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zlib-ng/test/minigzip.c
Xin LI 41ed14070b Make internal functions static in the test code. 
To avoid warnings when building with -Wmissing-prototypes.

madler/zlib#bd9c329c1055a9265812352655ed2eec93f36e92
2024-02-07 19:15:56 +01:00

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/* minigzip.c -- simulate gzip using the zlib compression library
* Copyright (C) 1995-2006, 2010, 2011, 2016 Jean-loup Gailly
* For conditions of distribution and use, see copyright notice in zlib.h
*/
/*
* minigzip is a minimal implementation of the gzip utility. This is
* only an example of using zlib and isn't meant to replace the
* full-featured gzip. No attempt is made to deal with file systems
* limiting names to 14 or 8+3 characters, etc... Error checking is
* very limited. So use minigzip only for testing; use gzip for the
* real thing.
*/
#include "zbuild.h"
#ifdef ZLIB_COMPAT
# include "zlib.h"
#else
# include "zlib-ng.h"
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef USE_MMAP
# include <sys/types.h>
# include <sys/mman.h>
# include <sys/stat.h>
#endif
#if defined(_WIN32) || defined(__CYGWIN__)
# include <fcntl.h>
# include <io.h>
# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
#else
# define SET_BINARY_MODE(file)
#endif
#if defined(_MSC_VER) && _MSC_VER < 1900
# define snprintf _snprintf
#endif
#if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE)
#ifndef _WIN32 /* unlink already in stdio.h for Win32 */
extern int unlink (const char *);
#endif
#endif
#ifndef GZ_SUFFIX
# define GZ_SUFFIX ".gz"
#endif
#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)
#ifndef BUFLEN
# define BUFLEN 16384 /* read buffer size */
#endif
#define BUFLENW (BUFLEN * 3) /* write buffer size */
#define MAX_NAME_LEN 1024
static char *prog;
/* ===========================================================================
* Display error message and exit
*/
static void error(const char *msg) {
fprintf(stderr, "%s: %s\n", prog, msg);
exit(1);
}
/* ===========================================================================
* Display last error message of gzFile, close it and exit
*/
static void gz_fatal(gzFile file) {
int err;
fprintf(stderr, "%s: %s\n", prog, PREFIX(gzerror)(file, &err));
PREFIX(gzclose)(file);
exit(1);
}
#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */
/* ===========================================================================
* Try compressing the input file at once using mmap. Return Z_OK if
* success, Z_ERRNO otherwise.
*/
static int gz_compress_mmap(FILE *in, gzFile out) {
int len;
int ifd = fileno(in);
char *buf; /* mmap'ed buffer for the entire input file */
off_t buf_len; /* length of the input file */
struct stat sb;
/* Determine the size of the file, needed for mmap: */
if (fstat(ifd, &sb) < 0) return Z_ERRNO;
buf_len = sb.st_size;
if (buf_len <= 0) return Z_ERRNO;
/* Now do the actual mmap: */
buf = mmap((void *)0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);
if (buf == (char *)(-1)) return Z_ERRNO;
/* Compress the whole file at once: */
len = PREFIX(gzwrite)(out, buf, (unsigned)buf_len);
if (len != (int)buf_len) gz_fatal(out);
munmap(buf, buf_len);
fclose(in);
if (PREFIX(gzclose)(out) != Z_OK) error("failed gzclose");
return Z_OK;
}
#endif /* USE_MMAP */
/* ===========================================================================
* Compress input to output then close both files.
*/
static void gz_compress(FILE *in, gzFile out) {
char *buf;
int len;
#ifdef USE_MMAP
/* Try first compressing with mmap. If mmap fails (minigzip used in a
* pipe), use the normal fread loop.
*/
if (gz_compress_mmap(in, out) == Z_OK) return;
#endif
buf = (char *)calloc(BUFLEN, 1);
if (buf == NULL) {
perror("out of memory");
exit(1);
}
for (;;) {
len = (int)fread(buf, 1, BUFLEN, in);
if (ferror(in)) {
free(buf);
perror("fread");
exit(1);
}
if (len == 0) break;
if (PREFIX(gzwrite)(out, buf, (unsigned)len) != len) gz_fatal(out);
}
free(buf);
fclose(in);
if (PREFIX(gzclose)(out) != Z_OK) error("failed gzclose");
}
/* ===========================================================================
* Uncompress input to output then close both files.
*/
static void gz_uncompress(gzFile in, FILE *out) {
char *buf = (char *)malloc(BUFLENW);
int len;
if (buf == NULL) error("out of memory");
for (;;) {
len = PREFIX(gzread)(in, buf, BUFLENW);
if (len < 0) {
free(buf);
gz_fatal(in);
}
if (len == 0) break;
if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
free(buf);
error("failed fwrite");
}
}
free(buf);
if (fclose(out)) error("failed fclose");
if (PREFIX(gzclose)(in) != Z_OK) error("failed gzclose");
}
/* ===========================================================================
* Compress the given file: create a corresponding .gz file and remove the
* original.
*/
static void file_compress(char *file, char *mode, int keep) {
char outfile[MAX_NAME_LEN];
FILE *in;
gzFile out;
if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) {
fprintf(stderr, "%s: filename too long\n", prog);
exit(1);
}
snprintf(outfile, sizeof(outfile), "%s%s", file, GZ_SUFFIX);
in = fopen(file, "rb");
if (in == NULL) {
perror(file);
exit(1);
}
out = PREFIX(gzopen)(outfile, mode);
if (out == NULL) {
fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);
exit(1);
}
gz_compress(in, out);
if (!keep)
unlink(file);
}
/* ===========================================================================
* Uncompress the given file and remove the original.
*/
static void file_uncompress(char *file, int keep) {
char buf[MAX_NAME_LEN];
char *infile, *outfile;
FILE *out;
gzFile in;
size_t len = strlen(file);
if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) {
fprintf(stderr, "%s: filename too long\n", prog);
exit(1);
}
snprintf(buf, sizeof(buf), "%s", file);
if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) {
infile = file;
outfile = buf;
outfile[len-3] = '\0';
} else {
outfile = file;
infile = buf;
snprintf(buf + len, sizeof(buf) - len, "%s", GZ_SUFFIX);
}
in = PREFIX(gzopen)(infile, "rb");
if (in == NULL) {
fprintf(stderr, "%s: can't gzopen %s\n", prog, infile);
exit(1);
}
out = fopen(outfile, "wb");
if (out == NULL) {
perror(file);
exit(1);
}
gz_uncompress(in, out);
if (!keep)
unlink(infile);
}
static void show_help(void) {
printf("Usage: minigzip [-c] [-d] [-k] [-f|-h|-R|-F|-T] [-A] [-0 to -9] [files...]\n\n"
" -c : write to standard output\n"
" -d : decompress\n"
" -k : keep input files\n"
" -f : compress with Z_FILTERED\n"
" -h : compress with Z_HUFFMAN_ONLY\n"
" -R : compress with Z_RLE\n"
" -F : compress with Z_FIXED\n"
" -T : stored raw\n"
" -A : auto detect type\n"
" -0 to -9 : compression level\n\n");
}
int main(int argc, char *argv[]) {
int copyout = 0;
int uncompr = 0;
int keep = 0;
int i = 0;
gzFile file;
char *bname, outmode[20];
char *strategy = "";
char *level = "6";
char *type = "b";
prog = argv[i];
bname = strrchr(argv[i], '/');
if (bname)
bname++;
else
bname = argv[i];
if (!strcmp(bname, "gunzip"))
uncompr = 1;
else if (!strcmp(bname, "zcat"))
copyout = uncompr = 1;
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-c") == 0)
copyout = 1;
else if (strcmp(argv[i], "-d") == 0)
uncompr = 1;
else if (strcmp(argv[i], "-k") == 0)
keep = 1;
else if (strcmp(argv[i], "-A") == 0)
type = "";
else if (argv[i][0] == '-' && (argv[i][1] == 'f' || argv[i][1] == 'h' ||
argv[i][1] == 'R' || argv[i][1] == 'F' || argv[i][1] == 'T') && argv[i][2] == 0)
strategy = argv[i] + 1;
else if (argv[i][0] == '-' && argv[i][1] >= '0' && argv[i][1] <= '9' && argv[i][2] == 0)
level = argv[i] + 1;
else if (strcmp(argv[i], "--help") == 0) {
show_help();
return 0;
} else if (argv[i][0] == '-') {
show_help();
return 64; /* EX_USAGE */
} else {
break;
}
}
snprintf(outmode, sizeof(outmode), "w%s%s%s", type, strategy, level);
if (i == argc) {
SET_BINARY_MODE(stdin);
SET_BINARY_MODE(stdout);
if (uncompr) {
file = PREFIX(gzdopen)(fileno(stdin), "rb");
if (file == NULL) error("can't gzdopen stdin");
gz_uncompress(file, stdout);
} else {
file = PREFIX(gzdopen)(fileno(stdout), outmode);
if (file == NULL) error("can't gzdopen stdout");
gz_compress(stdin, file);
}
} else {
if (copyout) {
SET_BINARY_MODE(stdout);
}
do {
if (uncompr) {
if (copyout) {
file = PREFIX(gzopen)(argv[i], "rb");
if (file == NULL)
fprintf(stderr, "%s: can't gzopen %s\n", prog, argv[i]);
else
gz_uncompress(file, stdout);
} else {
file_uncompress(argv[i], keep);
}
} else {
if (copyout) {
FILE * in = fopen(argv[i], "rb");
if (in == NULL) {
perror(argv[i]);
} else {
file = PREFIX(gzdopen)(fileno(stdout), outmode);
if (file == NULL) error("can't gzdopen stdout");
gz_compress(in, file);
}
} else {
file_compress(argv[i], outmode, keep);
}
}
} while (++i < argc);
}
return 0;
}
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