static size_t bufread_or_die(void *ptr, size_t size, size_t nmemb, ByteRange &buf)
{
size_t read_count = buf.read(static_cast<char *>(ptr), size, nmemb);
if (read_count < nmemb) {
Output("Error: failed to read file (truncated)\n");
abort();
}
return read_count;
}
