GARbro-mirror/ArcFormats/Mixwill/ArcARC0.cs

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//! \file ArcARC0.cs
//! \date Sat Jan 14 23:23:37 2017
//! \brief Mixwill soft resource 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;
namespace GameRes.Formats.Mixwill
{
[Export(typeof(ArchiveFormat))]
public class Arc0Opener : ArchiveFormat
{
public override string Tag { get { return "ARC0"; } }
public override string Description { get { return "Mixwill soft resource archive"; } }
public override uint Signature { get { return 0x30435241; } } // 'ARC0'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public Arc0Opener ()
{
Extensions = new string[] { "arc" };
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (0x10004);
if (!IsSaneCount (count))
return null;
var name_buf = new byte[0x100];
uint index_offset = 0x10008;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
if (0x100 != file.View.Read (index_offset, name_buf, 0, 0x100))
return null;
int n;
for (n = 0; n < 0x100; ++n)
{
name_buf[n] ^= (byte)n;
if (0 == name_buf[n])
break;
}
if (0 == n)
return null;
index_offset += 0x100;
var name = Encodings.cp932.GetString (name_buf, 0, n);
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Size = file.View.ReadUInt32 (index_offset);
entry.Offset = file.View.ReadUInt32 (index_offset+4);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 8;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
uint encrypted_size = entry.Size;
if (!entry.Name.EndsWith (".txt", StringComparison.InvariantCultureIgnoreCase)
&& encrypted_size > 0x100)
encrypted_size = 0x100;
var prefix = arc.File.View.ReadBytes (entry.Offset, encrypted_size);
for (int i = 0; i < prefix.Length; ++i)
prefix[i] ^= (byte)i;
if (entry.Size == encrypted_size)
return new BinMemoryStream (prefix, entry.Name);
var rest = arc.File.CreateStream (entry.Offset+encrypted_size, entry.Size-encrypted_size);
return new PrefixStream (prefix, rest);
}
}
}