public override ImageMetaData ReadMetaData(IBinaryStream file)
{
using (var lzs = new LzssStream(file.AsStream, LzssMode.Decompress, true))
{
if (lzs.ReadByte() != 'B' || lzs.ReadByte() != 'M')
{
return(null);
}
var bmp = new byte[0x26];
if (0x24 != lzs.Read(bmp, 2, 0x24))
{
return(null);
}
int file_size = LittleEndian.ToInt32(bmp, 2);
int width = LittleEndian.ToInt32(bmp, 0x12);
int height = LittleEndian.ToInt32(bmp, 0x16);
int bpp = LittleEndian.ToInt16(bmp, 0x1C);
int image_size = LittleEndian.ToInt32(bmp, 0x22);
if (0 == image_size)
{
image_size = width * height * (bpp / 8);
}
return(new GrMetaData
{
Width = (uint)width,
Height = (uint)height,
BPP = bpp,
UnpackedSize = 24 == bpp ? file_size : (image_size + 0x36),
});
}
}