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//! \file ArcARCG.cs
//! \date Wed Feb 01 06:41:10 2017
//! \brief Archive format by Tanaka Tatsuhiro.
//
// 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;
using System.Linq;
using System.Runtime.InteropServices;
using GameRes.Cryptography;
using GameRes.Utility;
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namespace GameRes.Formats.Will
{
[Export(typeof(ArchiveFormat))]
public class ArcGOpener : ArchiveFormat
{
public override string Tag { get { return "ARCG"; } }
public override string Description { get { return "Tanaka Tatsuhiro's engine resource archive"; } }
public override uint Signature { get { return 0x47435241; } } // 'ARCG'
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
public ArcGOpener ()
{
Extensions = new string[] { "arc", "bmx", "scb", "vpk" };
}
public override ArcFile TryOpen (ArcView file)
{
if (0x10000 != file.View.ReadUInt32 (4))
return null;
int index_offset = file.View.ReadInt32 (8);
int index_size = file.View.ReadInt32 (0xC);
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int dir_count = file.View.ReadUInt16 (0x10);
int count = file.View.ReadInt32 (0x12);
int base_offset = index_offset;
byte[] index = null;
if (0 == index_offset)
{
if (VFS.IsVirtual || !file.Name.HasExtension ("bmx"))
return null;
var bmi_name = Path.ChangeExtension (file.Name, "bmi");
index = ReadIndex (bmi_name);
if (null == index || !index.AsciiEqual ("ARCG") || index.ToUInt32 (4) != 0x10000)
return null;
index_offset = index.ToInt32 (8);
index_size = index.ToInt32 (0xC);
dir_count = index.ToUInt16 (0x10);
count = index.ToInt32 (0x12);
base_offset = 0;
}
else
{
if (index_offset >= file.MaxOffset)
return null;
index = file.View.ReadBytes (index_offset, (uint)index_size);
}
if (!IsSaneCount (count) || index_size > index.Length)
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return null;
int index_pos = index_offset - base_offset;
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var dir = new List<Entry> (count);
for (int j = 0; j < dir_count; ++j)
{
int name_length = index[index_pos];
var dir_name = Binary.GetCString (index, index_pos+1, name_length-1);
index_pos += name_length;
int dir_offset = index.ToInt32 (index_pos) - base_offset;
int file_count = index.ToInt32 (index_pos+4);
if (dir_offset < 0 || dir_offset >= index.Length || file_count < 0 || file_count > count)
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return null;
index_pos += 8;
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for (int i = 0; i < file_count; ++i)
{
name_length = index[dir_offset];
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if (0 == name_length)
return null;
var file_name = Binary.GetCString (index, dir_offset+1, name_length-1);
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file_name = file_name.Replace ('?', '');
dir_offset += name_length;
file_name = Path.Combine (dir_name, file_name);
var entry = FormatCatalog.Instance.Create<Entry> (file_name);
entry.Offset = index.ToUInt32 (dir_offset);
entry.Size = index.ToUInt32 (dir_offset+4);
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if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir_offset += 8;
dir.Add (entry);
}
}
foreach (var entry in dir.Where (e => string.IsNullOrEmpty (e.Type)))
{
uint signature = file.View.ReadUInt32 (entry.Offset);
IResource res;
if ((signature & 0xFFFF) == 0x4342) // 'BC'
res = BcFormat.Value;
else
res = AutoEntry.DetectFileType (signature);
if (res != null)
entry.Type = res.Type;
}
return new ArcFile (file, this, dir);
}
byte[] ReadIndex (string bmi_name)
{
var index = File.ReadAllBytes (bmi_name);
uint signature = index.ToUInt32 (0);
string passkey;
if (!KnownKeys.TryGetValue (signature, out passkey))
{
var root = Path.GetPathRoot (bmi_name);
if (string.IsNullOrEmpty (root))
return null;
uint serial;
if (!GetVolumeInformation (root, IntPtr.Zero, 0, out serial,
IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, 0))
return null;
passkey = string.Format ("{0:x4}{1}", serial, (int)serial);
}
uint seed = GetSeedFromString (passkey);
var twister = new MersenneTwister (seed);
unsafe
{
fixed (byte* idx8 = index)
{
uint* dst = (uint*)idx8;
for (int n = index.Length / 4; n > 0; --n)
{
*dst++ ^= twister.Rand();
}
}
}
return index;
}
uint GetSeedFromString (string passphrase)
{
if (string.IsNullOrEmpty (passphrase))
return 0;
var buf = Encodings.cp932.GetBytes (passphrase);
int seed = (sbyte)buf[0];
for (int i = 1; i < buf.Length; ++i)
seed *= (sbyte)buf[i];
return (uint)seed;
}
[DllImport("Kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
public extern static bool GetVolumeInformation(
string rootPathName, IntPtr volumeNameBuffer, int volumeNameSize,
out uint volumeSerialNumber, IntPtr maximumComponentLength, IntPtr fileSystemFlags,
IntPtr fileSystemNameBuffer, int nFileSystemNameSize);
BmiScheme KnownSchemes = new BmiScheme();
public override ResourceScheme Scheme
{
get { return KnownSchemes; }
set { KnownSchemes = (BmiScheme)value; }
}
internal IDictionary<uint, string> KnownKeys {
get { return KnownSchemes.KnownKeys ?? new Dictionary<uint, string>(); }
}
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internal static Lazy<ImageFormat> BcFormat = new Lazy<ImageFormat> (() => ImageFormat.FindByTag ("BC"));
}
[Serializable]
public class BmiScheme : ResourceScheme
{
public IDictionary<uint, string> KnownKeys;
}
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}