#include "packet.h"
#include <stdlib.h>
#include <stdio.h>
#include <err.h>

int
main(void)
{
   setvbuf(stdout, NULL, _IONBF, 0);

   union packet packet;
   for (size_t psz; (psz = fread(packet.buf, 1, sizeof(packet.hdr), stdin)) > 0;) {
      if (!packet_verify(&packet))
         errx(EXIT_FAILURE, "invalid packet");

      psz += fread(packet.buf + sizeof(packet.hdr), 1, packet.hdr.size - sizeof(packet.hdr), stdin);
      if (psz != packet.hdr.size)
         errx(EXIT_FAILURE, "packet size doesn't match, got %zu, expected %u", psz, packet.hdr.size);

      packet_crypt(&packet);
      fwrite(packet.buf, 1, packet.hdr.size, stdout);
   }

   return EXIT_SUCCESS;
}