mirror of
https://github.com/crskycode/GARbro.git
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232 lines
8.4 KiB
C#
232 lines
8.4 KiB
C#
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//! \file ArcLAX.cs
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//! \date 2017 Dec 31
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//! \brief Lambda engine resource archive.
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//
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// Copyright (C) 2017 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.Lambda
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{
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[Export(typeof(ArchiveFormat))]
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public class LaxOpener : ArchiveFormat
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{
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public override string Tag { get { return "LAX"; } }
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public override string Description { get { return "Lambda engine resource archive"; } }
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public override uint Signature { get { return 0x70614C24; } } // '$LapH__'
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public override bool IsHierarchic { get { return true; } }
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public override bool CanWrite { get { return false; } }
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public override ArcFile TryOpen (ArcView file)
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{
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long index_offset = file.MaxOffset-0x28;
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if (!file.View.AsciiEqual (index_offset, "$LapI__"))
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return null;
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int count = file.View.ReadInt32 (index_offset+8);
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if (!IsSaneCount (count))
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return null;
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uint unpacked_size = file.View.ReadUInt32 (index_offset+0x10);
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uint packed_size = file.View.ReadUInt32 (index_offset+0x14);
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index_offset = file.View.ReadUInt32 (index_offset+0xC);
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var index = new byte[unpacked_size];
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using (var input = file.CreateStream (index_offset, packed_size))
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using (var lax = new LaxStream (input))
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lax.Read (index, 0, index.Length);
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uint data_offset = 8;
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int entry_length = 0x128;
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int pos = 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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if (!index.AsciiEqual (pos, "$LapF__"))
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return null;
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var name = Binary.GetCString (index, pos+0x24, 0x104);
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var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
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entry.UnpackedSize = index.ToUInt32 (pos+0x10);
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entry.Size = index.ToUInt32 (pos+0x14);
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entry.Offset = index.ToUInt32 (pos+0x18) + data_offset;
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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if (name.HasExtension (".bmx"))
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entry.Type = "image";
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dir.Add (entry);
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pos += entry_length;
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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 input = arc.File.CreateStream (entry.Offset, entry.Size);
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return new LaxStream (input);
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}
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}
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internal class LaxStream : InputProxyStream
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{
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public LaxStream (Stream input, bool leave_open = false) : base (input, leave_open)
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{
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}
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byte[] m_buffer;
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int m_buffer_size;
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int m_buffer_pos;
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public override int Read (byte[] buffer, int offset, int count)
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{
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int total_read = 0;
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while (count > 0)
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{
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if (m_buffer_pos == m_buffer_size)
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{
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if (m_eof)
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break;
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ReadSegment();
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}
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int available = Math.Min (count, m_buffer_size - m_buffer_pos);
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Buffer.BlockCopy (m_buffer, m_buffer_pos, buffer, offset, available);
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m_buffer_pos += available;
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offset += available;
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count -= available;
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total_read += available;
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}
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return total_read;
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}
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bool m_eof = false;
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void ReadSegment ()
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{
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if (null == m_buffer)
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m_buffer = new byte[0x8000];
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m_buffer_pos = m_buffer_size = 0;
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long chunk_start = BaseStream.Position;
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if (BaseStream.Read (m_buffer, 0, 10) < 10)
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{
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m_eof = true;
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return;
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}
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if (!m_buffer.AsciiEqual ("_AF"))
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throw new InvalidFormatException ("Invalid compressed LAX stream.");
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int chunk_size = m_buffer.ToUInt16 (4);
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int final_size = m_buffer.ToUInt16 (6);
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if (final_size != 0)
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throw new NotImplementedException ("Double compression in LAX streams not implemented.");
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int unpacked_size = m_buffer.ToUInt16 (8);
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if (unpacked_size > m_buffer.Length)
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m_buffer = new byte[unpacked_size];
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int method = m_buffer[3];
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switch (method) // compression method
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{
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case '1':
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m_buffer_size = LzssUnpack (unpacked_size);
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break;
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case '2':
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m_buffer_size = HuffmanUnpack (unpacked_size);
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break;
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default:
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m_buffer_size = BaseStream.Read (m_buffer, 0, unpacked_size);
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break;
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}
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BaseStream.Position = chunk_start + chunk_size;
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}
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byte[] m_frame = new byte[0x1000];
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int LzssUnpack (int unpacked_size)
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{
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for (int i = 0; i < m_frame.Length; ++i)
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m_frame[i] = 0;
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int frame_pos = 0xFEE;
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int bits = 2;
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int dst = 0;
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while (dst < unpacked_size)
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{
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bits >>= 1;
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if (1 == bits)
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{
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bits = BaseStream.ReadByte();
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if (-1 == bits)
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break;
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bits |= 0x100;
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}
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int lo = BaseStream.ReadByte();
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if (-1 == lo)
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break;
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if (0 != (bits & 1))
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{
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m_buffer[dst++] = m_frame[frame_pos++ & 0xFFF] = (byte)lo;
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}
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else
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{
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int hi = BaseStream.ReadByte();
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if (-1 == hi)
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break;
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int offset = (hi & 0xF0) << 4 | lo;
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int count = Math.Min (3 + (hi & 0xF), unpacked_size - dst);
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while (count --> 0)
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{
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byte v = m_frame[offset++ & 0xFFF];
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m_buffer[dst++] = m_frame[frame_pos++ & 0xFFF] = v;
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}
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}
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}
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return dst;
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}
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int HuffmanUnpack (int unpacked_size)
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{
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throw new NotImplementedException ("LAX compression method 2 not implemented.");
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}
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#region IO.Stream members
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public override bool CanSeek { get { return false; } }
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public override long Length
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{
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get { throw new NotSupportedException ("Stream.Length property is not supported"); }
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}
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public override long Position
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{
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get { throw new NotSupportedException ("Stream.Position property is not supported"); }
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set { throw new NotSupportedException ("Stream.Position property is not supported"); }
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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 ("LzssStream.Seek method is not supported");
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}
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#endregion
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}
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}
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