path: root/src/mds-server/queued_interception.c

/**
 * mds — A micro-display server
 * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
 * 
 * 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/>.
 */
#include "queued_interception.h"

#include <libmdsserver/macros.h>


/**
 * Calculate the buffer size need to marshal a queued interception
 * 
 * @param   this  The client information
 * @return        The number of bytes to allocate to the output buffer
 */
size_t queued_interception_marshal_size(void)
{
  return sizeof(int64_t) + 2 * sizeof(int);
}


/**
 * Marshals a queued interception
 * 
 * @param   this  The queued interception
 * @param   data  Output buffer for the marshalled data
 * @return        The number of bytes that have been written (everything will be written)
 */
size_t queued_interception_marshal(const queued_interception_t* restrict this, char* restrict data)
{
  buf_set_next(data, int64_t, this->priority);
  buf_set_next(data, int, this->modifying);
  buf_set_next(data, int, this->client->socket_fd);
  return queued_interception_marshal_size();
}


/**
 * Unmarshals a queued interception
 * 
 * @param   this  Memory slot in which to store the new queued interception
 * @param   data  In buffer with the marshalled data
 * @return        Zero on error, errno will be set accordingly, otherwise the number of read bytes.
 */
size_t queued_interception_unmarshal(queued_interception_t* restrict this, char* restrict data)
{
  this->client = NULL;
  buf_get_next(data, int64_t, this->priority);
  buf_get_next(data, int, this->modifying);
  buf_get_next(data, int, this->socket_fd);
  return queued_interception_marshal_size();
}


/**
 * Pretend to unmarshal a queued interception
 * 
 * @param   data  In buffer with the marshalled data
 * @return        The number of read bytes
 */
size_t queued_interception_unmarshal_skip(void)
{
  return queued_interception_marshal_size();
}