Compute the MD5 hash of data zones in a FITS file.
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<dlcompact><dt><b>Parameters:</b></dt><dd>
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<tr><tdvalign="top"></td><tdvalign="top"><em>filename</em> </td><td>Name of the FITS file to examine. </td></tr>
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<dlcompact><dt><b>Returns:</b></dt><dd>1 statically allocated character string, or NULL.</dd></dl>
This function expects the name of a FITS file. It will compute the MD5 hash on all data blocks in the main data section and possibly extensions (including zero-padding blocks if necessary) and return it as a string suitable for inclusion into a FITS keyword.<p>
The returned string is statically allocated inside this function, so do not free it or modify it. This function returns NULL in case of error. </td>