From: Perttu Ahola <celeron55@gmail.com>
Date: Sat, 21 May 2011 09:25:08 +0000 (+0300)
Subject: Cleaned networking code a bit (had this one on the to-do list for like 4 months already)
X-Git-Tag: 0.2.20110731_3~187
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=fe02a19f1795429c110e6c7ed76d333cb42a3072;p=oweals%2Fminetest.git

Cleaned networking code a bit (had this one on the to-do list for like 4 months already)
---

diff --git a/src/connection.cpp b/src/connection.cpp
index b07e0de90..548a7f532 100644
--- a/src/connection.cpp
+++ b/src/connection.cpp
@@ -320,7 +320,7 @@ IncomingSplitBuffer::~IncomingSplitBuffer()
 	This will throw a GotSplitPacketException when a full
 	split packet is constructed.
 */
-void IncomingSplitBuffer::insert(BufferedPacket &p, bool reliable)
+SharedBuffer<u8> IncomingSplitBuffer::insert(BufferedPacket &p, bool reliable)
 {
 	u32 headersize = BASE_HEADER_SIZE + 7;
 	assert(p.data.getSize() >= headersize);
@@ -363,9 +363,9 @@ void IncomingSplitBuffer::insert(BufferedPacket &p, bool reliable)
 	// Set chunk data in buffer
 	sp->chunks[chunk_num] = chunkdata;
 	
-	// If not all chunks are received, return
+	// If not all chunks are received, return empty buffer
 	if(sp->allReceived() == false)
-		return;
+		return SharedBuffer<u8>();
 
 	// Calculate total size
 	u32 totalsize = 0;
@@ -392,8 +392,8 @@ void IncomingSplitBuffer::insert(BufferedPacket &p, bool reliable)
 	// Remove sp from buffer
 	m_buf.remove(seqnum);
 	delete sp;
-	
-	throw GotSplitPacketException(fulldata);
+
+	return fulldata;
 }
 void IncomingSplitBuffer::removeUnreliableTimedOuts(float dtime, float timeout)
 {
@@ -709,21 +709,17 @@ SharedBuffer<u8> Channel::ProcessPacket(
 				con->GetProtocolID(),
 				peer_id,
 				channelnum);
-		try{
-			// Buffer the packet
-			incoming_splits.insert(packet, reliable);
-		}
-		// This exception happens when all the pieces of a packet
-		// are collected.
-		catch(GotSplitPacketException &e)
+		// Buffer the packet
+		SharedBuffer<u8> data = incoming_splits.insert(packet, reliable);
+		if(data.getSize() != 0)
 		{
 			con->PrintInfo();
 			dout_con<<"RETURNING TYPE_SPLIT: Constructed full data, "
-					<<"size="<<e.getData().getSize()<<std::endl;
-			return e.getData();
+					<<"size="<<data.getSize()<<std::endl;
+			return data;
 		}
 		con->PrintInfo();
-		dout_con<<"BUFFERING TYPE_SPLIT"<<std::endl;
+		dout_con<<"BUFFERED TYPE_SPLIT"<<std::endl;
 		throw ProcessedSilentlyException("Buffered a split packet chunk");
 	}
 	else if(type == TYPE_RELIABLE)
diff --git a/src/connection.h b/src/connection.h
index 0b5d5e230..6eb2f2824 100644
--- a/src/connection.h
+++ b/src/connection.h
@@ -99,19 +99,6 @@ public:
 	{}
 };
 
-class GotSplitPacketException
-{
-	SharedBuffer<u8> m_data;
-public:
-	GotSplitPacketException(SharedBuffer<u8> data):
-		m_data(data)
-	{}
-	SharedBuffer<u8> getData()
-	{
-		return m_data;
-	}
-};
-
 inline u16 readPeerId(u8 *packetdata)
 {
 	return readU16(&packetdata[4]);
@@ -314,10 +301,10 @@ class IncomingSplitBuffer
 public:
 	~IncomingSplitBuffer();
 	/*
-		This will throw a GotSplitPacketException when a full
-		split packet is constructed.
+		Returns a reference counted buffer of length != 0 when a full split
+		packet is constructed. If not, returns one of length 0.
 	*/
-	void insert(BufferedPacket &p, bool reliable);
+	SharedBuffer<u8> insert(BufferedPacket &p, bool reliable);
 	
 	void removeUnreliableTimedOuts(float dtime, float timeout);
 	
diff --git a/src/main.cpp b/src/main.cpp
index 7b33bdb84..202c5e75e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -81,6 +81,8 @@ SUGG: Calculate lighting per vertex to get a lighting effect like in
 SUGG: Background music based on cellular automata?
       http://www.earslap.com/projectslab/otomata
 
+SUGG: Simple light color information to air
+
 Gaming ideas:
 -------------
 
@@ -135,8 +137,6 @@ Build system / running:
 Networking and serialization:
 -----------------------------
 
-TODO: Get rid of GotSplitPacketException
-
 User Interface:
 ---------------
 
@@ -164,11 +164,6 @@ TODO: A setting for enabling bilinear filtering for textures
 
 TODO: Better control of draw_control.wanted_max_blocks
 
-TODO: Get player texture (and some others) from the specified texture
-      directory
-
-SUGG: Simple light color information to air
-
 TODO: Block mesh generator to tile properly on smooth lighting
 
 Configuration:
diff --git a/src/utility.h b/src/utility.h
index cc8891a07..0df43a31b 100644
--- a/src/utility.h
+++ b/src/utility.h
@@ -371,10 +371,20 @@ template <typename T>
 class SharedBuffer
 {
 public:
+	SharedBuffer()
+	{
+		m_size = 0;
+		data = NULL;
+		refcount = new unsigned int;
+		(*refcount) = 1;
+	}
 	SharedBuffer(unsigned int size)
 	{
 		m_size = size;
-		data = new T[size];
+		if(m_size != 0)
+			data = new T[m_size];
+		else
+			data = NULL;
 		refcount = new unsigned int;
 		(*refcount) = 1;
 	}
@@ -404,8 +414,13 @@ public:
 	SharedBuffer(T *t, unsigned int size)
 	{
 		m_size = size;
-		data = new T[size];
-		memcpy(data, t, size);
+		if(m_size != 0)
+		{
+			data = new T[m_size];
+			memcpy(data, t, m_size);
+		}
+		else
+			data = NULL;
 		refcount = new unsigned int;
 		(*refcount) = 1;
 	}
@@ -414,9 +429,14 @@ public:
 	*/
 	SharedBuffer(const Buffer<T> &buffer)
 	{
-		m_size = buffer.m_size;
-		data = new T[buffer.getSize()];
-		memcpy(data, *buffer, buffer.getSize());
+		m_size = buffer.getSize();
+		if(m_size != 0)
+		{
+			data = new T[m_size];
+			memcpy(data, *buffer, buffer.getSize());
+		}
+		else
+			data = NULL;
 		refcount = new unsigned int;
 		(*refcount) = 1;
 	}
@@ -426,6 +446,7 @@ public:
 	}
 	T & operator[](unsigned int i) const
 	{
+		//assert(i < m_size)
 		return data[i];
 	}
 	T * operator*() const
@@ -443,7 +464,8 @@ private:
 		(*refcount)--;
 		if(*refcount == 0)
 		{
-			delete[] data;
+			if(data)
+				delete[] data;
 			delete refcount;
 		}
 	}