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/* gzip.c - gzip/gunzip/zcat
*
* Copyright 2017 The Android Open Source Project
*
* GZIP RFC: http://www.ietf.org/rfc/rfc1952.txt
// Existing implementations allow all options for all commands.
USE_GZIP(NEWTOY(gzip, "cdfk123456789", TOYFLAG_USR|TOYFLAG_BIN))
USE_GUNZIP(NEWTOY(gunzip, "cdfk123456789", TOYFLAG_USR|TOYFLAG_BIN))
USE_ZCAT(NEWTOY(zcat, "cdfk123456789", TOYFLAG_USR|TOYFLAG_BIN))
config GZIP
bool "gzip"
default y
depends on TOYBOX_LIBZ
help
usage: gzip [-19cdfk] [FILE...]
Compress files. With no files, compresses stdin to stdout.
On success, the input files are removed and replaced by new
files with the .gz suffix.
-c Output to stdout
-d Decompress (act as gunzip)
-f Force: allow overwrite of output file
-k Keep input files (default is to remove)
-# Compression level 1-9 (1:fastest, 6:default, 9:best)
config GUNZIP
bool "gunzip"
default y
depends on TOYBOX_LIBZ
help
usage: gunzip [-cfk] [FILE...]
Decompress files. With no files, decompresses stdin to stdout.
On success, the input files are removed and replaced by new
files without the .gz suffix.
-c Output to stdout (act as zcat)
-f Force: allow read from tty
-k Keep input files (default is to remove)
config ZCAT
bool "zcat"
default y
depends on TOYBOX_LIBZ
help
usage: zcat [FILE...]
Decompress files to stdout. Like `gzip -dc`.
-c Output to stdout (default)
-f Force: allow read from tty
*/
#include <zlib.h>
#define FORCE_FLAGS
#define FOR_gzip
#include "toys.h"
GLOBALS(
int level;
)
static void fix_time(const char *path, struct stat *sb)
{
struct timespec times[] = { sb->st_atim, sb->st_mtim };
if (utimensat(AT_FDCWD, path, times, 0)) perror_exit("utimensat");
}
static void gzerror_exit(gzFile f, char *what)
{
int err;
const char *msg = gzerror(f, &err);
((err == Z_ERRNO) ? perror_exit : error_exit)("%s: %s", what, msg);
}
static void do_gunzip(int in_fd, char *arg)
{
struct stat sb;
int len, both_files;
char *in_name, *out_name;
gzFile in;
FILE *out;
// "gunzip x.gz" will decompress "x.gz" to "x".
len = strlen(arg);
if (len > 3 && !strcmp(arg+len-3, ".gz")) {
in_name = strdup(arg);
out_name = strdup(arg);
out_name[len-3] = '\0';
} else if (!strcmp(arg, "-")) {
// "-" means stdin; assume output to stdout.
// TODO: require -f to read compressed data from tty?
in_name = strdup("-");
out_name = strdup("-");
} else error_exit("unknown suffix: %s", arg);
if (toys.optflags&FLAG_c) {
free(out_name);
out_name = strdup("-");
}
both_files = strcmp(in_name, "-") && strcmp(out_name, "-");
if (both_files) xstat(in_name, &sb);
in = gzdopen(in_fd, "r");
if (in == NULL) perror_exit("gzdopen");
if (!strcmp(out_name, "-")) out = stdout;
else {
int out_fd = xcreate(out_name,
O_CREAT|O_WRONLY|((toys.optflags&FLAG_f)?0:O_EXCL),
both_files?sb.st_mode:0666);
out = xfdopen(out_fd, "w");
}
while ((len = gzread(in, toybuf, sizeof(toybuf))) > 0) {
if (fwrite(toybuf, 1, len, out) != (size_t) len) perror_exit("writing");
}
if (len < 0) gzerror_exit(in, "gzread");
if (out != stdout && fclose(out)) perror_exit("writing");
if (gzclose(in) != Z_OK) error_exit("gzclose");
if (both_files) fix_time(out_name, &sb);
if (!(toys.optflags&(FLAG_c|FLAG_k))) unlink(in_name);
free(in_name);
free(out_name);
}
static void do_gzip(int in_fd, char *in_name)
{
size_t len;
char *out_name;
FILE *in = xfdopen(in_fd, "r");
gzFile out;
struct stat sb;
int both_files, out_fd;
out_name = (toys.optflags&FLAG_c) ? strdup("-") : xmprintf("%s.gz", in_name);
both_files = strcmp(in_name, "-") && strcmp(out_name, "-");
if (both_files) xstat(in_name, &sb);
if (!strcmp(out_name, "-")) out_fd = dup(1);
else {
out_fd = open(out_name, O_CREAT|O_WRONLY|((toys.optflags&FLAG_f)?0:O_EXCL),
both_files?sb.st_mode:0);
}
if (out_fd == -1) perror_exit("open %s", out_name);
snprintf(toybuf, sizeof(toybuf), "w%d", TT.level);
out = gzdopen(out_fd, toybuf);
if (out == NULL) perror_exit("gzdopen %s", out_name);
while ((len = fread(toybuf, 1, sizeof(toybuf), in)) > 0) {
if (gzwrite(out, toybuf, len) != (int) len) gzerror_exit(out, "gzwrite");
}
if (ferror(in)) perror_exit("fread");
if (fclose(in)) perror_exit("fclose");
if (gzclose(out) != Z_OK) error_exit("gzclose");
if (both_files) fix_time(out_name, &sb);
if (!(toys.optflags&(FLAG_c|FLAG_k))) unlink(in_name);
free(out_name);
}
static void do_gz(int fd, char *name)
{
if (toys.optflags&FLAG_d) do_gunzip(fd, name);
else do_gzip(fd, name);
}
void gzip_main(void)
{
int i = (toys.optflags&0x1ff);
for (TT.level = (i == 0) ? 6 : 10; i; i >>= 1) --TT.level;
// With no arguments, go from stdin to stdout.
if (!*toys.optargs) toys.optflags |= FLAG_c;
loopfiles(toys.optargs, do_gz);
}
void gunzip_main(void)
{
toys.optflags |= FLAG_d;
gzip_main();
}
void zcat_main(void)
{
toys.optflags |= (FLAG_c|FLAG_d);
gzip_main();
}
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