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/**
* mds — A micro-display server
* Copyright © 2014, 2015, 2016, 2017 Mattias Andrée (maandree@kth.se)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MDS_MDS_SERVER_INTERCEPTION_CONDITION_H
#define MDS_MDS_SERVER_INTERCEPTION_CONDITION_H
#include <stddef.h>
#include <stdint.h>
#define INTERCEPTION_CONDITION_T_VERSION 0
/**
* A condition for a message being intercepted by a client
*/
typedef struct interception_condition
{
/**
* The header of messages to intercept, optionally with a value,
* empty (most not be NULL) for all messages.
*/
char *condition;
/**
* The hash of the header of messages to intercept
*/
size_t header_hash;
/**
* The interception priority. The client should be
* consistent with the priority for conditions that
* are not mutually exclusive.
*/
int64_t priority;
/**
* Whether the messages may get modified by the client
*/
int modifying;
} interception_condition_t;
/**
* Calculate the buffer size need to marshal an interception condition
*
* @param this The interception condition
* @return The number of bytes to allocate to the output buffer
*/
__attribute__((pure, nonnull))
size_t interception_condition_marshal_size(const interception_condition_t *restrict this);
/**
* Marshals an interception condition
*
* @param this The interception condition
* @param data Output buffer for the marshalled data
* @return The number of bytes that have been written (everything will be written)
*/
__attribute__((nonnull))
size_t interception_condition_marshal(const interception_condition_t *restrict this, char *restrict data);
/**
* Unmarshals an interception condition
*
* @param this Memory slot in which to store the new interception condition
* @param data In buffer with the marshalled data
* @return Zero on error, `errno` will be set accordingly, otherwise the
* number of read bytes. Destroy the interception condition on error.
*/
__attribute__((nonnull))
size_t interception_condition_unmarshal(interception_condition_t *restrict this, char *restrict data);
/**
* Pretend to an interception condition
*
* @param data In buffer with the marshalled data
* @return The number of read bytes
*/
__attribute__((pure, nonnull))
size_t interception_condition_unmarshal_skip(char *restrict data);
#endif
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