2014-11-07 02:47:51 +04:00
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//! \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 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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namespace GameRes.Formats.Mg
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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 CanCreate { get { return false; } }
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public override ArcFile TryOpen (ArcView file)
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{
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uint count = file.View.ReadUInt32 (8);
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if (count > 0xffffff)
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return null;
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long cur_offset = 0x0c;
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var dir = new List<Entry> ((int)count);
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for (uint 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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2015-08-30 22:34:06 +04:00
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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2014-11-07 02:47:51 +04:00
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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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dir.Add (entry);
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cur_offset += 0x30;
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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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Stream input = arc.File.CreateStream (entry.Offset, entry.Size);
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string ext = Path.GetExtension (entry.Name).ToLowerInvariant();
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if (".png" == ext)
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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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input.Dispose();
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DecryptBlock (data);
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return new MemoryStream (data, false);
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}
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else if (".txt" == ext)
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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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input.Dispose();
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DecryptBlock (data);
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return DecompressStream (data);
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}
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else
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return input;
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}
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public static readonly byte[] Key = new byte[] {
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229, 101, 186, 26, 61, 198, 127, 158, 70, 21, 137
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};
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private byte[] DecryptBlock (byte[] input)
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{
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byte[] 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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return input;
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}
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private Stream DecompressStream (byte[] input)
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{
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int num = input.Length * 2;
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byte[] src = new byte[num];
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int num2;
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for (num2 = lzf_decompress (input, ref src); num2 == 0; num2 = lzf_decompress (input, ref src))
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{
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num *= 2;
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src = new byte[num];
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}
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return new MemoryStream (src, 0, num2, false);
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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 num = input.Length;
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int num2 = output.Length;
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uint num3 = 0u;
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uint num4 = 0u;
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do
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{
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uint num5 = (uint)input[(int)((UIntPtr)(num3++))];
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if (num5 < 32u)
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{
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num5 += 1u;
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if ((ulong)(num4 + num5) > (ulong)((long)num2))
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{
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return 0;
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}
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do
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{
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output[(int)((UIntPtr)(num4++))] = input[(int)((UIntPtr)(num3++))];
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}
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while (--num5 != 0u);
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}
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else
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{
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uint num6 = num5 >> 5;
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int num7 = (int)(num4 - ((num5 & 31u) << 8) - 1u);
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if (num6 == 7u)
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{
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num6 += (uint)input[(int)((UIntPtr)(num3++))];
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}
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num7 -= (int)input[(int)((UIntPtr)(num3++))];
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if ((ulong)(num4 + num6 + 2u) > (ulong)((long)num2))
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{
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return 0;
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}
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if (num7 < 0)
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{
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return 0;
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}
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output[(int)((UIntPtr)(num4++))] = output[num7++];
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output[(int)((UIntPtr)(num4++))] = output[num7++];
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do
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{
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output[(int)((UIntPtr)(num4++))] = output[num7++];
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}
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while (--num6 != 0u);
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}
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}
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while ((ulong)num3 < (ulong)((long)num));
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return (int)num4;
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}
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private static readonly uint uint_0 = 14u;
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private static readonly uint uint_1 = 16384u;
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private static readonly uint uint_2 = 32u;
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private static readonly uint uint_3 = 8192u;
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private static readonly uint uint_4 = 264u;
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private static readonly long[] long_0 = new long[uint_1];
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private static int lzf_compress (byte[] input, ref byte[] output)
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{
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int num = input.Length;
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int num2 = output.Length;
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Array.Clear (long_0, 0, (int)uint_1);
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uint num3 = 0u;
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uint num4 = 0u;
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uint num5 = (uint)((int)input[(int)((UIntPtr)0)] << 8 | (int)input[(int)((UIntPtr)(0 + 1))]);
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int num6 = 0;
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while (true)
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{
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if ((ulong)num3 < (ulong)((long)(num - 2)))
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{
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num5 = (num5 << 8 | (uint)input[(int)((UIntPtr)(num3 + 2u))]);
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long num7 = (long)((ulong)((num5 ^ num5 << 5) >> (int)(24u - uint_0 - num5 * 5u) & uint_1 - 1u));
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long num8 = long_0[(int)checked((IntPtr)num7)];
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long_0[(int)checked((IntPtr)num7)] = (long)((ulong)num3);
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long num9;
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if ((num9 = (long)((ulong)num3 - (ulong)num8 - 1uL)) < (long)((ulong)uint_3) && (ulong)(num3 + 4u) < (ulong)((long)num) && num8 > 0L && input[(int)checked((IntPtr)num8)] == input[(int)((UIntPtr)num3)] && input[(int)checked((IntPtr)unchecked(num8 + 1L))] == input[(int)((UIntPtr)(num3 + 1u))] && input[(int)checked((IntPtr)unchecked(num8 + 2L))] == input[(int)((UIntPtr)(num3 + 2u))])
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{
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uint num10 = 2u;
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uint num11 = (uint)(num - (int)num3 - 2);
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num11 = ((num11 <= uint_4) ? num11 : uint_4);
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if ((ulong)num4 + (ulong)((long)num6) + 1uL + 3uL >= (ulong)((long)num2))
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{
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return 0;
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}
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do
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{
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num10 += 1u;
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if (num10 >= num11)
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{
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break;
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}
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}
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while (input[(int)checked((IntPtr)unchecked(num8 + (long)((ulong)num10)))] == input[(int)((UIntPtr)(num3 + num10))]);
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// IL_199:
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if (num6 != 0)
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{
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output[(int)((UIntPtr)(num4++))] = (byte)(num6 - 1);
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num6 = -num6;
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do
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{
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output[(int)((UIntPtr)(num4++))] = input[(int)checked((IntPtr)unchecked((ulong)num3 + (ulong)((long)num6)))];
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}
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while (++num6 != 0);
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}
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num10 -= 2u;
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num3 += 1u;
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if (num10 < 7u)
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{
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output[(int)((UIntPtr)(num4++))] = (byte)((num9 >> 8) + (long)((ulong)((ulong)num10 << 5)));
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}
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else
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{
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output[(int)((UIntPtr)(num4++))] = (byte)((num9 >> 8) + 224L);
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output[(int)((UIntPtr)(num4++))] = (byte)(num10 - 7u);
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}
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output[(int)((UIntPtr)(num4++))] = (byte)num9;
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num3 += num10 - 1u;
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num5 = (uint)((int)input[(int)((UIntPtr)num3)] << 8 | (int)input[(int)((UIntPtr)(num3 + 1u))]);
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num5 = (num5 << 8 | (uint)input[(int)((UIntPtr)(num3 + 2u))]);
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long_0[(int)((UIntPtr)((num5 ^ num5 << 5) >> (int)(24u - uint_0 - num5 * 5u) & uint_1 - 1u))] = (long)((ulong)num3);
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num3 += 1u;
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num5 = (num5 << 8 | (uint)input[(int)((UIntPtr)(num3 + 2u))]);
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long_0[(int)((UIntPtr)((num5 ^ num5 << 5) >> (int)(24u - uint_0 - num5 * 5u) & uint_1 - 1u))] = (long)((ulong)num3);
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num3 += 1u;
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continue;
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// goto IL_199;
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}
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}
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else
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{
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if ((ulong)num3 == (ulong)((long)num))
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{
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break;
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}
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}
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num6++;
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num3 += 1u;
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if ((long)num6 == (long)((ulong)uint_2))
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{
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if ((ulong)(num4 + 1u + uint_2) >= (ulong)((long)num2))
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{
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return 0;
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}
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output[(int)((UIntPtr)(num4++))] = (byte)(uint_2 - 1u);
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num6 = -num6;
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do
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{
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output[(int)((UIntPtr)(num4++))] = input[(int)checked((IntPtr)unchecked((ulong)num3 + (ulong)((long)num6)))];
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}
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while (++num6 != 0);
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}
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}
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if (num6 != 0)
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{
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if ((ulong)num4 + (ulong)((long)num6) + 1uL >= (ulong)((long)num2))
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{
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return 0;
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}
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output[(int)((UIntPtr)(num4++))] = (byte)(num6 - 1);
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num6 = -num6;
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do
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{
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output[(int)((UIntPtr)(num4++))] = input[(int)checked((IntPtr)unchecked((ulong)num3 + (ulong)((long)num6)))];
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}
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while (++num6 != 0);
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}
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return (int)num4;
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}
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}
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}
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