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