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