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implemented LAX archives.

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morkt 2018-01-02 07:00:58 +04:00
parent 4631caa346
commit 9b9d91a954
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ArcFormats/Lambda/ArcLAX.cs Normal file
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//! \file ArcLAX.cs
//! \date 2017 Dec 31
//! \brief Lambda engine resource archive.
//
// Copyright (C) 2017 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Utility;
namespace GameRes.Formats.Lambda
{
[Export(typeof(ArchiveFormat))]
public class LaxOpener : ArchiveFormat
{
public override string Tag { get { return "LAX"; } }
public override string Description { get { return "Lambda engine resource archive"; } }
public override uint Signature { get { return 0x70614C24; } } // '$LapH__'
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
long index_offset = file.MaxOffset-0x28;
if (!file.View.AsciiEqual (index_offset, "$LapI__"))
return null;
int count = file.View.ReadInt32 (index_offset+8);
if (!IsSaneCount (count))
return null;
uint unpacked_size = file.View.ReadUInt32 (index_offset+0x10);
uint packed_size = file.View.ReadUInt32 (index_offset+0x14);
index_offset = file.View.ReadUInt32 (index_offset+0xC);
var index = new byte[unpacked_size];
using (var input = file.CreateStream (index_offset, packed_size))
using (var lax = new LaxStream (input))
lax.Read (index, 0, index.Length);
uint data_offset = 8;
int entry_length = 0x128;
int pos = 0;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
if (!index.AsciiEqual (pos, "$LapF__"))
return null;
var name = Binary.GetCString (index, pos+0x24, 0x104);
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.UnpackedSize = index.ToUInt32 (pos+0x10);
entry.Size = index.ToUInt32 (pos+0x14);
entry.Offset = index.ToUInt32 (pos+0x18) + data_offset;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
if (name.HasExtension (".bmx"))
entry.Type = "image";
dir.Add (entry);
pos += entry_length;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var input = arc.File.CreateStream (entry.Offset, entry.Size);
return new LaxStream (input);
}
}
internal class LaxStream : InputProxyStream
{
public LaxStream (Stream input, bool leave_open = false) : base (input, leave_open)
{
}
byte[] m_buffer;
int m_buffer_size;
int m_buffer_pos;
public override int Read (byte[] buffer, int offset, int count)
{
int total_read = 0;
while (count > 0)
{
if (m_buffer_pos == m_buffer_size)
{
if (m_eof)
break;
ReadSegment();
}
int available = Math.Min (count, m_buffer_size - m_buffer_pos);
Buffer.BlockCopy (m_buffer, m_buffer_pos, buffer, offset, available);
m_buffer_pos += available;
offset += available;
count -= available;
total_read += available;
}
return total_read;
}
bool m_eof = false;
void ReadSegment ()
{
if (null == m_buffer)
m_buffer = new byte[0x8000];
m_buffer_pos = m_buffer_size = 0;
long chunk_start = BaseStream.Position;
if (BaseStream.Read (m_buffer, 0, 10) < 10)
{
m_eof = true;
return;
}
if (!m_buffer.AsciiEqual ("_AF"))
throw new InvalidFormatException ("Invalid compressed LAX stream.");
int chunk_size = m_buffer.ToUInt16 (4);
int final_size = m_buffer.ToUInt16 (6);
if (final_size != 0)
throw new NotImplementedException ("Double compression in LAX streams not implemented.");
int unpacked_size = m_buffer.ToUInt16 (8);
if (unpacked_size > m_buffer.Length)
m_buffer = new byte[unpacked_size];
int method = m_buffer[3];
switch (method) // compression method
{
case '1':
m_buffer_size = LzssUnpack (unpacked_size);
break;
case '2':
m_buffer_size = HuffmanUnpack (unpacked_size);
break;
default:
m_buffer_size = BaseStream.Read (m_buffer, 0, unpacked_size);
break;
}
BaseStream.Position = chunk_start + chunk_size;
}
byte[] m_frame = new byte[0x1000];
int LzssUnpack (int unpacked_size)
{
for (int i = 0; i < m_frame.Length; ++i)
m_frame[i] = 0;
int frame_pos = 0xFEE;
int bits = 2;
int dst = 0;
while (dst < unpacked_size)
{
bits >>= 1;
if (1 == bits)
{
bits = BaseStream.ReadByte();
if (-1 == bits)
break;
bits |= 0x100;
}
int lo = BaseStream.ReadByte();
if (-1 == lo)
break;
if (0 != (bits & 1))
{
m_buffer[dst++] = m_frame[frame_pos++ & 0xFFF] = (byte)lo;
}
else
{
int hi = BaseStream.ReadByte();
if (-1 == hi)
break;
int offset = (hi & 0xF0) << 4 | lo;
int count = Math.Min (3 + (hi & 0xF), unpacked_size - dst);
while (count --> 0)
{
byte v = m_frame[offset++ & 0xFFF];
m_buffer[dst++] = m_frame[frame_pos++ & 0xFFF] = v;
}
}
}
return dst;
}
int HuffmanUnpack (int unpacked_size)
{
throw new NotImplementedException ("LAX compression method 2 not implemented.");
}
#region IO.Stream members
public override bool CanSeek { get { return false; } }
public override long Length
{
get { throw new NotSupportedException ("Stream.Length property is not supported"); }
}
public override long Position
{
get { throw new NotSupportedException ("Stream.Position property is not supported"); }
set { throw new NotSupportedException ("Stream.Position property is not supported"); }
}
public override void Flush()
{
}
public override long Seek (long offset, SeekOrigin origin)
{
throw new NotSupportedException ("LzssStream.Seek method is not supported");
}
#endregion
}
}