.Dd January 15, 2017 .Dt GZWRITE 3 .Os . .Sh NAME .Nm gzwrite .Nd write to compressed file . .Sh LIBRARY .Lb libz . .Sh SYNOPSIS .In zlib.h .Ft int .Fn gzwrite "gzFile file" "voidpc buf" "unsigned len" . .Sh DESCRIPTION Writes the given number of uncompressed bytes into the compressed file. . .Sh RETURN VALUES .Fn gzwrite returns the number of uncompressed bytes written or 0 in case of error.