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(FC01): implemented AGSI archives.

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morkt 2018-03-11 20:59:15 +04:00
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commit a8e7249a10
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ArcFormats/FC01/ArcPAK.cs Normal file
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//! \file ArcPAK.cs
//! \date 2018 Feb 27
//! \brief AGSI 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 System.Security.Cryptography;
using GameRes.Compression;
using GameRes.Cryptography;
using GameRes.Utility;
// Advanced Game Script Interpreter
namespace GameRes.Formats.FC01
{
internal class AgsiEntry : PackedEntry
{
public int Method;
public bool IsEncrypted;
public bool IsSpecial;
}
internal class AgsiArchive : ArcFile
{
public readonly byte[] Key;
public AgsiArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] key)
: base (arc, impl, dir)
{
Key = key;
}
}
[Export(typeof(ArchiveFormat))]
public class PakOpener : ArchiveFormat
{
public override string Tag { get { return "PAK/AGSI"; } }
public override string Description { get { return "AGSI engine resource archive"; } }
public override uint Signature { get { return 0x24A02028; } }
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
static readonly Dictionary<string, byte[]> KnownKeys = new Dictionary<string,byte[]> {
{ "01.pak", new byte[] { 0x4A, 0xC9, 0x75, 0x62, 0x39, 0xC1, 0xBE, 0x54 } },
{ "02.pak", new byte[] { 0xC9, 0x46, 0x32, 0x69, 0x7B, 0xD2, 0x58, 0x54 } },
{ "03.pak", new byte[] { 0x33, 0x34, 0x37, 0x38, 0x73, 0x68, 0x61, 0x6F } }, // "3478shao"
{ "04.pak", new byte[] { 0x73, 0x69, 0x6F, 0x62, 0x6E, 0x72, 0x61, 0x68 } }, // "siobnrah"
{ "05.pak", new byte[] { 0xB5, 0x37, 0x70, 0x38, 0x3D, 0x62, 0x48, 0xD1 } },
{ "06.pak", new byte[] { 0x4F, 0x7D, 0x40, 0x24, 0x57, 0xCD, 0x68, 0x6E } },
};
public override ArcFile TryOpen (ArcView file)
{
var header = file.View.ReadBytes (0, 12);
byte k1 = file.View.ReadByte (file.MaxOffset-9);
byte k2 = file.View.ReadByte (file.MaxOffset-6);
DecryptHeader (header, k1, k2);
if (!header.AsciiEqual ("PACK"))
return null;
int count = header.ToInt32 (4);
int entry_size = header.ToInt32 (8);
if (!IsSaneCount (count) || entry_size <= 0x10)
return null;
int index_size = count * entry_size;
var index = file.View.ReadBytes (12, (uint)index_size);
Decrypt (index, 0, index_size, 7524u);
long data_offset = 12 + index_size;
int index_offset = 0;
int name_length = entry_size - 0x10;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name = Binary.GetCString (index, index_offset+0x10, name_length);
var entry = FormatCatalog.Instance.Create<AgsiEntry> (name);
entry.UnpackedSize = index.ToUInt32 (index_offset);
entry.Size = index.ToUInt32 (index_offset+4);
entry.Method = index.ToInt32 (index_offset+8);
entry.Offset = index.ToUInt32 (index_offset+0xC) + data_offset;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
entry.IsPacked = entry.Method != 0;
entry.IsEncrypted = entry.Method >= 3 && (entry.Method <= 5 || entry.Method == 7);
entry.IsSpecial = name.Equals ("Copyright.Dat", StringComparison.OrdinalIgnoreCase);
dir.Add (entry);
index_offset += entry_size;
}
var arc_name = Path.GetFileName (file.Name).ToLowerInvariant();
byte[] key;
if (!KnownKeys.TryGetValue (arc_name, out key) || key == null)
return new ArcFile (file, this, dir);
return new AgsiArchive (file, this, dir, key);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var aent = entry as AgsiEntry;
if (null == aent || 0 == aent.Method)
return base.OpenEntry (arc, entry);
var aarc = arc as AgsiArchive;
Stream input;
if (aent.IsEncrypted && aarc != null && aarc.Key != null)
{
uint enc_size = entry.Size;
if (enc_size > 1024)
{
enc_size = 1032;
}
using (var des = DES.Create())
{
des.Key = aarc.Key;
des.Mode = CipherMode.ECB;
des.Padding = PaddingMode.Zeros;
using (var enc = arc.File.CreateStream (entry.Offset, enc_size))
using (var dec = new InputCryptoStream (enc, des.CreateDecryptor()))
{
var output = new byte[enc_size];
dec.Read (output, 0, output.Length);
int header_size;
if (!aent.IsSpecial)
header_size = output.ToInt32 (output.Length-4);
else
header_size = (int)aent.UnpackedSize;
if (!aent.IsSpecial && entry.Size > enc_size)
{
var header = new byte[header_size];
Buffer.BlockCopy (output, 0, header, 0, header_size);
input = arc.File.CreateStream (entry.Offset + enc_size, entry.Size - enc_size);
input = new PrefixStream (header, input);
}
else
input = new BinMemoryStream (output, 0, header_size, entry.Name);
}
}
}
else
input = arc.File.CreateStream (entry.Offset, entry.Size);
switch (aent.Method)
{
case 6:
case 7:
input = new LzssStream (input);
break;
}
return input;
}
void DecryptHeader (byte[] header, byte k1, byte k2)
{
int shift = k2 & 7;
if (0 == shift)
shift = 1;
for (int i = 0; i < header.Length; ++i)
{
byte x = Binary.RotByteL (header[i], shift);
header[i] = (byte)(x ^ k1++);
}
}
void Decrypt (byte[] data, int pos, int length, uint seed)
{
var rnd = new MersenneTwister (seed);
for (int i = 0; i < length; ++i)
{
uint key = rnd.Rand();
int shift = (int)key & 7;
if (0 == shift)
shift = 1;
byte x = Binary.RotByteL (data[pos+i], shift);
data[pos+i] = (byte)(key ^ x);
}
}
}
}