stefco/apllib

apllib's Issues

Add support for offset/scaling etc in BINTABLE

Add support for various BINTABLE metadata fields defined in the
FITS specification.

Scaling works like:

physicalvalue=TZEROn+TSCALn×fieldvalue

• TZEROn Add this to the scaled fields.
• TSCALn Multiply scaled fields by this (before adding TZERO).
• TNULLn Value to be interpreted as "missing"
• TDIMn Shape (⍴) of the column
• TDMINn Min physical value
• TDMAXn Max physical value
• TLMINn Min possible physically meaningful value for this field
• TLMAXn Max possible physically meaningful value for this field

Also add HEAP support, which requires interpreting:

• THEAP Separation, in bytes, between the end of the BINTABLE and the
  start of the heap.

Add 32-bit float/complex support to `fitsdr`

• float32
• complex32

Handle domain errors and overflows in reads

This probably requires providing:

• Sensible defaults to overwrite bad values
• A way of, by default, raising the domain error, but trapping and
  proceeding if specified by the user
• Returning a mask over the good/bad values, or a scalar 1 if no bad
  values were encountered

Specific types to be handled:

• Handle infinite float values by rounding them to the largest/smallest
  possible float
• Pass-through 64-bit integers that can't be represented as a 64-bit float
  (i.e. >53 bits) but provide a mask over them