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100 lines
3.1 KiB
100 lines
3.1 KiB
/*
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* Copyright 2019 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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#pragma once
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#include <cstdint>
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#include <forward_list>
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#include <memory>
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#include <type_traits>
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#include "packet/custom_field_fixed_size_interface.h"
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#include "packet/view.h"
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namespace bluetooth {
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namespace packet {
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// Templated Iterator for endianness
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template <bool little_endian>
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class Iterator : public std::iterator<std::random_access_iterator_tag, uint8_t> {
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public:
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Iterator(const std::forward_list<View>& data, size_t offset);
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Iterator(const Iterator& itr) = default;
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virtual ~Iterator() = default;
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// All addition and subtraction operators are unbounded.
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Iterator operator+(int offset);
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Iterator& operator+=(int offset);
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Iterator& operator++();
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Iterator operator-(int offset);
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int operator-(Iterator& itr);
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Iterator& operator-=(int offset);
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Iterator& operator--();
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Iterator& operator=(const Iterator& itr);
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bool operator!=(const Iterator& itr) const;
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bool operator==(const Iterator& itr) const;
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bool operator<(const Iterator& itr) const;
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bool operator>(const Iterator& itr) const;
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bool operator<=(const Iterator& itr) const;
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bool operator>=(const Iterator& itr) const;
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uint8_t operator*() const;
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size_t NumBytesRemaining() const;
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Iterator Subrange(size_t index, size_t length) const;
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// Get the next sizeof(FixedWidthPODType) bytes and return the filled type
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template <typename FixedWidthPODType, typename std::enable_if<std::is_pod<FixedWidthPODType>::value, int>::type = 0>
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FixedWidthPODType extract() {
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static_assert(std::is_pod<FixedWidthPODType>::value, "Iterator::extract requires a fixed-width type.");
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FixedWidthPODType extracted_value{};
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uint8_t* value_ptr = (uint8_t*)&extracted_value;
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for (size_t i = 0; i < sizeof(FixedWidthPODType); i++) {
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size_t index = (little_endian ? i : sizeof(FixedWidthPODType) - i - 1);
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value_ptr[index] = this->operator*();
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this->operator++();
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}
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return extracted_value;
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}
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template <typename T, typename std::enable_if<std::is_base_of_v<CustomFieldFixedSizeInterface<T>, T>, int>::type = 0>
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T extract() {
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T extracted_value{};
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for (size_t i = 0; i < CustomFieldFixedSizeInterface<T>::length(); i++) {
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size_t index = (little_endian ? i : CustomFieldFixedSizeInterface<T>::length() - i - 1);
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extracted_value.data()[index] = this->operator*();
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this->operator++();
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}
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return extracted_value;
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}
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private:
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std::forward_list<View> data_;
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size_t index_;
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size_t begin_;
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size_t end_;
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};
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} // namespace packet
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} // namespace bluetooth
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