GARbro-mirror/ArcFormats/SuperNekoX/ArcGPC.cs

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//! \file ArcGPC.cs
//! \date Tue Mar 22 01:38:13 2016
//! \brief Super Neko X engine resource archive.
//
// Copyright (C) 2016 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 System.Linq;
using GameRes.Utility;
namespace GameRes.Formats.SuperNekoX
{
[Export(typeof(ArchiveFormat))]
public class GpcOpener : ArchiveFormat
{
public override string Tag { get { return "GPC7"; } }
public override string Description { get { return "Super NekoX engine resource archive"; } }
public override uint Signature { get { return 0x37637047; } } // 'Gpc7'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
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public GpcOpener ()
{
Extensions = new string[] { "gpc" };
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (4);
if (!IsSaneCount (count))
return null;
var base_name = Path.GetFileNameWithoutExtension (file.Name);
var dir = new List<Entry> (count);
int index_offset = 8;
long data_offset = count * 4 + 8;
uint next_offset = file.View.ReadUInt32 (index_offset);
for (int i = 0; i < count; ++i)
{
index_offset += 4;
var entry = new PackedEntry { Offset = next_offset };
next_offset = i + 1 < count ? file.View.ReadUInt32 (index_offset) : (uint)file.MaxOffset;
entry.Size = next_offset - (uint)entry.Offset;
if (entry.Offset < data_offset || !entry.CheckPlacement (file.MaxOffset))
return null;
entry.Name = string.Format ("{0}#{1:D4}", base_name, i);
dir.Add (entry);
}
DetectFileTypes (file, dir);
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pent = entry as PackedEntry;
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IBinaryStream input = arc.File.CreateStream (entry.Offset, entry.Size, entry.Name);
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if (null != pent && pent.IsPacked)
{
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IBinaryStream unpacked;
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using (input)
{
var data = new byte[pent.UnpackedSize];
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UnpackEntry (input.AsStream, data);
unpacked = new BinMemoryStream (data, entry.Name);
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}
input = unpacked;
}
if (input.Length > 4 && input.Length < 0x10000)
{
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int unpacked_size = input.ReadUInt16();
int packed_size = input.ReadUInt16();
if (packed_size == input.Length-4)
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{
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using (input)
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{
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var data = new byte[unpacked_size];
UnpackLz77 (input.AsStream, data);
return new BinMemoryStream (data, entry.Name);
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}
}
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input.Position = 0;
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}
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return input.AsStream;
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}
void DetectFileTypes (ArcView file, List<Entry> dir)
{
using (var input = file.CreateStream())
using (var reader = new ArcView.Reader (input))
{
var buffer = new byte[0x10];
foreach (PackedEntry entry in dir)
{
input.Position = entry.Offset;
uint packed_size = reader.ReadUInt32();
entry.UnpackedSize = reader.ReadUInt32();
entry.Offset += 8;
if (0 == packed_size)
{
entry.Size = entry.UnpackedSize;
}
else
{
entry.IsPacked = true;
entry.Size = packed_size;
}
if (entry.Size < 0x10)
continue;
uint signature;
if (entry.IsPacked)
{
UnpackEntry (input, buffer);
signature = LittleEndian.ToUInt32 (buffer, 0);
}
else
signature = reader.ReadUInt32();
IResource res;
if (0x020000 == signature || 0x0A0000 == signature)
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res = ImageFormat.Tga;
else
res = AutoEntry.DetectFileType (signature);
if (null != res)
{
entry.Type = res.Type;
var ext = res.Extensions.FirstOrDefault();
if (!string.IsNullOrEmpty (ext))
entry.Name = Path.ChangeExtension (entry.Name, ext);
}
}
}
}
void UnpackEntry (Stream input, byte[] output)
{
int dst = 0;
while (dst < output.Length)
{
int ctl = input.ReadByte();
if (-1 == ctl)
break;
int count, offset;
if (ctl >= 0x20)
{
if (ctl >= 0x80)
{
count = (ctl >> 5) & 3;
offset = (ctl & 0x1F) << 8;
offset |= input.ReadByte();
}
else if ((ctl & 0x60) == 0x20)
{
offset = (ctl >> 2) & 7;
count = ctl & 3;
}
else if ((ctl & 0x60) == 0x40)
{
offset = (ctl & 0x1F) << 8;
offset |= input.ReadByte();
count = input.ReadByte() + 4;
}
else
{
offset = (ctl & 0x1F) << 8 | input.ReadByte();
count = input.ReadByte() << 24;
count |= input.ReadByte() << 16;
count |= input.ReadByte() << 8;
count |= input.ReadByte();
}
count = Math.Min (count + 3, output.Length-dst);
Binary.CopyOverlapped (output, dst-offset-1, dst, count);
}
else
{
if (ctl < 0x1D)
{
count = ctl + 1;
}
else if (0x1D == ctl)
{
count = input.ReadByte() + 0x1E;
}
else if (0x1E == ctl)
{
count = input.ReadByte() << 8;
count |= input.ReadByte();
count += 286;
}
else
{
count = input.ReadByte() << 24;
count |= input.ReadByte() << 16;
count |= input.ReadByte() << 8;
count |= input.ReadByte();
}
count = Math.Min (count, output.Length-dst);
input.Read (output, dst, count);
}
dst += count;
}
}
void UnpackLz77 (Stream input, byte[] output)
{
int dst = 0;
int mask = 0;
int bits = 0;
while (dst < output.Length)
{
mask >>= 1;
if (0 == mask)
{
bits = input.ReadByte();
if (-1 == bits)
break;
mask = 0x80;
}
if (0 != (bits & mask))
{
int count = input.ReadByte();
int offset = input.ReadByte() << 4 | count >> 4;
count = Math.Min ((count & 0xf) + 3, output.Length - dst);
Binary.CopyOverlapped (output, dst-offset-1, dst, count);
dst += count;
}
else
{
output[dst++] = (byte)input.ReadByte();
}
}
}
}
}