GARbro-mirror/ArcFormats/DaiSystem/ArcPAC.cs

205 lines
8.1 KiB
C#

//! \file ArcPAC.cs
//! \date 2018 Jan 11
//! \brief DAI system 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.Diagnostics;
using System.IO;
using System.Linq;
using GameRes.Utility;
namespace GameRes.Formats.DaiSystem
{
[Export(typeof(ArchiveFormat))]
public class PacOpener : ArchiveFormat
{
public override string Tag { get { return "PAC/DAI"; } }
public override string Description { get { return "DAI system resource archive"; } }
public override uint Signature { get { return 0x5F494144; } } // 'DAI_SYSTEM_01000'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (4, "SYSTEM_01000"))
return null;
int count = Binary.BigEndian (file.View.ReadUInt16 (0x10));
if (!IsSaneCount (count))
return null;
uint index_size = Binary.BigEndian (file.View.ReadUInt32 (0x12));
var index = file.View.ReadBytes (0x16, index_size);
for (int i = 0; i < index.Length; ++i)
index[i] -= (byte)(i + 0x28);
int index_offset = 0;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
int name_end = Array.IndexOf<byte> (index, (byte)',', index_offset);
if (-1 == name_end)
return null;
var name = Encodings.cp932.GetString (index, index_offset, name_end - index_offset);
index_offset = name_end + 1;
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = BigEndian.ToUInt32 (index, index_offset);
index_offset += 5;
dir.Add (entry);
}
for (int i = 1; i < dir.Count; ++i)
{
var entry = dir[i-1];
entry.Size = (uint)(dir[i].Offset - entry.Offset);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
}
dir[dir.Count-1].Size = (uint)(file.MaxOffset - dir[dir.Count-1].Offset);
DetectFileTypes (file, dir);
return new ArcFile (file, this, dir);
}
void DetectFileTypes (ArcView file, List<Entry> dir)
{
foreach (var entry in dir.Where (e => string.IsNullOrEmpty (e.Type)))
{
uint signature = file.View.ReadUInt32 (entry.Offset);
if (0x05304148 == signature)
{
entry.Type = "image";
continue;
}
else if (0x304148 == (signature & 0xFFFFFF))
{
uint encryption = file.View.ReadUInt32 (entry.Offset+8);
long offset = entry.Offset + 0x10 + (signature >> 24);
if (0 != encryption)
{
if (4 == encryption)
{
uint bits = Binary.BigEndian (file.View.ReadUInt32 (offset + 8));
if (bits > entry.Size)
continue;
if (file.View.AsciiEqual (offset+12+bits, "BM"))
{
entry.ChangeType (ImageFormat.Bmp);
}
else if (file.View.AsciiEqual (entry.Offset+entry.Size-0x12, "TRUEVISION"))
{
entry.ChangeType (ImageFormat.Tga);
}
}
continue;
}
signature = file.View.ReadUInt32 (offset);
}
entry.ChangeType (AutoEntry.DetectFileType (signature));
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
if (!arc.File.View.AsciiEqual (entry.Offset, "HA0"))
return base.OpenEntry (arc, entry);
byte header_length = arc.File.View.ReadByte (entry.Offset+3);
uint ha0_header_length = 0x10u + header_length;
if (ha0_header_length >= entry.Size)
return base.OpenEntry (arc, entry);
uint unpacked_size = Binary.BigEndian (arc.File.View.ReadUInt32 (entry.Offset+4));
uint pattern = arc.File.View.ReadUInt32 (entry.Offset+8);
var header = arc.File.View.ReadBytes (entry.Offset+0x10, header_length);
var input = arc.File.View.ReadBytes (entry.Offset + ha0_header_length, entry.Size - ha0_header_length);
while (pattern != 0)
{
uint code = pattern >> 24;
switch (code)
{
case 0: break;
case 2: input = Decrypt2 (input); break;
case 3: input = Decrypt3 (input); break;
case 4: input = Unpack4 (input); break;
default:
Trace.WriteLine (string.Format ("Unknown encryption method ({0})", code), "[DAI_SYSTEM]");
return base.OpenEntry (arc, entry);
}
pattern <<= 8;
}
return new BinMemoryStream (input, entry.Name);
}
byte[] Decrypt2 (byte[] input)
{
var output = new byte[input.Length];
int src = 0;
for (int i = 0; i < 3; ++i)
{
for (int dst = i; dst < output.Length; dst += 3)
output[dst] = input[src++];
}
return output;
}
byte[] Decrypt3 (byte[] input)
{
for (int i = 1; i < input.Length; ++i)
{
input[i] += input[i-1];
}
return input;
}
byte[] Unpack4 (byte[] input)
{
int unpacked_size = BigEndian.ToInt32 (input, 0);
var output = new byte[unpacked_size];
int ctl_bits = BigEndian.ToInt32 (input, 4);
int ctl_bytes = BigEndian.ToInt32 (input, 8);
int ctl = 12;
int src = 12 + ctl_bytes;
int dst = 0;
int bits = 2;
while (dst < output.Length)
{
bits >>= 1;
if (1 == bits)
{
bits = input[ctl++] | 0x100;
}
if (0 == (bits & 1))
{
output[dst++] = input[src++];
}
else
{
int offset = input[src++];
int count = input[src++];
Binary.CopyOverlapped (output, dst-offset, dst, count);
dst += count;
}
}
return output;
}
}
}