#include "save_header.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char **argv) {
  if (argc != 3) return 2;
  char *end = NULL;
  unsigned long requested = strtoul(argv[2], &end, 10);
  if (!end || *end || requested > 1024 * 1024 + 1) return 2;
  uint8_t *guarded = malloc(requested + 16);
  if (!guarded) return 2;
  memset(guarded, 0xa5, requested + 16);
  int status = factorio_save_prefix(argv[1], guarded + 8, requested);
  for (unsigned i=0;i<8;++i) {
    if (guarded[i] != 0xa5 || guarded[requested+8+i] != 0xa5) return 3;
  }
  if (status) for (unsigned long i=0;i<requested;++i) if (guarded[i+8]!=0xa5) return 4;
  printf("{\"status\":%d,\"prefix_hex\":\"", status);
  if (!status) for (unsigned long i=0;i<requested;++i) printf("%02x",guarded[i+8]);
  puts("\"}");
  free(guarded);
  return status ? 1 : 0;
}