1 /* 2 * Copyright 2017 Haiku, Inc. All rights reserved. 3 * Distributed under the terms of the MIT License. 4 */ 5 #ifndef _BSD_ENDIAN_H_ 6 #define _BSD_ENDIAN_H_ 7 8 9 #include_next <endian.h> 10 #include <features.h> 11 #include <stdint.h> 12 13 14 #ifdef _DEFAULT_SOURCE 15 16 #include <config/HaikuConfig.h> 17 18 #if __GNUC__ < 4 19 #include <support/ByteOrder.h> 20 #include <support/SupportDefs.h> 21 #endif 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 /* 28 * General byte order swapping functions. 29 */ 30 #if __GNUC__ >= 4 31 #define bswap16(x) __builtin_bswap16(x) 32 #define bswap32(x) __builtin_bswap32(x) 33 #define bswap64(x) __builtin_bswap64(x) 34 #else 35 #define bswap16(x) __swap_int16(x) 36 #define bswap32(x) __swap_int32(x) 37 #define bswap64(x) __swap_int64(x) 38 #endif 39 40 /* 41 * Host to big endian, host to little endian, big endian to host, and little 42 * endian to host byte order functions as detailed in byteorder(9). 43 */ 44 #if BYTE_ORDER == LITTLE_ENDIAN 45 #define htobe16(x) bswap16((x)) 46 #define htobe32(x) bswap32((x)) 47 #define htobe64(x) bswap64((x)) 48 #define htole16(x) ((uint16_t)(x)) 49 #define htole32(x) ((uint32_t)(x)) 50 #define htole64(x) ((uint64_t)(x)) 51 52 #define be16toh(x) bswap16((x)) 53 #define be32toh(x) bswap32((x)) 54 #define be64toh(x) bswap64((x)) 55 #define le16toh(x) ((uint16_t)(x)) 56 #define le32toh(x) ((uint32_t)(x)) 57 #define le64toh(x) ((uint64_t)(x)) 58 #else /* BYTE_ORDER != LITTLE_ENDIAN */ 59 #define htobe16(x) ((uint16_t)(x)) 60 #define htobe32(x) ((uint32_t)(x)) 61 #define htobe64(x) ((uint64_t)(x)) 62 #define htole16(x) bswap16((x)) 63 #define htole32(x) bswap32((x)) 64 #define htole64(x) bswap64((x)) 65 66 #define be16toh(x) ((uint16_t)(x)) 67 #define be32toh(x) ((uint32_t)(x)) 68 #define be64toh(x) ((uint64_t)(x)) 69 #define le16toh(x) bswap16((x)) 70 #define le32toh(x) bswap32((x)) 71 #define le64toh(x) bswap64((x)) 72 #endif /* BYTE_ORDER == LITTLE_ENDIAN */ 73 74 /* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ 75 76 static __inline uint32_t 77 be32dec(const void *pp) 78 { 79 uint8_t const *p = (uint8_t const *)pp; 80 81 return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); 82 } 83 84 static __inline uint64_t 85 be64dec(const void *pp) 86 { 87 uint8_t const *p = (uint8_t const *)pp; 88 89 return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); 90 } 91 92 static __inline void 93 be32enc(void *pp, uint32_t u) 94 { 95 uint8_t *p = (uint8_t *)pp; 96 97 p[0] = (u >> 24) & 0xff; 98 p[1] = (u >> 16) & 0xff; 99 p[2] = (u >> 8) & 0xff; 100 p[3] = u & 0xff; 101 } 102 103 static __inline void 104 be64enc(void *pp, uint64_t u) 105 { 106 uint8_t *p = (uint8_t *)pp; 107 108 be32enc(p, (uint32_t)(u >> 32)); 109 be32enc(p + 4, (uint32_t)(u & 0xffffffffU)); 110 } 111 112 #ifdef __cplusplus 113 } 114 #endif 115 116 117 #endif 118 119 120 #endif /* _BSD_ENDIAN_H_ */ 121