public Bitmap DecodeImage(Stream inps)
{
if (inps == null)
{
return(null);
}
// !!!{{ TODO: add the decoding code here
IEntropyCodec c = new DeflateCodec();
c.BinaryStream = inps;
c.Open(false);
uint magic = (uint)c.GetBits(32);
if (magic != MAGIC)
{
return(null);
}
int width, height;
width = (int)c.GetBits(16);
height = (int)c.GetBits(16);
if (width < 1 || height < 1)
{
return(null);
}
Bitmap result = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int gr = c.Get();
if (gr < 0)
{
goto fin;
}
result.SetPixel(x, y, Color.FromArgb(gr, gr, gr));
}
}
fin:
c.Close();
return(result);
// !!!}}
}
public IEntropyCodec DecodeHeader(Stream inps)
{
if (inps == null)
{
return(null);
}
IEntropyCodec c = new DeflateCodec();
c.BinaryStream = inps;
c.Open(false);
// !!!{{ TODO: add the header decoding here
// Check the global header:
uint magic = (uint)c.GetBits(32);
if (magic != MAGIC)
{
return(null);
}
frameWidth = (int)c.GetBits(16);
frameHeight = (int)c.GetBits(16);
if (frameWidth < 1 || frameHeight < 1)
{
return(null);
}
framesPerSecond = (int)c.GetBits(16);
// !!!}}
return(c);
}
