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263 lines
9.3 KiB
C#
263 lines
9.3 KiB
C#
//! \file ArcMGPK.cs
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//! \date Mon Nov 03 20:03:36 2014
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//! \brief MGPK archive format.
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//
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// Copyright (C) 2014-2016 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.Text;
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using GameRes.Formats.Strings;
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using GameRes.Utility;
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namespace GameRes.Formats.Mg
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{
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internal class MgArchive : ArcFile
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{
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public readonly byte[] Key;
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public MgArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] 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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public class MgOptions : ResourceOptions
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{
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public byte[] Key;
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}
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[Serializable]
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public class MgScheme : ResourceScheme
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{
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public Dictionary<string, byte[]> KnownKeys;
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}
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[Export(typeof(ArchiveFormat))]
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public class MgpkOpener : ArchiveFormat
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{
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public override string Tag { get { return "MGPK"; } }
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public override string Description { get { return "MG resource archive"; } }
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public override uint Signature { get { return 0x4b50474d; } } // MGPK
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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 MgpkOpener ()
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{
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Extensions = new string[] { "pac" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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int version = file.View.ReadInt32 (4);
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int count = file.View.ReadInt32 (8);
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if (version < 1 || !IsSaneCount (count))
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return null;
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long cur_offset = 0x0C;
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var dir = new List<Entry> (count);
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bool has_encrypted = false;
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for (int i = 0; i < count; ++i)
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{
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uint name_length = file.View.ReadByte (cur_offset);
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string name = file.View.ReadString (cur_offset+1, name_length, Encoding.UTF8);
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var entry = Create<Entry> (name);
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entry.Offset = file.View.ReadUInt32 (cur_offset+0x20);
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entry.Size = file.View.ReadUInt32 (cur_offset+0x24);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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has_encrypted = has_encrypted || name.HasAnyOfExtensions ("png", "txt");
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dir.Add (entry);
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cur_offset += 0x30;
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}
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if (has_encrypted && KnownKeys.Count > 0)
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{
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var key = QueryKey (file.Name);
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if (key != null)
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return new MgArchive (file, this, dir, key);
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}
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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 mgarc = arc as MgArchive;
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Stream input = arc.File.CreateStream (entry.Offset, entry.Size);
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if (null == mgarc || null == mgarc.Key)
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return input;
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using (input)
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{
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byte[] data = new byte[entry.Size];
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input.Read (data, 0, data.Length);
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DecryptData (data, mgarc.Key);
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if (entry.Name.HasExtension ("txt"))
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return DecompressStream (data);
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return new BinMemoryStream (data, entry.Name);
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}
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}
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protected virtual void DecryptData (byte[] input, byte[] key)
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{
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key = (byte[])key.Clone();
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for (int i = 0; i < input.Length; i++)
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{
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input[i] ^= key[i % key.Length];
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key[i % key.Length] += 27;
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}
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}
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internal Stream DecompressStream (byte[] input)
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{
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byte[] output = new byte[input.Length * 2];
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int output_size = lzf_decompress (input, ref output);
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return new BinMemoryStream (output, 0, output_size);
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}
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private static int lzf_decompress (byte[] input, ref byte[] output)
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{
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int src = 0;
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int dst = 0;
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while (src < input.Length)
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{
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int count = input[src++];
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if (count < 32)
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{
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++count;
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if (dst + count > output.Length)
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{
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Array.Resize (ref output, Math.Max (checked(output.Length * 2), dst + count));
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}
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Buffer.BlockCopy (input, src, output, dst, count);
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src += count;
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dst += count;
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}
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else
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{
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int offset = (count & 31) << 8;
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count >>= 5;
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if (7 == count)
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{
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count += input[src++];
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}
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count += 2;
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offset += input[src++] + 1;
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if (offset > dst)
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throw new InvalidFormatException();
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if (dst + count > output.Length)
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{
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Array.Resize (ref output, Math.Max (checked(output.Length * 2), dst + count));
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}
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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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}
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return dst;
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}
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internal byte[] QueryKey (string arc_name)
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{
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var options = Query<MgOptions> (arcStrings.ArcEncryptedNotice);
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return options.Key;
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}
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public override ResourceOptions GetDefaultOptions ()
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{
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return new MgOptions { Key = GetKey (Properties.Settings.Default.MGPKTitle) };
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}
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public override object GetAccessWidget ()
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{
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return new GUI.WidgetMGPK();
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}
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public static byte[] GetKey (string title)
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{
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byte[] key;
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if (string.IsNullOrEmpty (title) || !KnownKeys.TryGetValue (title, out key))
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return null;
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return key;
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}
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public static Dictionary<string, byte[]> KnownKeys { get { return DefaultScheme.KnownKeys; } }
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static MgScheme DefaultScheme = new MgScheme { KnownKeys = new Dictionary<string, byte[]>() };
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public override ResourceScheme Scheme
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{
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get { return DefaultScheme; }
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set { DefaultScheme = (MgScheme)value; }
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class Mgpk0Opener : MgpkOpener
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{
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public override string Tag { get { return "MGPK0"; } }
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public override string Description { get { return "MG resource archive"; } }
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public override uint Signature { get { return 0x4B50474D; } } // MGPK
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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 override ArcFile TryOpen (ArcView file)
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{
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int version = file.View.ReadInt32 (4);
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int count = file.View.ReadInt32 (8);
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if (version != 0 || !IsSaneCount (count))
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return null;
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long cur_offset = 0x0C;
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var dir = new List<Entry> (count);
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bool has_encrypted = false;
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for (int i = 0; i < count; ++i)
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{
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string name = file.View.ReadString (cur_offset, 0x20, Encoding.UTF8);
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var entry = Create<Entry> (name);
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entry.Offset = file.View.ReadUInt32 (cur_offset+0x20);
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entry.Size = file.View.ReadUInt32 (cur_offset+0x2C);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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has_encrypted = has_encrypted || name.HasAnyOfExtensions ("png", "txt");
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dir.Add (entry);
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cur_offset += 0x30;
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}
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if (has_encrypted)
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{
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var key = QueryKey (file.Name);
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if (key != null)
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return new MgArchive (file, this, dir, key);
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}
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return new ArcFile (file, this, dir);
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}
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protected override void DecryptData (byte[] input, byte[] key)
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{
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for (int i = 0; i < input.Length; i++)
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{
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input[i] ^= key[i % key.Length];
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}
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}
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public override ResourceScheme Scheme { get; set; }
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}
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}
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