diff options
Diffstat (limited to '')
| -rw-r--r-- | util/grub-macho2img.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/util/grub-macho2img.c b/util/grub-macho2img.c new file mode 100644 index 0000000..6dfb5fc --- /dev/null +++ b/util/grub-macho2img.c @@ -0,0 +1,120 @@ +/* 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> + +/* Please don't internationalise this file. It's pointless. */ + +/* 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; +} |