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/*
* Usurpation – wearable device udp packet handling
*
* Copyright (C) 2019 Ramūnas Mažeikis
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; version 2.1
* of the License.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include "net.h"
#include "protocol.h"
#include "protocol_private.h"
#include "protocol_device_private.h"
#include "settings.h"
#define READ_AS(type, from) (*((type*)(from)))
static struct connection_t connection;
cd_t protocol_init(void)
{
connection.is_live = 1;
connection.nd = net_init(setting_port());
return 0;
}
int clear_data(cd_t cd)
{
int ret = 0;
if (cd >= MAX_CONNECTIONS) {
ret = E_IVALID_DESCRIPTOR;
} else {
connection.inp_crs = 0;
}
return ret;
}
static int push_bytes(cd_t cd, const char *data, size_t size)
{
int ret = 0;
if (cd >= MAX_CONNECTIONS) {
ret = E_IVALID_DESCRIPTOR;
} else if (connection.outp_crs + size >= sizeof(connection.outp_buf)) {
ret = E_PACKET_OVERFLOW;
} else {
memcpy(connection.outp_buf, data, size);
connection.outp_crs += size;
}
return ret;
}
static int push_tlv_header(cd_t cd, enum tlv_type type, size_t size)
{
int ret = 0;
if (cd >= MAX_CONNECTIONS) {
errno = E_IVALID_DESCRIPTOR;
ret = NULL;
} else if (connection.outp_crs >= MAX_PACKET_SIZE_IN) {
errno = E_TLV_OVERFLOW;
ret = NULL;
} else {
READ_AS(enum tlv_type, connection.outp_buf + connection.outp_crs)
= type;
connection.outp_crs += sizeof(enum tlv_type);
READ_AS(size_t, connection.outp_buf + connection.outp_crs) = size;
connection.outp_crs += sizeof(size_t);
}
return ret;
}
struct tlv * get_tlv(cd_t cd)
{
struct tlv *ret = &connection.next_tlv;
size_t offset = connection.inp_crs;
char *data = connection.inp_buf;
if (cd >= MAX_CONNECTIONS) {
errno = E_IVALID_DESCRIPTOR;
ret = NULL;
} else if (offset >= MAX_PACKET_SIZE_IN) {
errno = E_TLV_OVERFLOW;
ret = NULL;
} else {
ret->type = READ_AS(enum tlv_type, data + offset);
offset += sizeof(enum tlv_type);
ret->length = READ_AS(size_t, data + offset);
offset += sizeof(size_t);
ret->data = data + offset;
connection.inp_crs = offset;
}
return ret;
}
int flush_data(cd_t cd)
{
return 0;
}
int get_last_data(cd_t cd)
{
if (cd >= MAX_CONNECTIONS) {
return E_IVALID_DESCRIPTOR;
}
net_getlastdata(connection.nd, connection.inp_buf);
}
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