mirror of
https://github.com/crskycode/GARbro.git
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369 lines
13 KiB
C#
369 lines
13 KiB
C#
//! \file ArcARC4.cs
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//! \date Wed Aug 10 15:50:21 2016
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//! \brief Caramel BOX resource archive.
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//
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// Copyright (C) 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 GameRes.Utility;
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namespace GameRes.Formats.CaramelBox
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{
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internal class Arc4Entry : PackedEntry
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{
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public List<long> Segments;
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}
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[Export(typeof(ArchiveFormat))]
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public class Arc4Opener : ArchiveFormat
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{
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public override string Tag { get { return "ARC4"; } }
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public override string Description { get { return "Caramel BOX resource archive"; } }
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public override uint Signature { get { return 0x34435241; } } // 'ARC4'
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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 Arc4Opener ()
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{
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Extensions = new string[] { "bin", "dat", "データ" };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (0x010000 != file.View.ReadUInt32 (4))
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return null;
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int count = file.View.ReadInt32 (0x10);
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if (!IsSaneCount (count))
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return null;
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uint index_length = file.View.ReadUInt32 (8);
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uint alignment = file.View.ReadUInt32 (0xC);
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int index_offset = file.View.ReadInt32 (0x14);
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int names_offset = file.View.ReadInt32 (0x1C) - index_offset;
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int segment_table = file.View.ReadInt32 (0x24) - index_offset;
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uint base_offset = file.View.ReadUInt32 (0x2C);
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if (0 == alignment || index_offset <= 0 || names_offset <= 0 || segment_table <= 0)
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return null;
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if (!file.View.AsciiEqual (index_offset, "tZ"))
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return null;
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byte[] index;
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using (var packed = file.CreateStream (index_offset, index_length))
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using (var tz = new TzCompression (packed))
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index = tz.Unpack();
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int current_offset = 0;
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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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int name_pos = ReadInt24 (index, current_offset) * 2;
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int name_length = index[current_offset+3];
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int chunk_count = index[current_offset+4];
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int offset = ReadInt24 (index, current_offset+5);
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var name = Binary.GetCString (index, names_offset + name_pos, name_length);
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var entry = FormatCatalog.Instance.Create<Arc4Entry> (name);
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entry.Segments = new List<long> (chunk_count);
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if (chunk_count > 1)
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{
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int segment_pos = segment_table + 3 * offset;
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for (int j = 0; j < chunk_count; ++j)
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{
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entry.Segments.Add (ReadInt24 (index, segment_pos) + base_offset);
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segment_pos += 3;
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}
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}
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else
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entry.Segments.Add (offset + base_offset);
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for (int j = 0; j < chunk_count; ++j)
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entry.Segments[j] *= alignment;
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dir.Add (entry);
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current_offset += 8;
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}
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foreach (Arc4Entry entry in dir)
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{
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uint size = 0;
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foreach (var segment in entry.Segments)
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{
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size += Binary.BigEndian (file.View.ReadUInt32 (segment+4));
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}
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entry.Offset = entry.Segments[0] + 0x10;
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entry.Size = size;
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entry.IsPacked = file.View.AsciiEqual (entry.Offset, "tZ");
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if (entry.IsPacked)
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entry.UnpackedSize = file.View.ReadUInt32 (entry.Offset+2);
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else
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entry.UnpackedSize = size;
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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 xent = (Arc4Entry)entry;
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Stream input;
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if (1 == xent.Segments.Count)
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input = arc.File.CreateStream (entry.Offset, entry.Size);
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else
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input = new Arc4Stream (arc.File, xent);
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if (!xent.IsPacked)
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return input;
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using (input)
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using (var tz = new TzCompression (input))
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return new MemoryStream (tz.Unpack());
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}
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static int ReadInt24 (byte[] data, int pos)
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{
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return data[pos] << 16 | data[pos+1] << 8 | data[pos+2];
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}
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}
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internal sealed class TzCompression : IDisposable
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{
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BinaryReader m_input;
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public TzCompression (Stream stream)
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{
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m_input = new ArcView.Reader (stream);
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}
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public byte[] Unpack ()
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{
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int signature = m_input.ReadUInt16();
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uint unpacked_size = m_input.ReadUInt32();
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var data = new byte[unpacked_size];
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int dst = 0;
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var buffer = new byte[0x10000];
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while (dst < data.Length)
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{
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signature = m_input.ReadUInt16();
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ushort block_size = m_input.ReadUInt16();
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ushort unpacked_block_size = m_input.ReadUInt16();
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if (0 == unpacked_block_size)
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throw new InvalidFormatException();
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ushort key = m_input.ReadUInt16();
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if (block_size != m_input.Read (buffer, 0, block_size))
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throw new EndOfStreamException();
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DecryptBlock (buffer, 0, block_size, key);
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if (0x7453 == signature) // 'St'
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Buffer.BlockCopy (buffer, 0, data, dst, unpacked_block_size);
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else if (0x745A == signature) // 'Zt'
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UnpackBlock (buffer, 0, block_size, data, dst, unpacked_block_size);
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else
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throw new InvalidFormatException();
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dst += unpacked_block_size;
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}
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return data;
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}
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unsafe void DecryptBlock (byte[] data, int pos, int count, uint key)
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{
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fixed (byte* data8 = &data[pos])
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{
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ushort* data16 = (ushort*)data8;
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for (int i = count / 2; i > 0; --i)
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{
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key *= 0x1465D9;
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key += 0x0FB5;
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*data16++ -= (ushort)(key >> 16);
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}
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}
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}
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void UnpackBlock (byte[] input, int src, int input_size,
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byte[] output, int dst, int output_size)
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{
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int src_end = src + input_size;
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while (src < src_end)
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{
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int ctl = input[src++];
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if (0 == ctl)
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break;
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if (0 != (ctl & 0x80))
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{
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int offset, count;
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if (0 != (ctl & 0x40))
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{
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if (0 != (ctl & 0x20))
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{
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ctl = (ctl << 8) | input[src++];
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ctl = (ctl << 8) | input[src++];
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count = (ctl & 0x3F) + 4;
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offset = (ctl >> 6) & 0x7FFF;
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}
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else
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{
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ctl = (ctl << 8) | input[src++];
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count = (ctl & 7) + 3;
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offset = (ctl >> 3) & 0x3FF;
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}
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}
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else
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{
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count = (ctl & 3) + 2;
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offset = (ctl >> 2) & 0xF;
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}
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++offset;
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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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else
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{
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Buffer.BlockCopy (input, src, output, dst, ctl);
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src += ctl;
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dst += ctl;
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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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}
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#endregion
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}
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internal class Arc4Stream : Stream
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{
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ArcView m_file;
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IEnumerator<long> m_segment;
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Stream m_stream;
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bool m_eof = false;
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public override bool CanRead { get { return !_disposed; } }
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public override bool CanSeek { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public override long Length { get { throw new NotSupportedException ("Arc4Stream.Length not supported"); } }
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public override long Position
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{
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get { throw new NotSupportedException ("Arc4Stream.Position not supported."); }
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set { throw new NotSupportedException ("Arc4Stream.Position not supported."); }
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}
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public Arc4Stream (ArcView file, Arc4Entry entry)
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{
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m_file = file;
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m_segment = entry.Segments.GetEnumerator();
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NextSegment();
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}
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private void NextSegment ()
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{
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if (!m_segment.MoveNext())
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{
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m_eof = true;
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return;
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}
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var prev_stream = m_stream;
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long offset = m_segment.Current;
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var segment_size = Binary.BigEndian (m_file.View.ReadUInt32 (offset+4));
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m_stream = m_file.CreateStream (offset+0x10, segment_size);
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if (null != prev_stream)
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prev_stream.Dispose();
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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int total = 0;
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while (!m_eof && count > 0)
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{
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int read = m_stream.Read (buffer, offset, count);
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if (0 != read)
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{
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total += read;
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offset += read;
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count -= read;
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}
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if (0 != count)
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NextSegment();
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}
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return total;
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}
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public override int ReadByte ()
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{
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int b = -1;
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while (!m_eof)
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{
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b = m_stream.ReadByte();
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if (-1 != b)
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break;
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NextSegment();
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}
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return b;
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}
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public override void Flush ()
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{
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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throw new NotSupportedException ("Arc4Stream.Seek method is not supported");
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}
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public override void SetLength (long length)
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{
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throw new NotSupportedException ("Arc4Stream.SetLength method is not supported");
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}
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public override void Write (byte[] buffer, int offset, int count)
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{
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throw new NotSupportedException ("Arc4Stream.Write method is not supported");
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}
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public override void WriteByte (byte value)
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{
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throw new NotSupportedException("Arc4Stream.WriteByte method is not supported");
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}
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#region IDisposable Members
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bool _disposed = false;
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protected override void Dispose (bool disposing)
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{
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if (!_disposed)
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{
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if (disposing)
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{
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if (null != m_stream)
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m_stream.Dispose();
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m_segment.Dispose();
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}
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_disposed = true;
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base.Dispose (disposing);
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}
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}
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#endregion
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}
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}
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