Added initial netmsg handlers, need to confirm them with current demo protocol

demboyz/demboyz.cpp

@@ -1,6 +1,7 @@
 
 #include "demofile.h"
 #include "demofilebitbuf.h"
+#include "netmessages.h"
 #include <assert.h>
 #include <vector>
 #include <fstream>
@@ -11,18 +12,21 @@ void ParseGameEvent(const std::string& eventBuf)
 {
     CBitRead bitBuf(eventBuf.data(), eventBuf.size());
     uint32 eventId = bitBuf.ReadUBitLong(9);
-    printf("%s\n", eventNames[eventId-1].c_str());
+    printf("%s\n", eventNames[eventId].c_str());
 }
 
-void ParsePacket(const std::string& packetBuf)
+void ParsePacket(const char* packetBuf, const int numBytes)
 {
-    auto data = packetBuf.data();
+    assert(numBytes <= NET_MAX_PAYLOAD);
-    CBitRead bitBuf(packetBuf.data(), packetBuf.size());
+    CBitRead bitBuf(packetBuf, numBytes);
-    uint32 typeId = bitBuf.ReadUBitLong(5);
+    while (bitBuf.GetNumBitsLeft() >= NETMSG_TYPE_BITS)
+    {
+        uint32 typeId = bitBuf.ReadUBitLong(NETMSG_TYPE_BITS);
         printf("%i\n", typeId);
-    if (typeId != 25)
+        ProcessNetMsg(typeId, bitBuf);
+        /*if (typeId != 25)
         {
-        return;
+            break;
         }
 
         uint32 length = bitBuf.ReadUBitLong(11);
@@ -32,7 +36,8 @@ void ParsePacket(const std::string& packetBuf)
         subpacket.resize(numBytes);
 
         bitBuf.ReadBits(&subpacket[0], length);
-    ParseGameEvent(subpacket);
+        ParseGameEvent(subpacket);*/
+    }
 }
 
 void ParseEventNames(const char* eventfile, std::vector<std::string>& eventNames)
@@ -45,6 +50,24 @@ void ParseEventNames(const char* eventfile, std::vector<std::string>& eventNames
     }
 }
 
+void ParseSignonData(const std::string& signonData)
+{
+    CBitRead bitbuf(signonData.data(), signonData.length());
+    const char cmd = bitbuf.ReadChar();
+    assert(cmd == dem_signon);
+    const int32 tick = bitbuf.ReadLong();
+    bitbuf.SeekRelative(sizeof(democmdinfo_t) * 8);
+    const int32 seq1 = bitbuf.ReadLong();
+    const int32 seq2 = bitbuf.ReadLong();
+    assert(seq1 == seq2);
+
+    const int32 numBytes = bitbuf.ReadLong();
+    std::string packet;
+    packet.resize(numBytes);
+    bitbuf.ReadBytes(&packet[0], numBytes);
+    ParsePacket(packet.data(), numBytes);
+}
+
 int main(const int argc, const char* argv[])
 {
     if (argc < 3)
@@ -62,12 +85,14 @@ int main(const int argc, const char* argv[])
 
     auto demoHeader = demoFile.GetDemoHeader();
 
+    ParseSignonData(demoFile.GetSignOnData());
+
     unsigned char cmd;
     int32 tick;
     int32 sequenceInfo1;
     int32 sequenceInfo2;
     democmdinfo_t cmdInfo;
-    std::string packetBuf;
+    char* packetBuf = (char*)malloc(NET_MAX_PAYLOAD);
     demoFile.ReadCmdHeader(cmd, tick);
 
     assert(cmd == dem_synctick && tick == 0);
@@ -81,11 +106,13 @@ int main(const int argc, const char* argv[])
         switch (cmd)
         {
             case dem_packet:
+                {
                     demoFile.ReadCmdInfo(cmdInfo);
                     demoFile.ReadSequenceInfo(sequenceInfo1, sequenceInfo2);
                     assert(sequenceInfo1 == sequenceInfo2);
-                demoFile.ReadRawData(packetBuf);
+                    const int32 length = demoFile.ReadRawData(packetBuf, NET_MAX_PAYLOAD);
-                ParsePacket(packetBuf);
+                    ParsePacket(packetBuf, length);
+                }
                 break;
             case dem_stop:
                 assert(i == numFrames && tick == numTicks);
@@ -95,10 +122,12 @@ int main(const int argc, const char* argv[])
             case dem_usercmd:
             case dem_datatables:
             default:
+                assert(false);
                 break;
         }
     }
 
+    free(packetBuf);
     demoFile.Close();
 
     return 0;

demboyz/demofilebitbuf.h

@@ -233,6 +233,29 @@ public:
     int64 ReadSignedVarInt64() { return bitbuf::ZigZagDecode64( ReadVarInt64() ); }
 };
 
+inline unsigned int CBitRead::PeekUBitLong(int numbits)
+{
+    int nSaveBA = m_nBitsAvail;
+    int nSaveW = m_nInBufWord;
+    uint32 const *pSaveP = m_pDataIn;
+    unsigned int nRet = ReadUBitLong(numbits);
+    m_nBitsAvail = nSaveBA;
+    m_nInBufWord = nSaveW;
+    m_pDataIn = pSaveP;
+    return nRet;
+}
+
+inline int CBitRead::ReadLong(void)
+{
+    return (int)ReadUBitLong(sizeof(long) << 3);
+}
+
+inline float CBitRead::ReadFloat(void)
+{
+    uint32 nUval = ReadUBitLong(sizeof(long) << 3);
+    return *((float *)&nUval);
+}
+
 #ifndef MIN
 #define MIN( a, b ) ( ( ( a ) < ( b ) ) ? ( a ) : ( b ) )
 #endif

demboyz/netmessages.cpp

@@ -0,0 +1,414 @@
+
+#include "netmessages.h"
+#include "demofilebitbuf.h"
+#include <cassert>
+
+namespace math
+{
+    unsigned int log2(unsigned int value)
+    {
+        unsigned int res = 0;
+        while (value >>= 1)
+            ++res;
+        return res;
+    }
+
+    unsigned int Bits2Bytes(unsigned int bits)
+    {
+        return ((bits + 7) >> 3);
+    }
+}
+
+void Net_NOP(CBitRead& bitbuf)
+{
+    // nothing
+}
+
+void Net_Disconnect(CBitRead& bitbuf)
+{
+    char message[1024];
+    bitbuf.ReadString(message, sizeof(message));
+}
+
+void Net_File(CBitRead& bitbuf)
+{
+    const unsigned int transferID = bitbuf.ReadUBitLong(32);
+    char filename[1024];
+    bitbuf.ReadString(filename, sizeof(filename));
+    const bool isRequest = bitbuf.ReadOneBit() != 0;
+}
+
+void Net_Tick(CBitRead& bitbuf)
+{
+    static const float NET_TICK_SCALEUP = 100000.0f;
+
+    const int tick = bitbuf.ReadLong();
+    const float hostFrameTime = (float)bitbuf.ReadUBitLong(16) / NET_TICK_SCALEUP;
+    const float hostFrameTimeStdDev = (float)bitbuf.ReadUBitLong(16) / NET_TICK_SCALEUP;
+}
+
+void Net_StringCmd(CBitRead& bitbuf)
+{
+    char commandBuffer[1024];
+    bitbuf.ReadString(commandBuffer, sizeof(commandBuffer));
+}
+
+void Net_SetConVar(CBitRead& bitbuf)
+{
+    typedef struct cvar_s
+    {
+        char name[MAX_OSPATH];
+        char value[MAX_OSPATH];
+    } cvar_t;
+
+    const int numVars = bitbuf.ReadByte();
+    cvar_t cvar;
+    for (int i = 0; i < numVars; ++i)
+    {
+        bitbuf.ReadString(cvar.name, sizeof(cvar.name));
+        bitbuf.ReadString(cvar.value, sizeof(cvar.value));
+    }
+}
+
+void Net_SignonState(CBitRead& bitbuf)
+{
+    const int signonState = bitbuf.ReadByte();
+    //assert(signonState == SIGNONSTATE_PRESPAWN);
+    const int spawnCount = bitbuf.ReadLong();
+}
+
+void SVC_Print(CBitRead& bitbuf)
+{
+    char textBuffer[2048];
+    bitbuf.ReadString(textBuffer, sizeof(textBuffer));
+}
+
+void SVC_ServerInfo(CBitRead& bitbuf)
+{
+    const int protocol = bitbuf.ReadShort();            // protocol version
+    const int serverCount = bitbuf.ReadLong();          // number of changelevels since server start
+    const bool isHLTV = bitbuf.ReadOneBit() != 0;       // HLTV server ?
+    const bool isDedicated = bitbuf.ReadOneBit() != 0;  // dedicated server ?
+    const int clientCRC = bitbuf.ReadLong();            // client.dll CRC server is using
+    const int maxClasses = bitbuf.ReadWord();           // max number of server classes
+
+    if (protocol <= 17)
+    {
+        const int mapCRC = bitbuf.ReadLong();           // server map CRC
+    }
+    else
+    {
+        char unknown[16];
+        bitbuf.ReadBytes(unknown, sizeof(unknown));
+    }
+    const int playerSlot = bitbuf.ReadByte();           // our client slot number
+    const int maxClients = bitbuf.ReadByte();           // max number of clients on server
+    const float tickInterval = bitbuf.ReadFloat();      // server tick interval
+    const char os = bitbuf.ReadChar();                  // 'l' = linux, 'w' = Win32
+
+    char gameDir[MAX_OSPATH];   // game directory eg "tf2"
+    char mapName[MAX_OSPATH];   // name of current map 
+    char skyName[MAX_OSPATH];   // name of current skybox 
+    char hostName[MAX_OSPATH];  // host name
+    bitbuf.ReadString(gameDir, sizeof(gameDir));
+    bitbuf.ReadString(mapName, sizeof(mapName));
+    bitbuf.ReadString(skyName, sizeof(skyName));
+    bitbuf.ReadString(hostName, sizeof(hostName));
+}
+
+void SVC_SendTable(CBitRead& bitbuf)
+{
+    const bool needsDecoder = bitbuf.ReadOneBit() != 0;
+    const int dataLengthBits = bitbuf.ReadShort();
+    bitbuf.SeekRelative(dataLengthBits);
+}
+
+void SVC_ClassInfo(CBitRead& bitbuf)
+{
+    typedef struct class_s
+    {
+        int     classID;
+        char    datatablename[256];
+        char    classname[256];
+    } class_t;
+
+    const int numServerClasses = bitbuf.ReadShort();
+    const int nServerClassBits = math::log2(numServerClasses) + 1;
+    // if true, client creates own SendTables & classinfos from game.dll
+    const bool createOnClient = bitbuf.ReadOneBit() != 0;
+    if (!createOnClient)
+    {
+        class_t serverclass;
+        for (int i = 0; i < numServerClasses; ++i)
+        {
+            serverclass.classID = bitbuf.ReadUBitLong(nServerClassBits);
+            bitbuf.ReadString(serverclass.classname, sizeof(serverclass.classname));
+            bitbuf.ReadString(serverclass.datatablename, sizeof(serverclass.datatablename));
+        }
+    }
+}
+
+void SVC_SetPause(CBitRead& bitbuf)
+{
+    const bool paused = bitbuf.ReadOneBit() != 0;
+}
+
+void SVC_CreateStringTable(CBitRead& bitbuf)
+{
+    if (bitbuf.PeekUBitLong(8) == ':')
+    {
+        bitbuf.ReadByte();
+    }
+
+    char tableName[256];
+    bitbuf.ReadString(tableName, sizeof(tableName));
+    const int maxEntries = bitbuf.ReadWord();
+    const int encodeBits = math::log2(maxEntries);
+    const int numEntries = bitbuf.ReadUBitLong(encodeBits + 1);
+    const int lengthInBits = bitbuf.ReadUBitLong(NET_MAX_PALYLOAD_BITS + 3);
+    const bool userDataFixedSize = bitbuf.ReadOneBit() != 0;
+    if (userDataFixedSize)
+    {
+        const int userDataSize = bitbuf.ReadUBitLong(12);
+        const int userDataSizeBits = bitbuf.ReadUBitLong(4);
+    }
+    bitbuf.SeekRelative(lengthInBits);
+}
+
+void SVC_UpdateStringTable(CBitRead& bitbuf)
+{
+    const int tableId = bitbuf.ReadUBitLong(math::log2(MAX_TABLES));
+    const int numChangedEntries = (bitbuf.ReadOneBit() != 0) ? bitbuf.ReadWord() : 1;
+    const int lengthInBits = bitbuf.ReadUBitLong(20);
+    bitbuf.SeekRelative(lengthInBits);
+}
+
+void SVC_VoiceInit(CBitRead& bitbuf)
+{
+    char voiceCodec[MAX_OSPATH]; // used voice codec .dll
+    bitbuf.ReadString(voiceCodec, sizeof(voiceCodec));
+    const int quality = bitbuf.ReadByte(); // custom quality setting
+}
+
+void SVC_VoiceData(CBitRead& bitbuf)
+{
+    const int fromClientIndex = bitbuf.ReadByte();
+    const bool proximity = !!bitbuf.ReadByte();
+    const int lengthInBits = bitbuf.ReadWord();
+    bitbuf.SeekRelative(lengthInBits);
+}
+
+void SVC_HLTV(CBitRead& bitbuf)
+{
+    //const int state = bitbuf.ReadByte();
+    assert(false);
+}
+
+void SVC_Sounds(CBitRead& bitbuf)
+{
+    const bool reliableSound = bitbuf.ReadOneBit() != 0;
+    int numSounds;
+    int lengthInBits;
+    if (reliableSound)
+    {
+        numSounds = 1;
+        lengthInBits = bitbuf.ReadUBitLong(8);
+    }
+    else
+    {
+        numSounds = bitbuf.ReadUBitLong(8);
+        lengthInBits = bitbuf.ReadUBitLong(16);
+    }
+    bitbuf.SeekRelative(lengthInBits);
+}
+
+void SVC_SetView(CBitRead& bitbuf)
+{
+    const int entIndex = bitbuf.ReadUBitLong(MAX_EDICT_BITS);
+}
+
+void SVC_FixAngle(CBitRead& bitbuf)
+{
+    const bool relative = bitbuf.ReadOneBit() != 0;
+    const float x = bitbuf.ReadBitAngle(16);
+    const float y = bitbuf.ReadBitAngle(16);
+    const float z = bitbuf.ReadBitAngle(16);
+}
+
+void SVC_CrosshairAngle(CBitRead& bitbuf)
+{
+    const float x = bitbuf.ReadBitAngle(16);
+    const float y = bitbuf.ReadBitAngle(16);
+    const float z = bitbuf.ReadBitAngle(16);
+}
+
+void SVC_BSPDecal(CBitRead& bitbuf)
+{
+    Vector pos;
+    bitbuf.ReadBitVec3Coord(pos);
+    const int decalTextureIndex = bitbuf.ReadUBitLong(MAX_DECAL_INDEX_BITS);
+    if (bitbuf.ReadOneBit() != 0)
+    {
+        const int entIndex = bitbuf.ReadUBitLong(MAX_EDICT_BITS);
+        const int modelIndex = bitbuf.ReadUBitLong(SP_MODEL_INDEX_BITS);
+    }
+    else
+    {
+        const int entIndex = 0;
+        const int modelIndex = 0;
+    }
+    const bool lowPriority = bitbuf.ReadOneBit() != 0;
+}
+
+void SVC_TerrainMod(CBitRead& bitbuf)
+{
+    assert(false);
+}
+
+void SVC_UserMessage(CBitRead& bitbuf)
+{
+    const int msgType = bitbuf.ReadByte();
+
+    // max 256 * 8 bits, see MAX_USER_MSG_DATA
+    const int lengthInBits = bitbuf.ReadUBitLong(11);
+    bitbuf.SeekRelative(lengthInBits);
+}
+
+void SVC_EntityMessage(CBitRead& bitbuf)
+{
+    const int entIndex = bitbuf.ReadUBitLong(MAX_EDICT_BITS);
+    const int classID = bitbuf.ReadUBitLong(MAX_SERVER_CLASS_BITS);
+
+    // max 256 * 8 bits
+    const int lengthInBits = bitbuf.ReadUBitLong(11);
+    bitbuf.SeekRelative(lengthInBits);
+}
+
+void SVC_GameEvent(CBitRead& bitbuf)
+{
+    const int lengthInBits = bitbuf.ReadUBitLong(11);
+    //uint32 eventId = bitbuf.ReadUBitLong(9);
+    bitbuf.SeekRelative(lengthInBits);
+}
+
+void SVC_PacketEntities(CBitRead& bitbuf)
+{
+    const int maxEntries = bitbuf.ReadUBitLong(MAX_EDICT_BITS);
+    const bool isDelta = bitbuf.ReadOneBit() != 0;
+    if (isDelta)
+    {
+        const int deltaFrom = bitbuf.ReadLong();
+    }
+    else
+    {
+        const int deltaFrom = -1;
+    }
+    const int numBaseline = bitbuf.ReadUBitLong(1);
+    const int numUpdatedEntries = bitbuf.ReadUBitLong(MAX_EDICT_BITS);
+    const int lengthInBits = bitbuf.ReadUBitLong(DELTASIZE_BITS);
+    const bool updateBaseline = bitbuf.ReadOneBit() != 0;
+    bitbuf.SeekRelative(lengthInBits);
+}
+
+void SVC_TempEntities(CBitRead& bitbuf)
+{
+    const int numEntries = bitbuf.ReadUBitLong(EVENT_INDEX_BITS);
+    const int lengthInBits = bitbuf.ReadUBitLong(NET_MAX_PALYLOAD_BITS);
+    bitbuf.SeekRelative(lengthInBits);
+}
+
+void SVC_Prefetch(CBitRead& bitbuf)
+{
+    enum
+    {
+        SOUND = 0,
+    };
+
+    const short type = SOUND; // bitbuf.ReadUBitLong(1);
+    const short soundIndex = bitbuf.ReadUBitLong(MAX_SOUND_INDEX_BITS);
+}
+
+void SVC_Menu(CBitRead& bitbuf)
+{
+    typedef enum
+    {
+        DIALOG_MSG = 0,		// just an on screen message
+        DIALOG_MENU,		// an options menu
+        DIALOG_TEXT,		// a richtext dialog
+        DIALOG_ENTRY,		// an entry box
+        DIALOG_ASKCONNECT	// Ask the client to connect to a specified IP address. Only the "time" and "title" keys are used.
+    } DIALOG_TYPE;
+
+    DIALOG_TYPE type = (DIALOG_TYPE)bitbuf.ReadShort();
+    const int lengthInBytes = bitbuf.ReadWord();
+    bitbuf.SeekRelative(lengthInBytes * 8);
+}
+
+void SVC_GameEventList(CBitRead& bitbuf)
+{
+    const int numEvents = bitbuf.ReadUBitLong(MAX_EVENT_BITS);
+    for (int i = 0; i < numEvents; ++i)
+    {
+        const int id = bitbuf.ReadUBitLong(MAX_EVENT_BITS);
+        char name[MAX_EVENT_NAME_LENGTH];
+        bitbuf.ReadString(name, sizeof(name));
+        printf("%s\n", name);
+        assert(false);
+        // gameeventmanager.cpp ParseEventList
+    }
+    const int lengthInBits = bitbuf.ReadUBitLong(20);
+    bitbuf.SeekRelative(lengthInBits);
+}
+
+void SVC_GetCvarValue(CBitRead& bitbuf)
+{
+    typedef int QueryCvarCookie_t;
+    QueryCvarCookie_t cookie = bitbuf.ReadSBitLong(32);
+    char cvarName[256];
+    bitbuf.ReadString(cvarName, sizeof(cvarName));
+}
+
+static const int NUM_MESSAGES = static_cast<uint8_t>(NetMsg::SVC_LASTMSG) + 1;
+
+void ProcessNetMsg(const std::uint32_t msgType, CBitRead& bitbuf)
+{
+    static NetMsgFn netMsgHandler[NUM_MESSAGES] =
+    {
+        &Net_NOP,
+        &Net_Disconnect,
+        &Net_File,
+        &Net_Tick,
+        &Net_StringCmd,
+        &Net_SetConVar,
+        &Net_SignonState,
+
+        &SVC_Print,
+        &SVC_ServerInfo,
+        &SVC_SendTable,
+        &SVC_ClassInfo,
+        &SVC_SetPause,
+        &SVC_CreateStringTable,
+        &SVC_UpdateStringTable,
+        &SVC_VoiceInit,
+        &SVC_VoiceData,
+        &SVC_HLTV,
+        &SVC_Sounds,
+        &SVC_SetView,
+        &SVC_FixAngle,
+        &SVC_CrosshairAngle,
+        &SVC_BSPDecal,
+        &SVC_TerrainMod,
+        &SVC_UserMessage,
+        &SVC_EntityMessage,
+        &SVC_GameEvent,
+        &SVC_PacketEntities,
+        &SVC_TempEntities,
+        &SVC_Prefetch,
+        &SVC_Menu,
+        &SVC_GameEventList,
+        &SVC_GetCvarValue
+    };
+
+    assert(msgType < NUM_MESSAGES);
+    netMsgHandler[msgType](bitbuf);
+}

demboyz/netmessages.h

@@ -0,0 +1,114 @@
+
+#pragma once
+
+#include <cstdint>
+
+class CBitRead;
+
+typedef void(*NetMsgFn)(CBitRead& bitbuf);
+
+enum constants
+{
+    // was 5
+    NETMSG_TYPE_BITS = 6,           // 2^NETMSG_TYPE_BITS > SVC_LASTMSG
+    
+    // was 96000
+    NET_MAX_PAYLOAD = 288000,       // largest message size in bytes
+    
+    // was 17
+    NET_MAX_PALYLOAD_BITS = 19,     // 2^NET_MAX_PALYLOAD_BITS > NET_MAX_PAYLOAD
+    
+    // table index is sent in log2(MAX_TABLES) bits
+    MAX_TABLES = 32,                // Table id is 4 bits
+
+    // How many bits to use to encode an edict.
+    MAX_EDICT_BITS = 11,            // # of bits needed to represent max edicts
+
+    // Max # of edicts in a level
+    MAX_EDICTS = (1<<MAX_EDICT_BITS),
+    MAX_DECAL_INDEX_BITS = 9,
+    SP_MODEL_INDEX_BITS = 11,
+    MAX_SERVER_CLASS_BITS = 9,
+    
+    MAX_EVENT_NAME_LENGTH = 32,
+    MAX_EVENT_BITS = 9,
+    MAX_EVENT_NUMBER = (1 << MAX_EVENT_BITS),
+    MAX_EVENT_BYTES = 1024,
+
+    DELTASIZE_BITS = 20,             // must be: 2^DELTASIZE_BITS > (NET_MAX_PAYLOAD * 8)
+    EVENT_INDEX_BITS = 8,
+    MAX_SOUND_INDEX_BITS = 13,
+
+
+    SIGNONSTATE_NONE        = 0, // no state yet, about to connect
+    SIGNONSTATE_CHALLENGE   = 1, // client challenging server, all OOB packets
+    SIGNONSTATE_CONNECTED   = 2, // client is connected to server, netchans ready
+    SIGNONSTATE_NEW         = 3, // just got serverinfo and string tables
+    SIGNONSTATE_PRESPAWN    = 4, // received signon buffers
+    SIGNONSTATE_SPAWN       = 5, // ready to receive entity packets
+    SIGNONSTATE_FULL        = 6, // we are fully connected, first non-delta packet received
+    SIGNONSTATE_CHANGELEVEL = 7  // server is changing level, please wait
+};
+
+enum class NetMsg: std::uint8_t
+{
+    net_NOP = 0,                // nop command used for padding
+    net_Disconnect = 1,         // disconnect, last message in connection
+    net_File = 2,               // file transmission message request/deny
+
+    net_Tick = 3,               // send last world tick
+    net_StringCmd = 4,          // a string command
+    net_SetConVar = 5,          // sends one/multiple convar settings
+    net_SignonState = 6,        // signals current signon state
+
+    //
+    // server to client
+    //
+
+    svc_Print = 7,              // print text to console
+    svc_ServerInfo = 8,         // first message from server about game, map etc
+    svc_SendTable = 9,          // sends a sendtable description for a game class
+    svc_ClassInfo = 10,         // Info about classes (first byte is a CLASSINFO_ define).							
+    svc_SetPause = 11,          // tells client if server paused or unpaused
+
+
+    svc_CreateStringTable = 12, // inits shared string tables
+    svc_UpdateStringTable = 13,	// updates a string table
+
+    svc_VoiceInit = 14,         // inits used voice codecs & quality
+    svc_VoiceData = 15,         // Voicestream data from the server
+
+    //svc_HLTV = 16,            // HLTV control messages
+
+    svc_Sounds = 17,            // starts playing sound
+
+    svc_SetView = 18,           // sets entity as point of view
+    svc_FixAngle = 19,          // sets/corrects players viewangle
+    svc_CrosshairAngle = 20,    // adjusts crosshair in auto aim mode to lock on traget
+
+    svc_BSPDecal = 21,          // add a static decal to the worl BSP
+
+    // NOTE: This is now unused!
+    // svc_TerrainMod = 22,		// modification to the terrain/displacement
+
+    // Message from server side to client side entity
+    svc_UserMessage = 23,       // a game specific message 
+    svc_EntityMessage = 24,     // a message for an entity
+    svc_GameEvent = 25,         // global game event fired
+
+    svc_PacketEntities = 26,    // non-delta compressed entities
+
+    svc_TempEntities = 27,      // non-reliable event object
+
+    svc_Prefetch = 28,          // only sound indices for now
+
+    svc_Menu = 29,              // display a menu from a plugin
+
+    svc_GameEventList = 30,     // list of known games events and fields
+
+    svc_GetCvarValue = 31,      // Server wants to know the value of a cvar on the client.
+
+    SVC_LASTMSG = 31            // last known server messages
+};
+
+void ProcessNetMsg(const std::uint32_t msgType, CBitRead& bitbuf);