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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: clib/src/crc32_main.c $ */
/* */
/* OpenPOWER FFS Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2014,2015 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#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", (uint32_t)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;
}
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