hush/archival/bbunzip.c
Mike Frysinger 93b51819cf archival: note implicit dependencies between lzop & bbunzip
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2013-03-03 00:48:53 -05:00

467 lines
13 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Common code for gunzip-like applets
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
#include "bb_archive.h"
/* Note: must be kept in sync with archival/lzop.c */
enum {
OPT_STDOUT = 1 << 0,
OPT_FORCE = 1 << 1,
/* only some decompressors: */
OPT_VERBOSE = 1 << 2,
OPT_QUIET = 1 << 3,
OPT_DECOMPRESS = 1 << 4,
OPT_TEST = 1 << 5,
SEAMLESS_MAGIC = (1 << 31) * SEAMLESS_COMPRESSION,
};
static
int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
{
int fd = open3_or_warn(filename, flags, mode);
if (fd < 0) {
return 1;
}
xmove_fd(fd, to_fd);
return 0;
}
char* FAST_FUNC append_ext(char *filename, const char *expected_ext)
{
return xasprintf("%s.%s", filename, expected_ext);
}
int FAST_FUNC bbunpack(char **argv,
IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_aux_data_t *aux),
char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
const char *expected_ext
)
{
struct stat stat_buf;
IF_DESKTOP(long long) int status = 0;
char *filename, *new_name;
smallint exitcode = 0;
transformer_aux_data_t aux;
do {
/* NB: new_name is *maybe* malloc'ed! */
new_name = NULL;
filename = *argv; /* can be NULL - 'streaming' bunzip2 */
if (filename && LONE_DASH(filename))
filename = NULL;
/* Open src */
if (filename) {
if (!(option_mask32 & SEAMLESS_MAGIC)) {
if (stat(filename, &stat_buf) != 0) {
err_name:
bb_simple_perror_msg(filename);
err:
exitcode = 1;
goto free_name;
}
if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
goto err;
} else {
/* "clever zcat" with FILE */
int fd = open_zipped(filename);
if (fd < 0)
goto err_name;
xmove_fd(fd, STDIN_FILENO);
}
} else
if (option_mask32 & SEAMLESS_MAGIC) {
/* "clever zcat" on stdin */
if (setup_unzip_on_fd(STDIN_FILENO, /*fail_if_not_detected*/ 0))
goto err;
}
/* Special cases: test, stdout */
if (option_mask32 & (OPT_STDOUT|OPT_TEST)) {
if (option_mask32 & OPT_TEST)
if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
xfunc_die();
filename = NULL;
}
/* Open dst if we are going to unpack to file */
if (filename) {
new_name = make_new_name(filename, expected_ext);
if (!new_name) {
bb_error_msg("%s: unknown suffix - ignored", filename);
goto err;
}
/* -f: overwrite existing output files */
if (option_mask32 & OPT_FORCE) {
unlink(new_name);
}
/* O_EXCL: "real" bunzip2 doesn't overwrite files */
/* GNU gunzip does not bail out, but goes to next file */
if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
stat_buf.st_mode))
goto err;
}
/* Check that the input is sane */
if (!(option_mask32 & OPT_FORCE) && isatty(STDIN_FILENO)) {
bb_error_msg_and_die("compressed data not read from terminal, "
"use -f to force it");
}
if (!(option_mask32 & SEAMLESS_MAGIC)) {
init_transformer_aux_data(&aux);
aux.check_signature = 1;
status = unpacker(&aux);
if (status < 0)
exitcode = 1;
} else {
if (bb_copyfd_eof(STDIN_FILENO, STDOUT_FILENO) < 0)
/* Disk full, tty closed, etc. No point in continuing */
xfunc_die();
}
if (!(option_mask32 & OPT_STDOUT))
xclose(STDOUT_FILENO); /* with error check! */
if (filename) {
char *del = new_name;
if (status >= 0) {
/* TODO: restore other things? */
if (aux.mtime != 0) {
struct timeval times[2];
times[1].tv_sec = times[0].tv_sec = aux.mtime;
times[1].tv_usec = times[0].tv_usec = 0;
/* Note: we closed it first.
* On some systems calling utimes
* then closing resets the mtime
* back to current time. */
utimes(new_name, times); /* ignoring errors */
}
/* Delete _compressed_ file */
del = filename;
/* restore extension (unless tgz -> tar case) */
if (new_name == filename)
filename[strlen(filename)] = '.';
}
xunlink(del);
#if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */
/* Extreme bloat for gunzip compat */
if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) {
fprintf(stderr, "%s: %u%% - replaced with %s\n",
filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name);
}
#endif
free_name:
if (new_name != filename)
free(new_name);
}
} while (*argv && *++argv);
if (option_mask32 & OPT_STDOUT)
xclose(STDOUT_FILENO); /* with error check! */
return exitcode;
}
#if ENABLE_UNCOMPRESS || ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNXZ
static
char* FAST_FUNC make_new_name_generic(char *filename, const char *expected_ext)
{
char *extension = strrchr(filename, '.');
if (!extension || strcmp(extension + 1, expected_ext) != 0) {
/* Mimic GNU gunzip - "real" bunzip2 tries to */
/* unpack file anyway, to file.out */
return NULL;
}
*extension = '\0';
return filename;
}
#endif
/*
* Uncompress applet for busybox (c) 2002 Glenn McGrath
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//usage:#define uncompress_trivial_usage
//usage: "[-cf] [FILE]..."
//usage:#define uncompress_full_usage "\n\n"
//usage: "Decompress .Z file[s]\n"
//usage: "\n -c Write to stdout"
//usage: "\n -f Overwrite"
#if ENABLE_UNCOMPRESS
static
IF_DESKTOP(long long) int FAST_FUNC unpack_uncompress(transformer_aux_data_t *aux)
{
return unpack_Z_stream(aux, STDIN_FILENO, STDOUT_FILENO);
}
int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int uncompress_main(int argc UNUSED_PARAM, char **argv)
{
getopt32(argv, "cf");
argv += optind;
return bbunpack(argv, unpack_uncompress, make_new_name_generic, "Z");
}
#endif
/*
* Gzip implementation for busybox
*
* Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
*
* Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
* based on gzip sources
*
* Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
* well as stdin/stdout, and to generally behave itself wrt command line
* handling.
*
* General cleanup to better adhere to the style guide and make use of standard
* busybox functions by Glenn McGrath
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
* gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
* Copyright (C) 1992-1993 Jean-loup Gailly
* The unzip code was written and put in the public domain by Mark Adler.
* Portions of the lzw code are derived from the public domain 'compress'
* written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
* Ken Turkowski, Dave Mack and Peter Jannesen.
*
* See the license_msg below and the file COPYING for the software license.
* See the file algorithm.doc for the compression algorithms and file formats.
*/
//usage:#define gunzip_trivial_usage
//usage: "[-cft] [FILE]..."
//usage:#define gunzip_full_usage "\n\n"
//usage: "Decompress FILEs (or stdin)\n"
//usage: "\n -c Write to stdout"
//usage: "\n -f Force"
//usage: "\n -t Test file integrity"
//usage:
//usage:#define gunzip_example_usage
//usage: "$ ls -la /tmp/BusyBox*\n"
//usage: "-rw-rw-r-- 1 andersen andersen 557009 Apr 11 10:55 /tmp/BusyBox-0.43.tar.gz\n"
//usage: "$ gunzip /tmp/BusyBox-0.43.tar.gz\n"
//usage: "$ ls -la /tmp/BusyBox*\n"
//usage: "-rw-rw-r-- 1 andersen andersen 1761280 Apr 14 17:47 /tmp/BusyBox-0.43.tar\n"
//usage:
//usage:#define zcat_trivial_usage
//usage: "[FILE]..."
//usage:#define zcat_full_usage "\n\n"
//usage: "Decompress to stdout"
#if ENABLE_GUNZIP
static
char* FAST_FUNC make_new_name_gunzip(char *filename, const char *expected_ext UNUSED_PARAM)
{
char *extension = strrchr(filename, '.');
if (!extension)
return NULL;
extension++;
if (strcmp(extension, "tgz" + 1) == 0
#if ENABLE_FEATURE_SEAMLESS_Z
|| (extension[0] == 'Z' && extension[1] == '\0')
#endif
) {
extension[-1] = '\0';
} else if (strcmp(extension, "tgz") == 0) {
filename = xstrdup(filename);
extension = strrchr(filename, '.');
extension[2] = 'a';
extension[3] = 'r';
} else {
return NULL;
}
return filename;
}
static
IF_DESKTOP(long long) int FAST_FUNC unpack_gunzip(transformer_aux_data_t *aux)
{
return unpack_gz_stream(aux, STDIN_FILENO, STDOUT_FILENO);
}
/*
* Linux kernel build uses gzip -d -n. We accept and ignore it.
* Man page says:
* -n --no-name
* gzip: do not save the original file name and time stamp.
* (The original name is always saved if the name had to be truncated.)
* gunzip: do not restore the original file name/time even if present
* (remove only the gzip suffix from the compressed file name).
* This option is the default when decompressing.
* -N --name
* gzip: always save the original file name and time stamp (this is the default)
* gunzip: restore the original file name and time stamp if present.
*/
int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int gunzip_main(int argc UNUSED_PARAM, char **argv)
{
getopt32(argv, "cfvqdtn");
argv += optind;
/* If called as zcat...
* Normally, "zcat" is just "gunzip -c".
* But if seamless magic is enabled, then we are much more clever.
*/
if (applet_name[1] == 'c')
option_mask32 |= OPT_STDOUT | SEAMLESS_MAGIC;
return bbunpack(argv, unpack_gunzip, make_new_name_gunzip, /*unused:*/ NULL);
}
#endif
/*
* Modified for busybox by Glenn McGrath
* Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//usage:#define bunzip2_trivial_usage
//usage: "[-cf] [FILE]..."
//usage:#define bunzip2_full_usage "\n\n"
//usage: "Decompress FILEs (or stdin)\n"
//usage: "\n -c Write to stdout"
//usage: "\n -f Force"
//usage:#define bzcat_trivial_usage
//usage: "[FILE]..."
//usage:#define bzcat_full_usage "\n\n"
//usage: "Decompress to stdout"
//applet:IF_BUNZIP2(APPLET(bunzip2, BB_DIR_USR_BIN, BB_SUID_DROP))
//applet:IF_BUNZIP2(APPLET_ODDNAME(bzcat, bunzip2, BB_DIR_USR_BIN, BB_SUID_DROP, bzcat))
#if ENABLE_BUNZIP2
static
IF_DESKTOP(long long) int FAST_FUNC unpack_bunzip2(transformer_aux_data_t *aux)
{
return unpack_bz2_stream(aux, STDIN_FILENO, STDOUT_FILENO);
}
int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int bunzip2_main(int argc UNUSED_PARAM, char **argv)
{
getopt32(argv, "cfvqdt");
argv += optind;
if (applet_name[2] == 'c') /* bzcat */
option_mask32 |= OPT_STDOUT;
return bbunpack(argv, unpack_bunzip2, make_new_name_generic, "bz2");
}
#endif
/*
* Small lzma deflate implementation.
* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
*
* Based on bunzip.c from busybox
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//usage:#define unlzma_trivial_usage
//usage: "[-cf] [FILE]..."
//usage:#define unlzma_full_usage "\n\n"
//usage: "Decompress FILE (or stdin)\n"
//usage: "\n -c Write to stdout"
//usage: "\n -f Force"
//usage:
//usage:#define lzma_trivial_usage
//usage: "-d [-cf] [FILE]..."
//usage:#define lzma_full_usage "\n\n"
//usage: "Decompress FILE (or stdin)\n"
//usage: "\n -d Decompress"
//usage: "\n -c Write to stdout"
//usage: "\n -f Force"
//usage:
//usage:#define lzcat_trivial_usage
//usage: "[FILE]..."
//usage:#define lzcat_full_usage "\n\n"
//usage: "Decompress to stdout"
//usage:
//usage:#define unxz_trivial_usage
//usage: "[-cf] [FILE]..."
//usage:#define unxz_full_usage "\n\n"
//usage: "Decompress FILE (or stdin)\n"
//usage: "\n -c Write to stdout"
//usage: "\n -f Force"
//usage:
//usage:#define xz_trivial_usage
//usage: "-d [-cf] [FILE]..."
//usage:#define xz_full_usage "\n\n"
//usage: "Decompress FILE (or stdin)\n"
//usage: "\n -d Decompress"
//usage: "\n -c Write to stdout"
//usage: "\n -f Force"
//usage:
//usage:#define xzcat_trivial_usage
//usage: "[FILE]..."
//usage:#define xzcat_full_usage "\n\n"
//usage: "Decompress to stdout"
#if ENABLE_UNLZMA
static
IF_DESKTOP(long long) int FAST_FUNC unpack_unlzma(transformer_aux_data_t *aux)
{
return unpack_lzma_stream(aux, STDIN_FILENO, STDOUT_FILENO);
}
int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int unlzma_main(int argc UNUSED_PARAM, char **argv)
{
IF_LZMA(int opts =) getopt32(argv, "cfvqdt");
# if ENABLE_LZMA
/* lzma without -d or -t? */
if (applet_name[2] == 'm' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
bb_show_usage();
# endif
/* lzcat? */
if (applet_name[2] == 'c')
option_mask32 |= OPT_STDOUT;
argv += optind;
return bbunpack(argv, unpack_unlzma, make_new_name_generic, "lzma");
}
#endif
#if ENABLE_UNXZ
static
IF_DESKTOP(long long) int FAST_FUNC unpack_unxz(transformer_aux_data_t *aux)
{
return unpack_xz_stream(aux, STDIN_FILENO, STDOUT_FILENO);
}
int unxz_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int unxz_main(int argc UNUSED_PARAM, char **argv)
{
IF_XZ(int opts =) getopt32(argv, "cfvqdt");
# if ENABLE_XZ
/* xz without -d or -t? */
if (applet_name[2] == '\0' && !(opts & (OPT_DECOMPRESS|OPT_TEST)))
bb_show_usage();
# endif
/* xzcat? */
if (applet_name[2] == 'c')
option_mask32 |= OPT_STDOUT;
argv += optind;
return bbunpack(argv, unpack_unxz, make_new_name_generic, "xz");
}
#endif