List<Entry> m_dir = new List<Entry>();
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public List<Entry> ReadIndex (ArcView file)
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{
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string ari_name = Path.ChangeExtension (file.Name, "ari");
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List<Entry> dir = null;
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if (file.Name != ari_name && VFS.FileExists (ari_name))
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dir = ReadAriIndex (file, ari_name);
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if (null == dir || 0 == dir.Count)
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dir = BuildIndex (file);
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return dir;
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}
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List<Entry> ReadAriIndex (ArcView file, string ari_name)
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{
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long arc_offset = 4;
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using (var ari = VFS.OpenView (ari_name))
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{
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long index_offset = 0;
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while (index_offset+4 < ari.MaxOffset)
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{
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int name_len = ari.View.ReadInt32 (index_offset);
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var name = ReadName (ari, index_offset+4, name_len);
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if (null == name)
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return null;
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var entry = new AriEntry { Name = name };
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index_offset += name_len + 4;
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entry.Mode = ari.View.ReadUInt16 (index_offset);
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entry.Size = ari.View.ReadUInt32 (index_offset+2);
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entry.UnpackedSize = 0;
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SetType (entry);
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index_offset += 6;
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arc_offset += name_len + 10;
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if (1 == entry.Mode)
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{
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entry.IsPacked = true;
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arc_offset += 4;
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}
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entry.Offset = arc_offset;
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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arc_offset += entry.Size;
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m_dir.Add (entry);
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}
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}
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return m_dir;
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}
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List<Entry> BuildIndex (ArcView file)
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{
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long arc_offset = 4;
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while (arc_offset+4 < file.MaxOffset)
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{
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int name_len = file.View.ReadInt32 (arc_offset);
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var name = ReadName (file, arc_offset+4, name_len);
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if (null == name)
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return null;
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var entry = new AriEntry { Name = name };
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arc_offset += name_len + 4;
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entry.Mode = file.View.ReadUInt16 (arc_offset);
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entry.Size = file.View.ReadUInt32 (arc_offset+2);
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SetType (entry);
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arc_offset += 6;
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if (1 == entry.Mode)
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{
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entry.IsPacked = true;
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entry.UnpackedSize = file.View.ReadUInt32 (arc_offset);
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arc_offset += 4;
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}
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entry.Offset = arc_offset;
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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arc_offset += entry.Size;
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m_dir.Add (entry);
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}
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return m_dir;
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}
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void SetType (AriEntry entry)
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{
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if (2 == entry.Mode)
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entry.Type = "audio";
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else if (1 == entry.Mode)
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entry.Type = "image";
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else
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entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
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}
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string ReadName (ArcView file, long offset, int name_len)
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{
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if (name_len <= 0 || offset+name_len+6 > file.MaxOffset || name_len > 0x100)
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return null;
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if (name_len > m_name_buf.Length)
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m_name_buf = new byte[name_len];
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file.View.Read (offset, m_name_buf, 0, (uint)name_len);
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return DecryptName (m_name_buf, name_len).TrimStart ('\\');
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}
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string DecryptName (byte[] name_buf, int name_len)
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{
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for (int i = 0; i < name_len; ++i)
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name_buf[i] ^= 0xff;
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return Encodings.cp932.GetString (name_buf, 0, name_len);
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}
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}
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internal sealed class LzReader : IDisposable, IDataUnpacker
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{
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MsbBitStream m_input;
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byte[] m_output;
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public byte[] Data { get { return m_output; } }
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public LzReader (Stream input, uint packed_size, uint unpacked_size)
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{
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m_input = new MsbBitStream (input, true);
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m_output = new byte[unpacked_size];
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}
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public void Unpack ()
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{
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int dst = 0;
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int frame_pos = 1;
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byte[] frame = new byte[4096];
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int frame_mask = frame.Length - 1;
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while (dst < m_output.Length)
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{
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int bit = m_input.GetNextBit();
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if (-1 == bit)
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break;
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if (0 != bit)
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{
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int data = m_input.GetBits (8);
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m_output[dst++] = (byte)data;
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frame[frame_pos++] = (byte)data;
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frame_pos &= frame_mask;
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}
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else
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{
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int win_offset = m_input.GetBits (12);
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if (-1 == win_offset || 0 == win_offset)
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break;
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int count = m_input.GetBits(4) + 2;
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for (int i = 0; i < count; i++)
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{
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byte data = frame[(win_offset + i) & frame_mask];
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m_output[dst++] = data;
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frame[frame_pos++] = data;
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frame_pos &= frame_mask;
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}
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}
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}
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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_input.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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