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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.
*/
#include "packet/iterator.h"
#include "os/log.h"
namespace bluetooth {
namespace packet {
template <bool little_endian>
Iterator<little_endian>::Iterator(std::forward_list<View> data, size_t offset) {
data_ = data;
index_ = offset;
begin_ = 0;
end_ = 0;
for (auto& view : data) {
end_ += view.size();
}
}
template <bool little_endian>
Iterator<little_endian> Iterator<little_endian>::operator+(int offset) {
auto itr(*this);
return itr += offset;
}
template <bool little_endian>
Iterator<little_endian>& Iterator<little_endian>::operator+=(int offset) {
index_ += offset;
return *this;
}
template <bool little_endian>
Iterator<little_endian> Iterator<little_endian>::operator++(int) {
auto itr(*this);
index_++;
return itr;
}
template <bool little_endian>
Iterator<little_endian>& Iterator<little_endian>::operator++() {
index_++;
return *this;
}
template <bool little_endian>
Iterator<little_endian> Iterator<little_endian>::operator-(int offset) {
auto itr(*this);
return itr -= offset;
}
template <bool little_endian>
int Iterator<little_endian>::operator-(Iterator<little_endian>& itr) {
return index_ - itr.index_;
}
template <bool little_endian>
Iterator<little_endian>& Iterator<little_endian>::operator-=(int offset) {
index_ -= offset;
return *this;
}
template <bool little_endian>
Iterator<little_endian> Iterator<little_endian>::operator--(int) {
auto itr(*this);
if (index_ != 0) index_--;
return itr;
}
template <bool little_endian>
Iterator<little_endian>& Iterator<little_endian>::operator--() {
if (index_ != 0) index_--;
return *this;
}
template <bool little_endian>
Iterator<little_endian>& Iterator<little_endian>::operator=(const Iterator<little_endian>& itr) {
this->data_ = itr.data_;
this->begin_ = itr.begin_;
this->end_ = itr.end_;
this->index_ = itr.index_;
return *this;
}
template <bool little_endian>
bool Iterator<little_endian>::operator==(const Iterator<little_endian>& itr) const {
return index_ == itr.index_;
}
template <bool little_endian>
bool Iterator<little_endian>::operator!=(const Iterator<little_endian>& itr) const {
return !(*this == itr);
}
template <bool little_endian>
bool Iterator<little_endian>::operator<(const Iterator<little_endian>& itr) const {
return index_ < itr.index_;
}
template <bool little_endian>
bool Iterator<little_endian>::operator>(const Iterator<little_endian>& itr) const {
return index_ > itr.index_;
}
template <bool little_endian>
bool Iterator<little_endian>::operator<=(const Iterator<little_endian>& itr) const {
return index_ <= itr.index_;
}
template <bool little_endian>
bool Iterator<little_endian>::operator>=(const Iterator<little_endian>& itr) const {
return index_ >= itr.index_;
}
template <bool little_endian>
uint8_t Iterator<little_endian>::operator*() const {
ASSERT_LOG(index_ < end_ && !(begin_ > index_), "Index %zu out of bounds: [%zu,%zu)", index_, begin_, end_);
size_t index = index_;
for (auto view : data_) {
if (index < view.size()) {
return view[index];
}
index -= view.size();
}
ASSERT_LOG(false, "Out of fragments searching for index %zu", index_);
return 0;
}
template <bool little_endian>
size_t Iterator<little_endian>::NumBytesRemaining() const {
if (end_ > index_ && !(begin_ > index_)) {
return end_ - index_;
} else {
return 0;
}
}
template <bool little_endian>
Iterator<little_endian> Iterator<little_endian>::Subrange(size_t index, size_t length) const {
Iterator<little_endian> to_return(*this);
if (to_return.NumBytesRemaining() > index) {
to_return.index_ = to_return.index_ + index;
to_return.begin_ = to_return.index_;
if (to_return.NumBytesRemaining() >= length) {
to_return.end_ = to_return.index_ + length;
}
} else {
to_return.end_ = 0;
}
return to_return;
}
// Explicit instantiations for both types of Iterators.
template class Iterator<true>;
template class Iterator<false>;
} // namespace packet
} // namespace bluetooth