mirror of
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366 lines
12 KiB
C#
366 lines
12 KiB
C#
//! \file ArcMRG.cs
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//! \date Mon Jul 13 03:20:13 2015
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//! \brief F&C Co. MGR archive format.
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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.Text;
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using GameRes.Utility;
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namespace GameRes.Formats.FC01
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{
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internal class MrgEntry : PackedEntry
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{
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public int Method;
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}
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[Export(typeof(ArchiveFormat))]
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public class MrgOpener : ArchiveFormat
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{
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public override string Tag { get { return "MRG"; } }
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public override string Description { get { return "F&C Co. engine resource archive"; } }
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public override uint Signature { get { return 0x0047524D; } } // 'MRG'
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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 static readonly Tuple<byte[], byte[]> KnownKey = Tuple.Create (
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// Konata yori Kanata made
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new byte[] { 0, 0x68, 0x5F }, new byte[] { 0, 0x37 }
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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 (12);
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if (!IsSaneCount (count))
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return null;
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int key1index = file.View.ReadUInt16 (4);
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int key2index = file.View.ReadUInt16 (6);
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if (key2index != 0 && key1index == 0)
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return null;
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uint index_size = file.View.ReadUInt32 (8) - 0x10;
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if (index_size < 0x40 || index_size >= file.MaxOffset)
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return null;
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var index = new byte[index_size];
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if (index.Length != file.View.Read (0x10, index, 0, index_size))
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return null;
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/*
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var key_src = KnownKey;
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if (key1index >= key_src.Item1.Length || key2index >= key_src.Item2.Length)
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return null;
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byte index_key = (byte)(key_src.Item1[key1index] + key_src.Item2[key2index]);
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*/
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var key = GuessKey (file, index);
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if (null == key)
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throw new UnknownEncryptionScheme();
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byte index_key = key.Value;
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int remaining = index.Length;
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for (int i = 0; i < index.Length; ++i)
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{
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byte v = index[i];
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v = (byte)(v << 1 | v >> 7);
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index[i] = (byte)(v ^ index_key);
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index_key += (byte)remaining--;
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}
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int current_offset = 0;
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uint next_offset = LittleEndian.ToUInt32 (index, current_offset+0x1C);
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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 = Binary.GetCString (index, current_offset, 0x0E);
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var entry = new MrgEntry
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{
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Name = name,
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Type = FormatCatalog.Instance.GetTypeFromName (name),
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Offset = next_offset,
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Method = index[current_offset+0x12],
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};
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next_offset = LittleEndian.ToUInt32 (index, current_offset+0x3C);
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entry.Size = next_offset - (uint)entry.Offset;
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if (entry.Offset < index_size || !entry.CheckPlacement (file.MaxOffset))
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return null;
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entry.IsPacked = entry.Method != 0;
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entry.UnpackedSize = LittleEndian.ToUInt32 (index, current_offset+0x0E);
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dir.Add (entry);
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current_offset += 0x20;
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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 packed_entry = entry as MrgEntry;
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if (null == packed_entry || !packed_entry.IsPacked || packed_entry.Method > 3)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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Stream input;
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if (packed_entry.Method >= 2)
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{
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if (entry.Size < 0x108)
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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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var reader = new MrgDecoder (data);
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reader.Unpack();
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input = new MemoryStream (reader.Data);
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}
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else
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input = arc.File.CreateStream (entry.Offset, entry.Size);
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if (packed_entry.Method < 3)
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{
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using (input)
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using (var reader = new MrgLzssReader (input, (int)input.Length, (int)packed_entry.UnpackedSize))
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{
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reader.Unpack();
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return new MemoryStream (reader.Data);
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}
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}
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return input;
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}
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private byte? GuessKey (ArcView file, byte[] index)
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{
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uint actual_offset = (uint)file.MaxOffset;
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byte v = index[index.Length-1]; // last_offset
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v = (byte)(v << 1 | v >> 7);
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byte key = (byte)(v ^ (actual_offset >> 24));
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int remaining = 1;
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uint last_offset = (byte)(v ^ key);
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for (int i = index.Length-2; i >= index.Length-4; --i)
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{
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key -= (byte)++remaining;
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v = index[i];
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v = (byte)(v << 1 | v >> 7);
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last_offset = (last_offset << 8) | (uint)(v ^ key);
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}
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if (last_offset != actual_offset)
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return null;
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while (remaining++ < index.Length)
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key -= (byte)remaining;
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return key;
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}
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}
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/// <summary>
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/// LZSS decompression with slightly modified offset/count values encoding.
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/// </summary>
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internal sealed class MrgLzssReader : IDisposable
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{
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BinaryReader m_input;
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byte[] m_output;
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int m_size;
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public byte[] Data { get { return m_output; } }
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public MrgLzssReader (Stream input, int input_length, int output_length)
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{
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m_input = new BinaryReader (input, Encoding.ASCII, true);
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m_output = new byte[output_length];
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m_size = input_length;
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}
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public void Unpack ()
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{
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int dst = 0;
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var frame = new byte[0x1000];
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int frame_pos = 0xfee;
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int frame_mask = 0xfff;
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int remaining = m_size;
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while (remaining > 0)
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{
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int ctl = m_input.ReadByte();
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--remaining;
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for (int bit = 1; remaining > 0 && bit != 0x100; bit <<= 1)
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{
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if (dst >= m_output.Length)
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return;
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if (0 != (ctl & bit))
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{
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byte b = m_input.ReadByte();
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--remaining;
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frame[frame_pos++] = b;
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frame_pos &= frame_mask;
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m_output[dst++] = b;
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}
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else
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{
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if (remaining < 2)
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return;
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int offset = m_input.ReadUInt16();
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remaining -= 2;
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int count = (offset >> 12) + 3;
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for ( ; count != 0; --count)
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{
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if (dst >= m_output.Length)
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break;
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offset &= frame_mask;
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byte v = frame[offset++];
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frame[frame_pos++] = v;
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frame_pos &= frame_mask;
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m_output[dst++] = v;
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}
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}
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}
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}
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}
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#region IDisposable Members
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bool disposed = false;
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public void Dispose ()
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{
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if (!disposed)
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{
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m_input.Dispose();
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disposed = true;
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}
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GC.SuppressFinalize (this);
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}
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#endregion
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}
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internal class MrgDecoder
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{
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byte[] m_input;
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byte[] m_output;
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int m_start_index;
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int m_src;
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public byte[] Data { get { return m_output; } }
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public byte Key { get; set; }
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public MrgDecoder (byte[] data, int index = 0)
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{
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m_input = data;
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m_src = index;
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uint unpacked_size = LittleEndian.ToUInt32 (data, m_src);
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unpacked_size ^= LittleEndian.ToUInt32 (data, m_src+0x104);
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m_src += 4;
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m_start_index = m_src;
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m_output = new byte[unpacked_size];
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}
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public MrgDecoder (byte[] data, int index, uint unpacked_size)
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{
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m_input = data;
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m_start_index = index;
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m_src = index;
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m_output = new byte[unpacked_size];
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}
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public void ResetKey (byte key)
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{
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m_src = m_start_index;
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Key = key;
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}
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ushort[] word_10036650 = new ushort[0x200];
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byte[] byte_table = new byte[0xff00];
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public int Unpack () // sub_10026EB0
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{
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uint quant = InitTable();
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if (0 == quant)
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throw new InvalidFormatException();
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uint mask = GetMask (quant);
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uint scale = 0x10000 / quant;
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uint b = 0;
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uint c = 0xffffffff;
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int dst = 0;
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uint a = BigEndian.ToUInt32 (m_input, m_src);
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m_src += 4;
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while (dst < m_output.Length)
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{
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c = ((c >> 8) * scale) >> 8;
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uint v = (a - b) / c;
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if (v > quant)
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throw new InvalidFormatException();
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v = byte_table[v];
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m_output[dst++] = (byte)v;
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b += word_10036650[v*2] * c;
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c *= word_10036650[v*2+1];
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while (0 == (((c + b) ^ b) & 0xFF000000))
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{
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if (m_src >= m_input.Length)
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return dst;
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a <<= 8;
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b <<= 8;
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c <<= 8;
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a |= m_input[m_src++];
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}
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while (c <= mask)
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{
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if (m_src >= m_input.Length)
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return dst;
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c = (~b & mask) << 8;
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a <<= 8;
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b <<= 8;
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a |= m_input[m_src++];
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}
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}
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return dst;
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}
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ushort InitTable () // sub_10026E30
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{
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ushort d = 0;
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int t = 0;
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byte key = Key;
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for (int i = 0; i < 0x100; i++)
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{
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byte c = m_input[m_src++];
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if (0 != Key)
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{
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c = (byte)(((c << 1) | (c >> 7)) ^ key);
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key -= (byte)i;
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}
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word_10036650[i*2] = d;
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word_10036650[i*2+1] = c;
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d += c;
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for (int j = 0; j < c; ++j)
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byte_table[t++] = (byte)i;
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}
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return d;
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}
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uint GetMask (uint d) // sub_10026DC0
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{
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d--;
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d >>= 8;
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uint result = 0xff;
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while (d > 0)
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{
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d >>= 1;
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result = (result << 1) | 1;
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}
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return result;
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}
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}
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}
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