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/dynamic_vector_base.h"
18
19 #include <cstdint>
20 #include <cstring>
21
22 #include "chre/util/container_support.h"
23
24 namespace chre {
25
DynamicVectorBase(DynamicVectorBase && other)26 DynamicVectorBase::DynamicVectorBase(DynamicVectorBase &&other)
27 : mData(other.mData), mSize(other.mSize), mCapacity(other.mCapacity) {
28 other.mData = nullptr;
29 other.mSize = 0;
30 other.mCapacity = 0;
31 }
32
doReserve(size_t newCapacity,size_t elementSize)33 bool DynamicVectorBase::doReserve(size_t newCapacity, size_t elementSize) {
34 bool success = (newCapacity <= mCapacity);
35 if (!success) {
36 void *newData = memoryAlloc(newCapacity * elementSize);
37 if (newData != nullptr) {
38 memcpy(newData, mData, mSize * elementSize);
39 memoryFree(mData);
40 mData = newData;
41 mCapacity = newCapacity;
42 success = true;
43 }
44 }
45
46 return success;
47 }
48
doPrepareForPush(size_t elementSize)49 bool DynamicVectorBase::doPrepareForPush(size_t elementSize) {
50 return doReserve(getNextGrowthCapacity(), elementSize);
51 }
52
getNextGrowthCapacity() const53 size_t DynamicVectorBase::getNextGrowthCapacity() const {
54 size_t newCapacity;
55 if (mCapacity == 0) {
56 newCapacity = 1;
57 } else if (mSize == mCapacity) {
58 newCapacity = mCapacity * 2;
59 } else {
60 newCapacity = mCapacity;
61 }
62
63 return newCapacity;
64 }
65
doErase(size_t index,size_t elementSize)66 void DynamicVectorBase::doErase(size_t index, size_t elementSize) {
67 mSize--;
68 size_t moveAmount = (mSize - index) * elementSize;
69 memmove(static_cast<uint8_t *>(mData) + (index * elementSize),
70 static_cast<uint8_t *>(mData) + ((index + 1) * elementSize),
71 moveAmount);
72 }
73
doPushBack(const void * element,size_t elementSize)74 bool DynamicVectorBase::doPushBack(const void *element, size_t elementSize) {
75 bool spaceAvailable = doPrepareForPush(elementSize);
76 if (spaceAvailable) {
77 memcpy(static_cast<uint8_t *>(mData) + (mSize * elementSize), element,
78 elementSize);
79 mSize++;
80 }
81
82 return spaceAvailable;
83 }
84
85 } // namespace chre
86
