1 /*
2  * Copyright (C) 2018 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 #include "chre/util/buffer_base.h"
18 
19 #include <cstring>
20 
21 #include "chre/util/container_support.h"
22 
23 namespace chre {
24 
25 BufferBase::~BufferBase() {
26   reset();
27 }
28 
29 void BufferBase::wrap(void *buffer, size_t size) {
30   // If buffer is nullptr, size must also be 0.
31   CHRE_ASSERT(buffer != nullptr || size == 0);
32   reset();
33   mBuffer = buffer;
34   mSize = size;
35 }
36 
37 bool BufferBase::copy_array(const void *buffer, size_t size,
38                             size_t elementSize) {
39   // If buffer is nullptr, size must also be 0.
40   CHRE_ASSERT(buffer != nullptr || size == 0);
41 
42   reset();
43   bool success = (size == 0);
44   if (!success) {
45     size_t copyBytes = size * elementSize;
46     mBuffer = memoryAlloc(copyBytes);
47     if (mBuffer != nullptr) {
48       mBufferRequiresFree = true;
49       memcpy(mBuffer, buffer, copyBytes);
50       mSize = size;
51       success = true;
52     }
53   }
54 
55   return success;
56 }
57 
58 void BufferBase::reset() {
59   if (mBufferRequiresFree) {
60     mBufferRequiresFree = false;
61     memoryFree(mBuffer);
62   }
63 
64   mBuffer = nullptr;
65   mSize = 0;
66 }
67 
68 }  // namespace chre
69