/*
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* Copyright 2018 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 <iterator>
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#include <memory>
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namespace bluetooth {
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// Forward declare Packet class
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class Packet;
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// Iterator is a custom iterator class for Packets.
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class Iterator
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: public std::iterator<std::random_access_iterator_tag, uint8_t> {
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public:
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Iterator(std::shared_ptr<const Packet> packet, size_t i);
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Iterator(const Iterator& itr);
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// All addition and subtraction operators are bounded from 0 to the length of
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// the packet.
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Iterator operator+(size_t offset);
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Iterator& operator+=(size_t offset);
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Iterator operator++(int);
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Iterator& operator++();
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Iterator operator-(size_t offset);
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int operator-(const Iterator& itr);
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Iterator& operator-=(size_t offset);
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Iterator operator--(int);
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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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template <typename FixedWidthIntegerType>
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FixedWidthIntegerType extract() {
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static_assert(std::is_integral<FixedWidthIntegerType>::value,
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"Iterator::extract requires an integral type.");
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FixedWidthIntegerType extracted_value = 0;
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for (size_t i = 0; i < sizeof(FixedWidthIntegerType); i++) {
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extracted_value |= static_cast<FixedWidthIntegerType>(**this) << i * 8;
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(*this)++;
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}
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return extracted_value;
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}
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// Extract in Little Endian Format
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template <typename FixedWidthIntegerType>
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FixedWidthIntegerType extractBE() {
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static_assert(std::is_integral<FixedWidthIntegerType>::value,
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"Iterator::extract requires an integral type.");
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FixedWidthIntegerType extracted_value = 0;
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for (size_t i = 0; i < sizeof(FixedWidthIntegerType); i++) {
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extracted_value |= static_cast<FixedWidthIntegerType>(**this)
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<< (sizeof(FixedWidthIntegerType) - 1 - i) * 8;
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(*this)++;
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}
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return extracted_value;
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}
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uint8_t extract8() { return extract<uint8_t>(); }
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uint16_t extract16() { return extract<uint16_t>(); }
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uint32_t extract32() { return extract<uint32_t>(); }
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uint64_t extract64() { return extract<uint64_t>(); }
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private:
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std::shared_ptr<const Packet> packet_;
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size_t index_;
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}; // Iterator
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} // namespace bluetooth
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