Read an unsigned big-endian 32-bit integer
#include <uint32.h>
uint32 u;
void uint32_unpack_big(const char s[4],uint32 *u);
uint32 is a 32-bit unsigned integer type, normally either unsigned int or unsigned long.
uint32_unpack_big portably reads a uint32 as stored on a big-endian architecture (i.e. in network byte order) from s and writes it into u in the native byte order.