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Rewrote the entity movement packets to use full 16-bit signed short increasing the entity ID limit from 2048 (artifical lce limit) to 32768 ids (0 to 32767)

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This commit is contained in:
MathiewMay
2026-03-09 21:45:08 -04:00
parent 9c254bbf4d
commit dac0e883b6
4 changed files with 94 additions and 162 deletions
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106
Minecraft.World/Network/Packets/MoveEntityPacketSmall.cpp
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@@ -19,30 +19,19 @@ MoveEntityPacketSmall::MoveEntityPacketSmall()
MoveEntityPacketSmall::MoveEntityPacketSmall(int id)
{
if( (id < 0 ) || (id >= 2048 ) )
{
// We shouln't be tracking an entity that doesn't have a short type of id
__debugbreak();
}
this->id = id;
hasRot = false;
xa = 0;
ya = 0;
za = 0;
yRot = 0;
xRot = 0;
xa = ya = za = yRot = xRot = 0;
}
void MoveEntityPacketSmall::read(DataInputStream *dis) //throws IOException
void MoveEntityPacketSmall::read(DataInputStream *dis) //throws IOException
{
id = dis->readShort();
}
void MoveEntityPacketSmall::write(DataOutputStream *dos) //throws IOException
{
if( (id < 0 ) || (id >= 2048 ) )
if(id < 0 || id > 32767 )
{
// We shouln't be tracking an entity that doesn't have a short type of id
__debugbreak();
@@ -55,7 +44,7 @@ void MoveEntityPacketSmall::handle(PacketListener *listener)
listener->handleMoveEntitySmall(shared_from_this());
}
int MoveEntityPacketSmall::getEstimatedSize()
int MoveEntityPacketSmall::getEstimatedSize()
{
return 2;
}
@@ -86,36 +75,32 @@ MoveEntityPacketSmall::PosRot::PosRot(int id, char xa, char ya, char za, char yR
hasRot = true;
}
void MoveEntityPacketSmall::PosRot::read(DataInputStream *dis) //throws IOException
void MoveEntityPacketSmall::PosRot::read(DataInputStream *dis) //throws IOException
{
int idAndRot = dis->readShort();
this->id = idAndRot & 0x07ff;
this->yRot = idAndRot >> 11;
int xAndYAndZ = (int)dis->readShort();
this->xa = xAndYAndZ >> 11;
this->ya = (xAndYAndZ << 21 ) >> 26;
this->za = (xAndYAndZ << 27 ) >> 27;
MoveEntityPacketSmall::read(dis);
xa = (signed char)dis->readByte();
ya = (signed char)dis->readByte();
za = (signed char)dis->readByte();
yRot = (signed char)dis->readByte();
xRot = (signed char)dis->readByte();
}
void MoveEntityPacketSmall::PosRot::write(DataOutputStream *dos) //throws IOException
void MoveEntityPacketSmall::PosRot::write(DataOutputStream *dos) //throws IOException
{
if( (id < 0 ) || (id >= 2048 ) )
{
// We shouln't be tracking an entity that doesn't have a short type of id
__debugbreak();
}
short idAndRot = id | yRot << 11;
dos->writeShort(idAndRot);
short xAndYAndZ = ( xa << 11 ) | ( ( ya & 0x3f ) << 5 ) | ( za & 0x1f );
dos->writeShort(xAndYAndZ);
MoveEntityPacketSmall::write(dos);
dos->writeByte((uint8_t)(xa & 0xFF));
dos->writeByte((uint8_t)(ya & 0xFF));
dos->writeByte((uint8_t)(za & 0xFF));
dos->writeByte((uint8_t)(yRot & 0xFF));
dos->writeByte((uint8_t)(xRot & 0xFF));
}
int MoveEntityPacketSmall::PosRot::getEstimatedSize()
int MoveEntityPacketSmall::PosRot::getEstimatedSize()
{
return 4;
return 2+5;
}
MoveEntityPacketSmall::Pos::Pos()
MoveEntityPacketSmall::Pos::Pos()
{
}
@@ -126,35 +111,28 @@ MoveEntityPacketSmall::Pos::Pos(int id, char xa, char ya, char za) : MoveEntityP
this->za = za;
}
void MoveEntityPacketSmall::Pos::read(DataInputStream *dis) //throws IOException
void MoveEntityPacketSmall::Pos::read(DataInputStream *dis) //throws IOException
{
int idAndY = dis->readShort();
this->id = idAndY & 0x07ff;
this->ya = idAndY >> 11;
int XandZ = (int)((signed char)(dis->readByte()));
xa = XandZ >> 4;
za = ( XandZ << 28 ) >> 28;
MoveEntityPacketSmall::read(dis);
xa = (signed char)dis->readByte();
ya = (signed char)dis->readByte();
za = (signed char)dis->readByte();
}
void MoveEntityPacketSmall::Pos::write(DataOutputStream *dos) //throws IOException
{
if( (id < 0 ) || (id >= 2048 ) )
{
// We shouln't be tracking an entity that doesn't have a short type of id
__debugbreak();
}
short idAndY = id | ya << 11;
dos->writeShort(idAndY);
char XandZ = ( xa << 4 ) | ( za & 0x0f );
dos->writeByte((uint8_t)XandZ);
MoveEntityPacketSmall::write(dos);
dos->writeByte((uint8_t)(xa & 0xFF));
dos->writeByte((uint8_t)(ya & 0xFF));
dos->writeByte((uint8_t)(za & 0xFF));
}
int MoveEntityPacketSmall::Pos::getEstimatedSize()
{
return 3;
return 2+3;
}
MoveEntityPacketSmall::Rot::Rot()
MoveEntityPacketSmall::Rot::Rot()
{
hasRot = true;
}
@@ -167,25 +145,19 @@ MoveEntityPacketSmall::Rot::Rot(int id, char yRot, char xRot) : MoveEntityPacket
hasRot = true;
}
void MoveEntityPacketSmall::Rot::read(DataInputStream *dis) //throws IOException
void MoveEntityPacketSmall::Rot::read(DataInputStream *dis) //throws IOException
{
int idAndRot = (int)dis->readShort();
this->id = idAndRot & 0x07ff;
this->yRot = idAndRot >> 11;
MoveEntityPacketSmall::read(dis);
yRot = (signed char)dis->readByte();
}
void MoveEntityPacketSmall::Rot::write(DataOutputStream *dos) //throws IOException
void MoveEntityPacketSmall::Rot::write(DataOutputStream *dos) //throws IOException
{
if( (id < 0 ) || (id >= 2048 ) )
{
// We shouln't be tracking an entity that doesn't have a short type of id
__debugbreak();
}
short idAndRot = id | yRot << 11;
dos->writeShort(idAndRot);
MoveEntityPacketSmall::write(dos);
dos->writeByte((uint8_t)(yRot & 0xFF));
}
int MoveEntityPacketSmall::Rot::getEstimatedSize()
{
return 2;
return 2+1;
}