static int rockboxTruncate(sqlite3_file *pFile, sqlite_int64 size){
  int fd = ((rockbox_file *)pFile)->fd;
  int rc;
  long excess = size - rb->filesize(fd);

  if (excess > 0) {
    char buf[excess];
    rb->memset(buf, 0, excess);
    rb->lseek(fd, 0, SEEK_END);
    rc = rb->write(fd, buf, excess);
    if (rc < 0)
      return SQLITE_IOERR_TRUNCATE;
    else
      return SQLITE_OK;
  } else {
    rc = rb->ftruncate(((rockbox_file *)pFile)->fd, (off_t)size);
    if (rc)
      return SQLITE_IOERR_TRUNCATE;
    else
      return SQLITE_OK;
  }
}