arch/all-pc/boot/grub2-aros/util/grub-macho2img.c

   1 /* macho2img.c - tool to convert Mach-O to raw imagw.  */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2009 Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <config.h>
  21
  22 #include <grub/types.h>
  23 #include <grub/macho.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <stdlib.h>
  27
  28 /* Please don't internationalise this file. It's pointless.  */
  29
  30 /* XXX: this file assumes particular Mach-O layout and does no checks. */
  31 /* However as build system ensures correct usage of this tool this
  32    shouldn't be a problem. */
  33
  34 int
  35 main (int argc, char **argv)
  36 {
  37   FILE *in, *out;
  38   int do_bss = 0;
  39   char *buf;
  40   int bufsize;
  41   struct grub_macho_header32 *head;
  42   struct grub_macho_segment32 *curcmd;
  43   unsigned i;
  44   unsigned bssstart = 0;
  45   unsigned bssend = 0;
  46
  47   if (argc && strcmp (argv[1], "--bss") == 0)
  48     do_bss = 1;
  49   if (argc < 2 + do_bss)
  50     {
  51       printf ("Usage: %s [--bss] filename.exec filename.img\n"
  52               "Convert Mach-O into raw image\n", argv[0]);
  53       return 0;
  54     }
  55   in = fopen (argv[1 + do_bss], "rb");
  56   if (! in)
  57     {
  58       printf ("Couldn't open %s\n", argv[1 + do_bss]);
  59       return 1;
  60     }
  61   out = fopen (argv[2 + do_bss], "wb");
  62   if (! out)
  63     {
  64       fclose (in);
  65       printf ("Couldn't open %s\n", argv[2 + do_bss]);
  66       return 2;
  67     }
  68   fseek (in, 0, SEEK_END);
  69   bufsize = ftell (in);
  70   fseek (in, 0, SEEK_SET);
  71   buf = malloc (bufsize);
  72   if (! buf)
  73     {
  74       fclose (in);
  75       fclose (out);
  76       printf ("Couldn't allocate buffer\n");
  77       return 3;
  78     }
  79   fread (buf, 1, bufsize, in);
  80   head = (struct grub_macho_header32 *) buf;
  81   if (grub_le_to_cpu32 (head->magic) != GRUB_MACHO_MAGIC32)
  82     {
  83       fclose (in);
  84       fclose (out);
  85       free (buf);
  86       printf ("Invalid Mach-O file\n");
  87       return 4;
  88     }
  89   curcmd = (struct grub_macho_segment32 *) (buf + sizeof (*head));
  90   for (i = 0; i < grub_le_to_cpu32 (head->ncmds); i++,
  91          curcmd = (struct grub_macho_segment32 *)
  92          (((char *) curcmd) + curcmd->cmdsize))
  93     {
  94       if (curcmd->cmd != GRUB_MACHO_CMD_SEGMENT32)
  95         continue;
  96       fwrite (buf + grub_le_to_cpu32 (curcmd->fileoff), 1,
  97               grub_le_to_cpu32 (curcmd->filesize), out);
  98       if (grub_le_to_cpu32 (curcmd->vmsize)
  99           > grub_le_to_cpu32 (curcmd->filesize))
 100         {
 101           bssstart = grub_le_to_cpu32 (curcmd->vmaddr)
 102             + grub_le_to_cpu32 (curcmd->filesize) ;
 103           bssend = grub_le_to_cpu32 (curcmd->vmaddr)
 104             + grub_le_to_cpu32 (curcmd->vmsize) ;
 105         }
 106     }
 107   if (do_bss)
 108     {
 109       grub_uint32_t tmp;
 110       fseek (out, 0x5c, SEEK_SET);
 111       tmp = grub_cpu_to_le32 (bssstart);
 112       fwrite (&tmp, 4, 1, out);
 113       tmp = grub_cpu_to_le32 (bssend);
 114       fwrite (&tmp, 4, 1, out);
 115     }
 116   fclose (in);
 117   fclose (out);
 118   printf("macho2img complete\n");
 119   return 0;
 120 }