GARbro-mirror/ArcFormats/elf/ArcAi5Win.cs

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//! \file ArcAi5Win.cs
//! \date Mon Jun 29 04:41:29 2015
//! \brief Ai5Win 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;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using GameRes.Utility;
namespace GameRes.Formats.Elf
{
public class ArcIndexScheme
{
public int NameLength;
public byte NameKey;
public uint SizeKey;
public uint OffsetKey;
}
[Export(typeof(ArchiveFormat))]
public class ArcOpener : ArchiveFormat
{
public override string Tag { get { return "ARC/AI5WIN"; } }
public override string Description { get { return "AI5WIN engine resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanCreate { get { return false; } }
public static readonly Dictionary<string, ArcIndexScheme> KnownSchemes = new Dictionary<string, ArcIndexScheme> {
{ "Jokei Kazoku ~Inbou~", new ArcIndexScheme
{ NameLength = 0x1E, NameKey = 0x73, SizeKey = 0xAF5789BC, OffsetKey = 0x59FACB45 } },
};
public ArcOpener ()
{
Extensions = new string[] { "arc" };
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (0);
if (count <= 0 || count > 0xfffff)
return null;
long index_offset = 4;
var scheme = KnownSchemes.First().Value;
uint index_size = (uint)(count * (scheme.NameLength + 8));
if (index_size > file.View.Reserve (index_offset, index_size))
return null;
var name_buf = new byte[scheme.NameLength];
var dir = new List<Entry>();
for (int i = 0; i < count; ++i)
{
file.View.Read (index_offset, name_buf, 0, (uint)scheme.NameLength);
for (int n = 0; n < name_buf.Length; ++n)
{
name_buf[n] ^= scheme.NameKey;
if (0 == name_buf[n])
break;
}
string name = Binary.GetCString (name_buf, 0, name_buf.Length);
if (0 == name.Length)
return null;
index_offset += scheme.NameLength;
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Size = file.View.ReadUInt32 (index_offset) ^ scheme.SizeKey;
entry.Offset = file.View.ReadUInt32 (index_offset+4) ^ scheme.OffsetKey;
if (entry.Offset < index_size+4 || !entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 8;
}
return new ArcFile (file, this, dir);
}
/*
internal class IndexReader
{
ArcView m_file;
int m_count;
byte[] m_first = new byte[0x108];
public const int MinNameLength = 0x10;
public const int MaxNameLength = 0x100;
public IndexReader (ArcView file)
{
m_file = file;
m_count = m_file.View.ReadInt32 (0);
m_file.View.Read (4, m_first, 0, m_first.Length);
}
ArcIndexScheme m_scheme = new ArcIndexScheme();
public ArcIndexScheme Parse ()
{
if (m_count <= 0 || m_count > 0xfffff)
return null;
uint supposed_first_offset = (uint)(m_count * (name_length + 8));
uint first_size = LittleEndian.ToUInt32 (first_entry, name_length);
uint first_offset = LittleEndian.ToUInt32 (first_entry, name_length+4);
uint supposed_offset_key = first_offset ^ supposed_first_offset;
int last_index_offset = 4 + (m_count - 1) * (name_length + 8);
uint last_size = m_file.View.ReadUInt32 (last_index_offset + name_length);
uint last_offset = m_file.View.ReadUInt32 (last_index_offset + name_length + 4);
last_offset ^= supposed_offset_key;
}
bool ParseFirstEntry (int name_length)
{
int index_offset = 4;
}
public byte NameKey { get; private set; }
int GuessNameLength (int initial)
{
int name_pos = initial;
byte sym;
do
{
do
{
sym = first_entry[name_pos++];
}
while (name_pos < MaxNameLength && sym != first_entry[name_pos]);
if (MaxNameLength == name_pos)
return 0;
while (name_pos < MaxNameLength && sym == first_entry[name_pos])
{
++name_pos;
}
if (MaxNameLength == name_pos && sym == first_entry[name_pos] && sym == first_entry[name_pos+1])
return 0;
}
while (name_pos < MinNameLength || 0 != (name_pos & 1));
NameKey = sym;
return name_pos;
}
}
*/
}
}