gistfile1.c

#include <stdio.h>
#include <inttypes.h>

// only works on little-endian machines, i suppose

int main(int argc, char *argv[]) {
	FILE *fp = fopen(argv[1], "rb");
	fseek(fp, 0L, SEEK_END);
	int s = ftell(fp);
	fseek(fp, 0L, SEEK_SET);

	uint32_t p1, p2, p3, p4;
	p1 = p2 = p3 = p4 = 0x11111111;

	uint32_t a1, a2, a3, a4;

	s -= 16;
	while (s > 0) {
		fread(&a1, 4, 1, fp);
		fread(&a2, 4, 1, fp);
		fread(&a3, 4, 1, fp);
		fread(&a4, 4, 1, fp);

		p1 += a1;
		p2 += (p1 < a1) + a2;
		p3 += a3;
		p4 += (p3 < a3) + a4;

		s -= 16;
	}
	fclose(fp);

	printf("%x %x %x %x\n", p1, p2, p3, p4);

	return 0;
}