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ClickHouse/contrib/libzlib-ng/test/minigzip.c
Alexey Zatelepin 8f74b844fc import zlib-ng sources from 343c4c5491 [#METR-23582]
2017-01-08 21:26:03 +03:00

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/* minigzip.c -- simulate gzip using the zlib compression library
* Copyright (C) 1995-2006, 2010, 2011 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.
*/
/* @(#) $Id$ */
#include "zlib.h"
#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)
#define BUFLEN 16384 /* read buffer size */
#define BUFLENW (BUFLEN * 3) /* write buffer size */
#define MAX_NAME_LEN 1024
#ifndef WITH_GZFILEOP
/* without WITH_GZFILEOP, create simplified gz* functions using deflate and inflate */
#if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE)
# include <unistd.h> /* for unlink() */
#endif
void *myalloc (void *, unsigned, unsigned);
void myfree (void *, void *);
void *myalloc(void *q, unsigned n, unsigned m)
{
(void)q;
return calloc(n, m);
}
void myfree(void *q, void *p)
{
(void)q;
free(p);
}
typedef struct gzFile_s {
FILE *file;
int write;
int err;
const char *msg;
z_stream strm;
unsigned char *buf;
} *gzFile;
gzFile gzopen (const char *, const char *);
gzFile gzdopen (int, const char *);
gzFile gz_open (const char *, int, const char *);
gzFile gzopen(const char *path, const char *mode)
{
return gz_open(path, -1, mode);
}
gzFile gzdopen(int fd, const char *mode)
{
return gz_open(NULL, fd, mode);
}
gzFile gz_open(const char *path, int fd, const char *mode)
{
gzFile gz;
int ret;
int level = Z_DEFAULT_COMPRESSION;
const char *plevel = mode;
gz = malloc(sizeof(struct gzFile_s));
if (gz == NULL)
return NULL;
gz->write = strchr(mode, 'w') != NULL;
gz->strm.zalloc = myalloc;
gz->strm.zfree = myfree;
gz->strm.opaque = Z_NULL;
gz->buf = malloc(gz->write ? BUFLENW : BUFLEN);
if (gz->buf == NULL) {
free(gz);
return NULL;
}
while (*plevel) {
if (*plevel >= '0' && *plevel <= '9') {
level = *plevel - '0';
break;
}
plevel++;
}
if (gz->write)
ret = deflateInit2(&(gz->strm), level, 8, 15 + 16, 8, 0);
else {
gz->strm.next_in = 0;
gz->strm.avail_in = Z_NULL;
ret = inflateInit2(&(gz->strm), 15 + 16);
}
if (ret != Z_OK) {
free(gz);
return NULL;
}
gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") :
fopen(path, gz->write ? "wb" : "rb");
if (gz->file == NULL) {
gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm));
free(gz);
return NULL;
}
gz->err = 0;
gz->msg = "";
return gz;
}
int gzwrite (gzFile, const void *, unsigned);
int gzwrite(gzFile gz, const void *buf, unsigned len)
{
z_stream *strm;
if (gz == NULL || !gz->write)
return 0;
strm = &(gz->strm);
strm->next_in = (void *)buf;
strm->avail_in = len;
do {
strm->next_out = gz->buf;
strm->avail_out = BUFLENW;
(void)deflate(strm, Z_NO_FLUSH);
fwrite(gz->buf, 1, BUFLENW - strm->avail_out, gz->file);
} while (strm->avail_out == 0);
return len;
}
int gzread (gzFile, void *, unsigned);
int gzread(gzFile gz, void *buf, unsigned len)
{
z_stream *strm;
if (gz == NULL || gz->write || gz->err)
return 0;
strm = &(gz->strm);
strm->next_out = buf;
strm->avail_out = len;
do {
if (strm->avail_in == 0)
{
strm->next_in = gz->buf;
strm->avail_in = (uint32_t)fread(gz->buf, 1, BUFLEN, gz->file);
}
if (strm->avail_in > 0)
{
int ret = inflate(strm, Z_NO_FLUSH);
if (ret == Z_DATA_ERROR) {
gz->err = ret;
gz->msg = strm->msg;
return 0;
}
else if (ret == Z_STREAM_END)
inflateReset(strm);
}
else
break;
} while (strm->avail_out);
return len - strm->avail_out;
}
int gzclose (gzFile);
int gzclose(gzFile gz)
{
z_stream *strm;
if (gz == NULL)
return Z_STREAM_ERROR;
strm = &(gz->strm);
if (gz->write) {
strm->next_in = Z_NULL;
strm->avail_in = 0;
do {
strm->next_out = gz->buf;
strm->avail_out = BUFLENW;
(void)deflate(strm, Z_FINISH);
fwrite(gz->buf, 1, BUFLENW - strm->avail_out, gz->file);
} while (strm->avail_out == 0);
deflateEnd(strm);
}
else
inflateEnd(strm);
free(gz->buf);
fclose(gz->file);
free(gz);
return Z_OK;
}
const char *gzerror (gzFile, int *);
const char *gzerror(gzFile gz, int *err)
{
*err = gz->err;
return gz->msg;
}
#endif
char *prog;
void error (const char *msg);
void gz_compress (FILE *in, gzFile out);
#ifdef USE_MMAP
int gz_compress_mmap (FILE *in, gzFile out);
#endif
void gz_uncompress (gzFile in, FILE *out);
void file_compress (char *file, char *mode);
void file_uncompress (char *file);
int main (int argc, char *argv[]);
/* ===========================================================================
* Display error message and exit
*/
void error(const char *msg)
{
fprintf(stderr, "%s: %s\n", prog, msg);
exit(1);
}
/* ===========================================================================
* Compress input to output then close both files.
*/
void gz_compress(FILE *in, gzFile out)
{
char buf[BUFLEN];
int len;
int err;
#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
for (;;) {
len = (int)fread(buf, 1, sizeof(buf), in);
if (ferror(in)) {
perror("fread");
exit(1);
}
if (len == 0) break;
if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err));
}
fclose(in);
if (gzclose(out) != Z_OK) error("failed gzclose");
}
#ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */
/* Try compressing the input file at once using mmap. Return Z_OK if
* if success, Z_ERRNO otherwise.
*/
int gz_compress_mmap(FILE *in, gzFile out)
{
int len;
int err;
int ifd = fileno(in);
caddr_t 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((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);
if (buf == (caddr_t)(-1)) return Z_ERRNO;
/* Compress the whole file at once: */
len = gzwrite(out, (char *)buf, (unsigned)buf_len);
if (len != (int)buf_len) error(gzerror(out, &err));
munmap(buf, buf_len);
fclose(in);
if (gzclose(out) != Z_OK) error("failed gzclose");
return Z_OK;
}
#endif /* USE_MMAP */
/* ===========================================================================
* Uncompress input to output then close both files.
*/
void gz_uncompress(gzFile in, FILE *out)
{
char buf[BUFLENW];
int len;
int err;
for (;;) {
len = gzread(in, buf, sizeof(buf));
if (len < 0) error (gzerror(in, &err));
if (len == 0) break;
if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
error("failed fwrite");
}
}
if (fclose(out)) error("failed fclose");
if (gzclose(in) != Z_OK) error("failed gzclose");
}
/* ===========================================================================
* Compress the given file: create a corresponding .gz file and remove the
* original.
*/
void file_compress(char *file, char *mode)
{
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 = gzopen(outfile, mode);
if (out == NULL) {
fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);
exit(1);
}
gz_compress(in, out);
unlink(file);
}
/* ===========================================================================
* Uncompress the given file and remove the original.
*/
void file_uncompress(char *file)
{
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 = 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);
unlink(infile);
}
/* ===========================================================================
* Usage: minigzip [-c] [-d] [-f] [-h] [-r] [-1 to -9] [files...]
* -c : write to standard output
* -d : decompress
* -f : compress with Z_FILTERED
* -h : compress with Z_HUFFMAN_ONLY
* -r : compress with Z_RLE
* -1 to -9 : compression level
*/
int main(int argc, char *argv[])
{
int copyout = 0;
int uncompr = 0;
gzFile file;
char *bname, outmode[20];
snprintf(outmode, sizeof(outmode), "%s", "wb6 ");
prog = argv[0];
bname = strrchr(argv[0], '/');
if (bname)
bname++;
else
bname = argv[0];
argc--, argv++;
if (!strcmp(bname, "gunzip"))
uncompr = 1;
else if (!strcmp(bname, "zcat"))
copyout = uncompr = 1;
while (argc > 0) {
if (strcmp(*argv, "-c") == 0)
copyout = 1;
else if (strcmp(*argv, "-d") == 0)
uncompr = 1;
else if (strcmp(*argv, "-f") == 0)
outmode[3] = 'f';
else if (strcmp(*argv, "-h") == 0)
outmode[3] = 'h';
else if (strcmp(*argv, "-r") == 0)
outmode[3] = 'R';
else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' &&
(*argv)[2] == 0)
outmode[2] = (*argv)[1];
else
break;
argc--, argv++;
}
if (outmode[3] == ' ')
outmode[3] = 0;
if (argc == 0) {
SET_BINARY_MODE(stdin);
SET_BINARY_MODE(stdout);
if (uncompr) {
file = gzdopen(fileno(stdin), "rb");
if (file == NULL) error("can't gzdopen stdin");
gz_uncompress(file, stdout);
} else {
file = 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 = gzopen(*argv, "rb");
if (file == NULL)
fprintf(stderr, "%s: can't gzopen %s\n", prog, *argv);
else
gz_uncompress(file, stdout);
} else {
file_uncompress(*argv);
}
} else {
if (copyout) {
FILE * in = fopen(*argv, "rb");
if (in == NULL) {
perror(*argv);
} else {
file = gzdopen(fileno(stdout), outmode);
if (file == NULL) error("can't gzdopen stdout");
gz_compress(in, file);
}
} else {
file_compress(*argv, outmode);
}
}
} while (argv++, --argc);
}
return 0;
}
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