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/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
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 <https://www.gnu.org/licenses/>.
*/
/*!
* \file
*
* \brief Wire integer operations.
*
* \addtogroup wire
* @{
*/
#pragma once
#include <assert.h>
#include <stdint.h>
#include <string.h>
#include "libknot/endian.h"
/*!
* \brief Reads 2 bytes from the wireformat data.
*
* \param pos Data to read the 2 bytes from.
*
* \return The 2 bytes read, in host byte order.
*/
inline static uint16_t knot_wire_read_u16(const uint8_t *pos)
{
assert(pos);
uint16_t result;
memcpy(&result, pos, sizeof(result));
return be16toh(result);
}
/*!
* \brief Reads 4 bytes from the wireformat data.
*
* \param pos Data to read the 4 bytes from.
*
* \return The 4 bytes read, in host byte order.
*/
inline static uint32_t knot_wire_read_u32(const uint8_t *pos)
{
assert(pos);
uint32_t result;
memcpy(&result, pos, sizeof(result));
return be32toh(result);
}
/*!
* \brief Reads 6 bytes from the wireformat data.
*
* \param pos Data to read the 6 bytes from.
*
* \return The 6 bytes read, in host byte order.
*/
inline static uint64_t knot_wire_read_u48(const uint8_t *pos)
{
assert(pos);
uint64_t input = 0;
memcpy((uint8_t *)&input + 1, pos, 6);
return be64toh(input) >> 8;
}
/*!
* \brief Read 8 bytes from the wireformat data.
*
* \param pos Data to read the 8 bytes from.
*
* \return The 8 bytes read, in host byte order.
*/
inline static uint64_t knot_wire_read_u64(const uint8_t *pos)
{
assert(pos);
uint64_t result;
memcpy(&result, pos, sizeof(result));
return be64toh(result);
}
/*!
* \brief Writes 2 bytes in wireformat.
*
* The data are stored in network byte order (big endian).
*
* \param pos Position where to put the 2 bytes.
* \param data Data to put.
*/
inline static void knot_wire_write_u16(uint8_t *pos, uint16_t data)
{
assert(pos);
uint16_t beval = htobe16(data);
memcpy(pos, &beval, sizeof(beval));
}
/*!
* \brief Writes 4 bytes in wireformat.
*
* The data are stored in network byte order (big endian).
*
* \param pos Position where to put the 4 bytes.
* \param data Data to put.
*/
inline static void knot_wire_write_u32(uint8_t *pos, uint32_t data)
{
assert(pos);
uint32_t beval = htobe32(data);
memcpy(pos, &beval, sizeof(beval));
}
/*!
* \brief Writes 6 bytes in wireformat.
*
* The data are stored in network byte order (big endian).
*
* \param pos Position where to put the 4 bytes.
* \param data Data to put.
*/
inline static void knot_wire_write_u48(uint8_t *pos, uint64_t data)
{
assert(pos);
uint64_t swapped = htobe64(data << 8);
memcpy(pos, (uint8_t *)&swapped + 1, 6);
}
/*!
* \brief Writes 8 bytes in wireformat.
*
* The data are stored in network byte order (big endian).
*
* \param pos Position where to put the 8 bytes.
* \param data Data to put.
*/
inline static void knot_wire_write_u64(uint8_t *pos, uint64_t data)
{
assert(pos);
uint64_t beval = htobe64(data);
memcpy(pos, &beval, sizeof(beval));
}
/*! @} */
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