00001 #ifndef PA_ENDIANNESS_H 00002 #define PA_ENDIANNESS_H 00003 /* 00004 * $Id: pa_endianness.h 1083 2006-08-23 07:30:49Z rossb $ 00005 * Portable Audio I/O Library current platform endianness macros 00006 * 00007 * Based on the Open Source API proposed by Ross Bencina 00008 * Copyright (c) 1999-2002 Phil Burk, Ross Bencina 00009 * 00010 * Permission is hereby granted, free of charge, to any person obtaining 00011 * a copy of this software and associated documentation files 00012 * (the "Software"), to deal in the Software without restriction, 00013 * including without limitation the rights to use, copy, modify, merge, 00014 * publish, distribute, sublicense, and/or sell copies of the Software, 00015 * and to permit persons to whom the Software is furnished to do so, 00016 * subject to the following conditions: 00017 * 00018 * The above copyright notice and this permission notice shall be 00019 * included in all copies or substantial portions of the Software. 00020 * 00021 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 00022 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 00023 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 00024 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR 00025 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF 00026 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 00027 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 00028 */ 00029 00030 /* 00031 * The text above constitutes the entire PortAudio license; however, 00032 * the PortAudio community also makes the following non-binding requests: 00033 * 00034 * Any person wishing to distribute modifications to the Software is 00035 * requested to send the modifications to the original developer so that 00036 * they can be incorporated into the canonical version. It is also 00037 * requested that these non-binding requests be included along with the 00038 * license above. 00039 */ 00040 00059 #ifdef __cplusplus 00060 extern "C" 00061 { 00062 #endif /* __cplusplus */ 00063 00064 /* If this is an apple, we need to do detect endianness this way */ 00065 #if defined(__APPLE__) 00066 /* we need to do some endian detection that is sensitive to harware arch */ 00067 #if defined(__LITTLE_ENDIAN__) 00068 #if !defined( PA_LITTLE_ENDIAN ) 00069 #define PA_LITTLE_ENDIAN 00070 #endif 00071 #if defined( PA_BIG_ENDIAN ) 00072 #undef PA_BIG_ENDIAN 00073 #endif 00074 #else 00075 #if !defined( PA_BIG_ENDIAN ) 00076 #define PA_BIG_ENDIAN 00077 #endif 00078 #if defined( PA_LITTLE_ENDIAN ) 00079 #undef PA_LITTLE_ENDIAN 00080 #endif 00081 #endif 00082 #else 00083 /* this is not an apple, so first check the existing defines, and, failing that, 00084 detect well-known architechtures. */ 00085 00086 #if defined(PA_LITTLE_ENDIAN) || defined(PA_BIG_ENDIAN) 00087 /* endianness define has been set externally, such as by autoconf */ 00088 00089 #if defined(PA_LITTLE_ENDIAN) && defined(PA_BIG_ENDIAN) 00090 #error both PA_LITTLE_ENDIAN and PA_BIG_ENDIAN have been defined externally to pa_endianness.h - only one endianness at a time please 00091 #endif 00092 00093 #endif 00094 /* endianness define has not been set externally */ 00095 00096 /* set PA_LITTLE_ENDIAN or PA_BIG_ENDIAN by testing well known platform specific defines */ 00097 00098 #if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__) || defined(LITTLE_ENDIAN) || defined(__i386) || defined(_M_IX86) 00099 #define PA_LITTLE_ENDIAN /* win32, assume intel byte order */ 00100 #else 00101 #define PA_BIG_ENDIAN 00102 #endif 00103 00104 #if !defined(PA_LITTLE_ENDIAN) && !defined(PA_BIG_ENDIAN) 00105 /* 00106 If the following error is raised, you either need to modify the code above 00107 to automatically determine the endianness from other symbols defined on your 00108 platform, or define either PA_LITTLE_ENDIAN or PA_BIG_ENDIAN externally. 00109 */ 00110 #error pa_endianness.h was unable to automatically determine the endianness of the target platform 00111 #endif 00112 00113 #endif 00114 00115 /* PA_VALIDATE_ENDIANNESS compares the compile time and runtime endianness, 00116 and raises an assertion if they don't match. <assert.h> must be included in 00117 the context in which this macro is used. 00118 */ 00119 #if defined(PA_LITTLE_ENDIAN) 00120 #define PA_VALIDATE_ENDIANNESS \ 00121 { \ 00122 const long nativeOne = 1; \ 00123 assert( "PortAudio: compile time and runtime endianness don't match" && (((char *)&nativeOne)[0]) == 1 ); \ 00124 } 00125 #elif defined(PA_BIG_ENDIAN) 00126 #define PA_VALIDATE_ENDIANNESS \ 00127 { \ 00128 const long nativeOne = 1; \ 00129 assert( "PortAudio: compile time and runtime endianness don't match" && (((char *)&nativeOne)[0]) == 0 ); \ 00130 } 00131 #endif 00132 00133 00134 #ifdef __cplusplus 00135 } 00136 #endif /* __cplusplus */ 00137 #endif /* PA_ENDIANNESS_H */