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/*
* Copyright (c) 2017, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <arpa/inet.h>
#include <stddef.h>
#include "avtp.h"
#include "util.h"
#define SHIFT_SUBTYPE (31 - 7)
#define SHIFT_VERSION (31 - 11)
#define MASK_SUBTYPE (BITMASK(8) << SHIFT_SUBTYPE)
#define MASK_VERSION (BITMASK(3) << SHIFT_VERSION)
int avtp_pdu_get(const struct avtp_common_pdu *pdu, enum avtp_field field,
uint32_t *val)
{
uint32_t bitmap, mask;
uint8_t shift;
if (!pdu || !val)
return -EINVAL;
switch (field) {
case AVTP_FIELD_SUBTYPE:
mask = MASK_SUBTYPE;
shift = SHIFT_SUBTYPE;
break;
case AVTP_FIELD_VERSION:
mask = MASK_VERSION;
shift = SHIFT_VERSION;
break;
default:
return -EINVAL;
}
bitmap = ntohl(pdu->subtype_data);
*val = BITMAP_GET_VALUE(bitmap, mask, shift);
return 0;
}
int avtp_pdu_set(struct avtp_common_pdu *pdu, enum avtp_field field,
uint32_t value)
{
uint32_t bitmap, mask;
uint8_t shift;
if (!pdu)
return -EINVAL;
switch (field) {
case AVTP_FIELD_SUBTYPE:
mask = MASK_SUBTYPE;
shift = SHIFT_SUBTYPE;
break;
case AVTP_FIELD_VERSION:
mask = MASK_VERSION;
shift = SHIFT_VERSION;
break;
default:
return -EINVAL;
}
bitmap = ntohl(pdu->subtype_data);
BITMAP_SET_VALUE(bitmap, value, mask, shift);
pdu->subtype_data = htonl(bitmap);
return 0;
}
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