#ifdef __linux__
 
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>

typedef int os_handle;
typedef size_t os_size; 
typedef ssize_t os_ssize; 
 
#elif defined(_WIN32)
 
#include <windows.h>

typedef HANDLE os_handle;
typedef DWORD os_size;
typedef DWORD os_ssize;
 
#else 
#error "Unknown OS!"
#endif
 
os_ssize os_read(os_handle fd, void *buffer, os_size count);
os_ssize os_write(os_handle fd, const void *buffer, os_size count);