busybox/archival/bbunzip.c

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/* vi: set sw=4 ts=4: */
/*
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* Common code for gunzip-like applets
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#include "unarchive.h"
enum {
OPT_STDOUT = 0x1,
OPT_FORCE = 0x2,
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/* gunzip and bunzip2 only: */
OPT_VERBOSE = 0x4,
OPT_DECOMPRESS = 0x8,
OPT_TEST = 0x10,
};
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;
}
int FAST_FUNC bbunpack(char **argv,
char* (*make_new_name)(char *filename),
USE_DESKTOP(long long) int (*unpacker)(void)
)
{
struct stat stat_buf;
USE_DESKTOP(long long) int status;
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char *filename, *new_name;
smallint exitcode = 0;
do {
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/* NB: new_name is *maybe* malloc'ed! */
new_name = NULL;
filename = *argv; /* can be NULL - 'streaming' bunzip2 */
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if (filename && LONE_DASH(filename))
filename = NULL;
/* Open src */
if (filename) {
if (stat(filename, &stat_buf) != 0) {
bb_simple_perror_msg(filename);
err:
exitcode = 1;
goto free_name;
}
if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 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))
goto err;
filename = NULL;
}
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/* Open dst if we are going to unpack to file */
if (filename) {
new_name = make_new_name(filename);
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);
}
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/* 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;
}
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/* Check that the input is sane */
if (isatty(STDIN_FILENO) && (option_mask32 & OPT_FORCE) == 0) {
bb_error_msg_and_die("compressed data not read from terminal, "
"use -f to force it");
}
status = unpacker();
if (status < 0)
exitcode = 1;
if (filename) {
char *del = new_name;
if (status >= 0) {
/* TODO: restore user/group/times here? */
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/* Delete _compressed_ file */
del = filename;
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/* restore extension (unless tgz -> tar case) */
if (new_name == filename)
filename[strlen(filename)] = '.';
}
xunlink(del);
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#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
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free_name:
if (new_name != filename)
free(new_name);
}
} while (*argv && *++argv);
return exitcode;
}
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#if ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNCOMPRESS
static
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char* make_new_name_generic(char *filename, const char *expected_ext)
{
char *extension = strrchr(filename, '.');
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if (!extension || strcmp(extension + 1, expected_ext) != 0) {
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/* Mimic GNU gunzip - "real" bunzip2 tries to */
/* unpack file anyway, to file.out */
return NULL;
}
*extension = '\0';
return filename;
}
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#endif
/*
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* Modified for busybox by Glenn McGrath
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* Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
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#if ENABLE_BUNZIP2
static
char* make_new_name_bunzip2(char *filename)
{
return make_new_name_generic(filename, "bz2");
}
static
USE_DESKTOP(long long) int unpack_bunzip2(void)
{
return unpack_bz2_stream(STDIN_FILENO, STDOUT_FILENO);
}
int bunzip2_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int bunzip2_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
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getopt32(argv, "cfvdt");
argv += optind;
if (applet_name[2] == 'c')
option_mask32 |= OPT_STDOUT;
return bbunpack(argv, make_new_name_bunzip2, unpack_bunzip2);
}
#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
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* busybox functions by Glenn McGrath
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
* 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.
*/
#if ENABLE_GUNZIP
static
char* make_new_name_gunzip(char *filename)
{
char *extension = strrchr(filename, '.');
if (!extension)
return NULL;
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extension++;
if (strcmp(extension, "tgz" + 1) == 0
#if ENABLE_FEATURE_GUNZIP_UNCOMPRESS
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|| strcmp(extension, "Z") == 0
#endif
) {
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extension[-1] = '\0';
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} else if (strcmp(extension, "tgz") == 0) {
filename = xstrdup(filename);
extension = strrchr(filename, '.');
extension[2] = 'a';
extension[3] = 'r';
} else {
return NULL;
}
return filename;
}
static
USE_DESKTOP(long long) int unpack_gunzip(void)
{
USE_DESKTOP(long long) int status = -1;
/* do the decompression, and cleanup */
if (xread_char(STDIN_FILENO) == 0x1f) {
unsigned char magic2;
magic2 = xread_char(STDIN_FILENO);
if (ENABLE_FEATURE_GUNZIP_UNCOMPRESS && magic2 == 0x9d) {
status = uncompress(STDIN_FILENO, STDOUT_FILENO);
} else if (magic2 == 0x8b) {
status = unpack_gz_stream(STDIN_FILENO, STDOUT_FILENO);
} else {
goto bad_magic;
}
if (status < 0) {
bb_error_msg("error inflating");
}
} else {
bad_magic:
bb_error_msg("invalid magic");
/* status is still == -1 */
}
return status;
}
/*
* 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 ATTRIBUTE_UNUSED, char **argv)
{
getopt32(argv, "cfvdtn");
argv += optind;
/* if called as zcat */
if (applet_name[1] == 'c')
option_mask32 |= OPT_STDOUT;
return bbunpack(argv, make_new_name_gunzip, unpack_gunzip);
}
#endif
/*
* Small lzma deflate implementation.
* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
*
* Based on bunzip.c from busybox
*
* Licensed under GPL v2, see file LICENSE in this tarball for details.
*/
#if ENABLE_UNLZMA
static
char* make_new_name_unlzma(char *filename)
{
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return make_new_name_generic(filename, "lzma");
}
static
USE_DESKTOP(long long) int unpack_unlzma(void)
{
return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
}
int unlzma_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int unlzma_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
getopt32(argv, "cf");
argv += optind;
/* lzmacat? */
if (applet_name[4] == 'c')
option_mask32 |= OPT_STDOUT;
return bbunpack(argv, make_new_name_unlzma, unpack_unlzma);
}
#endif
/*
* Uncompress applet for busybox (c) 2002 Glenn McGrath
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#if ENABLE_UNCOMPRESS
static
char* make_new_name_uncompress(char *filename)
{
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return make_new_name_generic(filename, "Z");
}
static
USE_DESKTOP(long long) int unpack_uncompress(void)
{
USE_DESKTOP(long long) int status = -1;
if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) {
bb_error_msg("invalid magic");
} else {
status = uncompress(STDIN_FILENO, STDOUT_FILENO);
}
return status;
}
int uncompress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int uncompress_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
getopt32(argv, "cf");
argv += optind;
return bbunpack(argv, make_new_name_uncompress, unpack_uncompress);
}
#endif