mkfs.hive.c

#include "hive-internals.h"
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <endian.h>

void checksum(struct regf_header *head) {
	uint32_t *p = (uint32_t *)head;
	head->csum = 0;
	while((char *)p - (char *)head < 508) head->csum ^= le32toh(*p++);
}

int main(int argc, char **argv) {
	if(argc < 2) {
		fprintf(stderr, "Usage: %s [-n] <path>\n", argv[0]);
		return -1;
	}
	int open_flags = O_WRONLY;
	int fd = open(argv[1], open_flags, 0666);
	if(fd == -1) {
		perror(argv[1]);
		return 1;
	}
	off_t file_size = lseek(fd, 0, SEEK_END);
	if(file_size == (off_t)-1) {
		perror("lseek");
		return 1;
	}
	lseek(fd, 0, SEEK_SET);
	struct regf_header head = {
		.magic = "regf",
		.major_ver = 1,
		.offset = 0x20,
		.blocks = file_size - 0x1000,
	};
	checksum(&head);
	int s = write(fd, &head, sizeof head);
	if(s < 0) {
		perror("write");
		return 1;
	}
	return 0;
}