1/* 2 * Copyright (C) 2006 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// 18 19#ifndef _LIBS_UTILS_BYTE_ORDER_H 20#define _LIBS_UTILS_BYTE_ORDER_H 21 22#include <stdint.h> 23#include <sys/types.h> 24#ifdef HAVE_WINSOCK 25#include <winsock2.h> 26#else 27#include <netinet/in.h> 28#endif 29 30/* 31 * These macros are like the hton/ntoh byte swapping macros, 32 * except they allow you to swap to and from the "device" byte 33 * order. The device byte order is the endianness of the target 34 * device -- for the ARM CPUs we use today, this is little endian. 35 * 36 * Note that the byte swapping functions have not been optimized 37 * much; performance is currently not an issue for them since the 38 * intent is to allow us to avoid byte swapping on the device. 39 */ 40 41static inline uint32_t android_swap_long(uint32_t v) 42{ 43 return (v<<24) | ((v<<8)&0x00FF0000) | ((v>>8)&0x0000FF00) | (v>>24); 44} 45 46static inline uint16_t android_swap_short(uint16_t v) 47{ 48 return (v<<8) | (v>>8); 49} 50 51#define DEVICE_BYTE_ORDER LITTLE_ENDIAN 52 53#if BYTE_ORDER == DEVICE_BYTE_ORDER 54 55#define dtohl(x) (x) 56#define dtohs(x) (x) 57#define htodl(x) (x) 58#define htods(x) (x) 59 60#else 61 62#define dtohl(x) (android_swap_long(x)) 63#define dtohs(x) (android_swap_short(x)) 64#define htodl(x) (android_swap_long(x)) 65#define htods(x) (android_swap_short(x)) 66 67#endif 68 69#if BYTE_ORDER == LITTLE_ENDIAN 70#define fromlel(x) (x) 71#define fromles(x) (x) 72#define tolel(x) (x) 73#define toles(x) (x) 74#else 75#define fromlel(x) (android_swap_long(x)) 76#define fromles(x) (android_swap_short(x)) 77#define tolel(x) (android_swap_long(x)) 78#define toles(x) (android_swap_short(x)) 79#endif 80 81#endif // _LIBS_UTILS_BYTE_ORDER_H 82