Libzypp/Refactoring/Implementation/Compress

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Handling compressed metadata

• No problem for the parser.

• We should add support for compressed download to the Fetcher (and below). I.e. queue request for (packages.gz or packages).

• Desirable to add the checksum of the compressed file to the content file. Otherwise we had to uncompress to check the SHA1/MD5 sum.

• Desirable to add the size of the uncompressed file to the matdata (content/repomd). This could enable the parser to report proper progress if parsing compressed files. You don't know the size of the uncompessed data in advance.