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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* Protocol Control Information of FRCT
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#include <ouroboros/frct_pci.h>
#include <ouroboros/hash.h>
#include <ouroboros/errno.h>
#include <assert.h>
#include <string.h>
#define TYPE_SIZE 1
#define SEQNO_SIZE 8
#define FLAGS_SIZE 1
#define CONF_FLAGS_SIZE 1
#define BASE_SIZE TYPE_SIZE + FLAGS_SIZE + SEQNO_SIZE
#define CONFIG_SIZE CONF_FLAGS_SIZE
static size_t get_head_len(struct frct_pci * pci)
{
size_t len = BASE_SIZE;
if (pci->type & PDU_TYPE_CONFIG)
len += CONFIG_SIZE;
return len;
}
int frct_pci_ser(struct shm_du_buff * sdb,
struct frct_pci * pci,
bool error_check)
{
uint8_t * head;
uint8_t * tail;
size_t len;
size_t offset = 0;
assert(sdb);
assert(pci);
len = get_head_len(pci);
head = shm_du_buff_head_alloc(sdb, len);
if (head == NULL)
return -EPERM;
memcpy(head, &pci->type, TYPE_SIZE);
offset += TYPE_SIZE;
memcpy(head + offset, &pci->flags, FLAGS_SIZE);
offset += FLAGS_SIZE;
memcpy(head + offset, &pci->seqno, SEQNO_SIZE);
offset += SEQNO_SIZE;
if (pci->type & PDU_TYPE_CONFIG) {
memcpy(head + offset, &pci->conf_flags, CONF_FLAGS_SIZE);
/* offset += CONF_FLAGS_SIZE; */
}
if (error_check) {
tail = shm_du_buff_tail_alloc(sdb, hash_len(HASH_CRC32));
if (tail == NULL) {
shm_du_buff_head_release(sdb, len);
return -EPERM;
}
*((uint32_t *) tail) = 0;
mem_hash(HASH_CRC32, (uint32_t *) tail, head, tail - head);
}
return 0;
}
int frct_pci_des(struct shm_du_buff * sdb,
struct frct_pci * pci,
bool error_check)
{
uint8_t * head;
uint8_t * tail;
uint32_t crc;
uint32_t crc2;
size_t offset = 0;
assert(sdb);
assert(pci);
head = shm_du_buff_head(sdb);
/* Depending on the type a different deserialization. */
memcpy(&pci->type, head, TYPE_SIZE);
offset += TYPE_SIZE;
memcpy(&pci->flags, head + offset, FLAGS_SIZE);
offset += FLAGS_SIZE;
memcpy(&pci->seqno, head + offset, SEQNO_SIZE);
offset += SEQNO_SIZE;
if (pci->type & PDU_TYPE_CONFIG) {
memcpy(&pci->conf_flags, head + offset, CONF_FLAGS_SIZE);
/* offset += CONF_FLAGS_SIZE; */
}
if (error_check) {
tail = shm_du_buff_tail(sdb);
if (tail == NULL)
return -EPERM;
mem_hash(HASH_CRC32, &crc, head,
tail - head - hash_len(HASH_CRC32));
memcpy(&crc2, tail - hash_len(HASH_CRC32),
hash_len(HASH_CRC32));
/* Corrupted SDU. */
if (crc != crc2)
return -1;
shm_du_buff_tail_release(sdb, hash_len(HASH_CRC32));
}
shm_du_buff_head_release(sdb, get_head_len(pci));
return 0;
}
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