libs/os/include/os/endian.h

/**
 * Copyright (c) 2015 Runtime Inc.
 *
 * 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 H_ENDIAN_
#define H_ENDIAN_

#include <inttypes.h>

#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__

#ifndef ntohll
#define ntohll(x)  ((uint64_t)(x))
#endif

#ifndef htonll
#define htonll(x)  ((uint64_t)(x))
#endif

#ifndef ntohl
#define ntohl(x)   ((uint32_t)(x))
#endif

#ifndef htonl
#define htonl(x)   ((uint32_t)(x))
#endif

#ifndef ntohs
#define ntohs(x)   ((uint16_t)(x))
#endif

#ifndef htons
#define htons(x)   ((uint16_t)(x))
#endif

#else

#ifndef ntohll
#define ntohll(x)   ((uint64_t)                     \
     ((((x) & 0xff00000000000000ull) >> 56) |       \
      (((x) & 0x00ff000000000000ull) >> 40) |       \
      (((x) & 0x0000ff0000000000ull) >> 24) |       \
      (((x) & 0x000000ff00000000ull) >>  8) |       \
      (((x) & 0x00000000ff000000ull) <<  8) |       \
      (((x) & 0x0000000000ff0000ull) << 24) |       \
      (((x) & 0x000000000000ff00ull) << 40) |       \
      (((x) & 0x00000000000000ffull) << 56)))
#endif

#ifndef htonll
#define htonll      ntohll
#endif

#ifndef ntohl
#define ntohl(x)    ((uint32_t)                     \
    ((((x) & 0xff000000) >> 24) |                   \
     (((x) & 0x00ff0000) >>  8) |                   \
     (((x) & 0x0000ff00) <<  8) |                   \
     (((x) & 0x000000ff) << 24)))
#endif

#ifndef htonl
#define htonl       ntohl
#endif

#ifndef htons
#define htons(x)   ((uint16_t)                      \
    ((((x) & 0xff00) >> 8) |                        \
     (((x) & 0x00ff) << 8)))
#endif

#ifndef ntohs
#define ntohs       htons
#endif

#endif
#endif