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327
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1
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2 /* Minitar: extract .tar.gz files on Win32 platforms.
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3 Uses zlib for decompression.
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4
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5 This is very simple-minded, it ignores checksums, and any type of file
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6 that is not a plain file or a directory. Nonetheless it is useful.
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7
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8 Author: Charles G. Waldman (cgw@pgt.com), Aug 4 1998
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9
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10 This file is placed in the public domain; you can
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11 do whatever you like with it. There is NO WARRANTY.
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12 If it breaks, you get to keep both pieces */
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13
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14
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2951
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15 #ifdef HAVE_CONFIG_H
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16 # include <config.h>
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17 #endif
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18
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327
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19 #include <stdio.h>
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812
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20 #include <stdlib.h>
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438
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21 #include <errno.h>
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464
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22 #include <string.h>
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23 #include <io.h>
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812
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24 #ifdef WIN32_NATIVE
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25 # include <direct.h> /* For mkdir */
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26 #endif
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327
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27
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28 #include <zlib.h>
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29
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1782
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30 static void
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495
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31 Usage (char *name)
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327
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32 {
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495
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33 fprintf (stderr, "Usage: %s file.tar.gz [base-dir]\n", name);
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34 fprintf (stderr, "\tExtracts the contents compressed tar file to base-dir\n");
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35 exit (-1);
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327
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36 }
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37
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38
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39 #define BLOCKSIZE 512
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40 #define MAXNAMELEN 1024
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41
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464
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42 static int
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495
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43 octal (char *str)
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327
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44 {
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45 int ret = -1;
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495
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46 sscanf (str, "%o", &ret);
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327
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47 return ret;
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48 }
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49
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50 /* this is like mkdir -p, except if there is no trailing slash,
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51 the final component is assumed to be a file, rather than a
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52 path component, so it is not created as a directory */
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53
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464
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54 static int
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495
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55 makepath (char *path)
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327
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56 {
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57 char tmp[MAXNAMELEN];
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58 char *cp;
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59
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495
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60 for (cp=path; cp; cp = (char*)strchr (cp+1, '/'))
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61 {
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62 if (!*cp)
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63 break;
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64 if (*cp != '/')
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65 continue;
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66 strncpy (tmp, path, cp-path);
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67 tmp[cp-path] = '\0';
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68 if (strlen (tmp) == 0)
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69 continue;
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464
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70 #ifdef WIN32_NATIVE
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495
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71 if (mkdir (tmp))
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464
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72 #else
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495
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73 if (mkdir (tmp, 0777))
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464
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74 #endif
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495
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75 {
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76 if (errno == EEXIST)
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77 continue;
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78 else
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79 return -1;
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80 }
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327
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81 }
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82 return 0;
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83 }
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84
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495
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85
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327
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86
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464
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87 int
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495
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88 main (int argc, char **argv)
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327
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89 {
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90 char fullname[MAXNAMELEN];
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91 char *basedir = ".";
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92 char *tarfile;
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93 int size;
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94 char osize[13];
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95 char name[101];
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96 char magic[7];
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97 char type;
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98
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99 gzFile *infile = (gzFile*)0;
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100 FILE *outfile = (FILE*)0;
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101
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102 char block[BLOCKSIZE];
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103 int nbytes, nread, nwritten;
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104
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105 int in_block = 0;
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106 int directory = 0;
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107
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108 if (argc < 2 || argc > 3)
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495
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109 Usage (argv[0]);
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327
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110
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111 tarfile = argv[1];
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112 if (argc==3)
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113 basedir = argv[2];
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114
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495
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115 if (! (infile = gzopen (tarfile, "rb")))
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116 {
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117 fprintf (stderr, "Cannot open %s\n", tarfile);
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118 exit (-2);
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119 }
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327
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120
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495
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121 while (1)
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122 {
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123 nread = gzread (infile, block, 512);
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327
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124
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495
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125 if (!in_block && nread == 0)
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327
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126 break;
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127
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495
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128 if (nread != BLOCKSIZE)
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129 {
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130 fprintf (stderr, "Error: incomplete block read. Exiting.\n");
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131 exit (-2);
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327
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132 }
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133
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495
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134 if (!in_block)
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135 {
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136 if (block[0]=='\0') /* We're done */
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137 break;
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138
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139 strncpy (magic, block+257, 6);
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140 magic[6] = '\0';
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141 if (strcmp (magic, "ustar "))
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142 {
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143 fprintf (stderr,
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144 "Error: incorrect magic number in tar header. Exiting\n");
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1529
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145 exit (-2);
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495
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146 }
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147
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148 strncpy (name, block, 100);
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149 name[100] = '\0';
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150 sprintf (fullname, "%s/%s", basedir, name);
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151 printf ("%s\n", fullname);
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152 type = block[156];
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153
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154 switch (type)
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155 {
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156 case '0':
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157 case '\0':
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158 directory = 0;
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159 break;
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160 case '5':
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161 directory = 1;
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162 break;
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163 default:
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164 fprintf (stderr, "Error: unknown type flag %c. Exiting.\n", type);
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1529
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165 exit (-2);
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495
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166 break;
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167 }
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168
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169 if (directory)
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170 {
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171 in_block = 0;
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172
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173 /* makepath will ignore the final path component, so make sure
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174 dirnames have a trailing slash */
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327
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175
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495
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176 if (fullname[strlen (fullname)-1] != '/')
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177 strcat (fullname, "/");
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178 if (makepath (fullname))
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179 {
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180 fprintf (stderr, "Error: cannot create directory %s. Exiting.\n",
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181 fullname);
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182 exit (-2);
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183 }
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184 continue;
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185 }
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186 else
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187 { /*file */
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188 in_block = 1;
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189 if (outfile)
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190 {
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191 if (fclose (outfile))
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192 {
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193 fprintf (stderr, "Error: cannot close file %s. Exiting.\n",
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194 fullname);
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195 exit (-2);
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196 }
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197 outfile = (FILE*)0;
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198 }
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199
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200 if (!(outfile = fopen (fullname, "wb")))
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201 {
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202 /*try creating the directory, maybe it's not there */
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203 if (makepath (fullname))
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204 {
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205 fprintf (stderr, "Error: cannot create file %s. Exiting.\n",
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206 fullname);
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207 exit (-2);
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208 }
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209 /* now try again to open the file */
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210 if (!(outfile = fopen (fullname, "wb")))
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211 {
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212 fprintf (stderr, "Error: cannot create file %s. Exiting.\n",
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213 fullname);
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214 exit (-2);
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215 }
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216 }
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217
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218 strncpy (osize, block+124, 12);
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219 osize[12] = '\0';
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220 size = octal (osize);
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221 if (size<0)
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222 {
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223 fprintf (stderr, "Error: invalid size in tar header. Exiting.\n");
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224 exit (-2);
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225 }
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1529
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226 if (size==0) /* file of size 0 is done */
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227 in_block = 0;
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495
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228 }
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1782
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229 }
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230 else
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231 { /* write or continue writing file contents */
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495
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232 nbytes = size>512? 512:size;
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327
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233
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495
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234 nwritten = fwrite (block, 1, nbytes, outfile);
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235 if (nwritten != nbytes)
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236 {
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237 fprintf (stderr, "Error: only wrote %d bytes to file %s. Exiting.\n",
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238 nwritten, fullname);
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1529
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239 exit (-2);
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495
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240 }
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241 size -= nbytes;
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242 if (size==0)
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243 in_block = 0;
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244 }
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327
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245 }
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495
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246 return 0;
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247 }
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327
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248
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249
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250
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