1/*
2 * Copyright (C) 2015 The Android Open Source Project
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
17#ifndef BASE_MEMORY_H
18#define BASE_MEMORY_H
19
20namespace android {
21namespace base {
22
23// Use packed structures for access to unaligned data on targets with alignment
24// restrictions.  The compiler will generate appropriate code to access these
25// structures without generating alignment exceptions.
26template <typename T>
27static inline T get_unaligned(const T* address) {
28  struct unaligned {
29    T v;
30  } __attribute__((packed));
31  const unaligned* p = reinterpret_cast<const unaligned*>(address);
32  return p->v;
33}
34
35template <typename T>
36static inline void put_unaligned(T* address, T v) {
37  struct unaligned {
38    T v;
39  } __attribute__((packed));
40  unaligned* p = reinterpret_cast<unaligned*>(address);
41  p->v = v;
42}
43
44} // namespace base
45} // namespace android
46
47#endif // BASE_MEMORY_H
48