Class BlockFilter

src/blockfilter.h:110–169

* Complete block filter struct as defined in BIP 157. Serialization matches * payload of "cfilter" messages. */

 * payload of "cfilter" messages.
 */
class BlockFilter
{
private:
    BlockFilterType m_filter_type = BlockFilterType::INVALID;
    uint256 m_block_hash;
    GCSFilter m_filter;

    bool BuildParams(GCSFilter::Params& params) const;

public:

    BlockFilter() = default;

    //! Reconstruct a BlockFilter from parts.
    BlockFilter(BlockFilterType filter_type, const uint256& block_hash,
                std::vector<unsigned char> filter);

    //! Construct a new BlockFilter of the specified type from a block.
    BlockFilter(BlockFilterType filter_type, const CBlock& block, const CBlockUndo& block_undo);

    BlockFilterType GetFilterType() const { return m_filter_type; }
    const uint256& GetBlockHash() const { return m_block_hash; }
    const GCSFilter& GetFilter() const { return m_filter; }

    const std::vector<unsigned char>& GetEncodedFilter() const
    {
        return m_filter.GetEncoded();
    }

    //! Compute the filter hash.
    uint256 GetHash() const;

    //! Compute the filter header given the previous one.
    uint256 ComputeHeader(const uint256& prev_header) const;

    template <typename Stream>
    void Serialize(Stream& s) const {
        s << static_cast<uint8_t>(m_filter_type)
          << m_block_hash
          << m_filter.GetEncoded();
    }

    template <typename Stream>
    void Unserialize(Stream& s) {
        std::vector<unsigned char> encoded_filter;
        uint8_t filter_type;

        s >> filter_type
          >> m_block_hash
          >> encoded_filter;

        m_filter_type = static_cast<BlockFilterType>(filter_type);

        GCSFilter::Params params;
        if (!BuildParams(params)) {
            throw std::ios_base::failure("unknown filter_type");
        }
        m_filter = GCSFilter(params, std::move(encoded_filter));