Method peek_frame_data

lib_acl_cpp/src/http/websocket.cpp:649–680

}

int websocket::peek_frame_data(char* buf, size_t size)
{
	if (payload_nread_ >= header_.payload_len) {
		reset();
		return 0;
	}

	if (header_.payload_len < payload_nread_ + size) {
		size = (size_t) (header_.payload_len - payload_nread_);
	}

	// ���δ������Ҫ��������Ҷ���������Ϊ�գ��򷵻�-1
	// readn_peek ����������Ϊ true Ҫ���ڲ��Զ���ջ�����
	if (!client_.readn_peek(peek_buf_, size, true) && peek_buf_->empty()) {
		return -1;
	}

	acl_assert(!peek_buf_->empty());

	size_t len = peek_buf_->size();
	memcpy(buf, peek_buf_->c_str(), len);

	if (header_.mask) {
		unsigned char* mask = (unsigned char*) &header_.masking_key;
		for (size_t i = 0; i < len; i++) {
			buf[i] ^= mask[(payload_nread_ + i) % 4];
		}
	}

	payload_nread_ += len;
	return (int) len;
}

int websocket::peek_frame_data(string& buf, size_t size)
{