From: Daniel Karbach <daniel.karbach@localhorst.tv>
Date: Mon, 7 Sep 2015 14:37:43 +0000 (+0200)
Subject: also tell connection handlers about ack'd packets
X-Git-Url: https://git.localhorst.tv/?a=commitdiff_plain;h=b5a83cd3df5083ed0cccfe4876143e788b3836f9;p=blank.git

also tell connection handlers about ack'd packets
---

diff --git a/src/net/ConnectionHandler.hpp b/src/net/ConnectionHandler.hpp
index 29595e5..ab9761a 100644
--- a/src/net/ConnectionHandler.hpp
+++ b/src/net/ConnectionHandler.hpp
@@ -13,6 +13,9 @@ class ConnectionHandler {
 public:
 	void Handle(const UDPpacket &);
 
+	// called as soon as the remote end ack'd given packet
+	virtual void OnPacketReceived(std::uint16_t) { }
+	// called if the remote end probably didn't get given packet
 	virtual void OnPacketLost(std::uint16_t) { }
 
 	virtual void OnTimeout() { }
diff --git a/src/net/Packet.hpp b/src/net/Packet.hpp
index 0dab949..4ff45df 100644
--- a/src/net/Packet.hpp
+++ b/src/net/Packet.hpp
@@ -21,6 +21,11 @@ struct Packet {
 		std::uint16_t seq;
 		std::uint16_t ack;
 		std::uint32_t hist;
+
+		// true if this contains an ack for given (remote) seq
+		bool Acks(std::uint16_t) const noexcept;
+		std::uint16_t AckBegin() const noexcept { return ack; }
+		std::uint16_t AckEnd() const noexcept { return ack + std::uint16_t(33); }
 	};
 
 	struct Header {
diff --git a/src/net/net.cpp b/src/net/net.cpp
index 837a7fb..1876157 100644
--- a/src/net/net.cpp
+++ b/src/net/net.cpp
@@ -271,10 +271,23 @@ void Connection::Received(const UDPpacket &udp_pack) {
 				}
 			}
 		}
+		// check for newly ack'd packets
+		for (uint16_t s = ctrl_new.AckBegin(); s != ctrl_new.AckEnd(); ++s) {
+			if (ctrl_new.Acks(s) && !ctrl_in.Acks(s)) {
+				Handler().OnPacketReceived(s);
+			}
+		}
 		ctrl_in = ctrl_new;
 	}
 }
 
+bool Packet::TControl::Acks(uint16_t s) const noexcept {
+	int16_t diff = int16_t(ack) - int16_t(s);
+	if (diff == 0) return true;
+	if (diff < 0 || diff > 32) return false;
+	return (hist & (1 << (diff - 1))) != 0;
+}
+
 uint16_t Connection::SendPing(UDPpacket &udp_pack, UDPsocket sock) {
 	Packet::Make<Packet::Ping>(udp_pack);
 	return Send(udp_pack, sock);