public FITSHeader(string fileName)
{
FileStream fs = new FileStream(fileName, FileMode.Open);
ArrayList headerlines = new ArrayList();
bool ext = false;
FITSFILEOPS.SCANPRIMARYUNIT(fs, false, ref headerlines, ref ext);
fs.Close();
HEADERKEYS = new JPFITS.FITSHeaderKey[headerlines.Count];
for (int i = 0; i < HEADERKEYS.Length; i++)
{
HEADERKEYS[i] = new FITSHeaderKey((string)headerlines[i]);
}
}
public static string[] GETALLEXTENSIONNAMES(string FileName, string extension_type)
{
FileStream fs = new FileStream(FileName, FileMode.Open);
ArrayList header_return = null;
bool hasext = false;
if (!FITSFILEOPS.SCANPRIMARYUNIT(fs, true, ref header_return, ref hasext) || !hasext)
{
fs.Close();
if (!hasext)
{
throw new Exception("File '" + FileName + "' indicates no extensions present.");
}
else
{
throw new Exception("File '" + FileName + "' not formatted as FITS file.");
}
}
byte[] charheaderblock = new byte[2880];
int naxis = 0, naxis1 = 0, naxis2 = 0, bitpix = 0;
long pcount = -1;
bool endheader = false, extensiontypefound = false, endfile = false, extnamekeyexists = false;
string strheaderline;
ArrayList namelist = new ArrayList();
string extname = "";
if (fs.Position >= fs.Length)
{
endfile = true;
}
while (!endfile)
{
//reset
extname = "";
endheader = false;
extnamekeyexists = false;
extensiontypefound = false;
naxis = 0;
naxis1 = 0;
naxis2 = 0;
pcount = -1;
bitpix = 0;
while (!endheader)
{
fs.Read(charheaderblock, 0, 2880);
for (int i = 0; i < 36; i++)
{
strheaderline = System.Text.Encoding.ASCII.GetString(charheaderblock, i * 80, 80);
if (!extensiontypefound)
{
if (strheaderline.Substring(0, 8) == "XTENSION")
{
int f = strheaderline.IndexOf("'");
int l = strheaderline.LastIndexOf("'");
if (strheaderline.Substring(f + 1, l - f - 1).Trim() == extension_type)
{
extensiontypefound = true;
}
continue;
}
}
if (!extnamekeyexists)
{
if (strheaderline.Substring(0, 8) == "EXTNAME ")
{
extnamekeyexists = true;
int f = strheaderline.IndexOf("'");
int l = strheaderline.LastIndexOf("'");
extname = strheaderline.Substring(f + 1, l - f - 1).Trim();
continue;
}
}
if (naxis == 0)
{
if (strheaderline.Substring(0, 8).Trim().Equals("NAXIS"))
{
naxis = Convert.ToInt32(strheaderline.Substring(10, 20));
continue;
}
}
if (naxis1 == 0)
{
if (strheaderline.Substring(0, 8).Trim().Equals("NAXIS1"))
{
naxis1 = Convert.ToInt32(strheaderline.Substring(10, 20));
continue;
}
}
if (naxis2 == 0)
{
if (strheaderline.Substring(0, 8).Trim().Equals("NAXIS2"))
{
naxis2 = Convert.ToInt32(strheaderline.Substring(10, 20));
continue;
}
}
if (bitpix == 0)
{
if (strheaderline.Substring(0, 8).Trim().Equals("BITPIX"))
{
bitpix = Convert.ToInt32(strheaderline.Substring(10, 20));
continue;
}
}
if (pcount == -1)
{
if (strheaderline.Substring(0, 8).Trim().Equals("PCOUNT"))
{
pcount = Convert.ToInt64(strheaderline.Substring(10, 20));
continue;
}
}
if (strheaderline.Substring(0, 8) == "END ") //check if we're at the end of the header keys
{
if (extensiontypefound)
{
namelist.Add(extname);
}
endheader = true;
break;
}
}
}
long TableBytes = (long)(naxis1) * (long)(naxis2) * (long)(Math.Abs(bitpix)) / 8;
fs.Seek((long)(Math.Ceiling((double)(TableBytes + pcount) / 2880) * 2880), SeekOrigin.Current);
if (fs.Position >= fs.Length)
{
endfile = true;
}
}
fs.Close();
string[] list = new string[namelist.Count];
for (int i = 0; i < namelist.Count; i++)
{
list[i] = (string)namelist[i];
}
return(list);
}
