GARbro-mirror/ArcFormats/Seraphim/ArcSCN.cs

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//! \file ArcSCN.cs
//! \date 2017 Nov 25
//! \brief Seraphim 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.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
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using GameRes.Compression;
using GameRes.Utility;
namespace GameRes.Formats.Seraphim
{
[Export(typeof(ArchiveFormat))]
public class ScnOpener : ArchiveFormat
{
public override string Tag { get { return "SERAPH/SCN"; } }
public override string Description { get { return "Seraphim engine scripts archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public ScnOpener ()
{
Extensions = new string[] { "dat" };
}
public override ArcFile TryOpen (ArcView file)
{
if (!VFS.IsPathEqualsToFileName (file.Name, "SCNPAC.DAT"))
return null;
int count = file.View.ReadInt32 (0);
if (!IsSaneCount (count))
return null;
uint index_size = 4 * (uint)count;
if (index_size > file.View.Reserve (4, index_size))
return null;
int index_offset = 4;
uint next_offset = file.View.ReadUInt32 (index_offset);
if (next_offset < index_offset + index_size)
return null;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
index_offset += 4;
var entry = new Entry { Name = i.ToString ("D5"), Type = "script" };
entry.Offset = next_offset;
next_offset = file.View.ReadUInt32 (index_offset);
if (next_offset < entry.Offset || next_offset > file.MaxOffset)
return null;
entry.Size = next_offset - (uint)entry.Offset;
dir.Add (entry);
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
if (0 == entry.Size)
return Stream.Null;
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uint signature = arc.File.View.ReadUInt32 (entry.Offset);
ArcViewStream input;
if (1 == signature && 0x78 == arc.File.View.ReadByte (entry.Offset+4))
{
input = arc.File.CreateStream (entry.Offset+4, entry.Size-4);
return new ZLibStream (input, CompressionMode.Decompress);
}
input = arc.File.CreateStream (entry.Offset, entry.Size);
if (signature < 4 || 0 != (signature & 0xFF000000))
return input;
try
{
var data = LzDecompress (input);
input.Dispose();
return new BinMemoryStream (data, entry.Name);
}
catch
{
input.Position = 0;
return input;
}
}
internal byte[] LzDecompress (IBinaryStream input)
{
int unpacked_size = input.ReadInt32();
var data = new byte[unpacked_size];
int dst = 0;
while (dst < unpacked_size)
{
int ctl = input.ReadByte();
if (-1 == ctl)
throw new EndOfStreamException();
if (0 != (ctl & 0x80))
{
byte lo = input.ReadUInt8();
int offset = ((ctl << 3 | lo >> 5) & 0x3FF) + 1;
int count = (lo & 0x1F) + 1;
Binary.CopyOverlapped (data, dst-offset, dst, count);
dst += count;
}
else
{
int count = ctl + 1;
if (input.Read (data, dst, count) != count)
throw new EndOfStreamException();
dst += count;
}
}
return data;
}
}
}