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