1 /*############################################################################
2 # Copyright 2017 Intel Corporation
3 #
4 # Licensed under the Apache License, Version 2.0 (the "License");
5 # you may not use this file except in compliance with the License.
6 # You may obtain a copy of the License at
7 #
8 #     http://www.apache.org/licenses/LICENSE-2.0
9 #
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS,
12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 # See the License for the specific language governing permissions and
14 # limitations under the License.
15 ############################################################################*/
16 /// Convert values between host and big-/little-endian byte order.
17 /*! \file */
18 
19 #ifndef EPID_MEMBER_TINY_STDLIB_ENDIAN_H_
20 #define EPID_MEMBER_TINY_STDLIB_ENDIAN_H_
21 
22 #include <stdint.h>
23 
24 /// Transform big endian uint32_t to host uint32_t
25 #define be32toh(big_endian_32bits)                                  \
26   ((uint32_t)(((((unsigned char*)&(big_endian_32bits))[0]) << 24) + \
27               ((((unsigned char*)&(big_endian_32bits))[1]) << 16) + \
28               ((((unsigned char*)&(big_endian_32bits))[2]) << 8) +  \
29               (((unsigned char*)&(big_endian_32bits))[3])))
30 
31 /// Transform host uint32_t to big endian uint32_t
32 #define htobe32(host_32bits)                                 \
33   (uint32_t)(((((uint32_t)(host_32bits)) & 0xFF) << 24) |    \
34              ((((uint32_t)(host_32bits)) & 0xFF00) << 8) |   \
35              ((((uint32_t)(host_32bits)) & 0xFF0000) >> 8) | \
36              ((((uint32_t)(host_32bits)) & 0xFF000000) >> 24))
37 
38 #endif  // EPID_MEMBER_TINY_STDLIB_ENDIAN_H_
39