[1765] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Common code for gunzip-like applets
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| 4 | *
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| 5 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 6 | */
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| 7 |
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| 8 | #include "libbb.h"
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| 9 | #include "unarchive.h"
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| 10 |
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| 11 | enum {
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| 12 | OPT_STDOUT = 0x1,
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| 13 | OPT_FORCE = 0x2,
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| 14 | /* gunzip only: */
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| 15 | OPT_VERBOSE = 0x4,
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| 16 | OPT_DECOMPRESS = 0x8,
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| 17 | OPT_TEST = 0x10,
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| 18 | };
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| 19 |
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| 20 | static
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| 21 | int open_to_or_warn(int to_fd, const char *filename, int flags, int mode)
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| 22 | {
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| 23 | int fd = open3_or_warn(filename, flags, mode);
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| 24 | if (fd < 0) {
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| 25 | return 1;
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| 26 | }
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| 27 | xmove_fd(fd, to_fd);
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| 28 | return 0;
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| 29 | }
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| 30 |
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| 31 | int bbunpack(char **argv,
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| 32 | char* (*make_new_name)(char *filename),
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| 33 | USE_DESKTOP(long long) int (*unpacker)(void)
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| 34 | )
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| 35 | {
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| 36 | struct stat stat_buf;
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| 37 | USE_DESKTOP(long long) int status;
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| 38 | char *filename, *new_name;
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| 39 | smallint exitcode = 0;
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| 40 |
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| 41 | do {
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| 42 | /* NB: new_name is *maybe* malloc'ed! */
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| 43 | new_name = NULL;
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| 44 | filename = *argv; /* can be NULL - 'streaming' bunzip2 */
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| 45 |
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| 46 | if (filename && LONE_DASH(filename))
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| 47 | filename = NULL;
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| 48 |
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| 49 | /* Open src */
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| 50 | if (filename) {
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| 51 | if (stat(filename, &stat_buf) != 0) {
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| 52 | bb_perror_msg("%s", filename);
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| 53 | err:
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| 54 | exitcode = 1;
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| 55 | goto free_name;
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| 56 | }
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| 57 | if (open_to_or_warn(STDIN_FILENO, filename, O_RDONLY, 0))
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| 58 | goto err;
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| 59 | }
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| 60 |
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| 61 | /* Special cases: test, stdout */
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| 62 | if (option_mask32 & (OPT_STDOUT|OPT_TEST)) {
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| 63 | if (option_mask32 & OPT_TEST)
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| 64 | if (open_to_or_warn(STDOUT_FILENO, bb_dev_null, O_WRONLY, 0))
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| 65 | goto err;
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| 66 | filename = NULL;
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| 67 | }
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| 68 |
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| 69 | /* Open dst if we are going to unpack to file */
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| 70 | if (filename) {
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| 71 | new_name = make_new_name(filename);
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| 72 | if (!new_name) {
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| 73 | bb_error_msg("%s: unknown suffix - ignored", filename);
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| 74 | goto err;
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| 75 | }
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| 76 | /* O_EXCL: "real" bunzip2 doesn't overwrite files */
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| 77 | /* GNU gunzip goes not bail out, but goes to next file */
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| 78 | if (open_to_or_warn(STDOUT_FILENO, new_name, O_WRONLY | O_CREAT | O_EXCL,
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| 79 | stat_buf.st_mode))
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| 80 | goto err;
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| 81 | }
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| 82 |
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| 83 | /* Check that the input is sane */
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| 84 | if (isatty(STDIN_FILENO) && (option_mask32 & OPT_FORCE) == 0) {
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| 85 | bb_error_msg_and_die("compressed data not read from terminal, "
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| 86 | "use -f to force it");
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| 87 | }
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| 88 |
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| 89 | status = unpacker();
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| 90 | if (status < 0)
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| 91 | exitcode = 1;
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| 92 |
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| 93 | if (filename) {
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| 94 | char *del = new_name;
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| 95 | if (status >= 0) {
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| 96 | /* TODO: restore user/group/times here? */
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| 97 | /* Delete _compressed_ file */
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| 98 | del = filename;
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| 99 | /* restore extension (unless tgz -> tar case) */
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| 100 | if (new_name == filename)
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| 101 | filename[strlen(filename)] = '.';
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| 102 | }
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| 103 | xunlink(del);
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| 104 |
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| 105 | #if 0 /* Currently buggy - wrong name: "a.gz: 261% - replaced with a.gz" */
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| 106 | /* Extreme bloat for gunzip compat */
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| 107 | if (ENABLE_DESKTOP && (option_mask32 & OPT_VERBOSE) && status >= 0) {
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| 108 | fprintf(stderr, "%s: %u%% - replaced with %s\n",
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| 109 | filename, (unsigned)(stat_buf.st_size*100 / (status+1)), new_name);
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| 110 | }
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| 111 | #endif
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| 112 |
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| 113 | free_name:
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| 114 | if (new_name != filename)
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| 115 | free(new_name);
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| 116 | }
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| 117 | } while (*argv && *++argv);
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| 118 |
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| 119 | return exitcode;
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| 120 | }
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| 121 |
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| 122 | #if ENABLE_BUNZIP2 || ENABLE_UNLZMA || ENABLE_UNCOMPRESS
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| 123 |
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| 124 | static
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| 125 | char* make_new_name_generic(char *filename, const char *expected_ext)
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| 126 | {
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| 127 | char *extension = strrchr(filename, '.');
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| 128 | if (!extension || strcmp(extension + 1, expected_ext) != 0) {
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| 129 | /* Mimic GNU gunzip - "real" bunzip2 tries to */
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| 130 | /* unpack file anyway, to file.out */
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| 131 | return NULL;
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| 132 | }
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| 133 | *extension = '\0';
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| 134 | return filename;
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| 135 | }
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| 136 |
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| 137 | #endif
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| 138 |
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| 139 |
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| 140 | /*
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| 141 | * Modified for busybox by Glenn McGrath <bug1@iinet.net.au>
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| 142 | * Added support output to stdout by Thomas Lundquist <thomasez@zelow.no>
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| 143 | *
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| 144 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 145 | */
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| 146 |
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| 147 | #if ENABLE_BUNZIP2
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| 148 |
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| 149 | static
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| 150 | char* make_new_name_bunzip2(char *filename)
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| 151 | {
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| 152 | return make_new_name_generic(filename, "bz2");
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| 153 | }
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| 154 |
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| 155 | static
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| 156 | USE_DESKTOP(long long) int unpack_bunzip2(void)
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| 157 | {
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| 158 | return unpack_bz2_stream(STDIN_FILENO, STDOUT_FILENO);
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| 159 | }
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| 160 |
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| 161 | int bunzip2_main(int argc, char **argv);
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| 162 | int bunzip2_main(int argc, char **argv)
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| 163 | {
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| 164 | getopt32(argv, "cf");
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| 165 | argv += optind;
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| 166 | if (applet_name[2] == 'c')
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| 167 | option_mask32 |= OPT_STDOUT;
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| 168 |
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| 169 | return bbunpack(argv, make_new_name_bunzip2, unpack_bunzip2);
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| 170 | }
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| 171 |
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| 172 | #endif
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| 173 |
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| 174 |
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| 175 | /*
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| 176 | * Gzip implementation for busybox
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| 177 | *
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| 178 | * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
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| 179 | *
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| 180 | * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
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| 181 | * based on gzip sources
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| 182 | *
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| 183 | * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
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| 184 | * well as stdin/stdout, and to generally behave itself wrt command line
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| 185 | * handling.
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| 186 | *
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| 187 | * General cleanup to better adhere to the style guide and make use of standard
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| 188 | * busybox functions by Glenn McGrath <bug1@iinet.net.au>
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| 189 | *
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| 190 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 191 | *
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| 192 | * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
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| 193 | * Copyright (C) 1992-1993 Jean-loup Gailly
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| 194 | * The unzip code was written and put in the public domain by Mark Adler.
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| 195 | * Portions of the lzw code are derived from the public domain 'compress'
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| 196 | * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
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| 197 | * Ken Turkowski, Dave Mack and Peter Jannesen.
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| 198 | *
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| 199 | * See the license_msg below and the file COPYING for the software license.
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| 200 | * See the file algorithm.doc for the compression algorithms and file formats.
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| 201 | */
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| 202 |
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| 203 | #if ENABLE_GUNZIP
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| 204 |
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| 205 | static
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| 206 | char* make_new_name_gunzip(char *filename)
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| 207 | {
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| 208 | char *extension = strrchr(filename, '.');
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| 209 |
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| 210 | if (!extension)
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| 211 | return NULL;
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| 212 |
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| 213 | extension++;
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| 214 | if (strcmp(extension, "tgz" + 1) == 0
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| 215 | #if ENABLE_FEATURE_GUNZIP_UNCOMPRESS
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| 216 | || strcmp(extension, "Z") == 0
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| 217 | #endif
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| 218 | ) {
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| 219 | extension[-1] = '\0';
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| 220 | } else if (strcmp(extension, "tgz") == 0) {
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| 221 | filename = xstrdup(filename);
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| 222 | extension = strrchr(filename, '.');
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| 223 | extension[2] = 'a';
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| 224 | extension[3] = 'r';
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| 225 | } else {
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| 226 | return NULL;
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| 227 | }
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| 228 | return filename;
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| 229 | }
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| 230 |
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| 231 | static
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| 232 | USE_DESKTOP(long long) int unpack_gunzip(void)
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| 233 | {
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| 234 | USE_DESKTOP(long long) int status = -1;
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| 235 |
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| 236 | /* do the decompression, and cleanup */
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| 237 | if (xread_char(STDIN_FILENO) == 0x1f) {
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| 238 | unsigned char magic2;
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| 239 |
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| 240 | magic2 = xread_char(STDIN_FILENO);
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| 241 | if (ENABLE_FEATURE_GUNZIP_UNCOMPRESS && magic2 == 0x9d) {
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| 242 | status = uncompress(STDIN_FILENO, STDOUT_FILENO);
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| 243 | } else if (magic2 == 0x8b) {
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| 244 | check_header_gzip_or_die(STDIN_FILENO);
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| 245 | status = unpack_gz_stream(STDIN_FILENO, STDOUT_FILENO);
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| 246 | } else {
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| 247 | goto bad_magic;
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| 248 | }
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| 249 | if (status < 0) {
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| 250 | bb_error_msg("error inflating");
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| 251 | }
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| 252 | } else {
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| 253 | bad_magic:
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| 254 | bb_error_msg("invalid magic");
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| 255 | /* status is still == -1 */
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| 256 | }
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| 257 | return status;
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| 258 | }
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| 259 |
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| 260 | int gunzip_main(int argc, char **argv);
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| 261 | int gunzip_main(int argc, char **argv)
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| 262 | {
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| 263 | getopt32(argv, "cfvdt");
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| 264 | argv += optind;
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| 265 | /* if called as zcat */
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| 266 | if (applet_name[1] == 'c')
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| 267 | option_mask32 |= OPT_STDOUT;
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| 268 |
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| 269 | return bbunpack(argv, make_new_name_gunzip, unpack_gunzip);
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| 270 | }
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| 271 |
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| 272 | #endif
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| 273 |
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| 274 |
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| 275 | /*
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| 276 | * Small lzma deflate implementation.
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| 277 | * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
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| 278 | *
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| 279 | * Based on bunzip.c from busybox
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| 280 | *
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| 281 | * Licensed under GPL v2, see file LICENSE in this tarball for details.
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| 282 | */
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| 283 |
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| 284 | #if ENABLE_UNLZMA
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| 285 |
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| 286 | static
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| 287 | char* make_new_name_unlzma(char *filename)
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| 288 | {
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| 289 | return make_new_name_generic(filename, "lzma");
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| 290 | }
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| 291 |
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| 292 | static
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| 293 | USE_DESKTOP(long long) int unpack_unlzma(void)
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| 294 | {
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| 295 | return unpack_lzma_stream(STDIN_FILENO, STDOUT_FILENO);
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| 296 | }
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| 297 |
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| 298 | int unlzma_main(int argc, char **argv);
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| 299 | int unlzma_main(int argc, char **argv)
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| 300 | {
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| 301 | getopt32(argv, "cf");
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| 302 | argv += optind;
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| 303 | /* lzmacat? */
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| 304 | if (applet_name[4] == 'c')
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| 305 | option_mask32 |= OPT_STDOUT;
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| 306 |
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| 307 | return bbunpack(argv, make_new_name_unlzma, unpack_unlzma);
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| 308 | }
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| 309 |
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| 310 | #endif
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| 311 |
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| 312 |
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| 313 | /*
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| 314 | * Uncompress applet for busybox (c) 2002 Glenn McGrath
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| 315 | *
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| 316 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 317 | */
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| 318 |
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| 319 | #if ENABLE_UNCOMPRESS
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| 320 |
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| 321 | static
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| 322 | char* make_new_name_uncompress(char *filename)
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| 323 | {
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| 324 | return make_new_name_generic(filename, "Z");
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| 325 | }
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| 326 |
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| 327 | static
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| 328 | USE_DESKTOP(long long) int unpack_uncompress(void)
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| 329 | {
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| 330 | USE_DESKTOP(long long) int status = -1;
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| 331 |
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| 332 | if ((xread_char(STDIN_FILENO) != 0x1f) || (xread_char(STDIN_FILENO) != 0x9d)) {
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| 333 | bb_error_msg("invalid magic");
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| 334 | } else {
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| 335 | status = uncompress(STDIN_FILENO, STDOUT_FILENO);
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| 336 | }
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| 337 | return status;
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| 338 | }
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| 339 |
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| 340 | int uncompress_main(int argc, char **argv);
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| 341 | int uncompress_main(int argc, char **argv)
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| 342 | {
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| 343 | getopt32(argv, "cf");
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| 344 | argv += optind;
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| 345 |
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| 346 | return bbunpack(argv, make_new_name_uncompress, unpack_uncompress);
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| 347 | }
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| 348 |
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| 349 | #endif
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