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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/>.
*/
#include "multicast.h"
#include "interception-condition.h"
#include <libmdsserver/macros.h>
#include <stdlib.h>
#include <string.h>
/**
* Initialise a message multicast state
*
* @param this The message multicast state
*/
void
multicast_initialise(multicast_t *restrict this)
{
this->interceptions = NULL;
this->interceptions_count = 0;
this->interceptions_ptr = 0;
this->message = NULL;
this->message_length = 0;
this->message_ptr = 0;
this->message_prefix = 0;
}
/**
* Destroy a message multicast state
*
* @param this The message multicast state
*/
void
multicast_destroy(multicast_t *restrict this)
{
free(this->interceptions);
free(this->message);
}
/**
* Calculate the buffer size need to marshal a message multicast state
*
* @param this The client information
* @return The number of bytes to allocate to the output buffer
*/
size_t
multicast_marshal_size(const multicast_t *restrict this)
{
size_t i, rc = sizeof(int) + 5 * sizeof(size_t) + this->message_length * sizeof(char);
for (i = 0; i < this->interceptions_count; i++)
rc += queued_interception_marshal_size();
return rc;
}
/**
* Marshals a message multicast state
*
* @param this The message multicast state
* @param data Output buffer for the marshalled data
* @return The number of bytes that have been written (everything will be written)
*/
size_t
multicast_marshal(const multicast_t *restrict this, char *restrict data)
{
size_t i, n, rc = sizeof(int) + 5 * sizeof(size_t);
buf_set_next(data, int, MULTICAST_T_VERSION);
buf_set_next(data, size_t, this->interceptions_count);
buf_set_next(data, size_t, this->interceptions_ptr);
buf_set_next(data, size_t, this->message_length);
buf_set_next(data, size_t, this->message_ptr);
buf_set_next(data, size_t, this->message_prefix);
for (i = 0; i < this->interceptions_count; i++) {
n = queued_interception_marshal(this->interceptions + i, data);
data += n / sizeof(char);
rc += n;
}
if (this->message_length > 0) {
memcpy(data, this->message, this->message_length * sizeof(char));
rc += this->message_length * sizeof(char);
}
return rc;
}
/**
* Unmarshals a message multicast state
*
* @param this Memory slot in which to store the new message multicast state
* @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 client information on error.
*/
size_t
multicast_unmarshal(multicast_t *restrict this, char *restrict data)
{
size_t i, n, rc = sizeof(int) + 5 * sizeof(size_t);
this->interceptions = NULL;
this->message = NULL;
/* buf_get_next(data, int, MULTICAST_T_VERSION); */
buf_next(data, int, 1);
buf_get_next(data, size_t, this->interceptions_count);
buf_get_next(data, size_t, this->interceptions_ptr);
buf_get_next(data, size_t, this->message_length);
buf_get_next(data, size_t, this->message_ptr);
buf_get_next(data, size_t, this->message_prefix);
if (this->interceptions_count > 0)
fail_if (xmalloc(this->interceptions, this->interceptions_count, queued_interception_t));
for (i = 0; i < this->interceptions_count; i++) {
n = queued_interception_unmarshal(this->interceptions + i, data);
data += n / sizeof(char);
rc += n;
}
if (this->message_length > 0) {
fail_if (xmemdup(this->message, data, this->message_length, char));
rc += this->message_length * sizeof(char);
}
return rc;
fail:
return 0;
}
/**
* Pretend to unmarshal a message multicast state
*
* @param data In buffer with the marshalled data
* @return The number of read bytes
*/
size_t
multicast_unmarshal_skip(char *restrict data)
{
size_t interceptions_count = buf_cast(data, size_t, 0);
size_t message_length = buf_cast(data, size_t, 2);
size_t n, rc = sizeof(int) + 5 * sizeof(size_t) + message_length * sizeof(char);
while (interceptions_count--) {
n = queued_interception_unmarshal_skip();
data += n / sizeof(char);
rc += n;
}
return rc;
}
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