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 ANDROID_BASE_MEMORY_H
18 #define ANDROID_BASE_MEMORY_H
19 
20 namespace android {
21 namespace 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.
26 template <typename T>
get_unaligned(const T * address)27 static 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 
35 template <typename T>
put_unaligned(T * address,T v)36 static 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  // ANDROID_BASE_MEMORY_H
48