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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SHCIRCULARBUFFER_H
#define SHCIRCULARBUFFER_H
#include <log/log.h>
#include <vector>
template <class T>
class SHCircularBuffer {
public:
SHCircularBuffer() : mReadIndex(0), mWriteIndex(0), mReadAvailable(0) {
}
explicit SHCircularBuffer(size_t maxSize) {
resize(maxSize);
}
void resize(size_t maxSize) {
mBuffer.resize(maxSize);
mReadIndex = 0;
mWriteIndex = 0;
mReadAvailable = 0;
}
inline void write(T value) {
if (availableToWrite()) {
mBuffer[mWriteIndex++] = value;
if (mWriteIndex >= getSize()) {
mWriteIndex = 0;
}
mReadAvailable++;
} else {
ALOGE("Error: SHCircularBuffer no space to write. allocated size %zu ", getSize());
}
}
inline T read() {
T value = T();
if (availableToRead()) {
value = mBuffer[mReadIndex++];
if (mReadIndex >= getSize()) {
mReadIndex = 0;
}
mReadAvailable--;
} else {
ALOGW("Warning: SHCircularBuffer no data available to read. Default value returned");
}
return value;
}
inline size_t availableToRead() const {
return mReadAvailable;
}
inline size_t availableToWrite() const {
return getSize() - mReadAvailable;
}
inline size_t getSize() const {
return mBuffer.size();
}
private:
std::vector<T> mBuffer;
size_t mReadIndex;
size_t mWriteIndex;
size_t mReadAvailable;
};
#endif //SHCIRCULARBUFFER_H
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