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