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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_MMAPPED_BUFFER_H
#define LATINIME_MMAPPED_BUFFER_H
#include <cstdint>
#include <memory>
#include "defines.h"
#include "utils/byte_array_view.h"
namespace latinime {
class MmappedBuffer {
public:
typedef std::unique_ptr<const MmappedBuffer> MmappedBufferPtr;
static MmappedBufferPtr openBuffer(const char *const path,
const int bufferOffset, const int bufferSize, const bool isUpdatable);
// Mmap entire file.
static MmappedBufferPtr openBuffer(const char *const path, const bool isUpdatable);
static MmappedBufferPtr openBuffer(const char *const dirPath, const char *const fileName,
const bool isUpdatable);
~MmappedBuffer();
ReadWriteByteArrayView getReadWriteByteArrayView() const {
return mByteArrayView;
}
ReadOnlyByteArrayView getReadOnlyByteArrayView() const {
return mByteArrayView.getReadOnlyView();
}
AK_FORCE_INLINE bool isUpdatable() const {
return mIsUpdatable;
}
private:
AK_FORCE_INLINE MmappedBuffer(uint8_t *const buffer, const int bufferSize,
void *const mmappedBuffer, const int alignedSize, const int mmapFd,
const bool isUpdatable)
: mByteArrayView(buffer, bufferSize), mMmappedBuffer(mmappedBuffer),
mAlignedSize(alignedSize), mMmapFd(mmapFd), mIsUpdatable(isUpdatable) {}
// Empty file. We have to handle an empty file as a valid part of a dictionary.
AK_FORCE_INLINE MmappedBuffer(const bool isUpdatable)
: mByteArrayView(), mMmappedBuffer(nullptr), mAlignedSize(0),
mMmapFd(0), mIsUpdatable(isUpdatable) {}
DISALLOW_IMPLICIT_CONSTRUCTORS(MmappedBuffer);
const ReadWriteByteArrayView mByteArrayView;
void *const mMmappedBuffer;
const int mAlignedSize;
const int mMmapFd;
const bool mIsUpdatable;
};
}
#endif /* LATINIME_MMAPPED_BUFFER_H */
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