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#include "stdafx.h"
#include <iostream>
#include "InputOutputStream.h"
#include "net.minecraft.world.level.h"
#include "net.minecraft.world.level.chunk.h"
#include "PacketListener.h"
#include "ChunkTilesUpdatePacket.h"
#include "Dimension.h"
ChunkTilesUpdatePacket::~ChunkTilesUpdatePacket()
{
delete [] blocks.data;
delete [] data.data;
delete [] positions.data;
}
ChunkTilesUpdatePacket::ChunkTilesUpdatePacket()
{
shouldDelay = true;
xc = 0;
zc = 0;
count = 0;
}
ChunkTilesUpdatePacket::ChunkTilesUpdatePacket(int xc, int zc, shortArray positions, byte count, Level *level)
{
shouldDelay = true;
this->xc = xc;
this->zc = zc;
this->count = count;
this->positions = shortArray(count);
this->blocks = byteArray(count);
this->data = byteArray(count);
LevelChunk *levelChunk = level->getChunk(xc, zc);
for (int i = 0; i < count; i++)
{
int x = (positions[i] >> 12) & 15;
int z = (positions[i] >> 8) & 15;
int y = (positions[i]) & 255;
this->positions[i] = positions[i];
blocks[i] = static_cast<byte>(levelChunk->getTile(x, y, z));
data[i] = static_cast<byte>(levelChunk->getData(x, y, z));
}
levelIdx = ( ( level->dimension->id == 0 ) ? 0 : ( (level->dimension->id == -1) ? 1 : 2 ) );
}
void ChunkTilesUpdatePacket::read(DataInputStream *dis) //throws IOException
{
// 4J - changed format. See comments in write method.
#ifdef _LARGE_WORLDS
xc = dis->readShort();
zc = dis->readShort();
xc = ( xc << 16 ) >> 16;
zc = ( zc << 16 ) >> 16;
#else
xc = dis->read();
zc = dis->read();
xc = ( xc << 24 ) >> 24;
zc = ( zc << 24 ) >> 24;
#endif
int countAndFlags = dis->readByte();
bool dataAllZero = (( countAndFlags & 0x80 ) == 0x80 );
levelIdx = ( countAndFlags >> 5 ) & 3;
count = countAndFlags & 0x1f;
positions = shortArray(count);
blocks = byteArray(count);
data = byteArray(count);
int currentBlockType = -1;
for( int i = 0; i < count; i++ )
{
int xzAndFlag = dis->readShort();
int y = dis->readByte();
positions[i] = (xzAndFlag & 0xff00) | (y & 0xff);
if( ( xzAndFlag & 0x0080 ) == 0x0080 )
{
currentBlockType = dis->read();
}
blocks[i] = currentBlockType;
if( !dataAllZero)
{
data[i] = dis->read();
}
else
{
data[i] = 0;
}
}
}
void ChunkTilesUpdatePacket::write(DataOutputStream *dos) //throws IOException
{
// 4J - changed format to reduce size of these packets.
#ifdef _LARGE_WORLDS
dos->writeShort(xc);
dos->writeShort(zc);
#else
dos->write(xc);
dos->write(zc);
#endif
// Determine if we've got any data elements that are non-zero - a large % of these packets set all data to zero, so we don't
// bother sending all those zeros in that case.
bool dataAllZero = true;
for( int i = 0; i < count; i++ )
{
if( data[i] ) dataAllZero = false;
}
int countAndFlags = count;
if( dataAllZero ) countAndFlags |= 0x80;
countAndFlags |= ( levelIdx << 5 );
dos->write(countAndFlags);
int lastBlockType = -1;
// Each block is represented by 15 bits of position, a flag to say whether the current block type is to change, and a possible data value.
// A large % of these packets set the same block type to a several positions, so no point resending the block type when not necessary.
for( int i = 0; i < count; i++ )
{
int xzAndFlag = positions[i] &0xff00;
int y = positions[i] & 0xff;
int thisBlockType = blocks[i];
if( thisBlockType != lastBlockType )
{
xzAndFlag |= 0x0080; // Use top bit of y as a flag, we only need 7 bits for that
dos->writeShort(xzAndFlag);
dos->write(y);
dos->write(thisBlockType);
lastBlockType = thisBlockType;
}
else
{
dos->writeShort(xzAndFlag);
dos->write(y);
}
if( !dataAllZero )
{
dos->write(data[i]);
}
}
}
void ChunkTilesUpdatePacket::handle(PacketListener *listener)
{
listener->handleChunkTilesUpdate(shared_from_this());
}
int ChunkTilesUpdatePacket::getEstimatedSize()
{
bool dataAllZero = true;
int lastBlockType = -1;
int blockTypeChanges = 0;
for( int i = 0; i < count; i++ )
{
if( data[i] ) dataAllZero = false;
int thisBlockType = blocks[i];
if( thisBlockType != lastBlockType )
{
blockTypeChanges++;
lastBlockType = thisBlockType;
}
}
int byteCount = 3 + 2 * count + blockTypeChanges;
if( !dataAllZero )
{
byteCount += count;
}
return byteCount;
}
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