169 lines
5.5 KiB
C++
169 lines
5.5 KiB
C++
// ____ ______ __
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// / __ \ / ____// /
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// / /_/ // / / /
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// / ____// /___ / /___ PixInsight Class Library
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// /_/ \____//_____/ PCL 2.4.23
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// ----------------------------------------------------------------------------
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// pcl/EndianConversions.h - Released 2022-03-12T18:59:29Z
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// ----------------------------------------------------------------------------
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// This file is part of the PixInsight Class Library (PCL).
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// PCL is a multiplatform C++ framework for development of PixInsight modules.
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//
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// Copyright (c) 2003-2022 Pleiades Astrophoto S.L. All Rights Reserved.
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//
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// Redistribution and use in both source and binary forms, with or without
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// modification, is permitted provided that the following conditions are met:
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//
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// 1. All 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. All 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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// 3. Neither the names "PixInsight" and "Pleiades Astrophoto", nor the names
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// of their contributors, may be used to endorse or promote products derived
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// from this software without specific prior written permission. For written
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// permission, please contact info@pixinsight.com.
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//
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// 4. All products derived from this software, in any form whatsoever, must
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// reproduce the following acknowledgment in the end-user documentation
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// and/or other materials provided with the product:
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//
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// "This product is based on software from the PixInsight project, developed
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// by Pleiades Astrophoto and its contributors (https://pixinsight.com/)."
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//
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// Alternatively, if that is where third-party acknowledgments normally
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// appear, this acknowledgment must be reproduced in the product itself.
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//
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// THIS SOFTWARE IS PROVIDED BY PLEIADES ASTROPHOTO AND ITS CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL PLEIADES ASTROPHOTO OR ITS
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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// EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, BUSINESS
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// INTERRUPTION; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; AND LOSS OF USE,
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// DATA OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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// ----------------------------------------------------------------------------
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#ifndef __PCL_EndianConversions_h
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#define __PCL_EndianConversions_h
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/// \file pcl/EndianConversions.h
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#include <pcl/Defs.h>
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#include <pcl/Math.h>
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namespace pcl
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{
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// ----------------------------------------------------------------------------
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/*!
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* \defgroup endianness_conversion_and_detection Endianness Conversion and Detection Functions
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*/
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/*!
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* Converts a 16-bit unsigned integer from big endian to little endian byte
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* storage order.
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*
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* \ingroup endianness_conversion_and_detection
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*/
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inline uint16 BigToLittleEndian( uint16 x )
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{
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return (x << 8) | (x >> 8);
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}
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/*!
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* Converts a 32-bit unsigned integer from big endian to little endian byte
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* storage order.
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*
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* \ingroup endianness_conversion_and_detection
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*/
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inline uint32 BigToLittleEndian( uint32 x )
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{
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return (RotL( x, 8 ) & 0x00ff00ffu) | (RotR( x, 8 ) & 0xff00ff00u);
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}
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/*!
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* Converts a 64-bit unsigned integer from big endian to little endian byte
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* storage order.
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*
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* \ingroup endianness_conversion_and_detection
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*/
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inline uint64 BigToLittleEndian( uint64 x )
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{
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return (uint64( BigToLittleEndian( uint32( x ) ) ) << 32) | uint64( BigToLittleEndian( uint32( x >> 32 ) ) );
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}
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/*!
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* A convenience synonym function for little-to-big endian conversions, which
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* we define for the sake of code legibility. It is obviously equivalent to
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* BigToLittleEndian( x ).
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*
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* \ingroup endianness_conversion_and_detection
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*/
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template <typename T> inline T LittleToBigEndian( T x )
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{
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return BigToLittleEndian( x );
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}
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// ----------------------------------------------------------------------------
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union __pcl_endian_check__ { uint32 w; uint8 b[ sizeof( uint32 ) ]; };
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constexpr __pcl_endian_check__ __pcl_endian_check_sample__ = { 0xdeadbeef };
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#ifdef __clang__
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inline bool IsLittleEndianMachine()
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{
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return __pcl_endian_check_sample__.b[0] == 0xef;
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}
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inline bool IsBigEndianMachine()
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{
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return __pcl_endian_check_sample__.b[0] == 0xde;
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}
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#else
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// Clang fails here with "read of member 'b' of union with active member 'w' is
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// not allowed in a constant expression".
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/*!
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* Returns true iff the caller is running on a little-endian architecture.
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*
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* \ingroup endianness_conversion_and_detection
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*/
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constexpr bool IsLittleEndianMachine()
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{
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return __pcl_endian_check_sample__.b[0] == 0xef;
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}
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/*!
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* Returns true iff the caller is running on a big-endian architecture.
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*
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* \ingroup endianness_conversion_and_detection
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*/
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constexpr bool IsBigEndianMachine()
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{
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return __pcl_endian_check_sample__.b[0] == 0xde;
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}
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#endif // __clang__
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// ----------------------------------------------------------------------------
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} // pcl
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#endif // __PCL_EndianConversions_h
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// ----------------------------------------------------------------------------
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// EOF pcl/EndianConversions.h - Released 2022-03-12T18:59:29Z
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