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/*
* crc.c - Calculate a crc32 checksum of a memory area
*
* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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 <common.h>
#include <command.h>
#include <fs.h>
#include <getopt.h>
#include <fcntl.h>
#include <errno.h>
#include <xfuncs.h>
#include <malloc.h>
#include <linux/ctype.h>
static int do_crc (cmd_tbl_t *cmdtp, int argc, char *argv[])
{
ulong start = 0, size = ~0, total = 0;
ulong crc = 0, vcrc = 0;
char *filename = "/dev/mem";
char *buf;
int fd, opt, err = 0, filegiven = 0, verify = 0, now;
while((opt = getopt(argc, argv, "f:v:")) > 0) {
switch(opt) {
case 'f':
filename = optarg;
filegiven = 1;
break;
case 'v':
verify = 1;
vcrc = simple_strtoul(optarg, NULL, 0);
break;
}
}
if (!filegiven && optind == argc)
return COMMAND_ERROR_USAGE;
if (optind < argc) {
if (parse_area_spec(argv[optind], &start, &size)) {
printf("could not parse area description: %s\n", argv[optind]);
return 1;
}
}
fd = open(filename, O_RDONLY);
if (fd < 0) {
printf("open %s: %s\n", filename, errno_str());
return 1;
}
if (lseek(fd, start, SEEK_SET) == -1) {
perror("lseek");
err = 1;
goto out;
}
buf = xmalloc(4096);
while (size) {
now = min((ulong)4096, size);
now = read(fd, buf, now);
if (now < 0) {
perror("read");
goto out_free;
}
if (!now)
break;
crc = crc32(crc, buf, now);
size -= now;
total += now;
}
printf ("CRC32 for %s 0x%08lx ... 0x%08lx ==> 0x%08lx",
filename, start, start + total - 1, crc);
if (verify && crc != vcrc) {
printf(" != 0x%08x ** ERROR **", vcrc);
err = 1;
}
printf("\n");
out_free:
free(buf);
out:
close(fd);
return err;
}
static const __maybe_unused char cmd_crc_help[] =
"Usage: crc32 [OPTION] [AREA]\n"
"Calculate a crc32 checksum of a memory area\n"
"Options:\n"
" -f <file> Use file instead of memory\n"
" -v <crc> Verfify\n";
U_BOOT_CMD_START(crc32)
.cmd = do_crc,
.usage = "crc32 checksum calculation",
U_BOOT_CMD_HELP(cmd_crc_help)
U_BOOT_CMD_END
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