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Add endianness conversion template functions.

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King_DuckZ 2017-06-21 20:53:27 +01:00
parent 7bcdb10d19
commit c92f132007
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include/duckhandy/endianness.hpp Normal file
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/* Copyright 2016, 2017 Michele Santullo
* This file is part of "duckhandy".
*
* "duckhandy" 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.
*
* "duckhandy" 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 "duckhandy". If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef id1A975372553B45BC8C4E42CDBDD97497
#define id1A975372553B45BC8C4E42CDBDD97497
#include <cstdint>
#include <endian.h>
namespace dhandy {
template <typename T> constexpr T htobe (T parV);
template <typename T> constexpr T htole (T parV);
template <typename T> constexpr T betoh (T parV);
template <typename T> constexpr T letoh (T parV);
template <>
[[gnu::pure]] inline constexpr uint8_t htobe (uint8_t parV) {
return parV;
}
template <>
[[gnu::pure]] inline constexpr uint16_t htobe (uint16_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return parV;
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return __builtin_bswap16(parV);
#else
# error "Unsupported endianness"
#endif
}
template <>
[[gnu::pure]] inline constexpr uint32_t htobe (uint32_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return parV;
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return __builtin_bswap32(parV);
#else
# error "Unsupported endianness"
#endif
}
template <>
[[gnu::pure]] inline constexpr uint64_t htobe (uint64_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return parV;
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return __builtin_bswap64(parV);
#else
# error "Unsupported endianness"
#endif
}
template <>
[[gnu::pure]] inline constexpr int8_t htobe (int8_t parV) {
return parV;
}
template <>
[[gnu::pure]] inline constexpr int16_t htobe (int16_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return parV;
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return static_cast<int16_t>(__builtin_bswap16(static_cast<uint16_t>(parV)));
#else
# error "Unsupported endianness"
#endif
}
template <>
[[gnu::pure]] inline constexpr int32_t htobe (int32_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return parV;
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return static_cast<int32_t>(__builtin_bswap32(static_cast<uint32_t>(parV)));
#else
# error "Unsupported endianness"
#endif
}
template <>
[[gnu::pure]] inline constexpr int64_t htobe (int64_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return parV;
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return static_cast<int64_t>(__builtin_bswap64(static_cast<uint64_t>(parV)));
#else
# error "Unsupported endianness"
#endif
}
template <>
[[gnu::pure]] inline constexpr uint8_t htole (uint8_t parV) {
return parV;
}
template <>
[[gnu::pure]] inline constexpr uint16_t htole (uint16_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return __builtin_bswap16(parV);
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return parV;
#else
# error "Unsupported endianness"
#endif
}
template <>
[[gnu::pure]] inline constexpr uint32_t htole (uint32_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return __builtin_bswap32(parV);
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return parV;
#else
# error "Unsupported endianness"
#endif
}
template <>
[[gnu::pure]] inline constexpr uint64_t htole (uint64_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return __builtin_bswap64(parV);
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return parV;
#else
# error "Unsupported endianness"
#endif
}
template <>
[[gnu::pure]] inline constexpr int8_t htole (int8_t parV) {
return parV;
}
template <>
[[gnu::pure]] inline constexpr int16_t htole (int16_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return static_cast<int16_t>(__builtin_bswap16(static_cast<uint16_t>(parV)));
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return parV;
#else
# error "Unsupported endianness"
#endif
}
template <>
[[gnu::pure]] inline constexpr int32_t htole (int32_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return static_cast<int32_t>(__builtin_bswap32(static_cast<uint32_t>(parV)));
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return parV;
#else
# error "Unsupported endianness"
#endif
}
template <>
[[gnu::pure]] inline constexpr int64_t htole (int64_t parV) {
#if __BYTE_ORDER == __BIG_ENDIAN
return static_cast<int64_t>(__builtin_bswap64(static_cast<uint64_t>(parV)));
#elif __BYTE_ORDER == __LITTLE_ENDIAN
return parV;
#else
# error "Unsupported endianness"
#endif
}
template <typename T>
[[gnu::pure]] inline constexpr T betoh (T parV) {
return htobe<T>(parV);
}
template <typename T>
[[gnu::pure]] inline constexpr T letoh (T parV) {
return htole<T>(parV);
}
} //namespace dhandy
#endif