70 lines
2.6 KiB
C
70 lines
2.6 KiB
C
/****************************************************************************
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** Copyright (c) 2016, Fougue Ltd. <http://www.fougue.pro>
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** 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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**
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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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**
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** 2. Redistributions in binary form must reproduce the above
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** copyright notice, this list of conditions and the following
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** disclaimer in the documentation and/or other materials provided
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** with the distribution.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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****************************************************************************/
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#ifndef GMIO_INTERNAL_BYTE_SWAP_H
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#define GMIO_INTERNAL_BYTE_SWAP_H
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#include "../global.h"
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#ifdef GMIO_HAVE_MSVC_BUILTIN_BSWAP_FUNC
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# include <stdlib.h>
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#endif
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/*! Returns \p val with the order of bytes reversed, uses compiler builtin
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* functions if available */
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GMIO_INLINE uint16_t gmio_uint16_bswap(uint16_t val)
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{
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#ifdef GMIO_HAVE_GCC_BUILTIN_BSWAP16_FUNC
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return __builtin_bswap16(val);
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#elif defined(GMIO_HAVE_MSVC_BUILTIN_BSWAP_FUNC)
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return _byteswap_ushort(val);
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#else
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return ((val & 0x00FF) << 8) | ((val >> 8) & 0x00FF);
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#endif
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}
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/*! Returns \p val with the order of bytes reversed, uses compiler builtin
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* functions if available */
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GMIO_INLINE uint32_t gmio_uint32_bswap(uint32_t val)
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{
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#ifdef GMIO_HAVE_GCC_BUILTIN_BSWAP32_FUNC
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return __builtin_bswap32(val);
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#elif defined(GMIO_HAVE_MSVC_BUILTIN_BSWAP_FUNC)
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return _byteswap_ulong(val);
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#else
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return
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((val & 0x000000FF) << 24)
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| ((val & 0x0000FF00) << 8)
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| ((val >> 8) & 0x0000FF00)
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| ((val >> 24) & 0x000000FF);
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#endif
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}
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#endif /* GMIO_INTERNAL_BYTE_SWAP_H */
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