text: /*
   * Copyright (C) 2006 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  //
  
  #ifndef _LIBS_UTILS_BYTE_ORDER_H
  #define _LIBS_UTILS_BYTE_ORDER_H
  
  #include <stdint.h>
  #include <sys/types.h>
  #if defined(_WIN32)
  #include <winsock2.h>
  #else
  #include <netinet/in.h>
  #endif
  
  /*
   * These macros are like the hton/ntoh byte swapping macros,
   * except they allow you to swap to and from the "device" byte
   * order.  The device byte order is the endianness of the target
   * device -- for the ARM CPUs we use today, this is little endian.
   *
   * Note that the byte swapping functions have not been optimized
   * much; performance is currently not an issue for them since the
   * intent is to allow us to avoid byte swapping on the device.
   */
  
  static inline uint32_t android_swap_long(uint32_t v)
  {
      return (v<<24) | ((v<<8)&0x00FF0000) | ((v>>8)&0x0000FF00) | (v>>24);
  }
  
  static inline uint16_t android_swap_short(uint16_t v)
  {
      return (v<<8) | (v>>8);
  }
  
  #define DEVICE_BYTE_ORDER LITTLE_ENDIAN
  
  #if BYTE_ORDER == DEVICE_BYTE_ORDER
  
  #define	dtohl(x)	(x)
  #define	dtohs(x)	(x)
  #define	htodl(x)	(x)
  #define	htods(x)	(x)
  
  #else
  
  #define	dtohl(x)	(android_swap_long(x))
  #define	dtohs(x)	(android_swap_short(x))
  #define	htodl(x)	(android_swap_long(x))
  #define	htods(x)	(android_swap_short(x))
  
  #endif
  
  #if BYTE_ORDER == LITTLE_ENDIAN
  #define fromlel(x) (x)
  #define fromles(x) (x)
  #define tolel(x) (x)
  #define toles(x) (x)
  #else
  #define fromlel(x) (android_swap_long(x))
  #define fromles(x) (android_swap_short(x))
  #define tolel(x) (android_swap_long(x))
  #define toles(x) (android_swap_short(x))
  #endif
  
  #endif // _LIBS_UTILS_BYTE_ORDER_H
  