public:

explicit hpack_decoder(server::resource_budget budget) : table_(std::move(budget)) {}

// Called only when the local SETTINGS maximum has been acknowledged.

// A memory ceiling belongs to the resource budget, never this wire setting.

hpack_status acknowledge_maximum(std::uint64_t maximum) noexcept;

std::size_t acknowledged_maximum() const noexcept { return maximum_; }

bool usable() const noexcept { return usable_; }

const hpack_dynamic_table& table() const noexcept { return table_; }

hpack_section_result decode(std::span<const std::uint8_t> wire, hpack_section_limits limits);

private:

hpack_section_result fail(hpack_status status) noexcept;

hpack_status indexed(std::span<const std::uint8_t>& wire, std::size_t& remaining, hpack_field& field);

hpack_status literal(std::span<const std::uint8_t>& wire, std::size_t& remaining, hpack_field& field);

static hpack_status read_literal(std::optional<hpack_static_entry> entry, std::span<const std::uint8_t>& wire,

std::size_t& remaining, hpack_field& field);

hpack_status size_update(std::span<const std::uint8_t>& wire) noexcept;

hpack_section_result process(std::span<const std::uint8_t> wire, hpack_section_limits limits);

hpack_dynamic_table table_;

std::size_t maximum_ = 4096;

std::optional<std::size_t> required_minimum_;

bool usable_ = true;