| /* |
| * 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)); |
| } |
| |
| template <bool little_endian> |
| void PacketView<little_endian>::Append(PacketView to_add) { |
| auto insertion_point = fragments_.begin(); |
| size_t remaining_length = length_; |
| while (remaining_length > 0) { |
| remaining_length -= insertion_point->size(); |
| if (remaining_length > 0) { |
| insertion_point++; |
| } |
| } |
| ASSERT(insertion_point != fragments_.end()); |
| for (const auto& fragment : to_add.fragments_) { |
| fragments_.insert_after(insertion_point, fragment); |
| insertion_point++; |
| } |
| length_ += to_add.length_; |
| } |
| |
| // Explicit instantiations for both types of PacketViews. |
| template class PacketView<true>; |
| template class PacketView<false>; |
| } // namespace packet |
| } // namespace bluetooth |