parser.cpp

#include "parser.hpp"
#include "basic_header.hpp"
#include "common_header.hpp"
#include <vanetza/security/exception.hpp>
#include <vanetza/security/secured_message.hpp>
 
namespace vanetza
{
namespace geonet
{
 
Parser::Parser(ByteBuffer::const_iterator begin, ByteBuffer::const_iterator end) :
    m_byte_buffer_source(begin, end),
    m_stream(m_byte_buffer_source),
    m_archive(m_stream),
    m_read_bytes(0)
{
}
 
Parser::Parser(boost::iterator_range<ByteBuffer::const_iterator> range) :
    Parser(range.begin(), range.end())
{
}
 
std::size_t Parser::parse_basic(BasicHeader& basic)
{
    std::size_t bytes = 0;
    try {
        deserialize(basic, m_archive);
        bytes = BasicHeader::length_bytes;
    } catch (InputArchive::Exception&) {
    }
 
    m_read_bytes += bytes;
    return bytes;
}
 
std::size_t Parser::parse_common(CommonHeader& common)
{
    std::size_t bytes = 0;
    try {
        deserialize(common, m_archive);
        bytes = CommonHeader::length_bytes;
    } catch (InputArchive::Exception&) {
    }
 
    m_read_bytes += bytes;
    return bytes;
}
 
std::size_t Parser::parse_secured(boost::optional<security::SecuredMessage>& secured)
{
    std::size_t bytes = 0;
    try {
        std::uint8_t sec_first_byte = m_archive.peek_byte();
        if (sec_first_byte < 3) {
            security::v2::SecuredMessage msg;
            bytes = security::v2::deserialize(m_archive, msg);
            secured = std::move(msg);
        } else if (sec_first_byte == 3) {
            security::v3::SecuredMessage msg;
            bytes = security::v3::deserialize(m_archive, msg);
            secured = std::move(msg);
        }
    } catch (InputArchive::Exception&) {
    } catch (security::deserialization_error&) {
    }
 
    m_read_bytes += bytes;
    return bytes;
}
 
template<typename EXTENDED>
std::size_t deserialize_extended(InputArchive& archive, HeaderVariant& extended)
{
    EXTENDED header;
    deserialize(header, archive);
    extended = std::move(header);
    return EXTENDED::length_bytes;
}
 
std::size_t Parser::parse_extended(HeaderVariant& extended, HeaderType ht)
{
    std::size_t bytes = 0;
 
    try {
        switch (ht) {
            case HeaderType::TSB_Single_Hop:
                bytes = deserialize_extended<ShbHeader>(m_archive, extended);
                break;
            case HeaderType::GeoBroadcast_Circle:
            case HeaderType::GeoBroadcast_Rect:
            case HeaderType::GeoBroadcast_Elip:
                bytes = deserialize_extended<GeoBroadcastHeader>(m_archive, extended);
                break;
            case HeaderType::Beacon:
                bytes = deserialize_extended<BeaconHeader>(m_archive, extended);
                break;
            case HeaderType::Any:
            case HeaderType::GeoUnicast:
            case HeaderType::GeoAnycast_Circle:
            case HeaderType::GeoAnycast_Rect:
            case HeaderType::GeoAnycast_Elip:
            case HeaderType::TSB_Multi_Hop:
            case HeaderType::LS_Request:
            case HeaderType::LS_Reply:
                // unimplemented types
                break;
            default:
                // invalid types
                break;
        }
    } catch (InputArchive::Exception&) {
    }
 
    m_read_bytes += bytes;
    return bytes;
}
 
std::size_t Parser::parsed_bytes() const
{
    return m_read_bytes;
}
 
} // namespace geonet
} // namespace vanetza