diff options
Diffstat (limited to 'portaudio/src/common/pa_endianness.h')
| -rw-r--r-- | portaudio/src/common/pa_endianness.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/portaudio/src/common/pa_endianness.h b/portaudio/src/common/pa_endianness.h new file mode 100644 index 0000000..e074836 --- /dev/null +++ b/portaudio/src/common/pa_endianness.h @@ -0,0 +1,145 @@ +#ifndef PA_ENDIANNESS_H +#define PA_ENDIANNESS_H +/* + * $Id$ + * Portable Audio I/O Library current platform endianness macros + * + * Based on the Open Source API proposed by Ross Bencina + * Copyright (c) 1999-2002 Phil Burk, Ross Bencina + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files + * (the "Software"), to deal in the Software without restriction, + * including without limitation the rights to use, copy, modify, merge, + * publish, distribute, sublicense, and/or sell copies of the Software, + * and to permit persons to whom the Software is furnished to do so, + * subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF + * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +/* + * The text above constitutes the entire PortAudio license; however, + * the PortAudio community also makes the following non-binding requests: + * + * Any person wishing to distribute modifications to the Software is + * requested to send the modifications to the original developer so that + * they can be incorporated into the canonical version. It is also + * requested that these non-binding requests be included along with the + * license above. + */ + +/** @file + @ingroup common_src + + @brief Configure endianness symbols for the target processor. + + Arrange for either the PA_LITTLE_ENDIAN or PA_BIG_ENDIAN preprocessor symbols + to be defined. The one that is defined reflects the endianness of the target + platform and may be used to implement conditional compilation of byte-order + dependent code. + + If either PA_LITTLE_ENDIAN or PA_BIG_ENDIAN is defined already, then no attempt + is made to override that setting. This may be useful if you have a better way + of determining the platform's endianness. The autoconf mechanism uses this for + example. + + A PA_VALIDATE_ENDIANNESS macro is provided to compare the compile time + and runtime endianness and raise an assertion if they don't match. +*/ + + +#ifdef __cplusplus +extern "C" +{ +#endif /* __cplusplus */ + +/* If this is an apple, we need to do detect endianness this way */ +#if defined(__APPLE__) + /* we need to do some endian detection that is sensitive to hardware arch */ + #if defined(__LITTLE_ENDIAN__) + #if !defined( PA_LITTLE_ENDIAN ) + #define PA_LITTLE_ENDIAN + #endif + #if defined( PA_BIG_ENDIAN ) + #undef PA_BIG_ENDIAN + #endif + #else + #if !defined( PA_BIG_ENDIAN ) + #define PA_BIG_ENDIAN + #endif + #if defined( PA_LITTLE_ENDIAN ) + #undef PA_LITTLE_ENDIAN + #endif + #endif +#else + /* this is not an apple, so first check the existing defines, and, failing that, + detect well-known architectures. */ + + #if defined(PA_LITTLE_ENDIAN) || defined(PA_BIG_ENDIAN) + /* endianness define has been set externally, such as by autoconf */ + + #if defined(PA_LITTLE_ENDIAN) && defined(PA_BIG_ENDIAN) + #error both PA_LITTLE_ENDIAN and PA_BIG_ENDIAN have been defined externally to pa_endianness.h - only one endianness at a time please + #endif + + #else + /* endianness define has not been set externally */ + + /* set PA_LITTLE_ENDIAN or PA_BIG_ENDIAN by testing well known platform specific defines */ + + #if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__) || defined(LITTLE_ENDIAN) || defined(__i386) || defined(_M_IX86) || defined(__x86_64__) + #define PA_LITTLE_ENDIAN /* win32, assume intel byte order */ + #else + #define PA_BIG_ENDIAN + #endif + #endif + + #if !defined(PA_LITTLE_ENDIAN) && !defined(PA_BIG_ENDIAN) + /* + If the following error is raised, you either need to modify the code above + to automatically determine the endianness from other symbols defined on your + platform, or define either PA_LITTLE_ENDIAN or PA_BIG_ENDIAN externally. + */ + #error pa_endianness.h was unable to automatically determine the endianness of the target platform + #endif + +#endif + + +/* PA_VALIDATE_ENDIANNESS compares the compile time and runtime endianness, + and raises an assertion if they don't match. <assert.h> must be included in + the context in which this macro is used. +*/ +#if defined(NDEBUG) + #define PA_VALIDATE_ENDIANNESS +#else + #if defined(PA_LITTLE_ENDIAN) + #define PA_VALIDATE_ENDIANNESS \ + { \ + const long nativeOne = 1; \ + assert( "PortAudio: compile time and runtime endianness don't match" && (((char *)&nativeOne)[0]) == 1 ); \ + } + #elif defined(PA_BIG_ENDIAN) + #define PA_VALIDATE_ENDIANNESS \ + { \ + const long nativeOne = 1; \ + assert( "PortAudio: compile time and runtime endianness don't match" && (((char *)&nativeOne)[0]) == 0 ); \ + } + #endif +#endif + + +#ifdef __cplusplus +} +#endif /* __cplusplus */ +#endif /* PA_ENDIANNESS_H */ |