first commit

Minecraft.World/TileUpdatePacket.cpp

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+#include "stdafx.h"
+#include <iostream>
+#include "InputOutputStream.h"
+#include "net.minecraft.world.level.h"
+#include "PacketListener.h"
+#include "TileUpdatePacket.h"
+#include "Dimension.h"
+
+
+
+TileUpdatePacket::TileUpdatePacket() 
+{
+	shouldDelay = true;
+}
+
+TileUpdatePacket::TileUpdatePacket(int x, int y, int z, Level *level)
+{
+	shouldDelay = true;
+	this->x = x;
+	this->y = y;
+	this->z = z;
+	block = level->getTile(x, y, z);
+	data = level->getData(x, y, z);
+	levelIdx = ( ( level->dimension->id == 0 ) ? 0 : ( (level->dimension->id == -1) ? 1 : 2 ) );
+}
+
+void TileUpdatePacket::read(DataInputStream *dis) //throws IOException 
+{
+#ifdef _LARGE_WORLDS
+	x = dis->readInt();
+	y = dis->read();
+	z = dis->readInt();
+	
+	block = (int)dis->readShort() & 0xffff;
+
+	BYTE dataLevel = dis->readByte();
+	data = dataLevel & 0xf;
+	levelIdx = (dataLevel>>4) & 0xf;
+#else
+	// 4J - See comments in write for packing
+	int xyzdata = dis->readInt();
+	x = ( xyzdata >> 22 ) & 0x3ff;
+	y = ( xyzdata >> 14 ) & 0xff;
+	z = ( xyzdata >> 4 ) & 0x3ff;
+	x = ( x << 22 ) >> 22;
+	z = ( z << 22 ) >> 22;
+	data = xyzdata & 0xf;
+	block = (int)dis->readShort() & 0xffff;
+	//levelIdx = ( xyzdata >> 31 ) & 1;
+
+	// Can't pack this as it's now 2 bits
+	levelIdx = (int)dis->readByte();
+#endif
+}
+
+void TileUpdatePacket::write(DataOutputStream *dos) //throws IOException
+{
+#ifdef _LARGE_WORLDS
+	dos->writeInt(x);
+	dos->write(y);
+	dos->writeInt(z);
+	dos->writeShort(block);
+
+	BYTE dataLevel = ((levelIdx & 0xf ) << 4) | (data & 0xf);
+	dos->writeByte(dataLevel);
+#else
+	// 4J - for our fixed size map, we can pack x & z into 10 bits each (-512 -> 511), y into 8 bits (0 to 255)
+	// block type could really be 7 bits but leaving that as 8 for future ease of expansion. Data only needs to be 4-bits as that is how it 
+	// is ultimately stored
+	int xyzdata = ( ( x & 0x3ff ) << 22 ) | ( ( y & 0xff ) << 14 ) | ( ( z & 0x3ff ) << 4 ) | ( data & 0xf);
+	//xyzdata |= levelIdx << 31;
+	dos->writeInt(xyzdata);
+	dos->writeShort(block);
+
+	// Can't pack this as it's now 2 bits
+	dos->write(levelIdx);
+#endif
+}
+
+void TileUpdatePacket::handle(PacketListener *listener) 
+{
+	listener->handleTileUpdate(shared_from_this());
+}
+
+int TileUpdatePacket::getEstimatedSize() 
+{
+#ifdef _LARGE_WORLDS
+	return 12;
+#else
+	return 5;
+#endif
+}