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authorTiger Wang <ziwei.tiger@outlook.com>2020-07-19 17:21:05 +0200
committerTiger Wang <ziwei.tiger@outlook.com>2020-07-19 17:21:05 +0200
commitbedddfffbccb4eca2b09e15dee4a7928378291ac (patch)
treee340b230ac39b21bd345433b71eeca1588b4439f /src/Protocol
parent1.13.1, 1.13.2 connection support (diff)
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Diffstat (limited to '')
-rw-r--r--src/Protocol/Protocol_1_8.cpp118
1 files changed, 76 insertions, 42 deletions
diff --git a/src/Protocol/Protocol_1_8.cpp b/src/Protocol/Protocol_1_8.cpp
index 6cfe370cd..eb277c5b4 100644
--- a/src/Protocol/Protocol_1_8.cpp
+++ b/src/Protocol/Protocol_1_8.cpp
@@ -87,6 +87,7 @@ Implements the 1.8 protocol classes:
const int MAX_ENC_LEN = 512; // Maximum size of the encrypted message; should be 128, but who knows...
const uLongf MAX_COMPRESSED_PACKET_LEN = 200 KiB; // Maximum size of compressed packets.
+static const UInt32 CompressionThreshold = 256; // After how large a packet should we compress it.
@@ -328,16 +329,12 @@ void cProtocol_1_8_0::SendChatRaw(const AString & a_MessageRaw, eChatType a_Type
-void cProtocol_1_8_0::SendChunkData(int a_ChunkX, int a_ChunkZ, cChunkDataSerializer & a_Serializer)
+void cProtocol_1_8_0::SendChunkData(const std::string_view a_ChunkData)
{
ASSERT(m_State == 3); // In game mode?
- // Serialize first, before creating the Packetizer (the packetizer locks a CS)
- // This contains the flags and bitmasks, too
- const AString & ChunkData = a_Serializer.Serialize(cChunkDataSerializer::RELEASE_1_8_0, a_ChunkX, a_ChunkZ);
-
cCSLock Lock(m_CSPacket);
- SendData(ChunkData.data(), ChunkData.size());
+ SendData(a_ChunkData.data(), a_ChunkData.size());
}
@@ -805,7 +802,7 @@ void cProtocol_1_8_0::SendLoginSuccess(void)
// Enable compression:
{
cPacketizer Pkt(*this, pktStartCompression);
- Pkt.WriteVarInt32(256);
+ Pkt.WriteVarInt32(CompressionThreshold);
}
m_State = 3; // State = Game
@@ -1712,6 +1709,52 @@ void cProtocol_1_8_0::SendWindowProperty(const cWindow & a_Window, short a_Prope
bool cProtocol_1_8_0::CompressPacket(const AString & a_Packet, AString & a_CompressedData)
{
+ const auto UncompressedSize = static_cast<size_t>(a_Packet.size());
+
+ if (UncompressedSize < CompressionThreshold)
+ {
+ /* Size doesn't reach threshold, not worth compressing.
+
+ --------------- Packet format ----------------
+ |--- Header ---------------------------------|
+ | PacketSize: Size of all fields below |
+ | DataSize: Zero, means below not compressed |
+ |--- Body -----------------------------------|
+ | a_Packet: copy of uncompressed data |
+ ----------------------------------------------
+ */
+ const UInt32 DataSize = 0;
+ const auto PacketSize = cByteBuffer::GetVarIntSize(DataSize) + UncompressedSize;
+
+ cByteBuffer LengthHeaderBuffer(
+ cByteBuffer::GetVarIntSize(PacketSize) +
+ cByteBuffer::GetVarIntSize(DataSize)
+ );
+
+ LengthHeaderBuffer.WriteVarInt32(PacketSize);
+ LengthHeaderBuffer.WriteVarInt32(DataSize);
+
+ AString LengthData;
+ LengthHeaderBuffer.ReadAll(LengthData);
+
+ a_CompressedData.reserve(LengthData.size() + UncompressedSize);
+ a_CompressedData.append(LengthData.data(), LengthData.size());
+ a_CompressedData.append(a_Packet);
+
+ return true;
+ }
+
+ /* Definitely worth compressing.
+
+ --------------- Packet format ----------------
+ |--- Header ---------------------------------|
+ | PacketSize: Size of all fields below |
+ | DataSize: Size of uncompressed a_Packet |
+ |--- Body -----------------------------------|
+ | CompressedData: compressed a_Packet |
+ ----------------------------------------------
+ */
+
// Compress the data:
char CompressedData[MAX_COMPRESSED_PACKET_LEN];
@@ -1722,30 +1765,34 @@ bool cProtocol_1_8_0::CompressPacket(const AString & a_Packet, AString & a_Compr
return false;
}
- int Status = compress2(
- reinterpret_cast<Bytef *>(CompressedData), &CompressedSize,
- reinterpret_cast<const Bytef *>(a_Packet.data()), static_cast<uLongf>(a_Packet.size()), Z_DEFAULT_COMPRESSION
- );
- if (Status != Z_OK)
+ if (
+ compress2(
+ reinterpret_cast<Bytef *>(CompressedData), &CompressedSize,
+ reinterpret_cast<const Bytef *>(a_Packet.data()), static_cast<uLongf>(a_Packet.size()), Z_DEFAULT_COMPRESSION
+ ) != Z_OK
+ )
{
return false;
}
+ const UInt32 DataSize = UncompressedSize;
+ const auto PacketSize = cByteBuffer::GetVarIntSize(DataSize) + CompressedSize;
+
+ cByteBuffer LengthHeaderBuffer(
+ cByteBuffer::GetVarIntSize(PacketSize) +
+ cByteBuffer::GetVarIntSize(DataSize)
+ );
+
+ LengthHeaderBuffer.WriteVarInt32(PacketSize);
+ LengthHeaderBuffer.WriteVarInt32(DataSize);
+
AString LengthData;
- cByteBuffer Buffer(20);
- Buffer.WriteVarInt32(static_cast<UInt32>(a_Packet.size()));
- Buffer.ReadAll(LengthData);
- Buffer.CommitRead();
-
- Buffer.WriteVarInt32(static_cast<UInt32>(CompressedSize + LengthData.size()));
- Buffer.WriteVarInt32(static_cast<UInt32>(a_Packet.size()));
- Buffer.ReadAll(LengthData);
- Buffer.CommitRead();
-
- a_CompressedData.clear();
- a_CompressedData.reserve(LengthData.size() + CompressedSize);
+ LengthHeaderBuffer.ReadAll(LengthData);
+
+ a_CompressedData.reserve(LengthData.size() + DataSize);
a_CompressedData.append(LengthData.data(), LengthData.size());
a_CompressedData.append(CompressedData, CompressedSize);
+
return true;
}
@@ -3150,22 +3197,16 @@ void cProtocol_1_8_0::SendPacket(cPacketizer & a_Pkt)
m_OutPacketBuffer.ReadAll(PacketData);
m_OutPacketBuffer.CommitRead();
- if ((m_State == 3) && (PacketLen >= 256))
+ if (m_State == 3)
{
// Compress the packet payload:
if (!cProtocol_1_8_0::CompressPacket(PacketData, CompressedPacket))
{
return;
}
- }
- else if (m_State == 3)
- {
- // The packet is not compressed, indicate this in the packet header:
- m_OutPacketLenBuffer.WriteVarInt32(PacketLen + 1);
- m_OutPacketLenBuffer.WriteVarInt32(0);
- AString LengthData;
- m_OutPacketLenBuffer.ReadAll(LengthData);
- SendData(LengthData.data(), LengthData.size());
+
+ // Send the packet's payload compressed:
+ SendData(CompressedPacket.data(), CompressedPacket.size());
}
else
{
@@ -3174,18 +3215,11 @@ void cProtocol_1_8_0::SendPacket(cPacketizer & a_Pkt)
AString LengthData;
m_OutPacketLenBuffer.ReadAll(LengthData);
SendData(LengthData.data(), LengthData.size());
- }
- // Send the packet's payload, either direct or compressed:
- if (CompressedPacket.empty())
- {
+ // Send the packet's payload directly:
m_OutPacketLenBuffer.CommitRead();
SendData(PacketData.data(), PacketData.size());
}
- else
- {
- SendData(CompressedPacket.data(), CompressedPacket.size());
- }
// Log the comm into logfile:
if (g_ShouldLogCommOut && m_CommLogFile.IsOpen())