#include <zlib.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/time.h>


static inline double getdtime(void)
{
	struct timeval tv;

	gettimeofday(&tv, NULL);

	return (double)tv.tv_sec + (double)tv.tv_usec * 0.001 * 0.001;
}

int main(int argc, char * argv[]) {
	char *buf_in, *buf_out;
	unsigned long size_in, size_out;
	int fd;
	double d_start, d_end, d_compress;
	
	if (argc != 3) {
		printf("./command <size_in> <input file>\n");
		exit(1);
	}

	d_compress = 0;

	// buffer for input data
	size_in = atoi(argv[1]);
	buf_in = (char *)malloc(size_in);

	if (!buf_in) {
		printf("malloc failed. %n byten", size_in);
		exit(1);
	}

	// buffer for output data
	size_out = compressBound(size_in);
	buf_out = (char *)malloc(size_out);

	if (!buf_out) {
		printf("malloc failed. %n byten", size_out);
		exit(1);
	}

	if ((fd = open(argv[2], O_RDONLY)) == 0) {
		printf("file open failed. %s\n", argv[2]);
		exit(1);
	}

	while (read(fd, buf_in, size_in)) {
		d_start = getdtime();
		compress2(buf_out, &size_out, buf_in, size_in, Z_BEST_SPEED);
		d_end = getdtime();
		d_compress += d_end - d_start;
	}

	printf("TOTAL COMPRESSION TIME: %lf\n", d_compress);
	return 0;
}