Ashin Walpola
d107534eb2
obu-firmware builds against the vanetza-idf C-ITS library, which until now came from the colleague's microbu-esp32c5 tree beside the repository and was not tracked here, so a clone of this repository could not build the firmware it ships. The library alone is now part of obu-firmware, as obu-firmware/external/vanetza-idf: their external/vanetza-idf at commit cf4b99f, unchanged (9775 files; see its PROVENANCE.md). CMake takes it from there by default; -DVANETZA_IDF_DIR still points the build elsewhere. The rest of the colleague's tree (their own VAM firmware, PKI tooling, station-link Python tools, the V2X2MAP bridge) stays out of this repository and gitignored; nothing is pushed to their repository. NOTES.md, docs/06, TODO.md and the pcap verifier's usage line point at the new location.
91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
#ifndef PACKET_VISITOR_HPP_UYSI8HXZ
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#define PACKET_VISITOR_HPP_UYSI8HXZ
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#include <vanetza/asn1/asn1c_conversion.hpp>
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#include <vanetza/common/byte_buffer.hpp>
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#include <vanetza/net/chunk_packet.hpp>
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#include <vanetza/net/cohesive_packet.hpp>
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#include <vanetza/net/osi_layer.hpp>
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#include <vanetza/net/packet_variant.hpp>
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#include <boost/variant/static_visitor.hpp>
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#include <memory>
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namespace vanetza
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{
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namespace asn1
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{
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/**
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* PacketVisitor is a helper to extract the ASN.1 wrapper object from a packet's application layer.
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* This is a generalised version of the implementation found in Artery before.
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*
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* ChunkPacket's application layer is simply casted for the sake of speed whenever possible.
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* When casting fails, this helper can fall back to deserialization, see allow_chunk_deserialization.
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* Deserialization is the only option for CohesivePacket's application layer.
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*
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* \param T is the asn1c_wrapper<> type, e.g. Cam or Denm
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*/
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template<typename T>
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class PacketVisitor : public boost::static_visitor<std::shared_ptr<const T>>
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{
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public:
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std::shared_ptr<const T> operator()(const ChunkPacket& packet)
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{
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using byte_buffer_impl = convertible::byte_buffer_impl<T>;
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auto impl = dynamic_cast<const byte_buffer_impl*>(packet[OsiLayer::Application].ptr());
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if (impl) {
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m_wrapper = impl->wrapper();
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} else if (m_deserialize_chunk) {
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deserialize(create_byte_view(packet, m_start_layer, OsiLayer::Application));
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} else {
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m_wrapper.reset();
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}
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return m_wrapper;
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}
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std::shared_ptr<const T> operator()(const CohesivePacket& packet)
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{
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deserialize(create_byte_view(packet, m_start_layer, OsiLayer::Application));
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return m_wrapper;
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}
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std::shared_ptr<const T> get_shared_wrapper() const { return m_wrapper; }
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/**
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* Allow deserialization attempt of ChunkPacket when casting failed.
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* \param flag true allows deserialization
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*/
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void allow_chunk_deserialization(bool flag)
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{
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m_deserialize_chunk = flag;
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}
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/**
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* Set OSI layer where deserialization shall start, it always stops at end of OsiLayer::Application.
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* By default, PacketVisitors starts at OsiLayer::Session for compatibility with BTP parser functions.
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* \param start OSI layer
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*/
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void start_deserialization_at(OsiLayer start)
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{
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m_start_layer = start;
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}
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private:
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void deserialize(const byte_view_range& range)
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{
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auto tmp = std::make_shared<T>();
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bool decoded = tmp->decode(range.begin().raw(), range.size());
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m_wrapper = decoded ? tmp : nullptr;
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}
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std::shared_ptr<const T> m_wrapper;
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bool m_deserialize_chunk = true;
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OsiLayer m_start_layer = OsiLayer::Session;
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};
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} // namespace asn1
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} // namespace vanetza
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#endif /* PACKET_VISITOR_HPP_UYSI8HXZ */
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