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/* macho2img.c - tool to convert Mach-O to raw imagw. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <grub/types.h>
#include <grub/macho.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/* XXX: this file assumes particular Mach-O layout and does no checks. */
/* However as build system ensures correct usage of this tool this
shouldn't be a problem. */
int
main (int argc, char **argv)
{
FILE *in, *out;
int do_bss = 0;
char *buf;
int bufsize;
struct grub_macho_header32 *head;
struct grub_macho_segment32 *curcmd;
unsigned i;
unsigned bssstart = 0;
unsigned bssend = 0;
if (argc && strcmp (argv[1], "--bss") == 0)
do_bss = 1;
if (argc < 2 + do_bss)
{
printf ("Usage: %s [--bss] filename.exec filename.img\n"
"Convert Mach-O into raw image\n", argv[0]);
return 0;
}
in = fopen (argv[1 + do_bss], "rb");
if (! in)
{
printf ("Couldn't open %s\n", argv[1 + do_bss]);
return 1;
}
out = fopen (argv[2 + do_bss], "wb");
if (! out)
{
fclose (in);
printf ("Couldn't open %s\n", argv[2 + do_bss]);
return 2;
}
fseek (in, 0, SEEK_END);
bufsize = ftell (in);
fseek (in, 0, SEEK_SET);
buf = malloc (bufsize);
if (! buf)
{
fclose (in);
fclose (out);
printf ("Couldn't allocate buffer\n");
return 3;
}
fread (buf, 1, bufsize, in);
head = (struct grub_macho_header32 *) buf;
if (grub_le_to_cpu32 (head->magic) != GRUB_MACHO_MAGIC32)
{
fclose (in);
fclose (out);
free (buf);
printf ("Invalid Mach-O file\n");
return 4;
}
curcmd = (struct grub_macho_segment32 *) (buf + sizeof (*head));
for (i = 0; i < grub_le_to_cpu32 (head->ncmds); i++,
curcmd = (struct grub_macho_segment32 *)
(((char *) curcmd) + curcmd->cmdsize))
{
if (curcmd->cmd != GRUB_MACHO_CMD_SEGMENT32)
continue;
fwrite (buf + grub_le_to_cpu32 (curcmd->fileoff), 1,
grub_le_to_cpu32 (curcmd->filesize), out);
if (grub_le_to_cpu32 (curcmd->vmsize)
> grub_le_to_cpu32 (curcmd->filesize))
{
bssstart = grub_le_to_cpu32 (curcmd->vmaddr)
+ grub_le_to_cpu32 (curcmd->filesize) ;
bssend = grub_le_to_cpu32 (curcmd->vmaddr)
+ grub_le_to_cpu32 (curcmd->vmsize) ;
}
}
if (do_bss)
{
grub_uint32_t tmp;
fseek (out, 0x5c, SEEK_SET);
tmp = grub_cpu_to_le32 (bssstart);
fwrite (&tmp, 4, 1, out);
tmp = grub_cpu_to_le32 (bssend);
fwrite (&tmp, 4, 1, out);
}
fclose (in);
fclose (out);
printf("macho2img complete\n");
return 0;
}
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