extend the protocol to support larger data packets and set it to the new tox constants numbers

solanaceae/ngc_ext/ngcext.cpp

@@ -112,6 +112,8 @@ bool NGCEXTEventProvider::parse_ft1_init_ack(
 	_DATA_HAVE(sizeof(e.transfer_id), std::cerr << "NGCEXT: packet too small, missing transfer_id\n"; return false)
 	e.transfer_id = data[curser++];
 
+	e.max_lossy_data_size = 500-4; // -4 and 500 are hardcoded
+
 	return dispatch(
 		NGCEXT_Event::FT1_INIT_ACK,
 		e
@@ -224,6 +226,41 @@ bool NGCEXTEventProvider::parse_ft1_message(
 	);
 }
 
+bool NGCEXTEventProvider::parse_ft1_init_ack_v2(
+	uint32_t group_number, uint32_t peer_number,
+	const uint8_t* data, size_t data_size,
+	bool _private
+) {
+	if (!_private) {
+		std::cerr << "NGCEXT: ft1_init_ack_v2 cant be public\n";
+		return false;
+	}
+
+	Events::NGCEXT_ft1_init_ack e;
+	e.group_number = group_number;
+	e.peer_number = peer_number;
+	size_t curser = 0;
+
+	// - 1 byte (temporary_file_tf_id)
+	_DATA_HAVE(sizeof(e.transfer_id), std::cerr << "NGCEXT: packet too small, missing transfer_id\n"; return false)
+	e.transfer_id = data[curser++];
+
+	// - 2 byte (max_lossy_data_size)
+	if ((data_size - curser) >= sizeof(e.max_lossy_data_size)) {
+		e.max_lossy_data_size = 0;
+		for (size_t i = 0; i < sizeof(e.max_lossy_data_size); i++, curser++) {
+			e.max_lossy_data_size |= uint16_t(data[curser]) << (i*8);
+		}
+	} else {
+		e.max_lossy_data_size = 500-4; // default
+	}
+
+	return dispatch(
+		NGCEXT_Event::FT1_INIT_ACK,
+		e
+	);
+}
+
 bool NGCEXTEventProvider::handlePacket(
 	const uint32_t group_number,
 	const uint32_t peer_number,
@@ -247,7 +284,8 @@ bool NGCEXTEventProvider::handlePacket(
 		case NGCEXT_Event::FT1_INIT:
 			return parse_ft1_init(group_number, peer_number, data+1, data_size-1, _private);
 		case NGCEXT_Event::FT1_INIT_ACK:
-			return parse_ft1_init_ack(group_number, peer_number, data+1, data_size-1, _private);
+			//return parse_ft1_init_ack(group_number, peer_number, data+1, data_size-1, _private);
+			return parse_ft1_init_ack_v2(group_number, peer_number, data+1, data_size-1, _private);
 		case NGCEXT_Event::FT1_DATA:
 			return parse_ft1_data(group_number, peer_number, data+1, data_size-1, _private);
 		case NGCEXT_Event::FT1_DATA_ACK:

solanaceae/ngc_ext/ngcext.hpp

@@ -70,8 +70,6 @@ namespace Events {
 
 		// - X bytes (file_kind dependent id, differnt sizes)
 		std::vector<uint8_t> file_id;
-
-		// TODO: max supported lossy packet size
 	};
 
 	struct NGCEXT_ft1_init_ack {
@@ -81,7 +79,8 @@ namespace Events {
 		// - 1 byte (transfer_id)
 		uint8_t transfer_id;
 
-		// TODO: max supported lossy packet size
+		// - 2 byte (self_max_lossy_data_size)
+		uint16_t max_lossy_data_size;
 	};
 
 	struct NGCEXT_ft1_data {
@@ -163,6 +162,7 @@ enum class NGCEXT_Event : uint8_t {
 	// acknowlage init (like an accept)
 	// like tox ft control continue
 	// - 1 byte (transfer_id)
+	// - 2 byte (self_max_lossy_data_size) (optional since v2)
 	FT1_INIT_ACK,
 
 	// TODO: init deny, speed up non acceptance
@@ -263,6 +263,12 @@ class NGCEXTEventProvider : public ToxEventI, public NGCEXTEventProviderI {
 			bool _private
 		);
 
+		bool parse_ft1_init_ack_v2(
+			uint32_t group_number, uint32_t peer_number,
+			const uint8_t* data, size_t data_size,
+			bool _private
+		);
+
 		bool handlePacket(
 			const uint32_t group_number,
 			const uint32_t peer_number,

solanaceae/ngc_ft1/ngcft1.cpp

@@ -71,6 +71,12 @@ bool NGCFT1::sendPKG_FT1_INIT_ACK(
 	pkg.push_back(static_cast<uint8_t>(NGCEXT_Event::FT1_INIT_ACK));
 	pkg.push_back(transfer_id);
 
+	// - 2 bytes max_lossy_data_size
+	const uint16_t max_lossy_data_size = _t.toxGroupMaxCustomLossyPacketLength() - 4;
+	for (size_t i = 0; i < sizeof(uint16_t); i++) {
+		pkg.push_back((max_lossy_data_size>>(i*8)) & 0xff);
+	}
+
 	// lossless
 	return _t.toxGroupSendCustomPrivatePacket(group_number, peer_number, true, pkg) == TOX_ERR_GROUP_SEND_CUSTOM_PRIVATE_PACKET_OK;
 }
@@ -283,6 +289,7 @@ void NGCFT1::updateSendTransfer(float time_delta, uint32_t group_number, uint32_
 }
 
 void NGCFT1::iteratePeer(float time_delta, uint32_t group_number, uint32_t peer_number, Group::Peer& peer) {
+	if (peer.cca) {
 		auto timeouts = peer.cca->getTimeouts();
 		std::set<CCAI::SeqIDType> timeouts_set{timeouts.cbegin(), timeouts.cend()};
 
@@ -302,6 +309,7 @@ void NGCFT1::iteratePeer(float time_delta, uint32_t group_number, uint32_t peer_
 				updateSendTransfer(time_delta, group_number, peer_number, peer, idx, timeouts_set, can_packet_size);
 			}
 		}
+	}
 
 	// TODO: receiving tranfers?
 }
@@ -473,7 +481,7 @@ bool NGCFT1::onEvent(const Events::NGCEXT_ft1_init& e) {
 
 bool NGCFT1::onEvent(const Events::NGCEXT_ft1_init_ack& e) {
 //#if !NDEBUG
-	std::cout << "NGCFT1: FT1_INIT_ACK\n";
+	std::cout << "NGCFT1: FT1_INIT_ACK mds:" << e.max_lossy_data_size << "\n";
 //#endif
 
 	// we now should start sending data
@@ -493,10 +501,18 @@ bool NGCFT1::onEvent(const Events::NGCEXT_ft1_init_ack& e) {
 
 	using State = Group::Peer::SendTransfer::State;
 	if (transfer.state != State::INIT_SENT) {
-		std::cerr << "NGCFT1 error: inti_ack but not in INIT_SENT state\n";
+		std::cerr << "NGCFT1 error: init_ack but not in INIT_SENT state\n";
 		return true;
 	}
 
+	// negotiated packet_data_size
+	const auto negotiated_packet_data_size = std::min<uint32_t>(e.max_lossy_data_size, _t.toxGroupMaxCustomLossyPacketLength()-4);
+	// TODO: reset cca with new pkg size
+	if (!peer.cca) {
+		peer.max_packet_data_size = negotiated_packet_data_size;
+		peer.cca = std::make_unique<CUBIC>(peer.max_packet_data_size);
+	}
+
 	// iterate will now call NGC_FT1_send_data_cb
 	transfer.state = State::SENDING;
 	transfer.time_since_activity = 0.f;
@@ -698,7 +714,7 @@ bool NGCFT1::onToxEvent(const Tox_Event_Group_Peer_Exit* e) {
 	}
 
 	// reset cca
-	peer.cca = std::make_unique<CUBIC>(500-4); // TODO: replace with tox_group_max_custom_lossy_packet_length()-4
+	peer.cca.reset(); // dont actually reallocate
 
 	return false;
 }

solanaceae/ngc_ft1/ngcft1.hpp

@@ -2,6 +2,7 @@
 
 // solanaceae port of tox_ngc_ft1
 
+#include <cstdint>
 #include <solanaceae/toxcore/tox_interface.hpp>
 #include <solanaceae/toxcore/tox_event_interface.hpp>
 
@@ -141,7 +142,9 @@ class NGCFT1 : public ToxEventI, public NGCEXTEventI, public NGCFT1EventProvider
 
 	struct Group {
 		struct Peer {
-			std::unique_ptr<CCAI> cca = std::make_unique<CUBIC>(500-4); // TODO: replace with tox_group_max_custom_lossy_packet_length()-4
+			uint32_t max_packet_data_size {500-4};
+			//std::unique_ptr<CCAI> cca = std::make_unique<CUBIC>(max_packet_data_size); // TODO: replace with tox_group_max_custom_lossy_packet_length()-4
+			std::unique_ptr<CCAI> cca;
 
 			struct RecvTransfer {
 				uint32_t file_kind;