106 lines
3.2 KiB
C++
106 lines
3.2 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* 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 libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010 Danny Robson <danny@nerdcruft.net>
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*/
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#include "endian.hpp"
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#include <cstdio>
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#include <type_traits>
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using std::is_fundamental;
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using std::is_unsigned;
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#ifdef WORDS_BIGENDIAN
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/* Big endian doesn't need swapping */
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template <typename T>
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T hton (T val) {
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static_assert (is_fundamental <T>(), "hton implementation assumes fundamental types");
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static_assert (is_unsigned <T>(), "hton implementation does not handle signed");
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return val;
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}
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template <typename T>
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T ntoh (T val) {
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static_assert (is_fundamental <T>(), "ntoh implementation assumes fundamental types");
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static_assert (is_unsigned <T>(), "ntoh implementation does not handle signed");
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return val;
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}
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template <> uint8_t hton ( uint8_t);
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template <> uint16_t hton (uint16_t);
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template <> uint32_t hton (uint32_t);
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template <> uint64_t hton (uint64_t);
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template <> uint8_t ntoh ( uint8_t);
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template <> uint16_t ntoh (uint16_t);
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template <> uint32_t ntoh (uint32_t);
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template <> uint64_t ntoh (uint64_t);
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#else
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static void
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byte_swap (uint8_t *restrict dst, uint8_t *restrict src, size_t len) {
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for (unsigned int i = 0; i < len; ++i)
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dst[len - i - 1] = src[i];
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}
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template <typename T>
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T
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hton (T i) {
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// Unsure if this will really be sensible for non-intrinsic types, or types larger than 8 bytes.
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static_assert (is_fundamental <T>::value, "hton implementation assumes fundamental types");
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static_assert (is_unsigned <T>::value, "hton implementation does not handle signed");
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T swapped;
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byte_swap (reinterpret_cast <uint8_t*>(&swapped),
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reinterpret_cast <uint8_t*>(&i),
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sizeof (T));
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return swapped;
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}
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template <typename T>
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T
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ntoh (T i) {
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// Unsure if this will really be sensible for non-intrinsic types, or types larger than 8 bytes.
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static_assert (is_fundamental <T>::value, "ntoh implementation assumes fundamental types");
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static_assert (is_unsigned <T>::value, "ntoh implementation does not handle signed");
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T swapped;
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byte_swap (reinterpret_cast <uint8_t*>(&swapped),
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reinterpret_cast <uint8_t*>(&i),
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sizeof (T));
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return swapped;
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}
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template <> uint8_t hton (uint8_t i) { return i; }
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template <> uint8_t ntoh (uint8_t i) { return i; }
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template uint16_t ntoh<uint16_t> (uint16_t);
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template uint32_t ntoh<uint32_t> (uint32_t);
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template uint64_t ntoh<uint64_t> (uint64_t);
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template uint16_t hton<uint16_t> (uint16_t);
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template uint32_t hton<uint32_t> (uint32_t);
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template uint64_t hton<uint64_t> (uint64_t);
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#endif
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