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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 <stdint.h>
#include "defines.h"
#include "utils/exclusive_ownership_pointer.h"
namespace latinime {
class MmappedBuffer {
public:
typedef ExclusiveOwnershipPointer<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();
AK_FORCE_INLINE uint8_t *getBuffer() const {
return mBuffer;
}
AK_FORCE_INLINE int getBufferSize() const {
return mBufferSize;
}
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)
: mBuffer(buffer), mBufferSize(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)
: mBuffer(0), mBufferSize(0), mMmappedBuffer(0), mAlignedSize(0), mMmapFd(0),
mIsUpdatable(isUpdatable) {}
DISALLOW_IMPLICIT_CONSTRUCTORS(MmappedBuffer);
uint8_t *const mBuffer;
const int mBufferSize;
void *const mMmappedBuffer;
const int mAlignedSize;
const int mMmapFd;
const bool mIsUpdatable;
};
}
#endif /* LATINIME_MMAPPED_BUFFER_H */
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