| /* |
| * 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 */ |