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      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>
     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>
     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