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Diffstat (limited to 'libtransport/src/hicn/transport/utils/endianess.h')
| -rw-r--r-- | libtransport/src/hicn/transport/utils/endianess.h | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/libtransport/src/hicn/transport/utils/endianess.h b/libtransport/src/hicn/transport/utils/endianess.h deleted file mode 100644 index d86e764ab..000000000 --- a/libtransport/src/hicn/transport/utils/endianess.h +++ /dev/null @@ -1,141 +0,0 @@ -/* - * Copyright (c) 2017-2019 Cisco and/or its affiliates. - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at: - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#pragma once - -#include <hicn/transport/portability/portability.h> - -#ifndef _WIN32 -#include <arpa/inet.h> -#else -#include <hicn/transport/portability/win_portability.h> -#endif - -#include <cstring> - -namespace utils { - -namespace { - -template <size_t Size> -struct uint_types_by_size; - -#define GENERATOR(sz, fn) \ - static TRANSPORT_ALWAYS_INLINE uint##sz##_t byteswap_gen(uint##sz##_t v) { \ - return fn(v); \ - } \ - template <> \ - struct uint_types_by_size<sz / 8> { \ - using type = uint##sz##_t; \ - }; - -GENERATOR(8, uint8_t) -#ifdef _MSC_VER -GENERATOR(64, _byteswap_uint64) -GENERATOR(32, _byteswap_ulong) -GENERATOR(16, _byteswap_ushort) -#else -GENERATOR(64, __builtin_bswap64) -GENERATOR(32, __builtin_bswap32) -GENERATOR(16, __builtin_bswap16) -#endif - -template <typename T> -struct EndianInt { - static_assert( - (std::is_integral<T>::value && !std::is_same<T, bool>::value) || - std::is_floating_point<T>::value, - "template type parameter must be non-bool integral or floating point"); - - static T swap(T x) { - // we implement this with memcpy because that is defined behavior in C++ - // we rely on compilers to optimize away the memcpy calls - constexpr auto s = sizeof(T); - using B = typename uint_types_by_size<s>::type; - B b; - std::memcpy(&b, &x, s); - b = byteswap_gen(b); - std::memcpy(&x, &b, s); - return x; - } - static T big(T x) { - return portability::little_endian_arch ? EndianInt::swap(x) : x; - } - static T little(T x) { - return portability::big_endian_arch ? EndianInt::swap(x) : x; - } -}; - -} // namespace - -// big* convert between native and big-endian representations -// little* convert between native and little-endian representations -// swap* convert between big-endian and little-endian representations -// -// ntohs, htons == big16 -// ntohl, htonl == big32 -#define GENERATOR1(fn, t, sz) \ - static t fn##sz(t x) { return fn<t>(x); } - -#define GENERATOR2(t, sz) \ - GENERATOR1(swap, t, sz) \ - GENERATOR1(big, t, sz) \ - GENERATOR1(little, t, sz) - -#define GENERATOR3(sz) \ - GENERATOR2(uint##sz##_t, sz) \ - GENERATOR2(int##sz##_t, sz) - -class Endian { - public: - enum class Order : uint8_t { LITTLE, BIG }; - - static constexpr Order order = - portability::little_endian_arch ? Order::LITTLE : Order::BIG; - - template <typename T> - static T swap(T x) { - return EndianInt<T>::swap(x); - } - - template <typename T> - static T big(T x) { - return EndianInt<T>::big(x); - } - - template <typename T> - static T little(T x) { - return EndianInt<T>::little(x); - } - -#if !defined(__ANDROID__) - GENERATOR3(64) - GENERATOR3(32) - GENERATOR3(16) - GENERATOR3(8) -#endif -}; - -template <typename T> -static TRANSPORT_ALWAYS_INLINE T ntoh(T x) { - return Endian::order == Endian::Order::LITTLE ? Endian::little(x) : x; -} - -template <typename T> -static TRANSPORT_ALWAYS_INLINE T hton(T x) { - return Endian::order == Endian::Order::LITTLE ? Endian::big(x) : x; -} - -} // namespace utils
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