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/*
* Copyright (C) 2013, 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 LATINIME_EXTENDABLE_BUFFER_H
#define LATINIME_EXTENDABLE_BUFFER_H
#include <cstddef>
#include <stdint.h>
#include <vector>
#include "defines.h"
namespace latinime {
// This is used as a buffer that can be extended for updatable dictionaries.
class ExtendableBuffer {
public:
ExtendableBuffer() : mBuffer(INITIAL_BUFFER_SIZE), mUsedSize(0) {}
AK_FORCE_INLINE uint8_t *getBuffer() {
return &mBuffer[0];
}
// Return if the buffer is successfully extended or not.
AK_FORCE_INLINE bool extendBuffer() {
if (mBuffer.size() + EXTEND_BUFFER_SIZE_STEP > MAX_BUFFER_SIZE) {
return false;
}
mBuffer.resize(mBuffer.size() + EXTEND_BUFFER_SIZE_STEP);
return true;
}
AK_FORCE_INLINE int getAllocatedSize() const {
return mBuffer.size();
}
AK_FORCE_INLINE int getUsedSize() const {
return mUsedSize;
}
AK_FORCE_INLINE void clear() {
mUsedSize = 0;
mBuffer.clear();
}
private:
DISALLOW_COPY_AND_ASSIGN(ExtendableBuffer);
static const size_t INITIAL_BUFFER_SIZE;
static const size_t MAX_BUFFER_SIZE;
static const size_t EXTEND_BUFFER_SIZE_STEP;
std::vector<uint8_t> mBuffer;
int mUsedSize;
};
}
#endif /* LATINIME_MMAPED_BUFFER_H */
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