modify/jnbunpack.c

   1 /*
   2  * unpack.c
   3  * Copyright (C) 1998 Brainchild Design - http://brainchilddesign.com/
   4  *
   5  * Copyright (C) 2001 "timecop" <timecop@japan.co.jp>
   6  *
   7  * Copyright (C) 2002 Florian Schulze <crow@icculus.org>
   8  *
   9  * This file is part of Jump'n'Bump.
  10  *
  11  * Jump'n'Bump is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * Jump'n'Bump is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <fcntl.h>
  29 #include <string.h>
  30 #include <sys/types.h>
  31 #ifndef _MSC_VER
  32 #include <unistd.h>
  33 #else
  34 #include <io.h>
  35 #endif
  36
  37 typedef struct {
  38     char filename[12];
  39     unsigned int offset;
  40     unsigned int size;
  41 } DirEntry;
  42
  43 #ifndef O_BINARY
  44 #define O_BINARY 0
  45 #endif
  46
  47 int main(int argc, char **argv)
  48 {
  49     int fd;
  50     DirEntry *datafile;
  51     int num_entries, i;
  52
  53     if (argc < 2) {
  54         printf("dumbass, specify filename to unpack\n");
  55         exit(1);
  56     }
  57
  58     fd = open(argv[1], O_RDONLY | O_BINARY);
  59     if (fd == -1) {
  60         perror("open datafile");
  61         exit(1);
  62     }
  63     /* get number of entries */
  64     read(fd, &num_entries, 4);
  65
  66     printf("%d entries in datafile\n", num_entries);
  67
  68     datafile = calloc(num_entries, sizeof(DirEntry));
  69     read(fd, datafile, num_entries * sizeof(DirEntry));
  70     printf("Directory Listing:\n");
  71     for (i = 0; i < num_entries; i++) {
  72         char filename[14];
  73         memset(filename, 0, sizeof(filename));
  74         strncpy(filename, datafile[i].filename, 12);
  75         printf("%02d:\t%s (%u bytes)\n", i, filename,
  76                 datafile[i].size);
  77     }
  78
  79     for (i = 0; i < num_entries; i++) {
  80         int outfd;
  81         char filename[14];
  82         char *buf;
  83         memset(filename, 0, sizeof(filename));
  84         strncpy(filename, datafile[i].filename, 12);
  85         printf("Extracting %s ", filename);
  86
  87         outfd = open(filename, O_RDWR | O_CREAT | O_BINARY, 0644);
  88         if (!outfd) {
  89             perror("cant open file");
  90             exit(1);
  91         }
  92         lseek(fd, datafile[i].offset, SEEK_SET);
  93         buf = calloc(1, datafile[i].size + 16);
  94         read(fd, buf, datafile[i].size);
  95         write(outfd, buf, datafile[i].size);
  96         close(outfd);
  97         free(buf);
  98         printf("OK\n");
  99     }
 100     close(fd);
 101     return 0;
 102 }