public static Image ReadPnm(Stream inputStream)
{
char ch;
string str;
string magicWord = ((char)inputStream.ReadByte()).ToString() + ((char)inputStream.ReadByte()).ToString();
inputStream.ReadByte();
PnmEncoding pNMEncoding = PnmFactory.GetPNMEncoding(magicWord);
IPnmDataReader iPNMDataReader = PnmFactory.GetIPNMDataReader(inputStream, pNMEncoding);
if (iPNMDataReader == null)
{
throw new Exception("Currently only Binary and ASCII encoding is supported");
}
IPnmReader iPNMReader = PnmFactory.GetIPNMReader(PnmFactory.GetPNMType(magicWord));
if (iPNMReader == null)
{
throw new Exception("Currently only PBM, PGM and PNM Image Types are supported");
}
do
{
str = iPNMDataReader.ReadLine();
if (str.Length == 0)
{
ch = '#';
}
else
{
ch = str.Substring(0, 1).ToCharArray(0, 1)[0];
}
}while (ch == '#');
string[] strArray = str.Split(new char[] { ' ' });
int width = int.Parse(strArray[0]);
int height = int.Parse(strArray[1]);
if (magicWord != "P1")
{
do
{
str = iPNMDataReader.ReadLine();
if (str.Length == 0)
{
ch = '#';
}
else
{
ch = str.Substring(0, 1).ToCharArray(0, 1)[0];
}
}while (ch == '#');
if (int.Parse(str) != 0xff)
{
Console.WriteLine("Warning, max value for pixels in this image is not 255");
}
}
return(iPNMReader.ReadImageData(iPNMDataReader, width, height));
}
public static void WritePnm(Stream fs, Image im, PnmEncoding encoding, PnmType ptype)
{
IPnmDataWriter iPNMDataWriter = PnmFactory.GetIPNMDataWriter(fs, encoding);
if (iPNMDataWriter == null)
{
throw new Exception("Currently only Binary and ASCII encoding is supported");
}
try
{
iPNMDataWriter.WriteLine(PnmFactory.GetMagicWord(ptype, encoding));
iPNMDataWriter.WriteLine(im.Width.ToString() + " " + im.Height.ToString());
if (ptype != PnmType.Pbm)
{
iPNMDataWriter.WriteLine("255");
}
PnmFactory.GetIPNMWriter(ptype).WriteImageData(iPNMDataWriter, im);
}
catch
{
throw;
}
}
