141 lines
3.6 KiB
C++
141 lines
3.6 KiB
C++
/*
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* Copyright (c) 2008-2012 Juli Mallett. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef COMMON_ENDIAN_H
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#define COMMON_ENDIAN_H
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#if !defined(BYTE_ORDER) && !defined(LITTLE_ENDIAN) && !defined(BIG_ENDIAN)
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#define LITTLE_ENDIAN 1234
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#define BIG_ENDIAN 4321
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#if defined(_LITTLE_ENDIAN)
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#define BYTE_ORDER LITTLE_ENDIAN
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#elif defined(_BIG_ENDIAN)
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#define BYTE_ORDER BIG_ENDIAN
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#else
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#error "Can't determine host byte order."
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#endif
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#endif
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#ifndef BYTE_ORDER
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#error "BYTE_ORDER must be defined."
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#else
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#if BYTE_ORDER == LITTLE_ENDIAN
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#elif BYTE_ORDER == BIG_ENDIAN
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#else
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#error "Unexpected BYTE_ORDER value."
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#endif
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#endif
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struct Endian {
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static uint16_t swap(const uint16_t& in)
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{
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return (((in & 0xff00u) >> 0x08) | ((in & 0x00ffu) << 0x08));
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}
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static uint32_t swap(const uint32_t& in)
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{
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return (((in & 0xff000000u) >> 0x18) |
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((in & 0x00ff0000u) >> 0x08) |
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((in & 0x0000ff00u) << 0x08) |
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((in & 0x000000ffu) << 0x18));
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}
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static uint64_t swap(const uint64_t& in)
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{
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return (((in & 0xff00000000000000ull) >> 0x38) |
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((in & 0x00ff000000000000ull) >> 0x28) |
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((in & 0x0000ff0000000000ull) >> 0x18) |
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((in & 0x000000ff00000000ull) >> 0x08) |
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((in & 0x00000000ff000000ull) << 0x08) |
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((in & 0x0000000000ff0000ull) << 0x18) |
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((in & 0x000000000000ff00ull) << 0x28) |
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((in & 0x00000000000000ffull) << 0x38));
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}
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};
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struct SwapEndian {
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template<typename T>
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static T encode(const T& in)
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{
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return (Endian::swap(in));
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}
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template<typename T>
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static T decode(const T& in)
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{
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return (Endian::swap(in));
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}
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template<class C, typename T>
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static void append(C *out, const T& in)
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{
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T swapped = encode(in);
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out->append(&swapped);
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}
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template<class C, typename T>
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static void extract(T *out, const C *in)
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{
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T wire;
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in->extract(&wire);
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*out = decode(wire);
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}
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};
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struct HostEndian {
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template<typename T>
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static T encode(const T& in)
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{
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return (in);
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}
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template<typename T>
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static T decode(const T& in)
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{
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return (in);
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}
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template<class C, typename T>
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static void append(C *out, const T& in)
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{
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out->append(&in);
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}
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template<class C, typename T>
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static void extract(T *out, const C *in)
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{
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in->extract(out);
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}
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};
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#if BYTE_ORDER == LITTLE_ENDIAN
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typedef HostEndian LittleEndian;
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typedef SwapEndian BigEndian;
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#elif BYTE_ORDER == BIG_ENDIAN
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typedef SwapEndian LittleEndian;
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typedef HostEndian BigEndian;
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#endif
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#endif /* !COMMON_ENDIAN_H */
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