GARbro-mirror/ArcFormats/Cadath/ArcDAF.cs

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//! \file ArcDAF.cs
//! \date Thu Feb 23 01:26:17 2017
//! \brief Cadath resource archive format.
//
// 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;
using GameRes.Compression;
using GameRes.Utility;
namespace GameRes.Formats.Cadath
{
[Export(typeof(ArchiveFormat))]
public class DafOpener : ArchiveFormat
{
public override string Tag { get { return "ARC/DAF"; } }
public override string Description { get { return "Cadath resource archive"; } }
public override uint Signature { get { return 0x1A464144; } } // 'DAF'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (4);
if (!IsSaneCount (count))
return null;
uint index_offset = 8;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
uint offset = file.View.ReadUInt32 (index_offset);
uint size = file.View.ReadUInt32 (index_offset+4);
var name = file.View.ReadString (index_offset+8, 0x18);
var entry = FormatCatalog.Instance.Create<Entry> (name);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
entry.Offset = offset;
entry.Size = size;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 0x20;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
if (!entry.Name.EndsWith (".snr", System.StringComparison.InvariantCultureIgnoreCase)
|| !arc.File.View.AsciiEqual (entry.Offset, "SNR\x1A"))
return base.OpenEntry (arc, entry);
try
{
var data = arc.File.View.ReadBytes (entry.Offset+12, entry.Size-12);
DecryptSnr (data);
CgfDecoder.Decrypt (data, data.Length);
// uint checksum = LittleEndian.ToUInt32 (data, 0);
// uint crc = Crc32Normal.Compute (data, 4, data.Length-4);
var input = new MemoryStream (data, 4, data.Length-4);
return new ZLibStream (input, CompressionMode.Decompress);
}
catch
{
return base.OpenEntry (arc, entry);
}
}
void DecryptSnr (byte[] data)
{
byte key = 0x84;
for (int i = 0; i < data.Length; ++i)
{
data[i] -= key;
for (int count = ((i & 0xF) + 2) / 3; count > 0; --count)
{
key += 0x99;
}
}
}
}
}