1 /* Generate checksums of executables for PCH validation 2 Copyright (C) 2005, 2007, 2009 3 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it under 8 the terms of the GNU General Public License as published by the Free 9 Software Foundation; either version 3, or (at your option) any later 10 version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 20 21 #include "bconfig.h" 22 #include "system.h" 23 #include "md5.h" 24 25 static void 26 usage (void) 27 { 28 fputs ("Usage: genchecksums <filename>\n", stderr); 29 } 30 31 static void 32 dosum (const char *file) 33 { 34 FILE *f; 35 unsigned char result[16]; 36 int i; 37 38 f = fopen (file, "rb"); 39 if (!f) 40 { 41 fprintf (stderr, "opening %s: %s\n", file, xstrerror (errno)); 42 exit (1); 43 } 44 45 /* Some executable formats have timestamps in the first 16 bytes, yuck. */ 46 if (fseek (f, 16, SEEK_SET) != 0) 47 { 48 fprintf (stderr, "seeking in %s: %s\n", file, xstrerror (errno)); 49 exit (1); 50 } 51 52 if (md5_stream (f, result) != 0 53 || fclose (f) != 0) 54 { 55 fprintf (stderr, "reading %s: %s\n", file, xstrerror (errno)); 56 exit (1); 57 } 58 59 puts ("#include \"config.h\""); 60 puts ("#include \"system.h\""); 61 fputs ("EXPORTED_CONST unsigned char executable_checksum[16] = { ", stdout); 62 for (i = 0; i < 16; i++) 63 printf ("%#02x%s", result[i], i == 15 ? " };\n" : ", "); 64 } 65 66 int 67 main (int argc, char ** argv) 68 { 69 if (argc != 2) 70 { 71 usage (); 72 return 1; 73 } 74 75 dosum (argv[1]); 76 77 return 0; 78 } 79