gistfile1.mm

static uint64_t count = 7;

static NSString *suffixes[7] = {@"B", @"KiB", @"MiB", @"GiB", @"TiB", @"PiB", @"EiB"};
uint64_t i, c;

for (i = 1024, c = 0; i < (count << 60); i <<= 10, c++){
	if (bytes < i)
		return [NSString stringWithFormat:@"%0.2f%@", 
			(double)bytes / (double)(i >> 10), suffixes[c]];
}
return @"Big";