gzFile
return gzclose((gzFile) cookie);
gzFile gz = gzopen(fname, mode);
extern gzFile EXPORT gzopen OF((const char *path, const char *mode));
extern gzFile EXPORT gzdopen OF((int fd, const char *mode));
extern int EXPORT gzread OF((gzFile file, voidp buf, unsigned len));
extern int EXPORT gzwrite OF((gzFile file, const voidp buf, unsigned len));
extern int EXPORT gzflush OF((gzFile file, int flush));
extern int EXPORT gzclose OF((gzFile file));
extern const char * EXPORT gzerror OF((gzFile file, int *errnum));