2016-04-25 21:00:28 +04:00

108 lines
4.8 KiB
C#

//! \file ArcAFA.cs
//! \date Mon Apr 25 18:18:57 2016
//! \brief AliceSoft System 4 engine resource archive.
//
// Copyright (C) 2016 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;
using GameRes.Compression;
namespace GameRes.Formats.AliceSoft
{
[Export(typeof(ArchiveFormat))]
public class AfaOpener : ArchiveFormat
{
public override string Tag { get { return "AFA"; } }
public override string Description { get { return "AliceSoft System 4 resource archive"; } }
public override uint Signature { get { return 0x48414641; } } // 'AFAH'
public override bool IsHierarchic { get { return true; } }
public override bool CanCreate { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (8, "AlicArch"))
return null;
if (!file.View.AsciiEqual (0x1C, "INFO"))
return null;
long base_offset = file.View.ReadUInt32 (0x18);
uint packed_size = file.View.ReadUInt32 (0x20);
int unpacked_size = file.View.ReadInt32 (0x24);
int count = file.View.ReadInt32 (0x28);
if (!IsSaneCount (count))
return null;
var dir = new List<Entry> (count);
var name_buf = new byte[0x40];
using (var input = file.CreateStream (0x2C, packed_size))
using (var zstream = new ZLibStream (input, CompressionMode.Decompress))
using (var index = new BinaryReader (zstream))
{
for (int i = 0; i < count; ++i)
{
int name_length = index.ReadInt32();
int index_step = index.ReadInt32();
if (name_length <= 0 || name_length > index_step || index_step > unpacked_size)
return null;
if (index_step > name_buf.Length)
name_buf = new byte[index_step];
if (index_step != index.Read (name_buf, 0, index_step))
return null;
var name = Encodings.cp932.GetString (name_buf, 0, name_length);
var entry = FormatCatalog.Instance.Create<Entry> (name);
index.ReadInt32();
index.ReadInt32();
index.ReadInt32();
entry.Offset = index.ReadUInt32() + base_offset;
entry.Size = index.ReadUInt32();
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
}
return new ArcFile (file, this, dir);
}
}
static readonly byte[] AffKey = {
0xC8, 0xBB, 0x8F, 0xB7, 0xED, 0x43, 0x99, 0x4A,
0xA2, 0x7E, 0x5B, 0xB0, 0x68, 0x18, 0xF8, 0x88
};
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
if (entry.Size <= 0x10 || !arc.File.View.AsciiEqual (entry.Offset, "AFF\0"))
return base.OpenEntry (arc, entry);
uint data_size = entry.Size - 0x10u;
uint encrypted_length = Math.Min (0x40u, data_size);
var prefix = arc.File.View.ReadBytes (entry.Offset+0x10, encrypted_length);
for (int i = 0; i < prefix.Length; ++i)
prefix[i] ^= AffKey[i & 0xF];
if (data_size <= 0x40)
return new MemoryStream (prefix);
var rest = arc.File.CreateStream (entry.Offset+0x10+encrypted_length, data_size-encrypted_length);
return new PrefixStream (prefix, rest);
}
}
}