utilities/mvlextract.c

   1 /*
   2  * Written 1999 Jan 29 by Josh Cogliati
   3  * I grant this program to public domain.
   4  *
   5  * Modified for mvl by Bradley Bell, 2002
   6  * All modifications under GPL, version 2 or later
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <sys/types.h>
  12 #include <sys/stat.h>
  13 #include <fcntl.h>
  14
  15 #define SWAPINT(x)   (((x)<<24) | (((uint)(x)) >> 24) | (((x) &0x0000ff00) << 8) | (((x) & 0x00ff0000) >> 8))
  16
  17 #define MAX_FILES 256
  18
  19 int
  20 main(int argc, char *argv[])
  21 {
  22         FILE *mvlfile, *writefile;
  23         int i, nfiles, len[MAX_FILES];
  24         char filename[MAX_FILES][13];
  25         char *buf;
  26         struct stat statbuf;
  27         int v = 0;
  28         int bigendian = 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: mvlextract [v] mvlfile [filename]\n"
  38                        "extracts all the files in mvlfile into the current directory\n"
  39                            "Options:\n"
  40                            "  v    View files, don't extract\n");
  41                 exit(0);
  42         }
  43         mvlfile = fopen(argv[1], "r");
  44         stat(argv[1], &statbuf);
  45         printf("%i\n", (int)statbuf.st_size);
  46         buf = (char *)malloc(4);
  47         fread(buf, 4, 1, mvlfile);
  48         fread(&nfiles, 4, 1, mvlfile);
  49         printf("%d files\n", nfiles);
  50         if (nfiles > MAX_FILES) // must be a bigendian mvl
  51                 bigendian = 1;
  52         if (bigendian)
  53                 nfiles = SWAPINT(nfiles);
  54         printf("Extracting from: %s\n", argv[1]);
  55         free(buf);
  56         for (i = 0; i < nfiles; i++) {
  57                 fread(filename[i], 13, 1, mvlfile);
  58                 fread(&len[i], 4, 1, mvlfile);
  59                 if (bigendian)
  60                         len[i] = SWAPINT(len[i]);
  61                 if (argc == 2 || !strcmp(argv[2], filename[i]))
  62                         printf("Filename: %s \tLength: %i\n", filename[i], len[i]);
  63         }
  64
  65         if (!v) {
  66                 for (i = 0; i < nfiles; i++) {
  67                         if (argc > 2 && strcmp(argv[2], filename[i]))
  68                                 fseek(mvlfile, len[i], SEEK_CUR);
  69                         else {
  70                                 if (ftell(mvlfile) > statbuf.st_size) {
  71                                         printf("Error, end of file\n");
  72                                         exit(1);
  73                                 }
  74                                 buf = (char *)malloc(len[i]);
  75                                 if (buf == NULL) {
  76                                         printf("Unable to allocate memory\n");
  77                                 } else {
  78                                         fread(buf, len[i], 1, mvlfile);
  79                                         writefile = fopen(filename[i], "w");
  80                                         fwrite(buf, len[i], 1, writefile);
  81                                         fclose(writefile);
  82                                         free(buf);
  83                                 }
  84                         }
  85                 }
  86         }
  87         fclose(mvlfile);
  88
  89         return 0;
  90 }