/*
 * fc32.c - A sample program for the use with fast CRC-32 routines.
 * It calculates the CRC-32 of a file.
 *
 * Copyright 1999 G. Adam Stanislav.
 * All rights reserved.
 */
#include <stdio.h>
#include "crc32.h"

#define	BUFFERSIZE	1024

unsigned char buffer[BUFFERSIZE];

int main(int argc, char *argv[]) {
	FILE *file;
	unsigned int crc = initcrc32();

	if (argc > 2) {
		fprintf(stderr, "FC32 Usage: fc32 [file]\n");
		return 1;
	}

	if (argc == 2) {
		file = fopen(argv[1], "r");
		if (file == NULL) {
			fprintf(stderr, "FC32: Can't open %s\n", argv[1]);
			return 2;
		}
	}
	else
		file = stdin;

	while (!feof(file))
		crc = partialcrc32(crc,
			buffer,
			fread(buffer,
				sizeof(unsigned char),
				BUFFERSIZE,
				file));

	if (file != stdin)
		fclose(file);

	printf("CRC-32 = %08x\n", finishcrc32(crc));
	return 0;
}