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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