1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 /* A cross-platform equivalent of bionic's <sys/endian.h>. */ 20 21 /* For __BIONIC__ and __GLIBC__ */ 22 #include <sys/cdefs.h> 23 24 #if defined(__BIONIC__) 25 26 #include <sys/endian.h> 27 28 #elif defined(__GLIBC__) 29 30 /* glibc's <endian.h> is like bionic's <sys/endian.h>. */ 31 #include <endian.h> 32 33 /* glibc keeps htons and htonl in <netinet/in.h>. */ 34 #include <netinet/in.h> 35 36 /* glibc doesn't have the 64-bit variants. */ 37 #define htonq(x) htobe64(x) 38 #define ntohq(x) be64toh(x) 39 40 /* glibc has different names to BSD for these. */ 41 #define betoh16(x) be16toh(x) 42 #define betoh32(x) be32toh(x) 43 #define betoh64(x) be64toh(x) 44 #define letoh16(x) le16toh(x) 45 #define letoh32(x) le32toh(x) 46 #define letoh64(x) le64toh(x) 47 48 #else 49 50 #if defined(__APPLE__) 51 /* macOS has some of the basics. */ 52 #include <sys/_endian.h> 53 #else 54 /* Windows has some of the basics as well. */ 55 #include <sys/param.h> 56 #include <winsock2.h> 57 /* winsock2.h *must* be included before the following four macros. */ 58 #define htons(x) __builtin_bswap16(x) 59 #define htonl(x) __builtin_bswap32(x) 60 #define ntohs(x) __builtin_bswap16(x) 61 #define ntohl(x) __builtin_bswap32(x) 62 #endif 63 64 /* Neither macOS nor Windows have the rest. */ 65 66 #define __LITTLE_ENDIAN 1234 67 #define __BIG_ENDIAN 4321 68 #define __BYTE_ORDER __LITTLE_ENDIAN 69 70 #define htonq(x) __builtin_bswap64(x) 71 72 #define ntohq(x) __builtin_bswap64(x) 73 74 #define htobe16(x) __builtin_bswap16(x) 75 #define htobe32(x) __builtin_bswap32(x) 76 #define htobe64(x) __builtin_bswap64(x) 77 78 #define betoh16(x) __builtin_bswap16(x) 79 #define betoh32(x) __builtin_bswap32(x) 80 #define betoh64(x) __builtin_bswap64(x) 81 82 #define htole16(x) (x) 83 #define htole32(x) (x) 84 #define htole64(x) (x) 85 86 #define letoh16(x) (x) 87 #define letoh32(x) (x) 88 #define letoh64(x) (x) 89 90 #define be16toh(x) __builtin_bswap16(x) 91 #define be32toh(x) __builtin_bswap32(x) 92 #define be64toh(x) __builtin_bswap64(x) 93 94 #define le16toh(x) (x) 95 #define le32toh(x) (x) 96 #define le64toh(x) (x) 97 98 #endif 99