public override ImageMetaData ReadMetaData(IBinaryStream stream)
{
var header = stream.ReadHeader(0x24);
CrxdMetaData info = null;
if (header.AsciiEqual(0x20, "CRXJ"))
{
stream.Position = 0x28;
uint diff_offset = stream.ReadUInt32();
using (var crx = OpenByOffset(diff_offset))
{
if (null == crx)
{
return(null);
}
info = ReadMetaData(crx) as CrxdMetaData;
if (info != null)
{
info.DiffOffset = diff_offset;
}
}
}
else if (header.AsciiEqual(0x20, "CRXG"))
{
using (var crx_input = new StreamRegion(stream.AsStream, 0x20, true))
using (var crx = new BinaryStream(crx_input, stream.Name))
{
var diff_info = base.ReadMetaData(crx) as CrxMetaData;
if (null == diff_info)
{
return(null);
}
info = new CrxdMetaData
{
Width = diff_info.Width,
Height = diff_info.Height,
OffsetX = diff_info.OffsetX,
OffsetY = diff_info.OffsetY,
BPP = diff_info.BPP,
DiffInfo = diff_info,
DiffOffset = 0,
};
}
}
if (info != null)
{
info.BaseOffset = header.ToUInt32(8);
info.BaseFileName = header.GetCString(0xC, 0x14);
}
return(info);
}
IBinaryStream OpenDiffStream(IBinaryStream diff, CrxdMetaData info)
{
Stream input;
if (0 == info.DiffOffset)
{
input = new StreamRegion(diff.AsStream, 0x20, true);
}
else
{
diff = OpenByOffset(info.DiffOffset);
if (null == diff)
{
throw new FileNotFoundException("Referenced diff image not found");
}
input = new StreamRegion(diff.AsStream, 0x20);
}
return(new BinaryStream(input, diff.Name));
}