Commits on Mar 30, 2023

1. Add a support for decompressing Zstandard-compressed YAML files …

   Magic numbers and file name extension of Zstandard archives are taken
   from RFC 8878. File extensions were consuleted with crearerepo_c
   <rpm-software-management/createrepo_c#345>.
   Decompression is implemented with rpmio, which added the support in
   rpm-4.14.0. Zstandard support in rpmio is checked at run-time.
   
   NOTE: Only standardized "zst" file name extension is suppored.
   I believe that createrepo_c won't implement nonstandard "zstd"
   extension
   <rpm-software-management/createrepo_c#345>.
   
   NOTE: Version bumped to 2.15 because this adds a new feature and
   enhances API.
   
   TODO: Check interoperability with crearerepo_c when it receives the
   support.
   
   TODO: Deprecate MODULEMD_COMPRESSION_TYPE_SENTINEL and remove it on
   next ABI break. This end of enum prevents from adding new enum values
   in natural order. E.g. if an application uses
   MODULEMD_COMPRESSION_TYPE_SENTINEL for whatever reason, inserting
   a value before it would change MODULEMD_COMPRESSION_TYPE_SENTINEL
   value which is an ABI break. Funilly that value is not used anywhere
   in libmodulemd code. Only in tests to iterate over the enum.
   
   fedora-modularity#606

   

   ppisar committed Mar 30, 2023
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