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/*
* Copyright (C) 2014 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_BYTE_ARRAY_VIEW_H
#define LATINIME_BYTE_ARRAY_VIEW_H
#include <cstdint>
#include <cstdlib>
#include "defines.h"
namespace latinime {
/**
* Helper class used to keep track of read accesses for a given memory region.
*/
class ReadOnlyByteArrayView {
public:
ReadOnlyByteArrayView() : mPtr(nullptr), mSize(0) {}
ReadOnlyByteArrayView(const uint8_t *const ptr, const size_t size)
: mPtr(ptr), mSize(size) {}
AK_FORCE_INLINE size_t size() const {
return mSize;
}
AK_FORCE_INLINE const uint8_t *data() const {
return mPtr;
}
AK_FORCE_INLINE const ReadOnlyByteArrayView skip(const size_t n) const {
if (mSize <= n) {
return ReadOnlyByteArrayView();
}
return ReadOnlyByteArrayView(mPtr + n, mSize - n);
}
private:
DISALLOW_ASSIGNMENT_OPERATOR(ReadOnlyByteArrayView);
const uint8_t *const mPtr;
const size_t mSize;
};
/**
* Helper class used to keep track of read-write accesses for a given memory region.
*/
class ReadWriteByteArrayView {
public:
ReadWriteByteArrayView() : mPtr(nullptr), mSize(0) {}
ReadWriteByteArrayView(uint8_t *const ptr, const size_t size)
: mPtr(ptr), mSize(size) {}
AK_FORCE_INLINE size_t size() const {
return mSize;
}
AK_FORCE_INLINE uint8_t *data() const {
return mPtr;
}
AK_FORCE_INLINE ReadOnlyByteArrayView getReadOnlyView() const {
return ReadOnlyByteArrayView(mPtr, mSize);
}
ReadWriteByteArrayView subView(const size_t start, const size_t n) const {
ASSERT(start + n <= mSize);
return ReadWriteByteArrayView(mPtr + start, n);
}
private:
// Default copy constructor and assignment operator are used for using this class with STL
// containers.
// These members cannot be const to have the assignment operator.
uint8_t *mPtr;
size_t mSize;
};
} // namespace latinime
#endif // LATINIME_BYTE_ARRAY_VIEW_H
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