77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
/*
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* Copyright (C) 2013, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef LATINIME_MMAPPED_BUFFER_H
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#define LATINIME_MMAPPED_BUFFER_H
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#include <cstdint>
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#include <memory>
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#include "defines.h"
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#include "utils/byte_array_view.h"
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namespace latinime {
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class MmappedBuffer {
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public:
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typedef std::unique_ptr<const MmappedBuffer> MmappedBufferPtr;
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static MmappedBufferPtr openBuffer(const char *const path,
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const int bufferOffset, const int bufferSize, const bool isUpdatable);
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// Mmap entire file.
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static MmappedBufferPtr openBuffer(const char *const path, const bool isUpdatable);
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static MmappedBufferPtr openBuffer(const char *const dirPath, const char *const fileName,
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const bool isUpdatable);
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~MmappedBuffer();
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ReadWriteByteArrayView getReadWriteByteArrayView() const {
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return mByteArrayView;
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}
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ReadOnlyByteArrayView getReadOnlyByteArrayView() const {
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return mByteArrayView.getReadOnlyView();
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}
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AK_FORCE_INLINE bool isUpdatable() const {
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return mIsUpdatable;
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}
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private:
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AK_FORCE_INLINE MmappedBuffer(uint8_t *const buffer, const int bufferSize,
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void *const mmappedBuffer, const int alignedSize, const int mmapFd,
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const bool isUpdatable)
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: mByteArrayView(buffer, bufferSize), mMmappedBuffer(mmappedBuffer),
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mAlignedSize(alignedSize), mMmapFd(mmapFd), mIsUpdatable(isUpdatable) {}
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// Empty file. We have to handle an empty file as a valid part of a dictionary.
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AK_FORCE_INLINE MmappedBuffer(const bool isUpdatable)
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: mByteArrayView(), mMmappedBuffer(nullptr), mAlignedSize(0),
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mMmapFd(0), mIsUpdatable(isUpdatable) {}
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DISALLOW_IMPLICIT_CONSTRUCTORS(MmappedBuffer);
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const ReadWriteByteArrayView mByteArrayView;
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void *const mMmappedBuffer;
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const int mAlignedSize;
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const int mMmapFd;
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const bool mIsUpdatable;
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};
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}
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#endif /* LATINIME_MMAPPED_BUFFER_H */
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