/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#ifndef INC_COMMON_BYTEORDER_H_
#define INC_COMMON_BYTEORDER_H_

/* Detect endianness if using TI compiler */
#ifndef __BYTE_ORDER__
    #define __ORDER_LITTLE_ENDIAN__ 1234
    #define __ORDER_BIG_ENDIAN__ 4321
    #ifdef __little_endian__
        #define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
    #else
        #ifdef __big_endian__
            #define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
        #else
            #error Unable to detect byte order!
        #endif
    #endif
#endif

#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
    /* Little endian host functions here */
    #define htobe16(a) ( (((a)>>8)&0xff) + (((a)<<8)&0xff00) )
    #define betoh16(a) htobe16(a)

    #define htobe32(a) ((((a) & 0xff000000) >> 24) | (((a) & 0x00ff0000) >> 8) | \
                  (((a) & 0x0000ff00) << 8)  | (((a) & 0x000000ff) << 24) )
    #define betoh32(a) htobe32(a)

    #define htole16(a)  a;   // Host is a little endian.
    #define letoh16(a)  htole16(a)

#else
    /* Big endian host functions here */
    #define htole16(a) ( (((a)>>8)&0xff) + (((a)<<8)&0xff00) )
    #define letoh16(a) htobe16(a)

    #define htole32(a) ((((a) & 0xff000000) >> 24) | (((a) & 0x00ff0000) >> 8) | \
                  (((a) & 0x0000ff00) << 8)  | (((a) & 0x000000ff) << 24) )
    #define letoh32(a) htobe32(a)

    #define htobe16(a)  a;   // Host is a little endian.
    #define betoh16(a)  htole16(a)

#endif


#endif /* INC_COMMON_BYTEORDER_H_ */