//
// Created by haraldwolff on 21.08.22.
//

#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <getopt.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <hash.h>

int main(int argc, char *argv[]){

	int f1 = open(argv[1], O_RDWR);
	if (f1 < 0)
	{
		printf("could not open %s (%s)\n", argv[1], strerror(errno));
		exit(EXIT_FAILURE);
	}
	long size1 = lseek(f1, 0, SEEK_END);

	void *mm1 = mmap(NULL, size1, PROT_READ | PROT_WRITE, MAP_SHARED, f1, 0);
	if (mm1 == MAP_FAILED){
		printf("could not mmap file.");
		exit(EXIT_FAILURE);
	}

	int f2 = open(argv[2], O_RDWR);
	if (f2 < 0)
	{
		printf("could not open %s (%s)\n", argv[2], strerror(errno));
		exit(EXIT_FAILURE);
	}
	long size2 = lseek(f2, 0, SEEK_END);

	void *mm2 = mmap(NULL, size2, PROT_READ | PROT_WRITE, MAP_SHARED, f2, 0);
	if (mm2 == MAP_FAILED){
		printf("could not mmap file.");
		exit(EXIT_FAILURE);
	}


	long offset = 0;
	u_int64_t *t1 = (u_int64_t *)mm1;
	u_int64_t *t2 = (u_int64_t *)mm2;

	while (offset < size1) {
		uint64_t h1 = dhash( &t1[(offset >> 3)], 4096);
		uint64_t h2 = dhash( &t2[(offset >> 3)], 4096);

		if (h1 != h2) {
			fprintf(stdout,"\r%0lx %0lx %0lx\n", offset, h1, h2);
			fflush(stdout);
		}

		offset += 4096;

		fprintf(stdout, "\roffset: 0x%llx  %d%%", offset, (100 * offset / size1));
		fflush(stdout);
	}

	munmap(mm1, size1);
	munmap(mm2, size2);

	close(f1);
	close(f2);

}