utilities/mvlextract.c

   1 /*
   2  * Written 1999 Jan 29 by Josh Cogliati
   3  * Modified for mvl by Bradley Bell, 2002, 2003
   4  * This program is licensed under the terms of the GPL, version 2 or later
   5  */
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <fcntl.h>
  13
  14 #define SWAPINT(x)   (((x)<<24) | (((unsigned int)(x)) >> 24) | (((x) &0x0000ff00) << 8) | (((x) & 0x00ff0000) >> 8))
  15
  16 #define MAX_FILES 256
  17
  18 int
  19 main(int argc, char *argv[])
  20 {
  21         FILE *mvlfile, *writefile;
  22         int i, nfiles, len[MAX_FILES];
  23         char filename[MAX_FILES][13];
  24         char *buf;
  25         struct stat statbuf;
  26         int v = 0;
  27         int bigendian = 0;
  28
  29         if (argc > 1 && !strcmp(argv[1], "v")) {
  30                 v = 1;
  31                 argc--;
  32                 argv++;
  33         }
  34
  35         if (argc < 2) {
  36                 printf("Usage: mvlextract [v] mvlfile [filename]\n"
  37                        "extracts all the files in mvlfile into the current directory\n"
  38                            "Options:\n"
  39                            "  v    View files, don't extract\n");
  40                 exit(0);
  41         }
  42         mvlfile = fopen(argv[1], "r");
  43         stat(argv[1], &statbuf);
  44         printf("%i\n", (int)statbuf.st_size);
  45         buf = (char *)malloc(4);
  46         fread(buf, 4, 1, mvlfile);
  47         fread(&nfiles, 4, 1, mvlfile);
  48         printf("%d files\n", nfiles);
  49         if (nfiles > MAX_FILES) { // must be a bigendian mvl
  50                 fprintf(stderr, "warning: nfiles>%d, trying reverse byte order...",
  51                                 MAX_FILES);
  52                 bigendian = 1;
  53         }
  54         if (bigendian)
  55                 nfiles = SWAPINT(nfiles);
  56         printf("Extracting from: %s\n", argv[1]);
  57         free(buf);
  58         for (i = 0; i < nfiles; i++) {
  59                 fread(filename[i], 13, 1, mvlfile);
  60                 fread(&len[i], 4, 1, mvlfile);
  61                 if (bigendian)
  62                         len[i] = SWAPINT(len[i]);
  63                 if (argc == 2 || !strcmp(argv[2], filename[i]))
  64                         printf("Filename: %s \tLength: %i\n", filename[i], len[i]);
  65         }
  66
  67         if (!v) {
  68                 for (i = 0; i < nfiles; i++) {
  69                         if (argc > 2 && strcmp(argv[2], filename[i]))
  70                                 fseek(mvlfile, len[i], SEEK_CUR);
  71                         else {
  72                                 if (ftell(mvlfile) > statbuf.st_size) {
  73                                         printf("Error, end of file\n");
  74                                         exit(1);
  75                                 }
  76                                 buf = (char *)malloc(len[i]);
  77                                 if (buf == NULL) {
  78                                         printf("Unable to allocate memory\n");
  79                                 } else {
  80                                         fread(buf, len[i], 1, mvlfile);
  81                                         writefile = fopen(filename[i], "w");
  82                                         fwrite(buf, len[i], 1, writefile);
  83                                         fclose(writefile);
  84                                         free(buf);
  85                                 }
  86                         }
  87                 }
  88         }
  89         fclose(mvlfile);
  90
  91         return 0;
  92 }