1d997b8114
Follow-up for da13d2ca07. Instead of having
separate definitions of the bitmask flags, just define DEFAULT_COMPRESSION_FOO=0|1
directly.
(It *should* be possible to do this more simply, but the problem is that
anything that is used in #if cannot refer to C constants or enums. This is the
simplest I could come up with that preserves the property that we don't use #ifdef.)
The return value from compress_blob() is changed to propagate the error instead
of always returning -EOPNOTSUPP. The callers don't care about the specific error
value. compress_blob_*() are changed to return the compression method on success, so
that compress_blob() can be simplified. compress_stream_*() and compress_stream() are
changed in the same way for consistency, even though the callers do not currently use
this information (outside of tests).
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