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+.Dd January 15, 2017
+.Dt GZSETPARAMS 3
+.Os
+.
+.Sh NAME
+.Nm gzsetparams
+.Nd set compression level and strategy
+.
+.Sh LIBRARY
+.Lb libz
+.
+.Sh SYNOPSIS
+.In zlib.h
+.Ft int
+.Fn gzsetparams "gzFile file" "int level" "int strategy"
+.
+.Sh DESCRIPTION
+Dynamically update the compression level or strategy.
+See the description of
+.Xr deflateInit2 3
+for the meaning
+of these parameters.
+Previously provided data is flushed
+before the parameter change.
+.
+.Sh RETURN VALUES
+.Fn gzsetparams
+returns
+.Dv Z_OK
+if success,
+.Dv Z_STREAM_ERROR
+if the file was not opened for writing,
+.Dv Z_ERRNO
+if there is an error writing the flushed data,
+or
+.Dv Z_MEM_ERROR
+if there is a memory allocation error.
+.
+.Sh SEE ALSO
+.Xr deflateInit2 3 ,
+.Xr gzopen 3
+.
+.Sh HISTORY
+This manual page was converted from
+.In zlib.h
+to mdoc format by
+.An C. McEnroe Aq Mt june@causal.agency .
+.
+.Sh AUTHORS
+.An Jean-loup Gailly Aq Mt jloup@gzip.org
+.An Mark Adler Aq Mt madler@alumni.caltech.edu