//byte[] colorData;
//WriteableBitmap writeableBitmap;
public PpmFileInfo(PpmFileType type, Size size, ushort maximumColorVal, string data, int dataReadIndexEnd, string filename)
{
FileType = type;
Size = size;
MaximumColorValue = maximumColorVal;
this.data = data;
this.dataReadIndexEnd = dataReadIndexEnd;
this.filename = filename;
//writeableBitmap = new WriteableBitmap(Size.Width, Size.Height, 96, 96, PixelFormats.Bgra32, null);
//var rect = new System.Windows.Int32Rect(0, 0, Size.Width, Size.Height);
//var stride = (rect.Width * writeableBitmap.Format.BitsPerPixel + 7) / 8;
//var bufferSize = rect.Height* stride;
//colorData = new byte[bufferSize];
//Random r = new Random();
//r.NextBytes(colorData);
//writeableBitmap.WritePixels(rect, colorData, stride, 0);
}
public static PpmFileInfo ReadFileInfo(string filename)
{
int currentStep = 1;
Size size = new Size(-1, -1);
ushort maximumColorValue = 0;
PpmFileType ppmFileType = PpmFileType.Invalid;
char commentStartChar = '#';
bool isComment = false;
string text = System.IO.File.ReadAllText(filename);
char fileType = 'P';
StringBuilder valueAsStringBuilder = new StringBuilder();
for (int i = 0; i < text.Length; i++)
{
if (currentStep == 1)
{
if (isComment)
{
if (text[i] == '\n' /* || text[i] == '\r\n'*/)
{
isComment = false;
}
}
else if (text[i] == commentStartChar)
{
isComment = true;
}
else if (text[i] == fileType)
{
if (i + 1 < text.Length)
{
if (text[i + 1] == '3')
{
ppmFileType = PpmFileType.P3;
currentStep = 2;
i += 2;
}
else if (text[i + 1] == '6')
{
ppmFileType = PpmFileType.P6;
currentStep = 2;
i += 2;
}
}
}
else if (!Char.IsWhiteSpace(text[i]))
{
throw new FileFormatException(
String.Format("Found illegal character!\n Character index: {0}\n Character: {1}", i, text[i]));
}
}
if (currentStep == 2)
{
if (isComment)
{
if (text[i] == '\n' /* || text[i] == '\r\n'*/)
{
isComment = false;
}
}
else if (text[i] == commentStartChar)
{
isComment = true;
}
else if (Char.IsDigit(text[i]))
{
valueAsStringBuilder.Append(text[i]);
}
else if (Char.IsWhiteSpace(text[i]))
{
if (valueAsStringBuilder.ToString() != String.Empty)
{
int val = int.Parse(valueAsStringBuilder.ToString());
if (size.Width == -1)
{
size.Width = val;
valueAsStringBuilder.Clear();
}
else if (size.Height == -1)
{
size.Height = val;
currentStep = 3;
i += 1;
valueAsStringBuilder.Clear();
}
}
}
else
{
throw new FileFormatException(
String.Format("Found illegal character!\n Character index: {0}\n Character: {1}", i, text[i]));
}
}
if (currentStep == 3)
{
if (isComment)
{
if (text[i] == '\n' /* || text[i] == '\r\n'*/)
{
isComment = false;
}
}
else if (text[i] == commentStartChar)
{
isComment = true;
}
else if (Char.IsDigit(text[i]))
{
valueAsStringBuilder.Append(text[i]);
}
else if (Char.IsWhiteSpace(text[i]))
{
if (valueAsStringBuilder.ToString() != String.Empty)
{
ushort val = ushort.Parse(valueAsStringBuilder.ToString());
if (maximumColorValue == 0)
{
maximumColorValue = val;
return(new PpmFileInfo(ppmFileType, size, maximumColorValue, text, i, filename));
}
}
}
else
{
throw new FileFormatException(
String.Format("Found illegal character!\n Character index: {0}\n Character: {1}", i, text[i]));
}
}
}
if (ppmFileType == PpmFileType.Invalid)
{
throw new FileFormatException("Could not find file type info");
}
if (size.Width == -1)
{
throw new FileFormatException("Could not find image width info");
}
if (size.Height == -1)
{
throw new FileFormatException("Could not find image height info");
}
if (maximumColorValue == 0)
{
throw new FileFormatException("Could not find maximum color value info");
}
else
{
throw new FileFormatException("Invalid file format");
}
}
