Server-side (de)compressor filters
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Key: CORE-6431
URL: http://tracker.firebirdsql.org/browse/CORE-6431
Project: Firebird Core
Issue Type: New Feature
Reporter: Basil A. Sidorov
Add ability automatic (de)compressor filter for backup (gbak) and dump
(nbackup) on engine level via firebird.conf settings.
Motivation - universal (de)compression for services "by suffix".
New directives in firebird.conf:
FilterCompressor: type - string, value - suffix and compressor command line
(.zst,"zstd -1q" and so on). Multiple directives allowed. Default value - None
(no filter).
FilterDecompressor: type - sting, value - suffix and decompressor command line
(.zst,"zstd -qd" and soon). Mulitple directives allowed. Default value - None
(no filter).
Compressor filters not used for special name stdout and apply only for file
with "known" suffix.
If input stream (from stdin or from file) not accepted "by suffix" (filter
command return non-zero error code) and not accepted "without filter", engine
may try all known decompressors (in some order).
If filter applied, engine must add message about filter into log.
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