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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
*
* todo: qtv --rsyncable
// gzip.net version allows all options for all commands.
USE_GZIP(NEWTOY(gzip, "cdfk123456789[-123456789]", TOYFLAG_USR|TOYFLAG_BIN))
USE_GUNZIP(NEWTOY(gunzip, "cdfk123456789[-123456789]", TOYFLAG_USR|TOYFLAG_BIN))
USE_ZCAT(NEWTOY(zcat, "cdfk123456789[-123456789]", TOYFLAG_USR|TOYFLAG_BIN))
config GZIP
bool "gzip"
default y
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
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
help
usage: zcat [FILE...]
Decompress files to stdout. Like `gzip -dc`.
-f Force: allow read from tty
*/
#define FORCE_FLAGS
#define FOR_gzip
#include "toys.h"
GLOBALS(
int level;
)
// Use assembly optimized zlib code?
#if CFG_TOYBOX_LIBZ
#include <zlib.h>
// Read fron in_fd, write to out_fd, decompress if dd else compress
static int do_deflate(int in_fd, int out_fd, int dd, int level)
{
int len, err = 0;
char *b = "r";
gzFile gz;
if (!dd) {
sprintf(b = toybuf, "w%d", level);
if (out_fd == 1) out_fd = xdup(out_fd);
}
if (!(gz = gzdopen(dd ? in_fd : out_fd, b))) perror_exit("gzdopen");
if (dd) {
while ((len = gzread(gz, toybuf, sizeof(toybuf))) > 0)
if (len != writeall(out_fd, toybuf, len)) break;
} else {
while ((len = read(in_fd, toybuf, sizeof(toybuf))) > 0)
if (len != gzwrite(gz, toybuf, len)) break;
}
err = !!len;
if (len>0 || err == Z_ERRNO) perror_msg(dd ? "write" : "read");
if (len<0)
error_msg("%s%s: %s", "gz", dd ? "read" : "write", gzerror(gz, &len));
if (gzclose(gz) != Z_OK) perror_msg("gzclose"), err++;
return err;
}
// Use toybox's builtin lib/deflate.c
#else
// Read from in_fd, write to out_fd, decompress if dd else compress
static int do_deflate(int in_fd, int out_fd, int dd, int level)
{
int x;
if (dd) WOULD_EXIT(x, gunzip_fd(in_fd, out_fd));
else WOULD_EXIT(x, gzip_fd(in_fd, out_fd));
return x;
}
#endif
static void do_gzip(int in_fd, char *arg)
{
struct stat sb;
int len, out_fd = 0;
char *out_name = 0;
// Are we writing to stdout?
if (!in_fd || (toys.optflags&FLAG_c)) out_fd = 1;
if (isatty(in_fd)) {
if (!(toys.optflags&FLAG_f))
return error_msg("%s:need -f to read TTY"+3*!!in_fd, arg);
else out_fd = 1;
}
// Are we reading file.gz to write to file?
if (!out_fd) {
if (fstat(in_fd, &sb)) return perror_msg("%s", arg);
if (!(toys.optflags&FLAG_d)) out_name = xmprintf("%s%s", arg, ".gz");
else {
// "gunzip x.gz" will decompress "x.gz" to "x".
if ((len = strlen(arg))<4 || strcmp(arg+len-3, ".gz"))
return error_msg("no .gz: %s", arg);
out_name = xstrdup(arg);
out_name[len-3] = 0;
}
out_fd = xcreate(out_name,
O_CREAT|O_WRONLY|WARN_ONLY|(O_EXCL*!(toys.optflags&FLAG_f)), sb.st_mode);
if (out_fd == -1) return;
}
if (do_deflate(in_fd, out_fd, toys.optflags&FLAG_d, TT.level) && out_name)
arg = out_name;
if (out_fd != 1) close(out_fd);
if (out_name) {
struct timespec times[] = { sb.st_atim, sb.st_mtim };
if (utimensat(AT_FDCWD, out_name, times, 0)) perror_exit("utimensat");
if (!(toys.optflags&FLAG_k)) if (unlink(arg)) perror_msg("unlink %s", arg);
free(out_name);
}
}
void gzip_main(void)
{
// This depends on 1-9 being at the end of the option list
for (TT.level = 0; TT.level<9; TT.level++)
if ((toys.optflags>>TT.level)&1) break;
if (!(TT.level = 9-TT.level)) TT.level = 6;
loopfiles(toys.optargs, do_gzip);
}
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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