/* 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 . */ #include #include #include #include #include #include /* 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 = grub_util_fopen (argv[1 + do_bss], "rb"); if (! in) { printf ("Couldn't open %s\n", argv[1 + do_bss]); return 1; } out = grub_util_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; }