/* vi: set sw=4 ts=4: */ /* * 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, /* 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 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; char *filename, *new_name; smallint exitcode = 0; 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 (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; } /* 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; } /* 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 (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? */ /* 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); return exitcode; } #if ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNCOMPRESS static char* 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 /* * 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 tarball for details. */ #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, char **argv) { 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 * 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; extension++; if (strcmp(extension, "tgz" + 1) == 0 #if ENABLE_FEATURE_GUNZIP_UNCOMPRESS || strcmp(extension, "Z") == 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 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; } int gunzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int gunzip_main(int argc, char **argv) { getopt32(argv, "cfvdt"); 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) { 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, 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) { 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, char **argv) { getopt32(argv, "cf"); argv += optind; return bbunpack(argv, make_new_name_uncompress, unpack_uncompress); } #endif