typedef unsigned char u8;
typedef unsigned short u16;

struct s {
	u8 anchor[5];
	u16 table_length;
};

void some_function(int x);

void other_function(const struct s *pointer)
{
	u8 checksum = 0;
	const u8 *ptr = (const u8 *)(pointer);

	for (unsigned int i = 0; i < sizeof(*pointer); ++i)
		checksum = (checksum + ptr[i]) & 0xFF;

	some_function((int)checksum);
}