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