GARbro-mirror/ArcFormats/ArcDRS.cs

93 lines
3.8 KiB
C#

//! \file ArcDRS.cs
//! \date Thu Aug 21 06:11:09 2014
//! \brief Digital Romance System archive implementation.
//
// Copyright (C) 2014 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.IO;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using GameRes.Formats.Strings;
namespace GameRes.Formats.DRS
{
[Export(typeof(ArchiveFormat))]
public class DrsOpener : ArchiveFormat
{
public override string Tag { get { return "DRS"; } }
public override string Description { get { return "Digital Romance System resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanCreate { get { return false; } }
public DrsOpener ()
{
Extensions = Enumerable.Empty<string>(); // DRS archives have no extensions
}
public override ArcFile TryOpen (ArcView file)
{
if (file.MaxOffset > uint.MaxValue)
return null;
int dir_size = file.View.ReadUInt16 (0);
if (dir_size < 0x20 || 0 != (dir_size & 0xf) || dir_size + 2 >= file.MaxOffset)
return null;
byte first = file.View.ReadByte (2);
if (0 == first)
return null;
file.View.Reserve (0, (uint)dir_size + 2);
int dir_offset = 2;
uint next_offset = file.View.ReadUInt32 (dir_offset+12);
if (next_offset > file.MaxOffset || next_offset < dir_size+2)
return null;
var encoding = Encodings.cp932.WithFatalFallback();
byte[] name_raw = new byte[12];
int count = dir_size / 0x10 - 1;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
file.View.Read (dir_offset, name_raw, 0, 12);
int name_length = name_raw.Length;
while (name_length > 0 && 0 == name_raw[name_length-1])
--name_length;
if (0 == name_length)
return null;
uint offset = next_offset;
dir_offset += 0x10;
next_offset = file.View.ReadUInt32 (dir_offset+12);
if (next_offset > file.MaxOffset || next_offset < offset)
return null;
string name = encoding.GetString (name_raw, 0, name_length).ToLowerInvariant();
var entry = FormatCatalog.Instance.CreateEntry (name);
entry.Offset = offset;
entry.Size = next_offset - offset;
dir.Add (entry);
}
return new ArcFile (file, this, dir);
}
}
}