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216 lines
8.5 KiB
C#
216 lines
8.5 KiB
C#
//! \file ArcCherry.cs
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//! \date Wed Jun 24 21:22:56 2015
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//! \brief Cherry Soft archives implementation.
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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 System.Linq;
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using GameRes.Utility;
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using GameRes.Compression;
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namespace GameRes.Formats.Cherry
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{
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[Export(typeof(ArchiveFormat))]
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public class PakOpener : ArchiveFormat
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{
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public override string Tag { get { return "PAK/CHERRY"; } }
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public override string Description { get { return "Cherry Soft PACK resource archive"; } }
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public override uint Signature { get { return 0; } }
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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 PakOpener ()
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{
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Extensions = new string[] { "pak" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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int count = file.View.ReadInt32 (0);
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if (!IsSaneCount (count))
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return null;
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long base_offset = file.View.ReadUInt32 (4);
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if (base_offset >= file.MaxOffset || base_offset != (8 + count*0x18))
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return null;
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var dir = ReadIndex (file, 8, count, base_offset, file);
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return dir != null ? new ArcFile (file, this, dir) : null;
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}
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protected List<Entry> ReadIndex (ArcView index, int index_offset, int count, long base_offset, ArcView file)
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{
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uint index_size = (uint)count * 0x18u;
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if (index_size > index.View.Reserve (index_offset, index_size))
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return null;
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string arc_name = Path.GetFileNameWithoutExtension (file.Name);
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bool is_grp = arc_name.EndsWith ("GRP", StringComparison.InvariantCultureIgnoreCase);
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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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string name = index.View.ReadString (index_offset, 0x10);
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if (0 == name.Length)
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return null;
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var offset = base_offset + index.View.ReadUInt32 (index_offset+0x10);
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Entry entry;
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if (is_grp)
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{
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entry = new Entry {
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Name = Path.ChangeExtension (name, "grp"),
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Type = "image",
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Offset = offset
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};
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}
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else
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{
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entry = AutoEntry.Create (file, offset, name);
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}
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entry.Size = index.View.ReadUInt32 (index_offset+0x14);
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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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index_offset += 0x18;
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}
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return 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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if (!arc.File.View.AsciiEqual (entry.Offset, "GsWIN SC File"))
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return arc.File.CreateStream (entry.Offset, entry.Size);
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var text_offset = 0x68 + arc.File.View.ReadUInt32 (entry.Offset+0x5C);
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var text_size = arc.File.View.ReadUInt32 (entry.Offset+0x60);
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if (0 == text_size || text_offset+text_size > entry.Size)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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var data = new byte[entry.Size];
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arc.File.View.Read (entry.Offset, data, 0, entry.Size);
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for (uint i = 0; i < text_size; ++i)
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{
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data[text_offset+i] ^= (byte)i;
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}
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return new MemoryStream (data);
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}
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}
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internal class CherryPak : ArcFile
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{
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public CherryPak (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir)
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: base (arc, impl, dir)
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{
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class Pak2Opener : PakOpener
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{
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public override string Tag { get { return "PAK/CHERRY2"; } }
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public override string Description { get { return "Cherry Soft PACK resource archive v2"; } }
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public override uint Signature { get { return 0x52454843; } } // 'CHER'
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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 Pak2Opener ()
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{
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Extensions = new string[] { "pak" };
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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, "CHERRY PACK 2.0\0") &&
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!file.View.AsciiEqual (0, "CHERRY PACK 3.0\0"))
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return null;
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int version = file.View.ReadByte (0xC) - '0';
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bool is_compressed = file.View.ReadInt32 (0x10) != 0;
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int count = file.View.ReadInt32 (0x14);
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long base_offset = file.View.ReadUInt32 (0x18);
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bool is_encrypted = false;
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int min_offset = 0x1C + count * 0x18;
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while (!IsSaneCount (count) || base_offset >= file.MaxOffset
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|| (2 == version && !is_compressed && base_offset != min_offset))
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{
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if (is_encrypted)
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return null;
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// these keys seem to be constant across different games
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count ^= unchecked((int)0xBC138744);
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base_offset ^= 0x64E0BA23;
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is_encrypted = true;
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}
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List<Entry> dir;
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if (is_compressed)
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{
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var packed = file.View.ReadBytes (0x1C, (uint)base_offset-0x1C);
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Decrypt (packed, 0, packed.Length);
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using (var mem = new MemoryStream (packed))
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using (var lzss = new LzssStream (mem))
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using (var index = new ArcView (lzss, file.Name, (uint)count * 0x18))
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dir = ReadIndex (index, 0, count, base_offset, file);
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}
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else
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{
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dir = ReadIndex (file, 0x1C, count, base_offset, file);
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}
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if (null == dir)
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return null;
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if (is_encrypted && is_compressed)
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return new CherryPak (file, this, dir);
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else
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return new ArcFile (file, this, dir);
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}
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void Decrypt (byte[] data, int index, int length) // Exile ~Blood Royal 2~
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{
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for (int i = 0; i+1 < length; i += 2)
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{
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byte lo = (byte)(data[index+i ] ^ 0x33);
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byte hi = (byte)(data[index+i+1] ^ 0xCC);
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data[index+i ] = hi;
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data[index+i+1] = lo;
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}
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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 (!(arc is CherryPak) || entry.Size < 0x18)
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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 (data.Length >= 0x18)
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{
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unsafe
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{
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fixed (byte* raw = data)
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{
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uint* raw32 = (uint*)raw;
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raw32[0] ^= 0xA53CC35Au; // FIXME: Exile-specific?
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raw32[1] ^= 0x35421005u;
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raw32[4] ^= 0xCF42355Du;
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}
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}
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Decrypt (data, 0x18, (int)(data.Length - 0x18));
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}
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return new MemoryStream (data);
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}
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}
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}
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