GARbro-mirror/ArcFormats/Silky/ArcAi6Win.cs

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//! \file ArcAi6Win.cs
//! \date Sat Nov 28 12:44:51 2015
//! \brief Ai6Win engine resource archive
//
// 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.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Compression;
using GameRes.Utility;
namespace GameRes.Formats.Silky
{
[Export(typeof(ArchiveFormat))]
public class Ai6Opener : ArchiveFormat
{
public override string Tag { get { return "ARC/AI6WIN"; } }
public override string Description { get { return "AI6WIN engine resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public Ai6Opener ()
{
Extensions = new string[] { "arc" };
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (0);
if (!IsSaneCount (count))
return null;
long index_offset = 4;
uint index_size = (uint)(count * (0x104 + 8));
if (index_size > file.View.Reserve (index_offset, index_size))
return null;
var name_buffer = new byte[0x104];
var dir = new List<Entry>();
for (int i = 0; i < count; ++i)
{
file.View.Read (index_offset, name_buffer, 0, (uint)name_buffer.Length);
int name_length = 0;
while (name_length < name_buffer.Length && 0 != name_buffer[name_length])
++name_length;
if (0 == name_length)
return null;
byte key = (byte)(name_length+1);
for (int j = 0; j < name_length; ++j)
{
name_buffer[j] -= key--;
if (name_buffer[j] < 0x20)
return null;
}
var name = Encodings.cp932.GetString (name_buffer, 0, name_length);
index_offset += 0x104;
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.Size = Binary.BigEndian (file.View.ReadUInt32 (index_offset));
entry.UnpackedSize = Binary.BigEndian (file.View.ReadUInt32 (index_offset+4));
entry.Offset = Binary.BigEndian (file.View.ReadUInt32 (index_offset+8));
if (entry.Offset < index_size+4 || !entry.CheckPlacement (file.MaxOffset))
return null;
entry.IsPacked = entry.Size != entry.UnpackedSize;
dir.Add (entry);
index_offset += 12;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pent = entry as PackedEntry;
if (null == pent || !pent.IsPacked)
return base.OpenEntry (arc, entry);
var input = arc.File.CreateStream (entry.Offset, entry.Size);
return new LzssStream (input);
}
}
}