#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>

// Define our functions..
unsigned long fileSize(int);
int readBinary(int, char *, unsigned long);
int main(int, char **);

int main(int argc, char **argv) {
	int fd, i;
	unsigned long sz;
	char data[16];

	if ((fd = open("alsample.bin", O_RDONLY)) < 1) {
		fprintf(stderr, "Cannot open alsample.bin: %s\n", 
			strerror(errno));
			exit(1);
	}

	sz = fileSize(fd);

	while((i = readBinary(fd, data, sz))) {
		printf("read %d bytes\n", i);
		sz =- i;
	}
	
	exit(0);
}

// Unsigned long to allow for larger file size..
// Hopefully we won't be given a file more than 2 gigabytes in size..
unsigned long fileSize(int fd) {
	unsigned long sz = 0;
	char c;

	while(read(fd, &c, 1)) {
		sz++;
	}

	lseek(fd, SEEK_SET, 0); // Return to beginning of file.
	return(sz);
}

int readBinary(int fd, char *data, unsigned long sz) {
#ifdef ONE_BYTE_AT_A_TIME
	// Reading one byte at a time is slow, but since you want
	// it that way, here is the code to do it.
	int i;

	for (i=0; i<16; i++,data++) {
		if (read(fd, data, 1) != 1)
			break;
	}
	return(i);
#else
	// Much faster way to do it.
	return(read(fd, data, 16)); 
#endif
	
}