GARbro-mirror/ArcFormats/RealLive/ArcSEEN.cs

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//! \file ArcSEEN.cs
//! \date 2017 Nov 22
//! \brief AVG32 engine scripts 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.RealLive
{
[Export(typeof(ArchiveFormat))]
public class SeenOpener : ArchiveFormat
{
public override string Tag { get { return "SEEN"; } }
public override string Description { get { return "AVG32 engine scripts archive"; } }
public override uint Signature { get { return 0x4C434150; } } // 'PACL'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public SeenOpener ()
{
Extensions = new string[] { "" };
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (0x10);
if (!IsSaneCount (count))
return null;
uint index_offset = 0x20;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name = file.View.ReadString (index_offset, 0x10);
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.Offset = file.View.ReadUInt32 (index_offset+0x10);
entry.Size = file.View.ReadUInt32 (index_offset+0x14);
entry.UnpackedSize = file.View.ReadUInt32 (index_offset+0x18);
entry.IsPacked = file.View.ReadUInt32 (index_offset+0x1C) != 0;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 0x20;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var input = arc.File.CreateStream (entry.Offset, entry.Size);
var pent = entry as PackedEntry;
if (null == pent || !pent.IsPacked || input.Signature != 0x4B434150) // 'PACK'
return input;
using (input)
{
input.Position = 8;
int unpacked_size = input.ReadInt32();
var output = new byte[unpacked_size];
input.Position = 0x10;
LzDecompress (input, output);
return new BinMemoryStream (output, entry.Name);
}
}
internal static void LzDecompress (IBinaryStream input, byte[] output)
{
int dst = 0;
int bits = 0;
int mask = 0;
while (dst < output.Length)
{
mask >>= 1;
if (0 == mask)
{
bits = input.ReadUInt8();
mask = 0x80;
}
if (0 != (bits & mask))
{
output[dst++] = input.ReadUInt8();
}
else
{
int offset = input.ReadUInt16();
int count = (offset & 0xF) + 2;
offset >>= 4;
Binary.CopyOverlapped (output, dst-offset, dst, count);
dst += count;
}
}
}
}
}