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 FLASHING.md says how to take a newer version of the colleague's tree (copy it over the folder, rebuild, test, commit).
50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
#ifndef LENGTH_CODING_HPP_UQ1OIDUN
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#define LENGTH_CODING_HPP_UQ1OIDUN
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#include <vanetza/common/byte_buffer.hpp>
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#include <boost/range/iterator_range.hpp>
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#include <cstdint>
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#include <tuple>
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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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/**
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* Calculate length coding for variable length fields
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* \param length Data field length in bytes, e.g. size of a buffer
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* \return byte buffer containing encoded length, prepend to data
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*/
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ByteBuffer encode_length(std::uintmax_t length);
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/**
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* Extract length information
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* \param buffer Buffer with input data, shall start with first byte of encoded length
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* \return iterator pointing at start of payload buffer (begin indicates error) and its length
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*/
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std::tuple<ByteBuffer::const_iterator, std::uintmax_t> decode_length(const ByteBuffer& buffer);
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/**
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* Count number of leading one bits
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* \param a byte
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* \return number of leadings ones in given byte
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*/
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std::size_t count_leading_ones(std::uint8_t);
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/**
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* Determines the number of bytes, needed to store a given size
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* \param size
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* \return number of bytes needed to store length
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*/
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std::size_t length_coding_size(std::uintmax_t);
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} // namespace v2
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} // namespace security
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} // namespace vanetza
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#endif /* LENGTH_CODING_HPP_UQ1OIDUN */
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