65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* 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.
|
|
*
|
|
* This code is originated from Samsung Electronics proprietary sources.
|
|
* Author: Viacheslav Vovchenko, <v.vovchenko@samsung.com>
|
|
* Created: 10 Jul 2017
|
|
*
|
|
* Copyright (C) 2016 Samsung Electronics, Inc.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include "five_lv.h"
|
|
|
|
struct lv *lv_get_next(struct lv *field, const void *end)
|
|
{
|
|
size_t lv_len;
|
|
uint8_t *pbegin = (uint8_t *)field;
|
|
const uint8_t *pend = (const uint8_t *)end;
|
|
|
|
if (unlikely(!pbegin || !pend || pbegin >= pend))
|
|
return NULL;
|
|
|
|
/* Check if we can read 'length' field */
|
|
if (unlikely(pend - pbegin < sizeof(field->length)))
|
|
return NULL;
|
|
|
|
lv_len = sizeof(field->length) + field->length;
|
|
/* Check if we can read the value */
|
|
if (unlikely(pend - pbegin < lv_len))
|
|
return NULL;
|
|
|
|
return (struct lv *)(pbegin + lv_len);
|
|
}
|
|
|
|
int lv_set(struct lv *field, const void *data, uint16_t data_len,
|
|
const void *end)
|
|
{
|
|
size_t lv_len;
|
|
uint8_t *pbegin = (uint8_t *)field;
|
|
const uint8_t *pend = (const uint8_t *)end;
|
|
|
|
if (unlikely(!pbegin || !pend))
|
|
return -EINVAL;
|
|
|
|
lv_len = sizeof(field->length) + data_len;
|
|
|
|
if (unlikely(pbegin >= pend || (pend - pbegin < lv_len) ||
|
|
(data_len > 0 && !data)))
|
|
return -EINVAL;
|
|
|
|
field->length = data_len;
|
|
|
|
if (data)
|
|
memcpy(field->value, data, data_len);
|
|
|
|
return 0;
|
|
}
|