From bf4630076762d9c20c16c80c1c791f352b046dd1 Mon Sep 17 00:00:00 2001 From: Brad Bishop Date: Mon, 30 Jun 2014 22:10:16 -0500 Subject: Port FFS tools over from Building Block repository. --- clib/src/crc32_main.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 clib/src/crc32_main.c (limited to 'clib/src/crc32_main.c') diff --git a/clib/src/crc32_main.c b/clib/src/crc32_main.c new file mode 100644 index 0000000..3bdf072 --- /dev/null +++ b/clib/src/crc32_main.c @@ -0,0 +1,76 @@ +/* + * Copyright (c) International Business Machines Corp., 2014 + * + * This program 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 2 of the License, or + * (at your option) any later version. + * + * This program 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 this program. If not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "crc32.h" + +void usage(void) +{ + printf("Usage: crc32 infile\n"); +} + +int main(int argc, const char *argv[]) +{ + if (argc != 2) { + usage(); + return 1; + } + + int fd = open(argv[1], O_RDONLY); + if (fd < 0) { + printf("open %s: %s\n", argv[1], strerror(errno)); + return 1; + } + + struct stat stat; + int rc = fstat(fd, &stat); + if (rc < 0) { + printf("stat %s: %s\n", argv[1], strerror(errno)); + return 1; + } + + off_t filesize = stat.st_size; + + void *in_buf = mmap(NULL, filesize, PROT_READ, MAP_PRIVATE, fd, 0); + if (in_buf == MAP_FAILED) { + /* FIXME could still try to use read().... */ + printf("mmap %d failed: %s\n", filesize, strerror(errno)); + return 1; + } + + rc = close(fd); + if (rc < 0) { + printf("close %s: %s\n", argv[1], strerror(errno)); + return 1; + } + + unsigned long crc32 = memcpy32(NULL, in_buf, filesize); + + printf("%#010lx", crc32), fflush(stdout); + + return 0; +} -- cgit v1.2.1