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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.
*
*/
#include <common.h>
#include <command.h>
#include <fs.h>
#include <getopt.h>
#include <malloc.h>
#include <environment.h>
static int crc_from_file(const char* file, ulong *crc)
{
char * buf;
buf= read_file(file, NULL);
if (!buf)
return -ENOMEM;
*crc = simple_strtoul(buf, NULL, 16);
return 0;
}
static int do_crc(int argc, char *argv[])
{
loff_t start = 0, size = ~0;
ulong crc = 0, vcrc = 0, total = 0;
char *filename = "/dev/mem";
#ifdef CONFIG_CMD_CRC_CMP
char *vfilename = NULL;
#endif
int opt, err = 0, filegiven = 0, verify = 0;
while((opt = getopt(argc, argv, "f:F:v:V:")) > 0) {
switch(opt) {
case 'f':
filename = optarg;
filegiven = 1;
break;
#ifdef CONFIG_CMD_CRC_CMP
case 'F':
verify = 1;
vfilename = optarg;
break;
#endif
case 'v':
verify = 1;
vcrc = simple_strtoul(optarg, NULL, 0);
break;
case 'V':
if (!crc_from_file(optarg, &vcrc))
verify = 1;
break;
default:
return COMMAND_ERROR_USAGE;
}
}
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;
}
}
if (file_crc(filename, start, size, &crc, &total) < 0)
return 1;
printf("CRC32 for %s 0x%08lx ... 0x%08lx ==> 0x%08lx",
filename, (ulong)start, (ulong)start + total - 1, crc);
#ifdef CONFIG_CMD_CRC_CMP
if (vfilename) {
size = total;
puts("\n");
if (file_crc(vfilename, start, size, &vcrc, &total) < 0)
return 1;
}
#endif
if (verify && crc != vcrc) {
printf(" != 0x%08lx ** ERROR **", vcrc);
err = 1;
}
printf("\n");
return err;
}
BAREBOX_CMD_HELP_START(crc)
BAREBOX_CMD_HELP_USAGE("crc32 [OPTION] [AREA]\n")
BAREBOX_CMD_HELP_SHORT("Calculate a crc32 checksum of a memory area.\n")
BAREBOX_CMD_HELP_OPT ("-f <file>", "Use file instead of memory.\n")
#ifdef CONFIG_CMD_CRC_CMP
BAREBOX_CMD_HELP_OPT ("-F <file>", "Use file to compare.\n")
#endif
BAREBOX_CMD_HELP_OPT ("-v <crc>", "Verify\n")
BAREBOX_CMD_HELP_OPT ("-V <file>", "Verify with crc read from <file>\n")
BAREBOX_CMD_HELP_END
BAREBOX_CMD_START(crc32)
.cmd = do_crc,
.usage = "crc32 checksum calculation",
BAREBOX_CMD_GROUP(CMD_GRP_MEM)
BAREBOX_CMD_HELP(cmd_crc_help)
BAREBOX_CMD_END
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