Ashin Walpola
0e9525162d
obu-firmware builds against vanetza-idf from microbu-esp32c5/external, but that tree was gitignored, so a clone of this repository could not build the firmware it ships. It is now committed here as ordinary files in its own folder, microbu-esp32c5/: the colleague's commit cf4b99f plus the V2X2MAP bridge's signature verification (--trust) used on the bench. Nothing is fetched from or pushed to the colleague's repository; this repository and its remotes carry everything. The folder's own .gitignore keeps build output, downloaded components and private key material out, as it did there; the committed file set is identical to that repository's tracked files. The ESP32-C5 is still flashed from obu-firmware/, which only takes vanetza-idf from microbu-esp32c5/, so the two stay separate folders. FLASHING.md says how to take a newer version of the colleague's tree (copy it over the folder, rebuild, test, commit).
122 lines
3.2 KiB
C++
122 lines
3.2 KiB
C++
#ifndef SERIALIZATION_HPP_IENSIAL4
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#define SERIALIZATION_HPP_IENSIAL4
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#include <vanetza/common/serialization.hpp>
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#include <vanetza/security/v2/length_coding.hpp>
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#include <cassert>
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#include <list>
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namespace vanetza
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{
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namespace security
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{
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namespace v2
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{
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using vanetza::serialize;
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using vanetza::deserialize;
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/**
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* \brief Serialize given length
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* \param ar to serialize in
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* \param size to encode
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*/
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void serialize_length(OutputArchive&, std::uintmax_t);
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/**
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* \brief Deserialize length from a given archive
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* \param ar shall start with encoded length
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* \return length deserialized from archive
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*/
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std::uintmax_t deserialize_length(InputArchive&);
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/**
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* \brief Calculate size of a list
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*
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* Sums up sizes of all list elements only, length itself is not included.
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* Therefore, the returned length is suitable as argument for serialize_length.
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*
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* \tparam T list element type
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* \param list
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* \return accumulated elements' size
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*/
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template<class T>
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size_t get_size(const std::list<T>& list)
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{
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using vanetza::security::v2::get_size;
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size_t size = 0;
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for (auto& elem : list) {
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size += get_size(elem);
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}
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return size;
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}
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/**
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* \brief Trim (possibly) wider size type safely
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*
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* This function throws an exception if size would be truncated.
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*
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* \param in wide size type
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* \return same size using narrow type
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*/
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std::size_t trim_size(std::uintmax_t in);
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/** \brief Serialize from any given list into given binary archive
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* \tparam T the type of the list
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* \tparam ARGS all additional arguments for the underlying functions
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* \param ar to serialize in
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* \param list
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* \param args the additional arguments
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*/
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template<class T, typename... ARGS>
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void serialize(OutputArchive& ar, const std::list<T>& list, ARGS&&... args)
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{
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using vanetza::security::v2::get_size;
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using vanetza::security::v2::serialize;
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size_t size = get_size(list);
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serialize_length(ar, size);
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for (auto& elem : list) {
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serialize(ar, elem, std::forward<ARGS>(args)...);
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}
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}
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/** \brief Deserialize a list from given archive
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* \tparam T the type of the list
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* \tparam ARGS all additional arguments for the underlying functions
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* \param ar, shall start with the list
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* \param args the additional arguments
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* \return size of the deserialized list in bytes
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*/
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template<class T, typename... ARGS>
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std::size_t deserialize(InputArchive& ar, std::list<T>& list, ARGS&&... args)
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{
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using vanetza::security::v2::deserialize;
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static const std::size_t length_limit = 4096;
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const auto length = trim_size(deserialize_length(ar));
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if (length <= length_limit) {
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std::size_t remainder = length;
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while (remainder > 0) {
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T t;
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std::size_t size = deserialize(ar, t, std::forward<ARGS>(args)...);
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if (size <= remainder && ar.is_good()) {
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list.push_back(std::move(t));
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remainder -= size;
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} else {
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ar.fail(InputArchive::ErrorCode::ConstraintViolation);
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break;
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}
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}
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} else {
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ar.fail(InputArchive::ErrorCode::ExcessiveLength);
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}
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return length;
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}
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} // namespace v2
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} // namespace security
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} // namespace vanetza
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#endif /* SERIALIZATION_HPP_IENSIAL4 */
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