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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /gcc/genchecksum.c
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Diffstat (limited to 'gcc/genchecksum.c')
-rw-r--r--gcc/genchecksum.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/gcc/genchecksum.c b/gcc/genchecksum.c
new file mode 100644
index 000000000..e0c71f4fe
--- /dev/null
+++ b/gcc/genchecksum.c
@@ -0,0 +1,121 @@
+/* Generate checksums of executables for PCH validation
+ Copyright (C) 2005, 2007, 2009, 2010
+ Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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 GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+#include "bconfig.h"
+#include "system.h"
+#include "md5.h"
+
+static void
+usage (void)
+{
+ fputs ("Usage: genchecksums <filename> ...\n", stderr);
+}
+
+/* Important: BLOCKSIZE must be a multiple of 64. */
+#define BLOCKSIZE 4096
+
+static void
+dosum (struct md5_ctx *ctx, const char *file)
+{
+ FILE *f;
+ char buffer[BLOCKSIZE + 72];
+ size_t sum;
+
+ f = fopen (file, "rb");
+ if (!f)
+ {
+ fprintf (stderr, "opening %s: %s\n", file, xstrerror (errno));
+ exit (1);
+ }
+
+ /* Some executable formats have timestamps in the first 16 bytes, yuck. */
+ if (fseek (f, 16, SEEK_SET) != 0)
+ {
+ fprintf (stderr, "seeking in %s: %s\n", file, xstrerror (errno));
+ exit (1);
+ }
+
+ /* Iterate over full file contents. */
+ while (1)
+ {
+ /* We read the file in blocks of BLOCKSIZE bytes. One call of the
+ computation function processes the whole buffer so that with the
+ next round of the loop another block can be read. */
+ size_t n;
+ sum = 0;
+
+ /* Read block. Take care for partial reads. */
+ do
+ {
+ n = fread (buffer + sum, 1, BLOCKSIZE - sum, f);
+
+ sum += n;
+ }
+ while (sum < BLOCKSIZE && n != 0);
+ if (n == 0 && ferror (f))
+ exit (1);
+
+ /* If end of file is reached, end the loop. */
+ if (n == 0)
+ break;
+
+ /* Process buffer with BLOCKSIZE bytes. Note that
+ BLOCKSIZE % 64 == 0
+ */
+ md5_process_block (buffer, BLOCKSIZE, ctx);
+ }
+
+ /* Add the last bytes if necessary. */
+ if (sum > 0)
+ md5_process_bytes (buffer, sum, ctx);
+
+ if (fclose (f) != 0)
+ {
+ fprintf (stderr, "reading %s: %s\n", file, xstrerror (errno));
+ exit (1);
+ }
+}
+
+int
+main (int argc, char ** argv)
+{
+ struct md5_ctx ctx;
+ unsigned char result[16];
+ int i;
+
+ if (argc < 2)
+ {
+ usage ();
+ return 1;
+ }
+
+ md5_init_ctx (&ctx);
+ for (i = 1; i < argc; i++)
+ dosum (&ctx, argv[i]);
+ md5_finish_ctx (&ctx, result);
+
+ puts ("#include \"config.h\"");
+ puts ("#include \"system.h\"");
+ fputs ("EXPORTED_CONST unsigned char executable_checksum[16] = { ", stdout);
+ for (i = 0; i < 16; i++)
+ printf ("0x%02x%s", result[i], i == 15 ? " };\n" : ", ");
+
+ return 0;
+}