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      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 #ifndef ANDROID_BASE_ENDIAN_H
     18 #define ANDROID_BASE_ENDIAN_H
     19 
     20 /* A cross-platform equivalent of bionic's <sys/endian.h>. */
     21 
     22 #if defined(__BIONIC__)
     23 
     24 #include <sys/endian.h>
     25 
     26 #elif defined(__GLIBC__)
     27 
     28 /* glibc's <endian.h> is like bionic's <sys/endian.h>. */
     29 #include <endian.h>
     30 
     31 /* glibc keeps htons and htonl in <netinet/in.h>. */
     32 #include <netinet/in.h>
     33 
     34 /* glibc doesn't have the 64-bit variants. */
     35 #define htonq(x) htobe64(x)
     36 #define ntohq(x) be64toh(x)
     37 
     38 /* glibc has different names to BSD for these. */
     39 #define betoh16(x) be16toh(x)
     40 #define betoh32(x) be32toh(x)
     41 #define betoh64(x) be64toh(x)
     42 
     43 #else
     44 
     45 /* Mac OS and Windows have nothing. */
     46 
     47 #define __LITTLE_ENDIAN 1234
     48 #define LITTLE_ENDIAN __LITTLE_ENDIAN
     49 
     50 #define __BIG_ENDIAN 4321
     51 #define BIG_ENDIAN __BIG_ENDIAN
     52 
     53 #define __BYTE_ORDER __LITTLE_ENDIAN
     54 #define BYTE_ORDER __BYTE_ORDER
     55 
     56 #define htons(x) __builtin_bswap16(x)
     57 #define htonl(x) __builtin_bswap32(x)
     58 #define htonq(x) __builtin_bswap64(x)
     59 
     60 #define ntohs(x) __builtin_bswap16(x)
     61 #define ntohl(x) __builtin_bswap32(x)
     62 #define ntohq(x) __builtin_bswap64(x)
     63 
     64 #define htobe16(x) __builtin_bswap16(x)
     65 #define htobe32(x) __builtin_bswap32(x)
     66 #define htobe64(x) __builtin_bswap64(x)
     67 
     68 #define betoh16(x) __builtin_bswap16(x)
     69 #define betoh32(x) __builtin_bswap32(x)
     70 #define betoh64(x) __builtin_bswap64(x)
     71 
     72 #define htole16(x) (x)
     73 #define htole32(x) (x)
     74 #define htole64(x) (x)
     75 
     76 #define letoh16(x) (x)
     77 #define letoh32(x) (x)
     78 #define letoh64(x) (x)
     79 
     80 #define be16toh(x) __builtin_bswap16(x)
     81 #define be32toh(x) __builtin_bswap32(x)
     82 #define be64toh(x) __builtin_bswap64(x)
     83 
     84 #define le16toh(x) (x)
     85 #define le32toh(x) (x)
     86 #define le64toh(x) (x)
     87 
     88 #endif
     89 
     90 #endif  // ANDROID_BASE_ENDIAN_H
     91