Commits on Jan 15, 2024

1. ctypes: support adding custom tags with variable length …

   In libtiff, custom tags with variable length (eg, a binary blob) are indicated with
   the special constants TIFF_VARIABLE (-1) or TIFF_VARIABLE2 (-3). In such
   case, when reading a field the length is passed as first argument, and
   the data as a pointer as second argument.
   
   So far, some standard tags with such format were supported, but not
   custom tags.
   => Add support for such tags.
   
   Also fix the names of the attribute created automatically, which got
   broken in the switch from Python 2 to 3.
   What should have been named, for instance, TIFFTAG_CUSTOM, was named
   like TIFFTAG_b'CUSTOM', quotes included!
   
   Also fix the test cases, which were not working, mostly related to
   reading/writing tags.

   

   pieleric committed Jan 15, 2024
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