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/* Copyright (C) 2011-2017 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 contrib
* @{
*/
#pragma once
#include <stdint.h>
#include <string.h>
#if defined(__linux__) || defined(__gnu_hurd__) || \
(defined(__FreeBSD_kernel__) && defined(__GLIBC__))
# include <endian.h>
# ifndef be64toh
# include <arpa/inet.h>
# include <byteswap.h>
# if BYTE_ORDER == LITTLE_ENDIAN
# define be16toh(x) ntohs(x)
# define be32toh(x) ntohl(x)
# define be64toh(x) bswap_64 (x)
# define le16toh(x) (x)
# define le32toh(x) (x)
# define le64toh(x) (x)
# else
# define be16toh(x) (x)
# define be32toh(x) (x)
# define be64toh(x) (x)
# define le16toh(x) ntohs(x)
# define le32toh(x) ntohl(x)
# define le64toh(x) bswap_64 (x)
# endif
# endif
#elif defined(__FreeBSD__) || defined(__NetBSD__)
# include <sys/endian.h>
#elif defined(__OpenBSD__)
# include <endian.h>
#elif defined(__APPLE__)
# include <libkern/OSByteOrder.h>
# define be16toh(x) OSSwapBigToHostInt16(x)
# define be32toh(x) OSSwapBigToHostInt32(x)
# define be64toh(x) OSSwapBigToHostInt64(x)
# define htobe16(x) OSSwapHostToBigInt16(x)
# define htobe32(x) OSSwapHostToBigInt32(x)
# define htobe64(x) OSSwapHostToBigInt64(x)
# define le16toh(x) OSSwapLittleToHostInt16(x)
# define le32toh(x) OSSwapLittleToHostInt32(x)
# define le64toh(x) OSSwapLittleToHostInt64(x)
# define htole16(x) OSSwapHostToLittleInt16(x)
# define htole32(x) OSSwapHostToLittleInt32(x)
# define htole64(x) OSSwapHostToLittleInt64(x)
#endif
/*!
* \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 wire_read_u16(const uint8_t *pos)
{
return be16toh(*(uint16_t *)pos);
}
/*!
* \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 wire_read_u32(const uint8_t *pos)
{
return be32toh(*(uint32_t *)pos);
}
/*!
* \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 wire_read_u48(const uint8_t *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 wire_read_u64(const uint8_t *pos)
{
return be64toh(*(uint64_t *)pos);
}
/*!
* \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 wire_write_u16(uint8_t *pos, uint16_t data)
{
*(uint16_t *)pos = htobe16(data);
}
/*!
* \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 wire_write_u32(uint8_t *pos, uint32_t data)
{
*(uint32_t *)pos = htobe32(data);
}
/*!
* \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 wire_write_u48(uint8_t *pos, uint64_t data)
{
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 wire_write_u64(uint8_t *pos, uint64_t data)
{
*(uint64_t *)pos = htobe64(data);
}
/*! @} */
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