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313 lines
11 KiB
C#
313 lines
11 KiB
C#
//! \file ArcAFA.cs
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//! \date Mon Apr 25 18:18:57 2016
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//! \brief AliceSoft System 4 engine resource archive.
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//
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// Copyright (C) 2016-2018 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 GameRes.Compression;
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namespace GameRes.Formats.AliceSoft
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{
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[Export(typeof(ArchiveFormat))]
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public class AfaOpener : ArchiveFormat
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{
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public override string Tag { get { return "AFA"; } }
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public override string Description { get { return "AliceSoft System 4 resource archive"; } }
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public override uint Signature { get { return 0x48414641; } } // 'AFAH'
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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 override ArcFile TryOpen (ArcView file)
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{
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if (!file.View.AsciiEqual (8, "AlicArch"))
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return TryOpenV3 (file);
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if (!file.View.AsciiEqual (0x1C, "INFO"))
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return null;
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int version = file.View.ReadInt32 (0x10);
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long base_offset = file.View.ReadUInt32 (0x18);
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uint packed_size = file.View.ReadUInt32 (0x20);
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int unpacked_size = file.View.ReadInt32 (0x24);
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int count = file.View.ReadInt32 (0x28);
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if (!IsSaneCount (count))
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return null;
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var dir = new List<Entry> (count);
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var name_buf = new byte[0x40];
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using (var input = file.CreateStream (0x2C, packed_size))
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using (var zstream = new ZLibStream (input, CompressionMode.Decompress))
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using (var index = new BinaryReader (zstream))
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{
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for (int i = 0; i < count; ++i)
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{
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int name_length = index.ReadInt32();
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int index_step = index.ReadInt32();
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if (name_length <= 0 || name_length > index_step || index_step > unpacked_size)
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return null;
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if (index_step > name_buf.Length)
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name_buf = new byte[index_step];
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if (index_step != index.Read (name_buf, 0, index_step))
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return null;
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var name = Encodings.cp932.GetString (name_buf, 0, name_length);
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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index.ReadInt32();
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index.ReadInt32();
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if (version < 2)
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index.ReadInt32();
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entry.Offset = index.ReadUInt32() + base_offset;
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entry.Size = index.ReadUInt32();
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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dir.Add (entry);
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}
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return new ArcFile (file, this, dir);
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}
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}
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internal ArcFile TryOpenV3 (ArcView file)
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{
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if (file.View.ReadInt32 (8) != 3)
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return null;
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uint index_size = file.View.ReadUInt32 (4);
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var index = new AfaIndexReader (file, index_size);
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var dir = index.Read();
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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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static readonly byte[] AffKey = {
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0xC8, 0xBB, 0x8F, 0xB7, 0xED, 0x43, 0x99, 0x4A,
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0xA2, 0x7E, 0x5B, 0xB0, 0x68, 0x18, 0xF8, 0x88
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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 (entry.Size <= 0x10 || !arc.File.View.AsciiEqual (entry.Offset, "AFF\0"))
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return base.OpenEntry (arc, entry);
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uint data_size = entry.Size - 0x10u;
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uint encrypted_length = Math.Min (0x40u, data_size);
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var prefix = arc.File.View.ReadBytes (entry.Offset+0x10, encrypted_length);
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for (int i = 0; i < prefix.Length; ++i)
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prefix[i] ^= AffKey[i & 0xF];
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if (data_size <= 0x40)
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return new BinMemoryStream (prefix, entry.Name);
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var rest = arc.File.CreateStream (entry.Offset+0x10+encrypted_length, data_size-encrypted_length);
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return new PrefixStream (prefix, rest);
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}
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}
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internal sealed class AfaIndexReader
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{
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ArcView m_file;
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uint m_data_offset;
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byte[] m_dict;
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public AfaIndexReader (ArcView file, uint index_size)
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{
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m_file = file;
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m_data_offset = index_size + 8;
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}
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public List<Entry> Read ()
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{
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byte[] packed;
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using (var input = m_file.CreateStream (12, m_data_offset-12))
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using (var bits = new MsbBitStream (input))
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{
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bits.GetNextBit();
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m_dict = ReadBytes (bits);
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if (null == m_dict)
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return null;
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int packed_size = ReadInt32 (bits);
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int unpacked_size = ReadInt32 (bits);
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packed = new byte[packed_size];
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for (int i = 0; i < packed_size; ++i)
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{
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packed[i] = (byte)bits.GetBits (8);
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}
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}
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using (var bstr = new BinMemoryStream (packed))
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using (var zstr = new ZLibStream (bstr, CompressionMode.Decompress))
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using (var index = new MsbBitStream (zstr))
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{
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index.GetNextBit();
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int count = ReadInt32 (index);
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if (!ArchiveFormat.IsSaneCount (count))
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return null;
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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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if (index.GetBits (2) == -1)
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break;
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var name_buf = ReadEncryptedChars (index);
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if (null == name_buf)
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return null;
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var name = DecryptString (name_buf, name_buf.Length);
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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ReadInt32 (index);
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ReadInt32 (index);
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entry.Offset = (uint)ReadInt32 (index) + m_data_offset;
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entry.Size = (uint)ReadInt32 (index);
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if (!entry.CheckPlacement (m_file.MaxOffset))
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return null;
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dir.Add (entry);
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}
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return dir;
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}
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}
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byte[] ReadBytes (MsbBitStream input)
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{
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int buf_size = ReadInt32 (input);
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var buf = new byte[buf_size];
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int dst = 0;
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var rnd = new RandomGenerator ((uint)buf_size);
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while (dst < buf_size)
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{
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int count = (int)rnd.GetNext() & 3;
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int skipped = input.GetBits (count + 1);
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if (-1 == skipped)
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return null;
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rnd.GetNext();
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int v = input.GetBits (8);
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if (-1 == v)
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return null;
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buf[dst++] = (byte)v;
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}
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return buf;
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}
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ushort[] ReadEncryptedChars (MsbBitStream input)
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{
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int buf_size = ReadInt32 (input);
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var buf = new ushort[buf_size];
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int dst = 0;
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var rnd = new RandomGenerator ((uint)buf_size);
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while (dst < buf_size)
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{
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int count = (int)rnd.GetNext() & 3;
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int skipped = input.GetBits (count + 1);
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if (-1 == skipped)
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return null;
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rnd.GetNext();
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int lo = input.GetBits (8);
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int hi = input.GetBits (8);
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if (-1 == lo || -1 == hi)
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return null;
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buf[dst++] = (ushort)(lo | hi << 8);
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}
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return buf;
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}
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byte[] m_string_buf = new byte[0x100];
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string DecryptString (ushort[] input, int input_length)
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{
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if (m_string_buf.Length < input_length)
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m_string_buf = new byte[input_length];
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for (int i = 0; i < input_length; ++i)
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{
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m_string_buf[i] = (byte)(m_dict[input[i]] ^ 0xA4);
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}
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return Encodings.cp932.GetString (m_string_buf, 0, input_length);
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}
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static int ReadInt32 (MsbBitStream input)
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{
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int b0 = input.GetBits (8);
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int b1 = input.GetBits (8);
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int b2 = input.GetBits (8);
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int b3 = input.GetBits (8);
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return b3 << 24 | b2 << 16 | b1 << 8 | b0;
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}
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}
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internal class RandomGenerator
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{
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uint[] m_state = new uint[521];
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int m_current;
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public RandomGenerator (uint seed)
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{
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Init (seed);
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}
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public void Init (uint seed)
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{
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uint val = 0;
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for (int i = 0; i < 17; ++i)
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{
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for (int j = 0; j < 32; ++j)
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{
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seed = 1566083941u * seed + 1;
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val = seed & 0x80000000 | (val >> 1);
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}
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m_state[i] = val;
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}
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m_state[16] = m_state[15] ^ (m_state[0] >> 9) ^ (m_state[16] << 23);
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for (int i = 17; i < 521; ++i)
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{
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m_state[i] = m_state[i-1] ^ (m_state[i-16] >> 9) ^ (m_state[i-17] << 23);
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}
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Shuffle();
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Shuffle();
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Shuffle();
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Shuffle();
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m_current = -1;
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}
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public uint GetNext ()
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{
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++m_current;
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if (m_current >= 521)
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{
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Shuffle();
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m_current = 0;
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}
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return m_state[m_current];
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}
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void Shuffle ()
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{
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for (int i = 0; i < 32; i += 4)
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{
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m_state[i ] ^= m_state[i + 489];
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m_state[i+1] ^= m_state[i + 490];
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m_state[i+2] ^= m_state[i + 491];
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m_state[i+3] ^= m_state[i + 492];
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}
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for (int i = 32; i < 521; i += 3)
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{
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m_state[i ] ^= m_state[i - 32];
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m_state[i+1] ^= m_state[i - 31];
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m_state[i+2] ^= m_state[i - 30];
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}
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}
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}
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}
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