125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
/*
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* crc.c - Calculate a crc32 checksum of a memory area
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*
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* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <fs.h>
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#include <getopt.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <xfuncs.h>
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#include <malloc.h>
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#include <linux/ctype.h>
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static int do_crc(struct command *cmdtp, int argc, char *argv[])
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{
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ulong start = 0, size = ~0, total = 0;
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ulong crc = 0, vcrc = 0;
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char *filename = "/dev/mem";
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char *buf;
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int fd, opt, err = 0, filegiven = 0, verify = 0, now;
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while((opt = getopt(argc, argv, "f:v:")) > 0) {
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switch(opt) {
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case 'f':
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filename = optarg;
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filegiven = 1;
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break;
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case 'v':
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verify = 1;
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vcrc = simple_strtoul(optarg, NULL, 0);
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break;
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}
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}
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if (!filegiven && optind == argc)
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return COMMAND_ERROR_USAGE;
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if (optind < argc) {
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if (parse_area_spec(argv[optind], &start, &size)) {
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printf("could not parse area description: %s\n", argv[optind]);
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return 1;
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}
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}
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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printf("open %s: %s\n", filename, errno_str());
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return 1;
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}
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if (start > 0) {
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if (lseek(fd, start, SEEK_SET) == -1) {
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perror("lseek");
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err = 1;
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goto out;
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}
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}
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buf = xmalloc(4096);
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while (size) {
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now = min((ulong)4096, size);
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now = read(fd, buf, now);
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if (now < 0) {
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perror("read");
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goto out_free;
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}
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if (!now)
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break;
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crc = crc32(crc, buf, now);
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size -= now;
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total += now;
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}
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printf ("CRC32 for %s 0x%08lx ... 0x%08lx ==> 0x%08lx",
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filename, start, start + total - 1, crc);
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if (verify && crc != vcrc) {
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printf(" != 0x%08x ** ERROR **", vcrc);
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err = 1;
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}
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printf("\n");
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out_free:
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free(buf);
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out:
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close(fd);
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return err;
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}
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static const __maybe_unused char cmd_crc_help[] =
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"Usage: crc32 [OPTION] [AREA]\n"
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"Calculate a crc32 checksum of a memory area\n"
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"Options:\n"
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" -f <file> Use file instead of memory\n"
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" -v <crc> Verfify\n";
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BAREBOX_CMD_START(crc32)
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.cmd = do_crc,
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.usage = "crc32 checksum calculation",
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BAREBOX_CMD_HELP(cmd_crc_help)
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BAREBOX_CMD_END
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