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//! \file ArcLEAF.cs
//! \date 2018 Nov 06
//! \brief Leaf resource archive.
//
// Copyright (C) 2018 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.Formats.Strings;
using GameRes.Utility;
namespace GameRes.Formats.Leaf
{
internal class LeafArchive : ArcFile
{
public readonly byte[] Key;
public LeafArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] key)
: base (arc, impl, dir)
{
Key = key;
}
}
[Serializable]
public class LeafPackScheme : ResourceScheme
{
public IDictionary<string, byte[]> KnownSchemes;
}
[Export(typeof(ArchiveFormat))]
public class LeafPackOpener : ArchiveFormat
{
public override string Tag { get { return "PAK/LEAF"; } }
public override string Description { get { return "Leaf resource archive"; } }
public override uint Signature { get { return 0x4641454C; } } // 'LEAFPACK'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
LeafPackOpener ()
{
ContainedFormats = new[] { "LFG", "P16", "DAT/GENERIC" };
}
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (4, "PACK"))
return null;
int count = file.View.ReadInt16 (8);
if (!IsSaneCount (count))
return null;
uint index_size = (uint)count * 0x18;
if (index_size >= file.MaxOffset)
return null;
var key = QueryKey (file.Name);
if (null == key)
return null;
var index = file.View.ReadBytes (file.MaxOffset - index_size, index_size);
DecryptData (index, key);
int index_pos = 0;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name = Binary.GetCString (index, index_pos, 8).TrimEnd();
var ext = Binary.GetCString (index, index_pos+8, 3).TrimEnd();
if (!string.IsNullOrWhiteSpace (ext))
name = Path.ChangeExtension (name, ext);
var entry = Create<Entry> (name);
entry.Offset = index.ToUInt32 (index_pos+0xC);
entry.Size = index.ToUInt32 (index_pos+0x10);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_pos += 0x18;
}
return new LeafArchive (file, this, dir, key);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var larc = (LeafArchive)arc;
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
DecryptData (data, larc.Key);
return new BinMemoryStream (data, entry.Name);
}
void DecryptData (byte[] data, byte[] key)
{
for (int i = 0; i < data.Length; ++i)
{
data[i] -= key[i % key.Length];
}
}
byte[] QueryKey (string arc_name)
{
var title = FormatCatalog.Instance.LookupGame (arc_name, @"*.exe");
var key = GetTitleKey (title);
if (null == key)
{
var options = Query<LeafOptions> (arcStrings.ArcEncryptedNotice);
key = options.Key;
}
return key;
}
public override ResourceOptions GetDefaultOptions ()
{
return new LeafOptions {
Key = GetTitleKey (Properties.Settings.Default.LEAFTitle),
};
}
public override object GetAccessWidget ()
{
return new GUI.WidgetLEAF (KnownKeys.Keys);
}
byte[] GetTitleKey (string title)
{
byte[] key = null;
if (!string.IsNullOrEmpty (title))
KnownKeys.TryGetValue (title, out key);
return key;
}
public static readonly byte[] DefaultKey = {
0x71, 0x48, 0x6A, 0x55, 0x9F, 0x13, 0x58, 0xF7, 0xD1, 0x7C, 0x3E
};
static LeafPackScheme DefaultScheme = new LeafPackScheme { KnownSchemes = new Dictionary<string, byte[]>() };
public IDictionary<string, byte[]> KnownKeys { get { return DefaultScheme.KnownSchemes; } }
public override ResourceScheme Scheme
{
get { return DefaultScheme; }
set { DefaultScheme = (LeafPackScheme)value; }
}
}
public class LeafOptions : ResourceOptions
{
public byte[] Key;
}
}