/*
|
* 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/packet_view.h"
|
|
#include <algorithm>
|
|
#include "os/log.h"
|
|
namespace bluetooth {
|
namespace packet {
|
|
template <bool little_endian>
|
PacketView<little_endian>::PacketView(const std::forward_list<class View> fragments)
|
: fragments_(fragments), length_(0) {
|
for (auto fragment : fragments_) {
|
length_ += fragment.size();
|
}
|
}
|
|
template <bool little_endian>
|
PacketView<little_endian>::PacketView(std::shared_ptr<std::vector<uint8_t>> packet)
|
: fragments_({View(packet, 0, packet->size())}), length_(packet->size()) {}
|
|
template <bool little_endian>
|
Iterator<little_endian> PacketView<little_endian>::begin() const {
|
return Iterator<little_endian>(this->fragments_, 0);
|
}
|
|
template <bool little_endian>
|
Iterator<little_endian> PacketView<little_endian>::end() const {
|
return Iterator<little_endian>(this->fragments_, size());
|
}
|
|
template <bool little_endian>
|
uint8_t PacketView<little_endian>::operator[](size_t index) const {
|
return at(index);
|
}
|
|
template <bool little_endian>
|
uint8_t PacketView<little_endian>::at(size_t index) const {
|
ASSERT_LOG(index < length_, "Index %zu out of bounds", index);
|
for (const auto& fragment : fragments_) {
|
if (index < fragment.size()) {
|
return fragment[index];
|
}
|
index -= fragment.size();
|
}
|
ASSERT_LOG(false, "Out of fragments searching for index %zu", index);
|
return 0;
|
}
|
|
template <bool little_endian>
|
size_t PacketView<little_endian>::size() const {
|
return length_;
|
}
|
|
template <bool little_endian>
|
std::forward_list<View> PacketView<little_endian>::GetSubviewList(size_t begin, size_t end) const {
|
ASSERT(begin <= end);
|
ASSERT(end <= length_);
|
|
std::forward_list<View> view_list;
|
std::forward_list<View>::iterator it = view_list.before_begin();
|
size_t length = end - begin;
|
for (const auto& fragment : fragments_) {
|
if (begin >= fragment.size()) {
|
begin -= fragment.size();
|
} else {
|
View view(fragment, begin, begin + std::min(length, fragment.size() - begin));
|
length -= view.size();
|
it = view_list.insert_after(it, view);
|
begin = 0;
|
}
|
}
|
return view_list;
|
}
|
|
template <bool little_endian>
|
PacketView<true> PacketView<little_endian>::GetLittleEndianSubview(size_t begin, size_t end) const {
|
return PacketView<true>(GetSubviewList(begin, end));
|
}
|
|
template <bool little_endian>
|
PacketView<false> PacketView<little_endian>::GetBigEndianSubview(size_t begin, size_t end) const {
|
return PacketView<false>(GetSubviewList(begin, end));
|
}
|
|
// Explicit instantiations for both types of PacketViews.
|
template class PacketView<true>;
|
template class PacketView<false>;
|
} // namespace packet
|
} // namespace bluetooth
|
