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#pragma once |
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#include "Error.h" |
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#include "Frame.h" |
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#include "Message.h" |
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#include "iterator.h" |
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#include "DeflateExt.h" |
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#include "Utf8Checker.h" |
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#include |
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#include |
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#include |
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#include |
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#include |
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#include |
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#include |
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namespace panda { namespace protocol { namespace websocket { |
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using panda::string; |
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using panda::IteratorPair; |
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enum class DeflateFlag { NO, DEFAULT, YES }; |
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struct Parser : virtual panda::Refcnt { |
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// include child classes to solve cross-dependencies without moving one-liners to *.cc files (to avoid performance loses) |
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#include "Parser-FrameSender.h" |
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#include "Parser-MessageBuilder.h" |
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#include "Parser-MessageIterator.h" |
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using DeflateConfigOption = panda::optional; |
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struct Config { |
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Config () {} |
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size_t max_frame_size = 0; |
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size_t max_message_size = 0; |
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size_t max_handshake_size = http::SIZE_UNLIMITED; |
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bool check_utf8 = false; |
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DeflateConfigOption deflate = DeflateExt::Config(); |
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}; |
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void configure (const Config& cfg); |
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size_t max_frame_size () const { return _max_frame_size; } |
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size_t max_message_size () const { return _max_message_size; } |
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size_t max_handshake_size () const { return _max_handshake_size; } |
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bool established () const { return _flags[ESTABLISHED]; } |
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bool recv_closed () const { return _flags[RECV_CLOSED]; } |
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bool send_closed () const { return _flags[SEND_CLOSED]; } |
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FrameIteratorPair get_frames () { |
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return FrameIteratorPair(FrameIterator(this, _get_frame()), FrameIterator(this, NULL)); |
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} |
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MessageIteratorPair get_messages () { |
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return MessageIteratorPair(MessageIterator(this, _get_message()), MessageIterator(this, NULL)); |
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} |
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FrameIteratorPair get_frames (string& buf) { |
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if (_buffer) _buffer += buf; // user has not iterated previous call to get_frames till the end or remainder after handshake on client side |
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else _buffer = buf; |
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return get_frames(); |
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} |
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MessageIteratorPair get_messages (string& buf) { |
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if (_buffer) _buffer += buf; // user has not iterated previous call to get_frames till the end or remainder after handshake on client side |
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else _buffer = buf; |
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return get_messages(); |
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} |
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FrameSender start_message (Opcode opcode = Opcode::BINARY, DeflateFlag deflate = DeflateFlag::NO) { |
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_check_send(); |
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if (_flags[SEND_FRAME]) throw Error("can't start message: previous message wasn't finished"); |
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_flags.set(SEND_FRAME); |
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_send_opcode = opcode; |
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if (_deflate_ext && deflate != DeflateFlag::NO) _flags.set(SEND_DEFLATE); |
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return FrameSender(*this); |
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} |
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FrameSender start_message (DeflateFlag deflate) { return start_message(Opcode::BINARY, deflate); } |
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string send_frame (bool final) { |
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bool deflate = _flags[SEND_DEFLATE]; |
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auto header = _prepare_frame_header(final); |
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if (final && deflate) _deflate_ext->reset_tx(); |
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return Frame::compile(header); |
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} |
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StringPair send_frame(string& payload, bool final) { |
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bool deflate = _flags[SEND_DEFLATE]; |
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auto header = _prepare_frame_header(final); |
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if (deflate) _deflate_ext->compress(payload, final); |
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string hbin = Frame::compile(header, payload); |
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return make_string_pair(hbin, payload); |
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} |
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template |
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StringChain send_frame (It payload_begin, It payload_end, bool final) { |
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bool deflate = _flags[SEND_DEFLATE]; |
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auto header = _prepare_frame_header(final); |
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if (deflate) { |
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if (payload_begin == payload_end) { |
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string trailer; |
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_deflate_ext->compress(trailer, final); |
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string hbin = Frame::compile(header, trailer); |
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if (trailer) hbin += trailer; |
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return make_string_pair(hbin, payload_begin, payload_end); |
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} |
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payload_end = _deflate_ext->compress(payload_begin, payload_end, final); |
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} |
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string hbin = Frame::compile(header, payload_begin, payload_end); |
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return make_string_pair(hbin, payload_begin, payload_end); |
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} |
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MessageBuilder message () { return MessageBuilder(*this); } |
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string send_control (Opcode opcode) { return Frame::compile(_prepare_control_header(opcode)); } |
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StringPair send_control (Opcode opcode, string& payload) { |
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if (payload.length() > Frame::MAX_CONTROL_PAYLOAD) { |
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panda_log_critical("control frame payload is too long"); |
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payload.offset(0, Frame::MAX_CONTROL_PAYLOAD); |
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} |
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auto header = _prepare_control_header(opcode); |
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string hbin = Frame::compile(header, payload); |
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return make_string_pair(hbin, payload); |
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} |
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string send_ping () { return send_control(Opcode::PING); } |
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StringPair send_ping (string& payload) { return send_control(Opcode::PING, payload); } |
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string send_pong () { return send_control(Opcode::PONG); } |
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StringPair send_pong (string& payload) { return send_control(Opcode::PONG, payload); } |
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string send_close () { return send_control(Opcode::CLOSE); } |
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StringPair send_close (uint16_t code, const string& payload = string()) { |
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string frpld = FrameHeader::compile_close_payload(code, payload); |
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return send_control(Opcode::CLOSE, frpld); |
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} |
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uint16_t suggested_close_code () const { return _suggested_close_code; } |
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virtual void reset (); |
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bool is_deflate_active () const { return (bool)_deflate_ext; } |
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const DeflateConfigOption& deflate_config () const { return _deflate_cfg; } |
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DeflateConfigOption effective_deflate_config () const { |
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if (!_deflate_ext) return {}; |
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return _deflate_ext->effective_config(); |
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} |
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void no_deflate () { |
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if (!_flags[ESTABLISHED]) _deflate_cfg = DeflateConfigOption(); |
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} |
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virtual ~Parser () {} |
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protected: |
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using DeflateExtPtr = std::unique_ptr; |
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static const int ESTABLISHED = 1; // connection has been established |
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static const int RECV_FRAME = 2; // frame mode receive |
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static const int RECV_MESSAGE = 3; // message mode receive |
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static const int RECV_INFLATE = 4; // receiving compressed message |
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static const int RECV_TEXT = 5; // receiving text message |
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static const int RECV_CLOSED = 6; // no more messages from peer (close packet received) |
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static const int SEND_FRAME = 7; // outgoing message started |
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static const int SEND_DEFLATE = 8; // sending compressed message |
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static const int SEND_CLOSED = 9; // no more messages from user (close packet sent) |
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static const int LAST_FLAG = SEND_CLOSED; |
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size_t _max_frame_size; |
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size_t _max_message_size; |
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size_t _max_handshake_size; |
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DeflateConfigOption _deflate_cfg; |
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bool _check_utf8; |
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std::bitset<32> _flags = 0; |
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string _buffer; |
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DeflateExtPtr _deflate_ext; |
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Parser (bool recv_mask_required, Config cfg = Config()) : _recv_mask_required(recv_mask_required), _message_frame(recv_mask_required, cfg.max_frame_size) { |
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configure(cfg); |
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} |
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private: |
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bool _recv_mask_required; |
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FrameSP _frame; // current frame being received (frame mode) |
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int _frame_count = 0; // frame count for current message being received |
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MessageSP _message; // current message being received (message mode) |
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Frame _message_frame; // current frame being received (message mode) |
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int _sent_frame_count = 0; // frame count for current message being sent (frame mode) |
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Opcode _send_opcode; // opcode for first frame to be sent (frame mode) |
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uint16_t _suggested_close_code = 0; // suggested close code to send to peer after error or receiving close frame from peer |
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Utf8Checker _utf8_checker; |
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std::deque _simple_payload_tmp; |
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FrameSP _get_frame (); |
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MessageSP _get_message (); |
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bool _parse_frame (Frame&); |
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void _check_send () const { |
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if (!_flags[ESTABLISHED]) throw Error("not established"); |
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if (_flags[SEND_CLOSED]) throw Error("close sent, can't send anymore"); |
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} |
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FrameHeader _prepare_control_header (Opcode opcode); |
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FrameHeader _prepare_frame_header (bool final); |
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friend struct FrameSender; |
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friend struct MessageBuilder; |
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}; |
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using FrameIteratorPair = Parser::FrameIteratorPair; |
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using FrameIterator = Parser::FrameIterator; |
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using MessageIteratorPair = Parser::MessageIteratorPair; |
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using MessageIterator = Parser::MessageIterator; |
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using FrameSender = Parser::FrameSender; |
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using MessageBuilder = Parser::MessageBuilder; |
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using ParserSP = iptr; |
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}}} |