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[fitsbits] Clarification of EXTEND, please
Stephen Walton writes:
Without naming names, I just today hit a conflict between two pieces of software. One created a FITS file with only a single HDU whose header contained the line 'EXTEND = F'. A second piece of software interpreted the presence of the EXTEND keyword in the primary HDU as meaning it should check for extensions, tried to fseek() beyond the end of the primary HDU and data array, and died. Who did what right and wrong in this scenario? I'll send bug reports with the correct answers to the software authors. The second piece did wrong, twice :-) EXTEND indicates only that the file may contain an extension, not that it does, and then only when set to T. It looks like they took two unwarranted shortcuts... |
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