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