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FVP engine archive implementation.

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morkt 2015-02-26 08:18:11 +04:00
parent 4636ddf8c3
commit ccb903a673
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ArcFormats/ArcFVP.cs Normal file
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//! \file ArcFVP.cs
//! \date Sat Feb 07 23:23:02 2015
//! \brief Favorit View Point system engine archive implementation.
//
// Copyright (C) 2015 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.FVP
{
[Export(typeof(ArchiveFormat))]
public class BinOpener : ArchiveFormat
{
public override string Tag { get { return "FVP"; } }
public override string Description { get { return "FVP engine resource archive"; } }
public override uint Signature { get { return 0x58504341; } } // "ACPX"
public override bool IsHierarchic { get { return false; } }
public override bool CanCreate { get { return false; } }
public BinOpener ()
{
Extensions = new string[] { "bin" };
}
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (4, "PK01"))
return null;
int count = file.View.ReadInt32 (8);
if (count <= 0 || count > 0xfffff)
return null;
long index_offset = 0x0c;
uint index_size = (uint)(0x28 * count);
if (index_size > file.View.Reserve (index_offset, index_size))
return null;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
string name = file.View.ReadString (index_offset, 0x20);
var entry = FormatCatalog.Instance.CreateEntry (name);
entry.Offset = file.View.ReadUInt32 (index_offset+0x20);
entry.Size = file.View.ReadUInt32 (index_offset+0x24);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 0x28;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var entry_offset = entry.Offset;
var input = new ArcView.Frame (arc.File, entry_offset, entry.Size);
try
{
if (entry.Size > 8 && input.AsciiEqual (entry_offset, "acp\0"))
{
using (var decoder = new LzwDecoder (input))
{
decoder.Unpack();
return new MemoryStream (decoder.Output, false);
}
}
return new ArcView.ArcStream (input);
}
catch
{
input.Dispose();
throw;
}
}
}
internal sealed class LzwDecoder : IDisposable
{
private Stream m_input;
private byte[] m_output;
public byte[] Output { get { return m_output; } }
uint m_dst_size;
public LzwDecoder (ArcView.Frame input)
{
m_dst_size = Binary.BigEndian (input.ReadUInt32 (input.Offset+4));
m_input = new ArcView.ArcStream (input, input.Offset+8, input.Reserved-8);
m_output = new byte[m_dst_size];
}
public void Unpack ()
{
int dst = 0;
int bits = 0;
var buf = new int[0x8c00];
uint L0 = 0x800000;
uint edx = 0x102;
for (;;)
{
uint eax = L0;
bool hi = false;
while (!hi)
{
bits <<= 1;
if (0 == (bits&0xff))
{
bits = m_input.ReadByte();
if (-1 == bits)
throw new EndOfStreamException ("Invalid compressed stream");
bits = (bits << 1) | 1;
}
bool carry = 0 != (bits & 0x100);
hi = 0 != (eax & 0x80000000);
eax = (eax << 1) | (carry ? 1u : 0u);
}
if (0x100 == (eax & 0xff00) && 2 >= (eax & 0xff))
{
uint ecx = L0;
if (2 == (eax & 0xff))
{
L0 = 0x800000;
edx = 0x102;
continue;
}
if (0 == (eax & 0xff))
break;
ecx >>= 1;
if (0 != (ecx & 0xff00))
throw new EndOfStreamException ("Invalid compressed stream");
L0 = ecx;
continue;
}
++edx;
if (edx >= 0x8c00)
throw new EndOfStreamException ("Invalid compressed stream");
buf[edx] = dst;
if (0 == (eax & 0xff00))
{
if (0 == m_dst_size--)
throw new EndOfStreamException ("Invalid compressed stream");
m_output[dst++] = (byte)(eax & 0xff);
}
else
{
if (eax >= edx)
throw new EndOfStreamException ("Invalid compressed stream");
int src = buf[eax];
int count = buf[eax+1] - src + 1;
if (m_dst_size < count)
throw new EndOfStreamException ("Invalid compressed stream");
m_dst_size -= (uint)count;
Binary.CopyOverlapped (m_output, src, dst, count);
dst += count;
}
}
}
#region IDisposable Members
public void Dispose ()
{
if (null != m_input)
{
m_input.Dispose();
m_input = null;
}
GC.SuppressFinalize (this);
}
#endregion
}
}