1 /*
2 * Copyright (c) 2020, The OpenThread Authors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the copyright holder nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /**
30 * @file
31 * This file includes macros for validating runtime conditions.
32 */
33
34 #ifndef PLATFORM_UTILS_ENCODING_H
35 #define PLATFORM_UTILS_ENCODING_H
36
37 #include <stdint.h>
38
39 /**
40 * Converts a 64-bit unsigned integer stored as a little-endian byte
41 * array to uint64_t.
42 *
43 * Allows for the array to be byte-aligned, so that loading the
44 * uint64_t value via this function avoids a processor exception due
45 * to unaligned access.
46 *
47 * @param[in] aSource The byte array.
48 *
49 * @returns The 64-bit value as a uint64_t.
50 *
51 */
otEncodingReadUint64Le(const uint8_t * aSource)52 static inline uint64_t otEncodingReadUint64Le(const uint8_t *aSource)
53 {
54 uint64_t value = 0;
55
56 value |= (uint64_t)aSource[0];
57 value |= ((uint64_t)aSource[1]) << 8;
58 value |= ((uint64_t)aSource[2]) << 16;
59 value |= ((uint64_t)aSource[3]) << 24;
60 value |= ((uint64_t)aSource[4]) << 32;
61 value |= ((uint64_t)aSource[5]) << 40;
62 value |= ((uint64_t)aSource[6]) << 48;
63 value |= ((uint64_t)aSource[7]) << 56;
64
65 return value;
66 }
67
68 #endif // PLATFORM_UTILS_ENCODING_H
69