146 lines
5.4 KiB
C
146 lines
5.4 KiB
C
#ifndef PA_ENDIANNESS_H
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#define PA_ENDIANNESS_H
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/*
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* $Id: pa_endianness.h 1324 2008-01-27 02:03:30Z bjornroche $
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* Portable Audio I/O Library current platform endianness macros
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*
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* Based on the Open Source API proposed by Ross Bencina
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* Copyright (c) 1999-2002 Phil Burk, Ross Bencina
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* The text above constitutes the entire PortAudio license; however,
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* the PortAudio community also makes the following non-binding requests:
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*
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version. It is also
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* requested that these non-binding requests be included along with the
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* license above.
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*/
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/** @file
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@ingroup common_src
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@brief Configure endianness symbols for the target processor.
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Arrange for either the PA_LITTLE_ENDIAN or PA_BIG_ENDIAN preprocessor symbols
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to be defined. The one that is defined reflects the endianness of the target
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platform and may be used to implement conditional compilation of byte-order
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dependent code.
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If either PA_LITTLE_ENDIAN or PA_BIG_ENDIAN is defined already, then no attempt
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is made to override that setting. This may be useful if you have a better way
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of determining the platform's endianness. The autoconf mechanism uses this for
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example.
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A PA_VALIDATE_ENDIANNESS macro is provided to compare the compile time
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and runtime endiannes and raise an assertion if they don't match.
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*/
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#ifdef __cplusplus
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extern "C"
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{
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#endif /* __cplusplus */
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/* If this is an apple, we need to do detect endianness this way */
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#if defined(__APPLE__)
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/* we need to do some endian detection that is sensitive to harware arch */
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#if defined(__LITTLE_ENDIAN__)
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#if !defined( PA_LITTLE_ENDIAN )
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#define PA_LITTLE_ENDIAN
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#endif
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#if defined( PA_BIG_ENDIAN )
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#undef PA_BIG_ENDIAN
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#endif
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#else
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#if !defined( PA_BIG_ENDIAN )
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#define PA_BIG_ENDIAN
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#endif
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#if defined( PA_LITTLE_ENDIAN )
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#undef PA_LITTLE_ENDIAN
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#endif
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#endif
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#else
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/* this is not an apple, so first check the existing defines, and, failing that,
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detect well-known architechtures. */
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#if defined(PA_LITTLE_ENDIAN) || defined(PA_BIG_ENDIAN)
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/* endianness define has been set externally, such as by autoconf */
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#if defined(PA_LITTLE_ENDIAN) && defined(PA_BIG_ENDIAN)
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#error both PA_LITTLE_ENDIAN and PA_BIG_ENDIAN have been defined externally to pa_endianness.h - only one endianness at a time please
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#endif
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#else
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/* endianness define has not been set externally */
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/* set PA_LITTLE_ENDIAN or PA_BIG_ENDIAN by testing well known platform specific defines */
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#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__) || defined(LITTLE_ENDIAN) || defined(__i386) || defined(_M_IX86) || defined(__x86_64__)
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#define PA_LITTLE_ENDIAN /* win32, assume intel byte order */
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#else
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#define PA_BIG_ENDIAN
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#endif
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#endif
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#if !defined(PA_LITTLE_ENDIAN) && !defined(PA_BIG_ENDIAN)
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/*
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If the following error is raised, you either need to modify the code above
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to automatically determine the endianness from other symbols defined on your
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platform, or define either PA_LITTLE_ENDIAN or PA_BIG_ENDIAN externally.
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*/
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#error pa_endianness.h was unable to automatically determine the endianness of the target platform
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#endif
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#endif
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/* PA_VALIDATE_ENDIANNESS compares the compile time and runtime endianness,
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and raises an assertion if they don't match. <assert.h> must be included in
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the context in which this macro is used.
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*/
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#if defined(NDEBUG)
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#define PA_VALIDATE_ENDIANNESS
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#else
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#if defined(PA_LITTLE_ENDIAN)
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#define PA_VALIDATE_ENDIANNESS \
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{ \
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const long nativeOne = 1; \
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assert( "PortAudio: compile time and runtime endianness don't match" && (((char *)&nativeOne)[0]) == 1 ); \
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}
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#elif defined(PA_BIG_ENDIAN)
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#define PA_VALIDATE_ENDIANNESS \
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{ \
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const long nativeOne = 1; \
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assert( "PortAudio: compile time and runtime endianness don't match" && (((char *)&nativeOne)[0]) == 0 ); \
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}
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#endif
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#endif
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* PA_ENDIANNESS_H */
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