int bert_decoder_pull(bert_decoder_t *decoder,size_t size)
{
	size_t remaining_space = (decoder->short_length - decoder->short_index);

	if (size <= remaining_space)
	{
		// we still have enough data in the short buffer
		return BERT_SUCCESS;
	}

	size_t empty_space = BERT_DECODER_EMPTY(decoder);

	if (empty_space >= (BERT_SHORT_BUFFER / 2))
	{
		// fill the remaining space in the short buffer
		goto fill_short_buffer;
	}

	size_t unread_space = (decoder->short_length - decoder->short_index);

	if (unread_space)
	{
		// shift the other half of the short buffer down
		memcpy(decoder->short_buffer,decoder->short_buffer+decoder->short_index,sizeof(unsigned char)*unread_space);
	}

	decoder->short_length = unread_space;
	decoder->short_index = 0;
	empty_space = BERT_DECODER_EMPTY(decoder);

	ssize_t length;

fill_short_buffer:
	length = bert_buffer_read(decoder->short_buffer+decoder->short_length,&(decoder->buffer),empty_space);

	decoder->short_length += length;

	if ((decoder->short_length - decoder->short_index) < size)
	{
		return BERT_ERRNO_EMPTY;
	}
	return BERT_SUCCESS;
}