1 /* 2 * Copyright 2007, Haiku, Inc. All rights reserved. 3 * Distributed under the terms of the MIT License. 4 */ 5 #ifndef _BYTE_ORDER_H 6 #define _BYTE_ORDER_H 7 8 9 #include <BeBuild.h> 10 #include <endian.h> 11 #include <SupportDefs.h> 12 #include <TypeConstants.h> 13 /* for convenience */ 14 15 16 /* swap directions */ 17 typedef enum { 18 B_SWAP_HOST_TO_LENDIAN, 19 B_SWAP_HOST_TO_BENDIAN, 20 B_SWAP_LENDIAN_TO_HOST, 21 B_SWAP_BENDIAN_TO_HOST, 22 B_SWAP_ALWAYS 23 } swap_action; 24 25 26 /* always swap macros */ 27 #define B_SWAP_DOUBLE(arg) __swap_double(arg) 28 #define B_SWAP_FLOAT(arg) __swap_float(arg) 29 #define B_SWAP_INT64(arg) __swap_int64(arg) 30 #define B_SWAP_INT32(arg) __swap_int32(arg) 31 #define B_SWAP_INT16(arg) __swap_int16(arg) 32 33 #if BYTE_ORDER == __LITTLE_ENDIAN 34 /* Host is little endian */ 35 36 #define B_HOST_IS_LENDIAN 1 37 #define B_HOST_IS_BENDIAN 0 38 39 /* Host native to little endian */ 40 #define B_HOST_TO_LENDIAN_DOUBLE(arg) (double)(arg) 41 #define B_HOST_TO_LENDIAN_FLOAT(arg) (float)(arg) 42 #define B_HOST_TO_LENDIAN_INT64(arg) (uint64)(arg) 43 #define B_HOST_TO_LENDIAN_INT32(arg) (uint32)(arg) 44 #define B_HOST_TO_LENDIAN_INT16(arg) (uint16)(arg) 45 46 /* Little endian to host native */ 47 #define B_LENDIAN_TO_HOST_DOUBLE(arg) (double)(arg) 48 #define B_LENDIAN_TO_HOST_FLOAT(arg) (float)(arg) 49 #define B_LENDIAN_TO_HOST_INT64(arg) (uint64)(arg) 50 #define B_LENDIAN_TO_HOST_INT32(arg) (uint32)(arg) 51 #define B_LENDIAN_TO_HOST_INT16(arg) (uint16)(arg) 52 53 /* Host native to big endian */ 54 #define B_HOST_TO_BENDIAN_DOUBLE(arg) __swap_double(arg) 55 #define B_HOST_TO_BENDIAN_FLOAT(arg) __swap_float(arg) 56 #define B_HOST_TO_BENDIAN_INT64(arg) __swap_int64(arg) 57 #define B_HOST_TO_BENDIAN_INT32(arg) __swap_int32(arg) 58 #define B_HOST_TO_BENDIAN_INT16(arg) __swap_int16(arg) 59 60 /* Big endian to host native */ 61 #define B_BENDIAN_TO_HOST_DOUBLE(arg) __swap_double(arg) 62 #define B_BENDIAN_TO_HOST_FLOAT(arg) __swap_float(arg) 63 #define B_BENDIAN_TO_HOST_INT64(arg) __swap_int64(arg) 64 #define B_BENDIAN_TO_HOST_INT32(arg) __swap_int32(arg) 65 #define B_BENDIAN_TO_HOST_INT16(arg) __swap_int16(arg) 66 67 #else /* BYTE_ORDER */ 68 /* Host is big endian */ 69 70 #define B_HOST_IS_LENDIAN 0 71 #define B_HOST_IS_BENDIAN 1 72 73 /* Host native to little endian */ 74 #define B_HOST_TO_LENDIAN_DOUBLE(arg) __swap_double(arg) 75 #define B_HOST_TO_LENDIAN_FLOAT(arg) __swap_float(arg) 76 #define B_HOST_TO_LENDIAN_INT64(arg) __swap_int64(arg) 77 #define B_HOST_TO_LENDIAN_INT32(arg) __swap_int32(arg) 78 #define B_HOST_TO_LENDIAN_INT16(arg) __swap_int16(arg) 79 80 /* Little endian to host native */ 81 #define B_LENDIAN_TO_HOST_DOUBLE(arg) __swap_double(arg) 82 #define B_LENDIAN_TO_HOST_FLOAT(arg) __swap_float(arg) 83 #define B_LENDIAN_TO_HOST_INT64(arg) __swap_int64(arg) 84 #define B_LENDIAN_TO_HOST_INT32(arg) __swap_int32(arg) 85 #define B_LENDIAN_TO_HOST_INT16(arg) __swap_int16(arg) 86 87 /* Host native to big endian */ 88 #define B_HOST_TO_BENDIAN_DOUBLE(arg) (double)(arg) 89 #define B_HOST_TO_BENDIAN_FLOAT(arg) (float)(arg) 90 #define B_HOST_TO_BENDIAN_INT64(arg) (uint64)(arg) 91 #define B_HOST_TO_BENDIAN_INT32(arg) (uint32)(arg) 92 #define B_HOST_TO_BENDIAN_INT16(arg) (uint16)(arg) 93 94 /* Big endian to host native */ 95 #define B_BENDIAN_TO_HOST_DOUBLE(arg) (double)(arg) 96 #define B_BENDIAN_TO_HOST_FLOAT(arg) (float)(arg) 97 #define B_BENDIAN_TO_HOST_INT64(arg) (uint64)(arg) 98 #define B_BENDIAN_TO_HOST_INT32(arg) (uint32)(arg) 99 #define B_BENDIAN_TO_HOST_INT16(arg) (uint16)(arg) 100 101 #endif /* BYTE_ORDER */ 102 103 104 #ifdef __cplusplus 105 extern "C" { 106 #endif /* __cplusplus */ 107 108 extern status_t swap_data(type_code type, void *data, size_t length, 109 swap_action action); 110 extern bool is_type_swapped(type_code type); 111 112 /* Private implementations */ 113 extern double __swap_double(double arg); 114 extern float __swap_float(float arg); 115 #if __GNUC__ >= 4 116 #define __swap_int64(arg) (uint64)__builtin_bswap64(arg) 117 #define __swap_int32(arg) (uint32)__builtin_bswap32(arg) 118 #define __swap_int16(arg) (uint16)__builtin_bswap16(arg) 119 #else 120 extern uint64 __swap_int64(uint64 arg); 121 extern uint32 __swap_int32(uint32 arg); 122 extern uint16 __swap_int16(uint16 arg); 123 #endif 124 125 #ifdef __cplusplus 126 } 127 #endif /* __cplusplus */ 128 129 #endif /* _BYTE_ORDER_H */ 130