1 /* $NetBSD: zopen.c,v 1.4 2017/01/10 04:42:20 kamil Exp $ */
2
3 /*
4 * Public domain stdio wrapper for libz, written by Johan Danielsson.
5 */
6
7 #include <sys/cdefs.h>
8 #ifndef lint
9 __RCSID("$NetBSD: zopen.c,v 1.4 2017/01/10 04:42:20 kamil Exp $");
10 #endif
11
12 #include <stdio.h>
13 #include <zlib.h>
14
15 FILE *zopen(const char *fname, const char *mode);
16
17 /* convert arguments */
18 static int
xgzread(void * cookie,char * data,int size)19 xgzread(void *cookie, char *data, int size)
20 {
21 return gzread(cookie, data, size);
22 }
23
24 static int
xgzwrite(void * cookie,const char * data,int size)25 xgzwrite(void *cookie, const char *data, int size)
26 {
27 return gzwrite(cookie, __UNCONST(data), size);
28 }
29
30 FILE *
zopen(const char * fname,const char * mode)31 zopen(const char *fname, const char *mode)
32 {
33 gzFile gz = gzopen(fname, mode);
34 if(gz == NULL)
35 return NULL;
36
37 if(*mode == 'r')
38 return funopen(gz, xgzread, NULL, NULL, (int (*)(void *))gzclose);
39 else
40 return funopen(gz, NULL, xgzwrite, NULL, (int (*)(void *))gzclose);
41 }
42