1 /*
2 * Public domain stdio wrapper for libz, written by Johan Danielsson.
3 */
4
5 #include <sys/cdefs.h>
6 __FBSDID("$FreeBSD$");
7
8 #include <stdio.h>
9 #include <zlib.h>
10
11 FILE *zopen(const char *fname, const char *mode);
12
13 /* convert arguments */
14 static int
xgzread(void * cookie,char * data,int size)15 xgzread(void *cookie, char *data, int size)
16 {
17 return gzread(cookie, data, size);
18 }
19
20 static int
xgzwrite(void * cookie,const char * data,int size)21 xgzwrite(void *cookie, const char *data, int size)
22 {
23 return gzwrite(cookie, (void*)data, size);
24 }
25
26 static int
xgzclose(void * cookie)27 xgzclose(void *cookie)
28 {
29 return gzclose(cookie);
30 }
31
32 static fpos_t
xgzseek(void * cookie,fpos_t offset,int whence)33 xgzseek(void *cookie, fpos_t offset, int whence)
34 {
35 return gzseek(cookie, (z_off_t)offset, whence);
36 }
37
38 FILE *
zopen(const char * fname,const char * mode)39 zopen(const char *fname, const char *mode)
40 {
41 gzFile gz = gzopen(fname, mode);
42 if(gz == NULL)
43 return NULL;
44
45 if(*mode == 'r')
46 return (funopen(gz, xgzread, NULL, xgzseek, xgzclose));
47 else
48 return (funopen(gz, NULL, xgzwrite, xgzseek, xgzclose));
49 }
50