utilities/hogextract.c

   1 /*
   2  * Written 1999 Jan 29 by Josh Cogliati
   3  * Modified by Bradley Bell, 2002, 2003
   4  * This program is licensed under the terms of the GPL, version 2 or later
   5  */
   6
   7 #ifdef HAVE_CONFIG_H
   8 #include <conf.h>
   9 #endif
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16 #include <fcntl.h>
  17
  18 #define SWAPINT(x)   (((x)<<24) | (((uint)(x)) >> 24) | (((x) &0x0000ff00) << 8) | (((x) & 0x00ff0000) >> 8))
  19
  20 int
  21 main(int argc, char *argv[])
  22 {
  23         FILE *hogfile, *writefile;
  24         int len;
  25         char filename[13];
  26         char *buf;
  27         struct stat statbuf;
  28         int v = 0;
  29
  30         if (argc > 1 && !strcmp(argv[1], "v")) {
  31                 v = 1;
  32                 argc--;
  33                 argv++;
  34         }
  35
  36         if (argc < 2) {
  37                 printf("Usage: hogextract [v] hogfile [filename]\n"
  38                        "extracts all the files in hogfile into the current directory\n"
  39                            "Options:\n"
  40                            "  v    View files, don't extract\n");
  41                 exit(0);
  42         }
  43         hogfile = fopen(argv[1], "rb");
  44         stat(argv[1], &statbuf);
  45         printf("%i\n", (int)statbuf.st_size);
  46         buf = (char *)malloc(3);
  47         fread(buf, 3, 1, hogfile);
  48         printf("Extracting from: %s\n", argv[1]);
  49         free(buf);
  50         while(ftell(hogfile)<statbuf.st_size) {
  51                 fread(filename, 13, 1, hogfile);
  52                 fread(&len, 1, 4, hogfile);
  53 #ifdef WORDS_BIGENDIAN
  54                 len = SWAPINT(len);
  55 #endif
  56                 if (argc > 2 && strcmp(argv[2], filename))
  57                         fseek(hogfile, len, SEEK_CUR);
  58                 else {
  59                         printf("Filename: %s \tLength: %i\n", filename, len);
  60                         if (v)
  61                                 fseek(hogfile, len, SEEK_CUR);
  62                         else {
  63                                 buf = (char *)malloc(len);
  64                                 if (buf == NULL) {
  65                                         printf("Unable to allocate memory\n");
  66                                 } else {
  67                                         fread(buf, len, 1, hogfile);
  68                                         writefile = fopen(filename, "wb");
  69                                         fwrite(buf, len, 1, writefile);
  70                                         fclose(writefile);
  71                                         free(buf);
  72                                 }
  73                         }
  74                 }
  75         }
  76         fclose(hogfile);
  77
  78         return 0;
  79 }