133 lines
3.0 KiB
C
133 lines
3.0 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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*/
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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 <malloc.h>
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#include <environment.h>
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static int crc_from_file(const char* file, ulong *crc)
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{
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char * buf;
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buf= read_file(file, NULL);
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if (!buf)
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return -ENOMEM;
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*crc = simple_strtoul(buf, NULL, 16);
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return 0;
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}
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static int do_crc(int argc, char *argv[])
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{
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loff_t start = 0, size = ~0;
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ulong crc = 0, vcrc = 0, total = 0;
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char *filename = "/dev/mem";
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#ifdef CONFIG_CMD_CRC_CMP
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char *vfilename = NULL;
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#endif
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int opt, err = 0, filegiven = 0, verify = 0;
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while((opt = getopt(argc, argv, "f:F:v: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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#ifdef CONFIG_CMD_CRC_CMP
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case 'F':
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verify = 1;
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vfilename = optarg;
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break;
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#endif
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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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case 'V':
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if (!crc_from_file(optarg, &vcrc))
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verify = 1;
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break;
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default:
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return COMMAND_ERROR_USAGE;
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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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if (file_crc(filename, start, size, &crc, &total) < 0)
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return 1;
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printf("CRC32 for %s 0x%08lx ... 0x%08lx ==> 0x%08lx",
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filename, (ulong)start, (ulong)start + total - 1, crc);
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#ifdef CONFIG_CMD_CRC_CMP
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if (vfilename) {
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size = total;
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puts("\n");
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if (file_crc(vfilename, start, size, &vcrc, &total) < 0)
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return 1;
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}
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#endif
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if (verify && crc != vcrc) {
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printf(" != 0x%08lx ** ERROR **", vcrc);
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err = 1;
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}
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printf("\n");
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return err;
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}
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BAREBOX_CMD_HELP_START(crc32)
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BAREBOX_CMD_HELP_TEXT("Calculate a CRC32 checksum of a memory area.")
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BAREBOX_CMD_HELP_TEXT("")
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BAREBOX_CMD_HELP_TEXT("Options:")
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BAREBOX_CMD_HELP_OPT ("-f FILE", "Use file instead of memory.")
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#ifdef CONFIG_CMD_CRC_CMP
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BAREBOX_CMD_HELP_OPT ("-F FILE", "Use file to compare.")
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#endif
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BAREBOX_CMD_HELP_OPT ("-v CRC", "Verify")
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BAREBOX_CMD_HELP_OPT ("-V FILE", "Verify with CRC read from FILE")
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BAREBOX_CMD_HELP_END
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BAREBOX_CMD_START(crc32)
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.cmd = do_crc,
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BAREBOX_CMD_DESC("CRC32 checksum calculation")
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BAREBOX_CMD_OPTS("[-f"
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#ifdef CONFIG_CMD_CRC_CMP
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"F"
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#endif
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"vV] AREA")
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BAREBOX_CMD_GROUP(CMD_GRP_MEM)
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BAREBOX_CMD_HELP(cmd_crc32_help)
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BAREBOX_CMD_END
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