mirror of
https://github.com/crskycode/GARbro.git
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240 lines
8.4 KiB
C#
240 lines
8.4 KiB
C#
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//! \file ArcPP.cs
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//! \date 2022 Jun 01
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//! \brief Illusion resource archive.
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//
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// Copyright (C) 2022 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 GameRes.Utility;
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using System;
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using System.IO;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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namespace GameRes.Formats.Illusion
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{
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[Serializable]
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public class PpEncryptionScheme
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{
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public byte Method;
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public uint[] Key;
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}
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[Serializable]
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public class PpScheme : ResourceScheme
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{
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public IDictionary<string, PpEncryptionScheme> KnownKeys;
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}
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public class PpArchive : ArcFile
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{
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public readonly byte Method;
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public readonly PpEncryptionScheme Scheme;
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public PpArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte encMethod, PpEncryptionScheme scheme)
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: base (arc, impl, dir)
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{
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Method = encMethod;
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Scheme = scheme;
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class PpOpener : ArchiveFormat
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{
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public override string Tag { get { return "PP/ILLUSION"; } }
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public override string Description { get { return "Illusion resource archive"; } }
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public override uint Signature { get { return 0x5650505B; } } // '[PPVER]'
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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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static readonly byte[][] DefaultIndexKey = new byte[][] {
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new byte[] { 0xFA, 0x49, 0x7B, 0x1C, 0xF9, 0x4D, 0x83, 0x0A },
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new byte[] { 0x3A, 0xE3, 0x87, 0xC2, 0xBD, 0x1E, 0xA6, 0xFE }
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};
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public override ArcFile TryOpen (ArcView file)
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{
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if (!file.View.AsciiEqual (0, "[PPVER]\0"))
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return null;
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var buffer = file.View.ReadBytes (8, 9);
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DecryptIndex (buffer, 0, 4);
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int version = buffer.ToInt32 (0);
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DecryptIndex (buffer, 4, 1);
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byte encryption_method = buffer[4];
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if (encryption_method > 4)
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return null;
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DecryptIndex (buffer, 5, 4);
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int count = buffer.ToInt32 (5);
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if (!IsSaneCount (count))
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return null;
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if (version < 0x6C)
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return null;
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var dir = new List<Entry> (count);
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uint index_offset = 0x11;
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uint index_size = (uint)(count * 0x120);
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var index = file.View.ReadBytes (index_offset, index_size);
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index_offset += index_size;
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DecryptIndex (index, 0, index.Length);
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int pos = 0;
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for (int i = 0; i < count; ++i)
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{
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var name = Binary.GetCString (index, pos, 0x104);
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pos += 0x104;
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var entry = Create<Entry> (name);
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entry.Size = index.ToUInt32 (pos);
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entry.Offset = index.ToUInt32 (pos+4);
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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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pos += 0x1C;
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}
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var scheme = QueryEncryptionScheme (file);
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if (null == scheme)
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return null;
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return new PpArchive (file, this, dir, encryption_method, scheme);
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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 parc = arc as PpArchive;
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if (null == parc || 2 == parc.Method)
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return base.OpenEntry (arc, entry);
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var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
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if (1 == parc.Method)
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DecryptData1 (data, parc.Scheme);
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else if (3 == parc.Method)
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DecryptData3 (data, parc.Scheme);
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else if (4 == parc.Method)
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data = UnpackData (data);
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return new BinMemoryStream (data, entry.Name);
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}
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byte[] UnpackData (byte[] input)
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{
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return input; // decompression not implemented
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}
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void DecryptData1 (byte[] data, PpEncryptionScheme scheme)
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{
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if (scheme.Method > 2 || scheme.Key.Length == 0)
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return;
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if (0 == scheme.Method)
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{
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for (int i = 0; i < data.Length; ++i)
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{
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data[i] ^= (byte)scheme.Key[i % scheme.Key.Length];
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}
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return;
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}
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unsafe
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{
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fixed (byte* data8 = data)
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{
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if (1 == scheme.Method)
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{
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ushort* data16 = (ushort*)data8;
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int size = data.Length / 2;
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for (int i = 0; i < size; ++i)
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{
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data16[i] ^= (ushort)scheme.Key[i % scheme.Key.Length];
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}
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}
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else if (2 == scheme.Method)
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{
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uint* data32 = (uint*)data8;
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int size = data.Length / 4;
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for (int i = 0; i < size; ++i)
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{
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data32[i] ^= scheme.Key[i % scheme.Key.Length];
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}
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}
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}
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}
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}
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void DecryptData3 (byte[] data, PpEncryptionScheme scheme)
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{
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if (scheme.Key.Length < 8)
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return;
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var key0 = new ushort[] { (ushort)scheme.Key[0], (ushort)scheme.Key[1], (ushort)scheme.Key[2], (ushort)scheme.Key[3] };
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var key1 = new ushort[] { (ushort)scheme.Key[4], (ushort)scheme.Key[5], (ushort)scheme.Key[6], (ushort)scheme.Key[7] };
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unsafe
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{
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fixed (byte* data8 = data)
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{
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ushort* data16 = (ushort*)data8;
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int size = data.Length / 2;
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for (int i = 0; i < size; ++i)
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{
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int k = i & 3;
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key0[k] += key1[k];
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data16[i] ^= key0[k];
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}
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}
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}
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}
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internal void DecryptIndex (byte[] data, int pos, int length)
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{
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var key0 = DefaultIndexKey[0].Clone() as byte[];
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var key1 = DefaultIndexKey[1];
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for (int i = 0; i < length; ++i)
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{
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int k = i & 7;
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key0[k] += key1[k];
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data[pos+i] ^= key0[k];
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}
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}
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PpScheme DefaultScheme = new PpScheme
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{
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KnownKeys = new Dictionary<string, PpEncryptionScheme>()
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};
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internal IDictionary<string, PpEncryptionScheme> KnownKeys { get { return DefaultScheme.KnownKeys; } }
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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 = (PpScheme)value; }
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}
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PpEncryptionScheme QueryEncryptionScheme (ArcView file)
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{
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var title = FormatCatalog.Instance.LookupGame (file.Name);
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if (string.IsNullOrEmpty (title))
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title = FormatCatalog.Instance.LookupGame (file.Name, @"..\*.exe");
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if (string.IsNullOrEmpty (title))
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return null;
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PpEncryptionScheme key;
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if (!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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}
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}
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