zlib:gzopen/4

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Predicate gzopen/4

gzopen(+File, +Mode, -Stream) is det
gzopen(+File, +Mode, -Stream, +Options) is det: Open a file compatible with the gzip program. Note that if a file is opened in append mode, a second gzip image will be added to the end of the file. The gzip standard defines that a file can hold multiple gzip images and inflating the file results in a concatenated stream of all inflated images.
Options are passed to open/4 and zopen/3. Default format is gzip.