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// Packetizer.h
// Declares the cPacketizer class representing a wrapper for sending a single packet over a protocol.
// The class provides auto-locking, serialization and send-on-instance-destroy semantics
#pragma once
#include "Protocol.h"
class cByteBuffer;
// fwd:
class cUUID;
/** Macros used to read packets more easily */
#define HANDLE_READ(ByteBuf, Proc, Type, Var) \
Type Var; \
do \
{ \
if (!ByteBuf.Proc(Var)) \
{ \
return; \
} \
} \
while (false)
#define HANDLE_PACKET_READ(ByteBuf, Proc, Type, Var) \
Type Var; \
do \
{ \
{ \
if (!ByteBuf.Proc(Var)) \
{ \
ByteBuf.CheckValid(); \
return false; \
} \
ByteBuf.CheckValid(); \
} \
} \
while (false)
/** Composes an individual packet in the protocol's m_OutPacketBuffer; sends it just before being destructed. */
class cPacketizer
{
public:
/** Starts serializing a new packet into the protocol's m_OutPacketBuffer.
Locks the protocol's m_CSPacket to avoid multithreading issues. */
cPacketizer(cProtocol & a_Protocol, cProtocol::ePacketType a_PacketType) :
m_Protocol(a_Protocol),
m_Out(a_Protocol.m_OutPacketBuffer),
m_Lock(a_Protocol.m_CSPacket),
m_PacketType(a_PacketType) // Used for logging purposes
{
m_Out.WriteVarInt32(m_Protocol.GetPacketID(a_PacketType));
}
/** Sends the packet via the contained protocol's SendPacket() function. */
~cPacketizer();
inline void WriteBool(bool a_Value) { VERIFY(m_Out.WriteBool(a_Value)); }
inline void WriteBEUInt8(UInt8 a_Value) { VERIFY(m_Out.WriteBEUInt8(a_Value)); }
inline void WriteBEInt8(Int8 a_Value) { VERIFY(m_Out.WriteBEInt8(a_Value)); }
inline void WriteBEInt16(Int16 a_Value) { VERIFY(m_Out.WriteBEInt16(a_Value)); }
inline void WriteBEUInt16(UInt16 a_Value) { VERIFY(m_Out.WriteBEUInt16(a_Value)); }
inline void WriteBEInt32(Int32 a_Value) { VERIFY(m_Out.WriteBEInt32(a_Value)); }
inline void WriteBEUInt32(UInt32 a_Value) { VERIFY(m_Out.WriteBEUInt32(a_Value)); }
inline void WriteBEInt64(Int64 a_Value) { VERIFY(m_Out.WriteBEInt64(a_Value)); }
inline void WriteBEUInt64(UInt64 a_Value) { VERIFY(m_Out.WriteBEUInt64(a_Value)); }
inline void WriteBEFloat(float a_Value) { VERIFY(m_Out.WriteBEFloat(a_Value)); }
inline void WriteBEDouble(double a_Value) { VERIFY(m_Out.WriteBEDouble(a_Value)); }
inline void WriteVarInt32(UInt32 a_Value) { VERIFY(m_Out.WriteVarInt32(a_Value)); }
inline void WriteString(const AString & a_Value) { VERIFY(m_Out.WriteVarUTF8String(a_Value)); }
inline void WriteBuf(const ContiguousByteBufferView a_Data) { VERIFY(m_Out.Write(a_Data.data(), a_Data.size())); }
/** Writes the specified block position as a single encoded 64-bit BigEndian integer.
The three coordinates are written in XYZ order. */
inline void WriteXYZPosition64(int a_BlockX, int a_BlockY, int a_BlockZ)
{
VERIFY(m_Out.WriteXYZPosition64(a_BlockX, a_BlockY, a_BlockZ));
}
/** Writes the specified block position as a single encoded 64-bit BigEndian integer.
The three coordinates are written in XYZ order. */
inline void WriteXYZPosition64(const Vector3i a_Position)
{
VERIFY(m_Out.WriteXYZPosition64(a_Position.x, a_Position.y, a_Position.z));
}
/** Writes the specified block position as a single encoded 64-bit BigEndian integer.
The three coordinates are written in XZY order, in 1.14+. */
inline void WriteXZYPosition64(int a_BlockX, int a_BlockY, int a_BlockZ)
{
VERIFY(m_Out.WriteXZYPosition64(a_BlockX, a_BlockY, a_BlockZ));
}
/** Writes the specified block position as a single encoded 64-bit BigEndian integer.
The three coordinates are written in XZY order, in 1.14+. */
inline void WriteXZYPosition64(const Vector3i a_Position)
{
VERIFY(m_Out.WriteXZYPosition64(a_Position.x, a_Position.y, a_Position.z));
}
/** Writes the specified angle using a single byte. */
void WriteByteAngle(double a_Angle);
/** Writes the double value as a 27:5 fixed-point integer. */
void WriteFPInt(double a_Value);
/** Writes the specified UUID as a 128-bit BigEndian integer. */
void WriteUUID(const cUUID & a_UUID);
cProtocol::ePacketType GetPacketType() const { return m_PacketType; }
/** Returns the human-readable representation of the packet type.
Used for logging the packets. */
static AString PacketTypeToStr(cProtocol::ePacketType a_PacketType);
protected:
/** The protocol instance in which the packet is being constructed. */
cProtocol & m_Protocol;
/** The protocol's buffer for the constructed packet data. */
cByteBuffer & m_Out;
/** The RAII lock preventing multithreaded access to the protocol buffer while constructing the packet. */
cCSLock m_Lock;
/** Type of the contained packet.
Used for logging purposes, the packet type is encoded into m_Out immediately in constructor. */
cProtocol::ePacketType m_PacketType;
};
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