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+/* Copyright 2019 Advens
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef DARWIN_PROTOCOL_H
+#define DARWIN_PROTOCOL_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <stddef.h>
+#include <netinet/in.h>
+
+#define DARWIN_FILTER_CODE_NO 0x00000000
+// the default certitude list size, which is 1, to allow FMAs (see flexible array members on C99) for both C and C++
+// code
+#define DEFAULT_CERTITUDE_LIST_SIZE 1
+
+ /// Represent the receiver of the results.
+ ///
+ /// \enum darwin_response_type
+ enum darwin_filter_response_type
+ {
+ DARWIN_RESPONSE_SEND_NO = 0, //!< Don't send results to anybody.
+ DARWIN_RESPONSE_SEND_BACK, //!< Send results back to caller.
+ DARWIN_RESPONSE_SEND_DARWIN, //!< Send results to the next filter.
+ DARWIN_RESPONSE_SEND_BOTH, //!< Send results to both caller and the next filter.
+ };
+
+ /// Represent the type of information sent.
+ ///
+ /// \enum darwin_packet_type
+ enum darwin_packet_type
+ {
+ DARWIN_PACKET_OTHER = 0, //!< Information sent by something else.
+ DARWIN_PACKET_FILTER, //!< Information sent by another filter.
+ };
+
+ /// First packet to be sent to a filter.
+ ///
+ /// \struct darwin_filter_packet_t
+ typedef struct
+ {
+ enum darwin_packet_type type; //!< The type of information sent.
+ enum darwin_filter_response_type response; //!< Whom the response will be sent to.
+ long filter_code; //!< The unique identifier code of a filter.
+ size_t body_size; //!< The complete size of the the parameters to be sent
+ unsigned char evt_id[16]; //!< An array containing the event ID
+ size_t certitude_size; //!< The size of the list containing the certitudes.
+ unsigned int certitude_list[DEFAULT_CERTITUDE_LIST_SIZE];
+ //!< The scores or the certitudes of the module. May be used to pass other info in specific cases.
+ } darwin_filter_packet_t;
+
+#ifdef __cplusplus
+};
+#endif
+
+#endif /* !DARWIN_PROTOCOL_H */