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 <errno.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <fcntl.h>
  30 #include <string.h>
  31 #include <sys/types.h>
  32 #ifndef _MSC_VER
  33 #include <unistd.h>
  34 #else
  35 #include <io.h>
  36 #endif
  37
  38 typedef struct {
  39     char filename[12];
  40     unsigned int offset;
  41     unsigned int size;
  42 } DirEntry;
  43
  44 #ifndef O_BINARY
  45 #define O_BINARY 0
  46 #endif
  47
  48 int main(int argc, char **argv)
  49 {
  50     int fd;
  51     DirEntry *datafile;
  52     int num_entries, i;
  53
  54     if (argc < 2) {
  55         printf("dumbass, specify filename to unpack\n");
  56         exit(1);
  57     }
  58
  59     fd = open(argv[1], O_RDONLY | O_BINARY);
  60     if (fd == -1) {
  61         perror("open datafile");
  62         exit(1);
  63     }
  64     /* get number of entries */
  65     read(fd, &num_entries, 4);
  66
  67     printf("%d entries in datafile\n", num_entries);
  68
  69     datafile = calloc(num_entries, sizeof(DirEntry));
  70     read(fd, datafile, num_entries * sizeof(DirEntry));
  71     printf("Directory Listing:\n");
  72     for (i = 0; i < num_entries; i++) {
  73         char filename[14];
  74         memset(filename, 0, sizeof(filename));
  75         strncpy(filename, datafile[i].filename, 12);
  76         printf("%02d:\t%s (%u bytes)\n", i, filename,
  77                 datafile[i].size);
  78     }
  79
  80     for (i = 0; i < num_entries; i++) {
  81         int outfd;
  82         char filename[14];
  83         char *buf;
  84         memset(filename, 0, sizeof(filename));
  85         strncpy(filename, datafile[i].filename, 12);
  86         printf("Extracting %s ", filename);
  87         fflush(stdout);
  88
  89         if (unlink(filename) == -1 && errno != ENOENT) {
  90             perror("cannot unlink file");
  91             exit(1);
  92         }
  93         outfd = open(filename, O_RDWR | O_CREAT | O_EXCL | O_BINARY, 0644);
  94         if (!outfd) {
  95             perror("cant open file");
  96             exit(1);
  97         }
  98         lseek(fd, datafile[i].offset, SEEK_SET);
  99         buf = calloc(1, datafile[i].size + 16);
 100         read(fd, buf, datafile[i].size);
 101         write(outfd, buf, datafile[i].size);
 102         close(outfd);
 103         free(buf);
 104         printf("OK\n");
 105     }
 106     close(fd);
 107     return 0;
 108 }