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/*
* This simple library intends to make it transparent to read gzipped and/or
* standard files. This is simple enough to fit modutils' needs, but may be
* easily adapted to anyone's needs. It's completely free, do what you want
* with it . - Willy Tarreau <willy@meta-x.org> - 2000/05/05 -
*/
#ifdef CONFIG_USE_ZLIB
#include <stdio.h>
#include <zlib.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
/* redefinition of gz_stream which isn't exported by zlib */
typedef struct gz_stream {
z_stream stream;
int z_err; /* error code for last stream operation */
int z_eof; /* set if end of input file */
FILE *file; /* .gz file */
Byte *inbuf; /* input buffer */
Byte *outbuf; /* output buffer */
uLong crc; /* crc32 of uncompressed data */
char *msg; /* error message */
char *path; /* path name for debugging only */
int transparent; /* 1 if input file is not a .gz file */
char mode; /* 'w' or 'r' */
long startpos; /* start of compressed data in file (header skipped) */
} gz_stream;
/* maximum number of simultaneous open files, also greater file descriptor number */
#define MAXFD 64
/* this static list is assumed to be filled with NULLs at runtime */
static gzFile gzf_fds[MAXFD];
/* returns the filedesc of the opened file. */
int gzf_open(const char *name, int mode) {
int fd;
gzFile g;
if ((g=gzopen(name, "rb")) != NULL) {
fd=fileno(((gz_stream*)g)->file);
gzf_fds[fd]=g;
}
else if ((fd=open(name, mode)) != -1) {
gzf_fds[fd]=NULL; /* NULL means not GZ mode */
}
return fd;
}
off_t gzf_lseek(int fd, off_t offset, int whence) {
if (fd<0 || fd>=MAXFD || gzf_fds[fd]==NULL)
return lseek(fd, offset, whence);
else
return gzseek(gzf_fds[fd], offset, whence);
}
int gzf_read(int fd, void *buf, size_t count) {
if (fd<0 || fd>=MAXFD || gzf_fds[fd]==NULL)
return read(fd, buf, count);
else
return gzread(gzf_fds[fd], buf, count);
}
void gzf_close(int fd) {
if (fd<0 || fd>=MAXFD || gzf_fds[fd]==NULL)
close(fd);
else
gzclose(gzf_fds[fd]);
}
#endif
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