void ReadBaseImage()
{
try
{
string dir_name = VFS.GetDirectoryName(m_info.FileName);
string base_name = Path.ChangeExtension(m_info.BaseName, "qnt");
base_name = VFS.CombinePath(dir_name, base_name);
using (var base_file = VFS.OpenBinaryStream(base_name))
{
var base_info = Qnt.ReadMetaData(base_file) as QntMetaData;
if (null != base_info && m_info.Width == base_info.Width && m_info.Height == base_info.Height)
{
base_info.FileName = base_name;
var reader = new QntFormat.Reader(base_file.AsStream, base_info);
reader.Unpack();
m_base_bpp = reader.BPP;
m_base = reader.Data;
}
}
}
catch (Exception X)
{
Trace.WriteLine(X.Message, "[DCF]");
}
}
public void Unpack()
{
long next_pos = m_info.DataOffset;
for (;;)
{
m_input.Position = next_pos;
uint id = m_input.ReadUInt32();
next_pos += 8 + m_input.ReadUInt32();
if (0x6C646664 == id) // 'dfdl'
{
int unpacked_size = m_input.ReadInt32();
if (unpacked_size <= 0)
{
continue;
}
m_mask = new byte[unpacked_size];
using (var input = new ZLibStream(m_input.AsStream, CompressionMode.Decompress, true))
input.Read(m_mask, 0, unpacked_size);
}
else if (0x64676364 == id) // 'dcgd'
{
break;
}
}
long qnt_pos = m_input.Position;
if (m_input.ReadUInt32() != Qnt.Signature)
{
throw new InvalidFormatException();
}
using (var reg = new StreamRegion(m_input.AsStream, qnt_pos, true))
using (var qnt = new BinaryStream(reg, m_input.Name))
{
var qnt_info = Qnt.ReadMetaData(qnt) as QntMetaData;
if (null == qnt_info)
{
throw new InvalidFormatException();
}
var overlay = new QntFormat.Reader(reg, qnt_info);
overlay.Unpack();
m_overlay_bpp = overlay.BPP;
if (m_mask != null)
{
ReadBaseImage();
}
if (m_base != null)
{
m_output = ApplyOverlay(overlay.Data);
SetFormat((int)m_info.Width, m_overlay_bpp);
}
else
{
m_output = overlay.Data;
SetFormat((int)qnt_info.Width, m_overlay_bpp);
}
}
}