internal BinaryTableHdu(HduBase hdu)
: base(hdu)
{
InitializeMembers();
DetectColumns();
}
private HduBase ReadNextHdu(HduBase prototype)
{
HduBase hdu;
if (prototype != null)
{
hdu = prototype;
hdu.Fits = this;
}
else
{
hdu = new HduBase(this);
}
hdu.ReadHeader();
// Dispatch different types of FITS HDUs
if (prototype != null)
{
return hdu;
}
else if (hdu.IsSimple)
{
return new ImageHdu(hdu);
}
else
{
switch (hdu.Extension)
{
case Constants.FitsKeywordBinTable:
return new BinaryTableHdu(hdu);
default:
throw new NotImplementedException();
}
}
}
internal ImageHdu(HduBase hdu)
: base(hdu)
{
InitializeMembers();
}
internal static FitsTableColumn CreateFromHeader(HduBase hdu, int index)
{
Card card;
// Get data type
if (!hdu.Cards.TryGetValue(Constants.FitsKeywordTForm, index, out card))
{
throw new FitsException("Keyword expected but not found:"); // TODO
}
var tform = card.GetString();
var dt = FitsDataType.CreateFromTForm(tform);
// Create column
var column = new FitsTableColumn()
{
ID = index,
};
// Set optional parameters
// --- Column name
if (hdu.Cards.TryGetValue(Constants.FitsKeywordTType, index, out card))
{
column.Name = card.GetString();
}
// Unit
if (hdu.Cards.TryGetValue(Constants.FitsKeywordTUnit, index, out card))
{
column.Unit = card.GetString();
}
// Null value equivalent
if (hdu.Cards.TryGetValue(Constants.FitsKeywordTNull, index, out card))
{
column.NullValue = card.GetInt32();
}
// Scale
if (hdu.Cards.TryGetValue(Constants.FitsKeywordTScal, index, out card))
{
column.Scale = card.GetDouble();
}
// Zero offset
if (hdu.Cards.TryGetValue(Constants.FitsKeywordTZero, index, out card))
{
column.Zero = card.GetDouble();
}
// Format
if (hdu.Cards.TryGetValue(Constants.FitsKeywordTDisp, index, out card))
{
column.Format = card.GetString();
}
return column;
}
internal HduBase(HduBase old)
{
CopyMembers(old);
}
private void CopyMembers(HduBase old)
{
this.file = old.file;
this.headerRead = old.headerRead;
this.headerPosition = old.headerPosition;
this.dataPosition = old.dataPosition;
this.cards = new CardCollection(old.cards);
//this.columns =
this.strideBuffer = null;
this.totalStrides = 0;
this.strideCounter = 0;
}
