mirror of
https://github.com/crskycode/GARbro.git
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240 lines
9.2 KiB
C#
240 lines
9.2 KiB
C#
//! \file ArcAZSys.cs
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//! \date Wed Apr 22 09:52:23 2015
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//! \brief AZ system archive implementation.
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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 GameRes.Compression;
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using GameRes.Formats.Properties;
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using GameRes.Formats.Strings;
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using GameRes.Utility;
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namespace GameRes.Formats.AZSys
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{
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[Serializable]
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public class AsbScheme : ResourceScheme
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{
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public Dictionary<string, uint> KnownKeys;
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}
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internal class AsbOptions : ResourceOptions
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{
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public uint AsbKey;
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}
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internal class AsbArchive : ArcFile
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{
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public readonly uint Key;
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public AsbArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, uint key)
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: base (arc, impl, dir)
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{
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Key = key;
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}
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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 "ARC/AZ"; } }
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public override string Description { get { return "AZ system resource archive"; } }
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public override uint Signature { get { return 0x1a435241; } } // 'ARC\x1a'
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public override bool IsHierarchic { get { return false; } }
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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 static Dictionary<string, uint> KnownKeys = new Dictionary<string, uint>();
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public override ResourceScheme Scheme
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{
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get { return new AsbScheme { KnownKeys = KnownKeys }; }
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set { KnownKeys = ((AsbScheme)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 ext_count = file.View.ReadInt32 (4);
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int count = file.View.ReadInt32 (8);
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uint index_length = file.View.ReadUInt32 (12);
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if (ext_count < 1 || ext_count > 8 || count <= 0 || count > 0xfffff
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|| index_length <= 0x14 || index_length >= file.MaxOffset)
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return null;
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var packed_index = file.View.ReadBytes (0x30, index_length);
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if (packed_index.Length != index_length)
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return null;
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uint base_offset = 0x30 + index_length;
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uint crc = LittleEndian.ToUInt32 (packed_index, 0);
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if (crc != Crc32.Compute (packed_index, 0x14, packed_index.Length-0x14))
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throw new InvalidFormatException ("CRC32 mismatch");
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var reader = new IndexReader (packed_index, count);
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var index = reader.Unpack();
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int index_offset = 0;
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bool contains_scripts = false;
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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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var name = Binary.GetCString (index, index_offset + 0x10, 0x30);
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if (name.Length > 0)
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{
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = base_offset + LittleEndian.ToUInt32 (index, index_offset);
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entry.Size = LittleEndian.ToUInt32 (index, index_offset + 4);
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if (entry.CheckPlacement (file.MaxOffset))
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{
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dir.Add (entry);
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contains_scripts = contains_scripts || name.EndsWith (".asb", StringComparison.InvariantCultureIgnoreCase);
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}
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}
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index_offset += 0x40;
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}
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if (0 == dir.Count)
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return null;
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if (!contains_scripts || 0 == KnownKeys.Count)
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return new ArcFile (file, this, dir);
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var options = Query<AsbOptions> (arcStrings.ArcEncryptedNotice);
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if (0 == options.AsbKey)
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return new ArcFile (file, this, dir);
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return new AsbArchive (file, this, dir, options.AsbKey);
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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 azarc = arc as AsbArchive;
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if (null == azarc || entry.Size < 20
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|| !arc.File.View.AsciiEqual (entry.Offset, "ASB\x1a"))
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return arc.File.CreateStream (entry.Offset, entry.Size);
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uint packed = arc.File.View.ReadUInt32 (entry.Offset+4);
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uint unpacked = arc.File.View.ReadUInt32 (entry.Offset+8);
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if (12 + packed != entry.Size)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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uint key = azarc.Key ^ unpacked;
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key ^= ((key << 12) | key) << 11;
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uint first = arc.File.View.ReadUInt16 (entry.Offset+16);
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first = (first - key) & 0xffff;
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if (first != 0xda78) // doesn't look like zlib stream
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return arc.File.CreateStream (entry.Offset, entry.Size);
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var input = arc.File.View.ReadBytes (entry.Offset+12, packed);
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unsafe
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{
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fixed (byte* raw = input)
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{
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uint* encoded = (uint*)raw;
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for (int i = 0; i < input.Length/4; ++i)
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encoded[i] -= key;
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}
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}
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// first 4 bytes are CRC32 of the compressed stream
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uint checksum = LittleEndian.ToUInt32 (input, 0);
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if (checksum != Crc32.Compute (input, 4, input.Length-4))
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return arc.File.CreateStream (entry.Offset, entry.Size);
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return new ZLibStream (new MemoryStream (input, 4, input.Length-4), CompressionMode.Decompress);
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}
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public override ResourceOptions GetDefaultOptions ()
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{
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return new AsbOptions { AsbKey = GetAsbKey (Settings.Default.AZScriptScheme) };
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}
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public override object GetAccessWidget ()
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{
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return new GUI.WidgetAZ();
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}
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uint GetAsbKey (string scheme)
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{
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uint key;
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if (KnownKeys.TryGetValue (scheme, out key))
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return key;
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return 0;
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}
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internal class IndexReader
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{
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byte[] m_input;
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byte[] m_output;
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int m_control_len;
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int m_compr1_len;
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int m_compr2_len;
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int m_output_len;
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public byte[] Index { get { return m_output; } }
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public IndexReader (byte[] packed, int count)
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{
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m_input = packed;
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m_output = new byte[count*0x40];
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m_control_len = LittleEndian.ToInt32 (packed, 4);
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m_compr1_len = LittleEndian.ToInt32 (packed, 8);
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m_compr2_len = LittleEndian.ToInt32 (packed, 12);
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m_output_len = LittleEndian.ToInt32 (packed, 0x10);
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}
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public byte[] Unpack ()
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{
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int control = 0x14;
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int compr1 = control + m_control_len;
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int compr2 = compr1 + m_compr1_len;
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int dst = 0;
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byte mask = 0x80;
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int copy_count;
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while (dst < m_output.Length)
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{
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if (0 != (m_input[control] & mask))
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{
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int offset = LittleEndian.ToUInt16 (m_input, compr1);
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compr1 += 2;
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copy_count = (offset >> 13) + 3;
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offset &= 0x1fff;
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offset++;
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Binary.CopyOverlapped (m_output, dst-offset, dst, copy_count);
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dst += copy_count;
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}
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else
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{
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copy_count = m_input[compr2++] + 1;
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Buffer.BlockCopy (m_input, compr2, m_output, dst, copy_count);
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compr2 += copy_count;
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dst += copy_count;
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}
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mask >>= 1;
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if (0 == mask)
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{
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++control;
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mask = 0x80;
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}
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}
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return m_output;
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}
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}
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}
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}
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