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Add compression detection #255

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Add compression detection #255

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Commits on Aug 12, 2019

  1. xz magic is actually 6 bytes long

    @bmwiedemann
    bmwiedemann committed Aug 12, 2019
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  2. use gzip -n option for compression 

    to omit the timestamp and thus produce reproducible compression output
which has a chance to match the original
    @bmwiedemann
    bmwiedemann committed Aug 12, 2019
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  3. add compression-level detection logic

    @bmwiedemann
    bmwiedemann committed Aug 12, 2019
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  4. detect xz, bz2 and gz compression level 

    this can help to get closer to identical files
after applying deltas
    @bmwiedemann
    bmwiedemann committed Aug 12, 2019
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