Mbed OS Reference | whd_endian.h Source File

 /*
  * Copyright 2020 Cypress Semiconductor Corporation
  * SPDX-License-Identifier: Apache-2.0
  * 
  * 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.
  */
 /*
  * Byte order utilities
  *
  * This file by default provides proper behavior on little-endian architectures.
  * On big-endian architectures, IL_BIGENDIAN should be defined.
  */
 
 #ifndef INCLUDED_WHD_ENDIAN_H
 #define INCLUDED_WHD_ENDIAN_H
 
 #ifdef __cplusplus
 extern "C"
 {
 #endif
 
 /* Reverse the bytes in a 16-bit value */
 #define SWAP16(val) \
     ( (uint16_t)( ( ( (uint16_t)(val) & (uint16_t)0x00ffU ) << 8 ) | \
                   ( ( (uint16_t)(val) & (uint16_t)0xff00U ) >> 8 ) ) )
 
 /* Reverse the bytes in a 32-bit value */
 #define SWAP32(val) \
     ( (uint32_t)( ( ( (uint32_t)(val) & (uint32_t)0x000000ffU ) << 24 ) | \
                   ( ( (uint32_t)(val) & (uint32_t)0x0000ff00U ) <<  8 ) | \
                   ( ( (uint32_t)(val) & (uint32_t)0x00ff0000U ) >>  8 ) | \
                   ( ( (uint32_t)(val) & (uint32_t)0xff000000U ) >> 24 ) ) )
 
 #ifdef IL_BIGENDIAN
 #define htod32(i) SWAP32(i)
 #define htod16(i) SWAP16(i)
 #define dtoh32(i) SWAP32(i)
 #define dtoh16(i) SWAP16(i)
 #define hton16(i) (i)
 #define hton32(i) (i)
 #define ntoh16(i) (i)
 #define ntoh32(i) (i)
 #else /* IL_BIGENDIAN */
 #define htod32(i) (i)
 #define htod16(i) (i)
 #define dtoh32(i) (i)
 #define dtoh16(i) (i)
 #define hton16(i) SWAP16(i)
 #define hton32(i) SWAP32(i)
 #define ntoh16(i) SWAP16(i)
 #define ntoh32(i) SWAP32(i)
 #endif /* IL_BIGENDIAN */
 
 #ifdef __cplusplus
 } /* extern "C" */
 #endif
 
 #endif /* INCLUDED_WHD_ENDIAN_H */
 
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