GARbro-mirror/ArcFormats/G2/ArcGCEX.cs

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//! \file ArcGCEX.cs
//! \date Tue Aug 18 04:25:02 2015
//! \brief G2 engine resources archive.
//
// 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;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.Diagnostics;
using System.IO;
using GameRes.Utility;
namespace GameRes.Formats.G2
{
[Export(typeof(ArchiveFormat))]
public class PakOpener : ArchiveFormat
{
public override string Tag { get { return "PAK/G2"; } }
public override string Description { get { return "G2 engine resource archive"; } }
public override uint Signature { get { return 0x58454347; } } // 'GCEX'
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
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public PakOpener ()
{
Extensions = new string[] { "pak" };
}
public override ArcFile TryOpen (ArcView file)
{
if (0 != file.View.ReadInt32 (4))
return null;
long index_offset = file.View.ReadInt64 (8);
if (index_offset >= file.MaxOffset)
return null;
if (!file.View.AsciiEqual (index_offset, "GCE3"))
return null;
int count = file.View.ReadInt32 (index_offset+0x18);
if (!IsSaneCount (count))
return null;
bool index_packed = 0x11 == file.View.ReadInt32 (index_offset+4);
uint index_size = file.View.ReadUInt32 (index_offset+8);
byte[] index = null;
if (index_packed)
{
index_size -= 0x28;
int unpacked_size = file.View.ReadInt32 (index_offset+0x20);
using (var input = file.CreateStream (index_offset+0x28, index_size))
using (var reader = new GceReader (input, unpacked_size))
index = reader.Data;
}
else
{
index_size -= 0x20;
index = new byte[index_size];
if (index.Length != file.View.Read (index_offset+0x20, index, 0, index_size))
return null;
}
int current_index = 0;
int current_filename = 0x20*count;
long current_offset = 0x10;
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
int name_length = LittleEndian.ToUInt16 (index, current_filename);
if (current_filename+2+name_length > index.Length)
return null;
uint size = LittleEndian.ToUInt32 (index, current_index+0x18);
if (size != 0)
{
string name = Encodings.cp932.GetString (index, current_filename+2, name_length);
var entry = new PackedEntry
{
Name = name,
Type = FormatCatalog.Instance.GetTypeFromName (name),
Offset = current_offset,
Size = size,
UnpackedSize = LittleEndian.ToUInt32 (index, current_index+0x10),
};
if (!entry.CheckPlacement (file.MaxOffset))
return null;
entry.IsPacked = entry.Size != entry.UnpackedSize;
current_offset += entry.Size;
dir.Add (entry);
}
current_index += 0x20;
current_filename += 2 + name_length;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
if (0 == entry.Size)
return Stream.Null;
var input = arc.File.CreateStream (entry.Offset, entry.Size);
var pentry = entry as PackedEntry;
if (null == pentry || !pentry.IsPacked)
return input;
if (!arc.File.View.AsciiEqual (entry.Offset, "GCE"))
{
Trace.WriteLine ("Packed entry is not GCE", entry.Name);
return input;
}
using (input)
using (var reader = new GceReader (input, (int)pentry.UnpackedSize))
{
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return new BinMemoryStream (reader.Data, entry.Name);
}
}
}
internal class GceReader : IDisposable
{
IBinaryStream m_input;
int m_unpacked_size;
byte[] m_output = null;
int m_dst;
public byte[] Data
{
get
{
if (null == m_output)
{
m_output = new byte[m_unpacked_size];
Unpack();
}
return m_output;
}
}
public GceReader (IBinaryStream input, int unpacked_size)
{
m_input = input;
m_unpacked_size = unpacked_size;
}
private void Unpack ()
{
m_dst = 0;
byte[] id = new byte[4];
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while (4 == m_input.Read (id, 0, 4))
{
int segment_length = m_input.ReadInt32();
if (Binary.AsciiEqual (id, "GCE1"))
{
m_input.ReadInt32();
int data_length = m_input.ReadInt32();
m_input.ReadInt32();
int cmd_len = m_input.ReadInt32();
long cmd_pos = m_input.Position + data_length;
ReadControlStream (cmd_pos, cmd_len);
int next = m_dst + segment_length;
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UnpackGce1Segment (segment_length);
m_dst = next;
m_input.Position = cmd_pos + cmd_len;
}
else if (Binary.AsciiEqual (id, "GCE0"))
{
if (segment_length != m_input.Read (m_output, m_dst, segment_length))
throw new EndOfStreamException();
m_dst += segment_length;
}
else
{
throw new InvalidFormatException ("Unknown compression type in GCE stream");
}
}
}
int[] m_frame = new int[0x10000];
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void UnpackGce1Segment (int segment_length)
{
int frame_pos = 0;
int dst_end = m_dst + segment_length;
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while (m_dst < dst_end)
{
int n = GetLength();
while (n --> 0)
{
m_frame[frame_pos] = m_dst;
byte b = m_input.ReadUInt8();
frame_pos = ((frame_pos << 8) | b) & 0xFFFF;
m_output[m_dst++] = b;
}
if (m_dst >= dst_end)
break;
n = GetLength() + 1;
int src = m_frame[frame_pos];
while (n --> 0)
{
m_frame[frame_pos] = m_dst;
frame_pos = ((frame_pos << 8) | m_output[src]) & 0xFFFF;
m_output[m_dst++] = m_output[src++];
}
}
}
int GetLength ()
{
int v = 0;
if (0 == GetBit())
{
int digits = 0;
while (0 == GetBit())
++digits;
v = 1 << digits;
while (digits --> 0)
v |= GetBit() << digits;
}
return v;
}
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byte[] m_control;
int m_control_pos;
int m_control_len;
int m_bit_pos;
void ReadControlStream (long pos, int length)
{
var data_pos = m_input.Position;
if (null == m_control || m_control.Length < length)
m_control = new byte[length];
m_input.Position = pos;
if (length != m_input.Read (m_control, 0, length))
throw new EndOfStreamException();
m_control_pos = 0;
m_control_len = length;
m_input.Position = data_pos;
m_bit_pos = 8;
}
int GetBit ()
{
if (0 == m_bit_pos--)
{
++m_control_pos;
m_bit_pos = 7;
--m_control_len;
if (0 == m_control_len)
throw new EndOfStreamException();
}
return 1 & (m_control[m_control_pos] >> m_bit_pos);
}
#region IDisposable Members
public void Dispose ()
{
}
#endregion
}
}