1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Gzip implementation for busybox
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4 | *
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5 | * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly.
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6 | *
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7 | * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de>
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8 | * based on gzip sources
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9 | *
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10 | * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as
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11 | * well as stdin/stdout, and to generally behave itself wrt command line
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12 | * handling.
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13 | *
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14 | * General cleanup to better adhere to the style guide and make use of standard
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15 | * busybox functions by Glenn McGrath <bug1@iinet.net.au>
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16 | *
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17 | * This program is free software; you can redistribute it and/or modify
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18 | * it under the terms of the GNU General Public License as published by
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19 | * the Free Software Foundation; either version 2 of the License, or
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20 | * (at your option) any later version.
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21 | *
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22 | * This program is distributed in the hope that it will be useful,
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23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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25 | * General Public License for more details.
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26 | *
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27 | * You should have received a copy of the GNU General Public License
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28 | * along with this program; if not, write to the Free Software
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29 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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30 | *
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31 | *
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32 | * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface
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33 | * Copyright (C) 1992-1993 Jean-loup Gailly
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34 | * The unzip code was written and put in the public domain by Mark Adler.
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35 | * Portions of the lzw code are derived from the public domain 'compress'
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36 | * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies,
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37 | * Ken Turkowski, Dave Mack and Peter Jannesen.
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38 | *
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39 | * See the license_msg below and the file COPYING for the software license.
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40 | * See the file algorithm.doc for the compression algorithms and file formats.
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41 | */
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42 |
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43 | #if 0
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44 | static char *license_msg[] = {
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45 | " Copyright (C) 1992-1993 Jean-loup Gailly",
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46 | " This program is free software; you can redistribute it and/or modify",
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47 | " it under the terms of the GNU General Public License as published by",
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48 | " the Free Software Foundation; either version 2, or (at your option)",
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49 | " any later version.",
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50 | "",
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51 | " This program is distributed in the hope that it will be useful,",
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52 | " but WITHOUT ANY WARRANTY; without even the implied warranty of",
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53 | " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the",
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54 | " GNU General Public License for more details.",
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55 | "",
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56 | " You should have received a copy of the GNU General Public License",
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57 | " along with this program; if not, write to the Free Software",
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58 | " Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.",
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59 | 0
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60 | };
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61 | #endif
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62 |
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63 | #include <stdlib.h>
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64 | #include <string.h>
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65 | #include <unistd.h>
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66 | #include <sys/types.h>
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67 | #include <sys/stat.h>
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68 | #include <fcntl.h>
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69 |
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70 | #include "busybox.h"
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71 | #include "unarchive.h"
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72 |
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73 | #define GUNZIP_OPT_STDOUT 1
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74 | #define GUNZIP_OPT_FORCE 2
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75 | #define GUNZIP_OPT_TEST 4
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76 | #define GUNZIP_OPT_DECOMPRESS 8
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77 |
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78 | int gunzip_main(int argc, char **argv)
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79 | {
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80 | char status = EXIT_SUCCESS;
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81 | unsigned long opt;
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82 |
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83 | opt = bb_getopt_ulflags(argc, argv, "cftd");
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84 | /* if called as zcat */
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85 | if (strcmp(bb_applet_name, "zcat") == 0) {
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86 | opt |= GUNZIP_OPT_STDOUT;
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87 | }
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88 |
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89 | do {
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90 | struct stat stat_buf;
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91 | const char *old_path = argv[optind];
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92 | const char *delete_path = NULL;
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93 | char *new_path = NULL;
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94 | int src_fd;
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95 | int dst_fd;
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96 |
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97 | optind++;
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98 |
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99 | if (old_path == NULL || strcmp(old_path, "-") == 0) {
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100 | src_fd = STDIN_FILENO;
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101 | opt |= GUNZIP_OPT_STDOUT;
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102 | } else {
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103 | src_fd = bb_xopen(old_path, O_RDONLY);
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104 |
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105 | /* Get the time stamp on the input file. */
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106 | xstat(old_path, &stat_buf);
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107 | }
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108 |
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109 | /* Check that the input is sane. */
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110 | if (isatty(src_fd) && ((opt & GUNZIP_OPT_FORCE) == 0)) {
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111 | bb_error_msg_and_die
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112 | ("compressed data not read from terminal. Use -f to force it.");
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113 | }
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114 |
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115 | /* Set output filename and number */
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116 | if (opt & GUNZIP_OPT_TEST) {
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117 | dst_fd = bb_xopen(bb_dev_null, O_WRONLY); /* why does test use filenum 2 ? */
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118 | } else if (opt & GUNZIP_OPT_STDOUT) {
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119 | dst_fd = STDOUT_FILENO;
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120 | } else {
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121 | char *extension;
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122 |
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123 | new_path = bb_xstrdup(old_path);
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124 |
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125 | extension = strrchr(new_path, '.');
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126 | #ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
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127 | if (extension && (strcmp(extension, ".Z") == 0)) {
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128 | *extension = '\0';
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129 | } else
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130 | #endif
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131 | if (extension && (strcmp(extension, ".gz") == 0)) {
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132 | *extension = '\0';
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133 | } else if (extension && (strcmp(extension, ".tgz") == 0)) {
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134 | extension[2] = 'a';
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135 | extension[3] = 'r';
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136 | } else {
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137 | bb_error_msg_and_die("Invalid extension");
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138 | }
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139 |
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140 | /* Open output file (with correct permissions) */
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141 | dst_fd = bb_xopen3(new_path, O_WRONLY | O_CREAT, stat_buf.st_mode);
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142 |
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143 | /* If unzip succeeds remove the old file */
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144 | delete_path = old_path;
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145 | }
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146 |
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147 | /* do the decompression, and cleanup */
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148 | if (bb_xread_char(src_fd) == 0x1f) {
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149 | unsigned char magic2;
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150 |
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151 | magic2 = bb_xread_char(src_fd);
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152 | #ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS
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153 | if (magic2 == 0x9d) {
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154 | status = uncompress(src_fd, dst_fd);
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155 | } else
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156 | #endif
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157 | if (magic2 == 0x8b) {
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158 | check_header_gzip(src_fd);
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159 | status = inflate_gunzip(src_fd, dst_fd);
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160 | if (status != 0) {
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161 | bb_error_msg_and_die("Error inflating");
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162 | }
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163 | } else {
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164 | bb_error_msg_and_die("Invalid magic");
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165 | }
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166 | } else {
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167 | bb_error_msg_and_die("Invalid magic");
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168 | }
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169 |
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170 | if ((status != EXIT_SUCCESS) && (new_path)) {
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171 | /* Unzip failed, remove new path instead of old path */
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172 | delete_path = new_path;
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173 | }
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174 |
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175 | if (dst_fd != STDOUT_FILENO) {
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176 | close(dst_fd);
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177 | }
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178 | if (src_fd != STDIN_FILENO) {
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179 | close(src_fd);
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180 | }
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181 |
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182 | /* delete_path will be NULL if in test mode or from stdin */
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183 | if (delete_path && (unlink(delete_path) == -1)) {
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184 | bb_error_msg_and_die("Couldn't remove %s", delete_path);
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185 | }
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186 |
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187 | free(new_path);
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188 |
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189 | } while (optind < argc);
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190 |
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191 | return status;
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192 | }
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