GARbro-mirror/ArcFormats/StudioEgo/ArcPAK0.cs

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//! \file ArcPAK0.cs
//! \date Sun Nov 22 10:31:48 2015
//! \brief Studio e.go! resource archives.
//
// 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.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
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using GameRes.Utility;
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namespace GameRes.Formats.Ego
{
internal struct DirEntry
{
public string Name;
public int Parent;
public int LastIndex;
}
[Export(typeof(ArchiveFormat))]
public class Pak0Opener : ArchiveFormat
{
public override string Tag { get { return "PAK0/EGO"; } }
public override string Description { get { return "Studio e.go! resource archive"; } }
public override uint Signature { get { return 0x304B4150; } } // 'PAK0'
public override bool IsHierarchic { get { return true; } }
public override bool CanCreate { get { return false; } }
public Pak0Opener ()
{
Extensions = new string[] { "dat" };
}
public override ArcFile TryOpen (ArcView file)
{
uint data_offset = file.View.ReadUInt32 (4);
int dir_count = file.View.ReadInt32 (8);
int count = file.View.ReadInt32 (0xC);
if (data_offset <= 0x14 || data_offset >= file.MaxOffset)
return null;
if (!IsSaneCount (dir_count) || !IsSaneCount (count))
return null;
var reader = new Pak0Reader (file, data_offset, dir_count, count);
var dir = reader.ReadIndex();
return null != dir ? new ArcFile (file, this, dir) : null;
}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
{
if (entry.Size <= 0x1C || !arc.File.View.AsciiEqual (entry.Offset, "SCR "))
return base.OpenEntry (arc, entry);
uint version = arc.File.View.ReadUInt32 (entry.Offset+4);
uint method = arc.File.View.ReadUInt32 (entry.Offset+8);
if (0 == version || !(1 == method || 2 == method))
return base.OpenEntry (arc, entry);
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
DecryptScript (method, data);
return new MemoryStream (data);
}
unsafe void DecryptScript (uint method, byte[] script)
{
int length = LittleEndian.ToInt32 (script, 0x10);
if (length < 4 || length > script.Length + 0x14)
return;
uint key = LittleEndian.ToUInt32 (script, 0xC);
fixed (byte* data8 = &script[0x14])
{
uint* data32 = (uint*)data8;
length /= 4;
if (1 == method)
{
for (int i = 0; i < length; ++i)
{
if (0 == (i & 0xFF))
key = 0 == key ? 1u : 0u;
key += 0x7654321;
*data32++ ^= key;
}
}
else if (2 == method)
{
for (int i = 0; i < length; ++i)
{
if (0 == (i & 0xFF))
key = ~key;
key += 0x7654321;
*data32++ ^= key;
}
}
}
}
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}
internal sealed class Pak0Reader
{
ArcView m_file;
uint m_data_offset;
int m_dir_count;
int m_count;
uint m_name_pos;
public Pak0Reader (ArcView file, uint data_offset, int dir_count, int file_count)
{
m_file = file;
m_data_offset = data_offset;
m_dir_count = dir_count;
m_count = file_count;
}
public List<Entry> ReadIndex ()
{
if (m_data_offset > m_file.View.Reserve (0, m_data_offset))
return null;
uint index_offset = 0x10;
m_name_pos = index_offset + (uint)m_dir_count * 8u + (uint)m_count * 0x10u;
var dirs = new DirEntry[m_dir_count];
for (int i = 0; i < m_dir_count; ++i)
{
dirs[i].Parent = m_file.View.ReadInt32 (index_offset);
dirs[i].LastIndex = m_file.View.ReadInt32 (index_offset+4);
if (dirs[i].Parent >= m_dir_count || dirs[i].Parent == i)
return null;
if (-1 != dirs[i].Parent)
dirs[i].Name = ReadNextName();
index_offset += 8;
}
var files = new List<Entry> (m_count);
int current = 0;
for (int i = 0; i < m_dir_count; ++i)
{
string parent_dir = GetPath (dirs, i);
while (current < dirs[i].LastIndex)
{
string name = Path.Combine (parent_dir, ReadNextName());
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = m_file.View.ReadUInt32 (index_offset);
entry.Size = m_file.View.ReadUInt32 (index_offset+4);
files.Add (entry);
index_offset += 0x10;
++current;
}
}
return files;
}
string GetPath (IList<DirEntry> dirs, int dir_index)
{
List<string> path = new List<string> (2);
for (int i = dir_index; dirs[i].Parent != -1; i = dirs[i].Parent)
path.Add (dirs[i].Name);
if (0 == path.Count)
return string.Empty;
path.Reverse();
return Path.Combine (path.ToArray());
}
string ReadNextName ()
{
uint length = m_file.View.ReadByte (m_name_pos++);
var name = m_file.View.ReadString (m_name_pos, length);
m_name_pos += length;
return name;
}
}
}