Add endianness conversion template functions.
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179
include/duckhandy/endianness.hpp
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179
include/duckhandy/endianness.hpp
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/* Copyright 2016, 2017 Michele Santullo
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* This file is part of "duckhandy".
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*
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* "duckhandy" is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* "duckhandy" is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with "duckhandy". If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef id1A975372553B45BC8C4E42CDBDD97497
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#define id1A975372553B45BC8C4E42CDBDD97497
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#include <cstdint>
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#include <endian.h>
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namespace dhandy {
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template <typename T> constexpr T htobe (T parV);
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template <typename T> constexpr T htole (T parV);
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template <typename T> constexpr T betoh (T parV);
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template <typename T> constexpr T letoh (T parV);
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template <>
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[[gnu::pure]] inline constexpr uint8_t htobe (uint8_t parV) {
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return parV;
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}
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template <>
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[[gnu::pure]] inline constexpr uint16_t htobe (uint16_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return parV;
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return __builtin_bswap16(parV);
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <>
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[[gnu::pure]] inline constexpr uint32_t htobe (uint32_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return parV;
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return __builtin_bswap32(parV);
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <>
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[[gnu::pure]] inline constexpr uint64_t htobe (uint64_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return parV;
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return __builtin_bswap64(parV);
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <>
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[[gnu::pure]] inline constexpr int8_t htobe (int8_t parV) {
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return parV;
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}
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template <>
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[[gnu::pure]] inline constexpr int16_t htobe (int16_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return parV;
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return static_cast<int16_t>(__builtin_bswap16(static_cast<uint16_t>(parV)));
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <>
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[[gnu::pure]] inline constexpr int32_t htobe (int32_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return parV;
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return static_cast<int32_t>(__builtin_bswap32(static_cast<uint32_t>(parV)));
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <>
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[[gnu::pure]] inline constexpr int64_t htobe (int64_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return parV;
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return static_cast<int64_t>(__builtin_bswap64(static_cast<uint64_t>(parV)));
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <>
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[[gnu::pure]] inline constexpr uint8_t htole (uint8_t parV) {
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return parV;
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}
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template <>
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[[gnu::pure]] inline constexpr uint16_t htole (uint16_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return __builtin_bswap16(parV);
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return parV;
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <>
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[[gnu::pure]] inline constexpr uint32_t htole (uint32_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return __builtin_bswap32(parV);
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return parV;
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <>
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[[gnu::pure]] inline constexpr uint64_t htole (uint64_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return __builtin_bswap64(parV);
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return parV;
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <>
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[[gnu::pure]] inline constexpr int8_t htole (int8_t parV) {
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return parV;
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}
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template <>
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[[gnu::pure]] inline constexpr int16_t htole (int16_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return static_cast<int16_t>(__builtin_bswap16(static_cast<uint16_t>(parV)));
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return parV;
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <>
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[[gnu::pure]] inline constexpr int32_t htole (int32_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return static_cast<int32_t>(__builtin_bswap32(static_cast<uint32_t>(parV)));
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return parV;
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <>
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[[gnu::pure]] inline constexpr int64_t htole (int64_t parV) {
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#if __BYTE_ORDER == __BIG_ENDIAN
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return static_cast<int64_t>(__builtin_bswap64(static_cast<uint64_t>(parV)));
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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return parV;
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#else
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# error "Unsupported endianness"
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#endif
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}
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template <typename T>
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[[gnu::pure]] inline constexpr T betoh (T parV) {
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return htobe<T>(parV);
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}
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template <typename T>
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[[gnu::pure]] inline constexpr T letoh (T parV) {
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return htole<T>(parV);
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}
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} //namespace dhandy
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#endif
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@ -3,6 +3,7 @@ project(dhandy_unit_test CXX)
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add_executable(${PROJECT_NAME}
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add_executable(${PROJECT_NAME}
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main.cpp
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main.cpp
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lexical_cast_test.cpp
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lexical_cast_test.cpp
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endianness_test.cpp
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)
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)
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set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
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set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 11)
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set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD_REQUIRED ON)
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set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD_REQUIRED ON)
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120
test/unit/endianness_test.cpp
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120
test/unit/endianness_test.cpp
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@ -0,0 +1,120 @@
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/* Copyright 2017, Michele Santullo
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* This file is part of "duckhandy".
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*
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* "duckhandy" is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* "duckhandy" is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with "duckhandy". If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "catch.hpp"
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#include "duckhandy/endianness.hpp"
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#include <endian.h>
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TEST_CASE ("Host to little-endian", "[htole][endianness]") {
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using dhandy::htole;
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#if __BYTE_ORDER == __BIG_ENDIAN
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static_assert(htole<uint8_t>(0x12) == 0x12, "Wrong conversion");
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static_assert(htole<uint16_t>(0x1234) == 0x3412, "Wrong conversion");
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static_assert(htole<uint32_t>(0x12345678) == 0x78563412, "Wrong conversion");
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static_assert(htole<uint64_t>(0x123456789ABCDEF0) == 0xF0DEBC9A78563412, "Wrong conversion");
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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static_assert(htole<uint8_t>(0x12) == 0x12, "Wrong conversion");
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static_assert(htole<uint16_t>(0x1234) == 0x1234, "Wrong conversion");
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static_assert(htole<uint32_t>(0x12345678) == 0x12345678, "Wrong conversion");
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static_assert(htole<uint64_t>(0x123456789ABCDEF0) == 0x123456789ABCDEF0, "Wrong conversion");
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#endif
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CHECK(htole<uint8_t>(0x12) == 0x12);
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CHECK(htole<uint16_t>(0x1234) == htole16(0x1234));
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CHECK(htole<uint32_t>(0x12345678) == htole32(0x12345678));
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CHECK(htole<uint64_t>(0x123456789ABCDEF0) == htole64(0x123456789ABCDEF0));
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CHECK(htole<int8_t>(0xFE) == static_cast<int8_t>(0xFE));
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CHECK(htole<int16_t>(0xFEDC) == static_cast<int16_t>(htole16(0xFEDC)));
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CHECK(htole<int32_t>(0xFEDCBA09) == static_cast<int32_t>(htole32(0xFEDCBA09)));
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CHECK(htole<int64_t>(0xFEDCBA0987654321) == static_cast<int64_t>(htole64(0xFEDCBA0987654321)));
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}
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TEST_CASE ("Little-endian to host", "[letoh][endianness]") {
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using dhandy::letoh;
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#if __BYTE_ORDER == __BIG_ENDIAN
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static_assert(letoh<uint8_t>(0x12) == 0x12, "Wrong conversion");
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static_assert(letoh<uint16_t>(0x1234) == 0x3412, "Wrong conversion");
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static_assert(letoh<uint32_t>(0x12345678) == 0x78563412, "Wrong conversion");
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static_assert(letoh<uint64_t>(0x123456789ABCDEF0) == 0xF0DEBC9A78563412, "Wrong conversion");
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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static_assert(letoh<uint8_t>(0x12) == 0x12, "Wrong conversion");
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static_assert(letoh<uint16_t>(0x1234) == 0x1234, "Wrong conversion");
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static_assert(letoh<uint32_t>(0x12345678) == 0x12345678, "Wrong conversion");
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static_assert(letoh<uint64_t>(0x123456789ABCDEF0) == 0x123456789ABCDEF0, "Wrong conversion");
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#endif
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CHECK(letoh<uint8_t>(0x12) == 0x12);
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CHECK(letoh<uint16_t>(0x1234) == le16toh(0x1234));
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CHECK(letoh<uint32_t>(0x12345678) == le32toh(0x12345678));
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CHECK(letoh<uint64_t>(0x123456789ABCDEF0) == le64toh(0x123456789ABCDEF0));
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CHECK(letoh<int8_t>(0xFE) == static_cast<int8_t>(0xFE));
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CHECK(letoh<int16_t>(0xFEDC) == static_cast<int16_t>(le16toh(0xFEDC)));
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CHECK(letoh<int32_t>(0xFEDCBA09) == static_cast<int32_t>(le32toh(0xFEDCBA09)));
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CHECK(letoh<int64_t>(0xFEDCBA0987654321) == static_cast<int64_t>(le64toh(0xFEDCBA0987654321)));
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}
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TEST_CASE ("Host to big-endian", "[htobe][endianness]") {
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using dhandy::htobe;
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#if __BYTE_ORDER == __BIG_ENDIAN
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static_assert(htobe<uint8_t>(0x12) == 0x12, "Wrong conversion");
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static_assert(htobe<uint16_t>(0x1234) == 0x1234, "Wrong conversion");
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static_assert(htobe<uint32_t>(0x12345678) == 0x12345678, "Wrong conversion");
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static_assert(htobe<uint64_t>(0x123456789ABCDEF0) == 0x123456789ABCDEF0, "Wrong conversion");
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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static_assert(htobe<uint8_t>(0x12) == 0x12, "Wrong conversion");
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static_assert(htobe<uint16_t>(0x1234) == 0x3412, "Wrong conversion");
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static_assert(htobe<uint32_t>(0x12345678) == 0x78563412, "Wrong conversion");
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static_assert(htobe<uint64_t>(0x123456789ABCDEF0) == 0xF0DEBC9A78563412, "Wrong conversion");
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#endif
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CHECK(htobe<uint8_t>(0x12) == 0x12);
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CHECK(htobe<uint16_t>(0x1234) == htobe16(0x1234));
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CHECK(htobe<uint32_t>(0x12345678) == htobe32(0x12345678));
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CHECK(htobe<uint64_t>(0x123456789ABCDEF0) == htobe64(0x123456789ABCDEF0));
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CHECK(htobe<int8_t>(0xFE) == static_cast<int8_t>(0xFE));
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CHECK(htobe<int16_t>(0xFEDC) == static_cast<int16_t>(htobe16(0xFEDC)));
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CHECK(htobe<int32_t>(0xFEDCBA09) == static_cast<int32_t>(htobe32(0xFEDCBA09)));
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CHECK(htobe<int64_t>(0xFEDCBA0987654321) == static_cast<int64_t>(htobe64(0xFEDCBA0987654321)));
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}
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TEST_CASE ("Big-endian to host", "[betoh][endianness]") {
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using dhandy::betoh;
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#if __BYTE_ORDER == __BIG_ENDIAN
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static_assert(betoh<uint8_t>(0x12) == 0x12, "Wrong conversion");
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static_assert(betoh<uint16_t>(0x1234) == 0x1234, "Wrong conversion");
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static_assert(betoh<uint32_t>(0x12345678) == 0x12345678, "Wrong conversion");
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static_assert(betoh<uint64_t>(0x123456789ABCDEF0) == 0x123456789ABCDEF0, "Wrong conversion");
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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static_assert(betoh<uint8_t>(0x12) == 0x12, "Wrong conversion");
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static_assert(betoh<uint16_t>(0x1234) == 0x3412, "Wrong conversion");
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static_assert(betoh<uint32_t>(0x12345678) == 0x78563412, "Wrong conversion");
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static_assert(betoh<uint64_t>(0x123456789ABCDEF0) == 0xF0DEBC9A78563412, "Wrong conversion");
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#endif
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CHECK(betoh<uint8_t>(0x12) == 0x12);
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CHECK(betoh<uint16_t>(0x1234) == be16toh(0x1234));
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CHECK(betoh<uint32_t>(0x12345678) == be32toh(0x12345678));
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CHECK(betoh<uint64_t>(0x123456789ABCDEF0) == be64toh(0x123456789ABCDEF0));
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CHECK(betoh<int8_t>(0xFE) == static_cast<int8_t>(0xFE));
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CHECK(betoh<int16_t>(0xFEDC) == static_cast<int16_t>(be16toh(0xFEDC)));
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CHECK(betoh<int32_t>(0xFEDCBA09) == static_cast<int32_t>(be32toh(0xFEDCBA09)));
|
||||||
|
CHECK(betoh<int64_t>(0xFEDCBA0987654321) == static_cast<int64_t>(be64toh(0xFEDCBA0987654321)));
|
||||||
|
}
|
||||||
Loading…
Reference in a new issue