From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/genchecksum.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 121 insertions(+) create mode 100644 gcc/genchecksum.c (limited to 'gcc/genchecksum.c') 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 +. */ + +#include "bconfig.h" +#include "system.h" +#include "md5.h" + +static void +usage (void) +{ + fputs ("Usage: genchecksums ...\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; +} -- cgit v1.2.3