[ENet] Update to upstream master.

7 files changed, 241 insertions, 168 deletions

diff --git a/thirdparty/README.md b/thirdparty/README.md
index 071dea330c..a918acbe77 100644
--- a/thirdparty/README.md
+++ b/thirdparty/README.md
@@ -115,7 +115,7 @@ commits.
 ## enet
 
 - Upstream: http://enet.bespin.org
-- Version: 1.3.17 (e0e7045b7e056b454b5093cb34df49dc4cee0bee, 2020)
+- Version: git (ea4607a90dbfbcf4da2669ea998585253d8e70b1, 2023)
 - License: MIT
 
 Files extracted from upstream source:
diff --git a/thirdparty/enet/enet/enet.h b/thirdparty/enet/enet/enet.h
index 77f8004b80..5232f8a869 100644
--- a/thirdparty/enet/enet/enet.h
+++ b/thirdparty/enet/enet/enet.h
@@ -68,7 +68,8 @@ typedef enum _ENetSocketOption
    ENET_SOCKOPT_RCVTIMEO  = 6,
    ENET_SOCKOPT_SNDTIMEO  = 7,
    ENET_SOCKOPT_ERROR     = 8,
-   ENET_SOCKOPT_NODELAY   = 9
+   ENET_SOCKOPT_NODELAY   = 9,
+   ENET_SOCKOPT_TTL       = 10
 } ENetSocketOption;
 
 typedef enum _ENetSocketShutdown
@@ -179,7 +180,7 @@ typedef struct _ENetOutgoingCommand
    enet_uint16  unreliableSequenceNumber;
    enet_uint32  sentTime;
    enet_uint32  roundTripTimeout;
-   enet_uint32  roundTripTimeoutLimit;
+   enet_uint32  queueTime;
    enet_uint32  fragmentOffset;
    enet_uint16  fragmentLength;
    enet_uint16  sendAttempts;
@@ -222,7 +223,7 @@ enum
    ENET_HOST_RECEIVE_BUFFER_SIZE          = 256 * 1024,
    ENET_HOST_SEND_BUFFER_SIZE             = 256 * 1024,
    ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL  = 1000,
-   ENET_HOST_DEFAULT_MTU                  = 1400,
+   ENET_HOST_DEFAULT_MTU                  = 1392,
    ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE  = 32 * 1024 * 1024,
    ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
 
@@ -262,7 +263,8 @@ typedef struct _ENetChannel
 
 typedef enum _ENetPeerFlag
 {
-   ENET_PEER_FLAG_NEEDS_DISPATCH = (1 << 0)
+   ENET_PEER_FLAG_NEEDS_DISPATCH   = (1 << 0),
+   ENET_PEER_FLAG_CONTINUE_SENDING = (1 << 1)
 } ENetPeerFlag;
 
 /**
@@ -322,7 +324,7 @@ typedef struct _ENetPeer
    enet_uint16   outgoingReliableSequenceNumber;
    ENetList      acknowledgements;
    ENetList      sentReliableCommands;
-   ENetList      sentUnreliableCommands;
+   ENetList      outgoingSendReliableCommands;
    ENetList      outgoingCommands;
    ENetList      dispatchedCommands;
    enet_uint16   flags;
@@ -385,7 +387,7 @@ typedef struct _ENetHost
    size_t               channelLimit;                /**< maximum number of channels allowed for connected peers */
    enet_uint32          serviceTime;
    ENetList             dispatchQueue;
-   int                  continueSending;
+   enet_uint32          totalQueued;
    size_t               packetSize;
    enet_uint16          headerFlags;
    ENetProtocol         commands [ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
@@ -585,6 +587,7 @@ ENET_API void       enet_host_channel_limit (ENetHost *, size_t);
 ENET_API void       enet_host_bandwidth_limit (ENetHost *, enet_uint32, enet_uint32);
 extern   void       enet_host_bandwidth_throttle (ENetHost *);
 extern  enet_uint32 enet_host_random_seed (void);
+extern  enet_uint32 enet_host_random (ENetHost *);
 
 ENET_API int                 enet_peer_send (ENetPeer *, enet_uint8, ENetPacket *);
 ENET_API ENetPacket *        enet_peer_receive (ENetPeer *, enet_uint8 * channelID);
@@ -598,6 +601,7 @@ ENET_API void                enet_peer_disconnect_later (ENetPeer *, enet_uint32
 ENET_API void                enet_peer_throttle_configure (ENetPeer *, enet_uint32, enet_uint32, enet_uint32);
 extern int                   enet_peer_throttle (ENetPeer *, enet_uint32);
 extern void                  enet_peer_reset_queues (ENetPeer *);
+extern int                   enet_peer_has_outgoing_commands (ENetPeer *);
 extern void                  enet_peer_setup_outgoing_command (ENetPeer *, ENetOutgoingCommand *);
 extern ENetOutgoingCommand * enet_peer_queue_outgoing_command (ENetPeer *, const ENetProtocol *, ENetPacket *, enet_uint32, enet_uint16);
 extern ENetIncomingCommand * enet_peer_queue_incoming_command (ENetPeer *, const ENetProtocol *, const void *, size_t, enet_uint32, enet_uint32);
diff --git a/thirdparty/enet/godot.cpp b/thirdparty/enet/godot.cpp
index 2cbfe59fc6..9ce126a475 100644
--- a/thirdparty/enet/godot.cpp
+++ b/thirdparty/enet/godot.cpp
@@ -535,6 +535,10 @@ int enet_socket_receive(ENetSocket socket, ENetAddress *address, ENetBuffer *buf
 	if (err == ERR_BUSY) {
 		return 0;
 	}
+	if (err == ERR_OUT_OF_MEMORY) {
+		// A packet above the ENET_PROTOCOL_MAXIMUM_MTU was received.
+		return -2;
+	}
 
 	if (err != OK) {
 		return -1;
diff --git a/thirdparty/enet/host.c b/thirdparty/enet/host.c
index 21ab27e247..adb3533cf1 100644
--- a/thirdparty/enet/host.c
+++ b/thirdparty/enet/host.c
@@ -96,6 +96,7 @@ enet_host_create (const ENetAddress * address, size_t peerCount, size_t channelL
     host -> totalSentPackets = 0;
     host -> totalReceivedData = 0;
     host -> totalReceivedPackets = 0;
+    host -> totalQueued = 0;
 
     host -> connectedPeers = 0;
     host -> bandwidthLimitedPeers = 0;
@@ -123,8 +124,8 @@ enet_host_create (const ENetAddress * address, size_t peerCount, size_t channelL
 
        enet_list_clear (& currentPeer -> acknowledgements);
        enet_list_clear (& currentPeer -> sentReliableCommands);
-       enet_list_clear (& currentPeer -> sentUnreliableCommands);
        enet_list_clear (& currentPeer -> outgoingCommands);
+       enet_list_clear (& currentPeer -> outgoingSendReliableCommands);
        enet_list_clear (& currentPeer -> dispatchedCommands);
 
        enet_peer_reset (currentPeer);
@@ -160,6 +161,16 @@ enet_host_destroy (ENetHost * host)
     enet_free (host);
 }
 
+enet_uint32
+enet_host_random (ENetHost * host)
+{
+    /* Mulberry32 by Tommy Ettinger */
+    enet_uint32 n = (host -> randomSeed += 0x6D2B79F5U);
+    n = (n ^ (n >> 15)) * (n | 1U);
+    n ^= n + (n ^ (n >> 7)) * (n | 61U);
+    return n ^ (n >> 14);
+}
+
 /** Initiates a connection to a foreign host.
     @param host host seeking the connection
     @param address destination for the connection
@@ -199,7 +210,8 @@ enet_host_connect (ENetHost * host, const ENetAddress * address, size_t channelC
     currentPeer -> channelCount = channelCount;
     currentPeer -> state = ENET_PEER_STATE_CONNECTING;
     currentPeer -> address = * address;
-    currentPeer -> connectID = ++ host -> randomSeed;
+    currentPeer -> connectID = enet_host_random (host);
+    currentPeer -> mtu = host -> mtu;
 
     if (host -> outgoingBandwidth == 0)
       currentPeer -> windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
diff --git a/thirdparty/enet/packet.c b/thirdparty/enet/packet.c
index 5fa78b28ae..d51c640404 100644
--- a/thirdparty/enet/packet.c
+++ b/thirdparty/enet/packet.c
@@ -98,53 +98,46 @@ enet_packet_resize (ENetPacket * packet, size_t dataLength)
     return 0;
 }
 
-static int initializedCRC32 = 0;
-static enet_uint32 crcTable [256];
-
-static enet_uint32 
-reflect_crc (int val, int bits)
+static const enet_uint32 crcTable [256] =
 {
-    int result = 0, bit;
-
-    for (bit = 0; bit < bits; bit ++)
-    {
-        if(val & 1) result |= 1 << (bits - 1 - bit); 
-        val >>= 1;
-    }
-
-    return result;
-}
-
-static void 
-initialize_crc32 (void)
-{
-    int byte;
-
-    for (byte = 0; byte < 256; ++ byte)
-    {
-        enet_uint32 crc = reflect_crc (byte, 8) << 24;
-        int offset;
+    0,          0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
+    0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
+    0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
+    0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
+    0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
+    0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
+    0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
+    0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
+    0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
+    0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
+    0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
+    0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
+    0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
+    0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
+    0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
+    0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
+    0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
+    0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
+    0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
+    0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
+    0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
+    0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
+    0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
+    0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
+    0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x5005713,
+    0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0xBDBDF21,
+    0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
+    0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
+    0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
+    0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
+    0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
+    0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
+};
 
-        for(offset = 0; offset < 8; ++ offset)
-        {
-            if (crc & 0x80000000)
-                crc = (crc << 1) ^ 0x04c11db7;
-            else
-                crc <<= 1;
-        }
-
-        crcTable [byte] = reflect_crc (crc, 32);
-    }
-
-    initializedCRC32 = 1;
-}
-    
 enet_uint32
 enet_crc32 (const ENetBuffer * buffers, size_t bufferCount)
 {
     enet_uint32 crc = 0xFFFFFFFF;
-    
-    if (! initializedCRC32) initialize_crc32 ();
 
     while (bufferCount -- > 0)
     {
@@ -153,7 +146,7 @@ enet_crc32 (const ENetBuffer * buffers, size_t bufferCount)
 
         while (data < dataEnd)
         {
-            crc = (crc >> 8) ^ crcTable [(crc & 0xFF) ^ *data++];        
+            crc = (crc >> 8) ^ crcTable [(crc & 0xFF) ^ *data++];
         }
 
         ++ buffers;
diff --git a/thirdparty/enet/peer.c b/thirdparty/enet/peer.c
index 9370ef4be1..a7ac012079 100644
--- a/thirdparty/enet/peer.c
+++ b/thirdparty/enet/peer.c
@@ -90,6 +90,13 @@ enet_peer_throttle (ENetPeer * peer, enet_uint32 rtt)
 }
 
 /** Queues a packet to be sent.
+
+    On success, ENet will assume ownership of the packet, and so enet_packet_destroy
+    should not be called on it thereafter. On failure, the caller still must destroy
+    the packet on its own as ENet has not queued the packet. The caller can also
+    check the packet's referenceCount field after sending to check if ENet queued
+    the packet and thus incremented the referenceCount.
+
     @param peer destination for the packet
     @param channelID channel on which to send
     @param packet packet to send
@@ -99,7 +106,7 @@ enet_peer_throttle (ENetPeer * peer, enet_uint32 rtt)
 int
 enet_peer_send (ENetPeer * peer, enet_uint8 channelID, ENetPacket * packet)
 {
-   ENetChannel * channel = & peer -> channels [channelID];
+   ENetChannel * channel;
    ENetProtocol command;
    size_t fragmentLength;
 
@@ -108,6 +115,7 @@ enet_peer_send (ENetPeer * peer, enet_uint8 channelID, ENetPacket * packet)
        packet -> dataLength > peer -> host -> maximumPacketSize)
      return -1;
 
+   channel = & peer -> channels [channelID];
    fragmentLength = peer -> mtu - sizeof (ENetProtocolHeader) - sizeof (ENetProtocolSendFragment);
    if (peer -> host -> checksum != NULL)
      fragmentLength -= sizeof(enet_uint32);
@@ -320,8 +328,8 @@ enet_peer_reset_queues (ENetPeer * peer)
       enet_free (enet_list_remove (enet_list_begin (& peer -> acknowledgements)));
 
     enet_peer_reset_outgoing_commands (& peer -> sentReliableCommands);
-    enet_peer_reset_outgoing_commands (& peer -> sentUnreliableCommands);
     enet_peer_reset_outgoing_commands (& peer -> outgoingCommands);
+    enet_peer_reset_outgoing_commands (& peer -> outgoingSendReliableCommands);
     enet_peer_reset_incoming_commands (& peer -> dispatchedCommands);
 
     if (peer -> channels != NULL && peer -> channelCount > 0)
@@ -563,6 +571,17 @@ enet_peer_disconnect (ENetPeer * peer, enet_uint32 data)
     }
 }
 
+int
+enet_peer_has_outgoing_commands (ENetPeer * peer)
+{
+  if (enet_list_empty (& peer -> outgoingCommands) &&
+      enet_list_empty (& peer -> outgoingSendReliableCommands) &&
+      enet_list_empty (& peer -> sentReliableCommands))
+    return 0;
+
+  return 1;
+}
+
 /** Request a disconnection from a peer, but only after all queued outgoing packets are sent.
     @param peer peer to request a disconnection
     @param data data describing the disconnection
@@ -573,8 +592,7 @@ void
 enet_peer_disconnect_later (ENetPeer * peer, enet_uint32 data)
 {   
     if ((peer -> state == ENET_PEER_STATE_CONNECTED || peer -> state == ENET_PEER_STATE_DISCONNECT_LATER) && 
-        ! (enet_list_empty (& peer -> outgoingCommands) &&
-           enet_list_empty (& peer -> sentReliableCommands)))
+        enet_peer_has_outgoing_commands (peer))
     {
         peer -> state = ENET_PEER_STATE_DISCONNECT_LATER;
         peer -> eventData = data;
@@ -618,8 +636,6 @@ enet_peer_queue_acknowledgement (ENetPeer * peer, const ENetProtocol * command,
 void
 enet_peer_setup_outgoing_command (ENetPeer * peer, ENetOutgoingCommand * outgoingCommand)
 {
-    ENetChannel * channel = & peer -> channels [outgoingCommand -> command.header.channelID];
-    
     peer -> outgoingDataTotal += enet_protocol_command_size (outgoingCommand -> command.header.command) + outgoingCommand -> fragmentLength;
 
     if (outgoingCommand -> command.header.channelID == 0xFF)
@@ -630,36 +646,40 @@ enet_peer_setup_outgoing_command (ENetPeer * peer, ENetOutgoingCommand * outgoin
        outgoingCommand -> unreliableSequenceNumber = 0;
     }
     else
-    if (outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
     {
-       ++ channel -> outgoingReliableSequenceNumber;
-       channel -> outgoingUnreliableSequenceNumber = 0;
+        ENetChannel * channel = & peer -> channels [outgoingCommand -> command.header.channelID];
 
-       outgoingCommand -> reliableSequenceNumber = channel -> outgoingReliableSequenceNumber;
-       outgoingCommand -> unreliableSequenceNumber = 0;
-    }
-    else
-    if (outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED)
-    {
-       ++ peer -> outgoingUnsequencedGroup;
+        if (outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
+        {
+           ++ channel -> outgoingReliableSequenceNumber;
+           channel -> outgoingUnreliableSequenceNumber = 0;
 
-       outgoingCommand -> reliableSequenceNumber = 0;
-       outgoingCommand -> unreliableSequenceNumber = 0;
-    }
-    else
-    {
-       if (outgoingCommand -> fragmentOffset == 0)
-         ++ channel -> outgoingUnreliableSequenceNumber;
-        
-       outgoingCommand -> reliableSequenceNumber = channel -> outgoingReliableSequenceNumber;
-       outgoingCommand -> unreliableSequenceNumber = channel -> outgoingUnreliableSequenceNumber;
+           outgoingCommand -> reliableSequenceNumber = channel -> outgoingReliableSequenceNumber;
+           outgoingCommand -> unreliableSequenceNumber = 0;
+        }
+        else
+        if (outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED)
+        {
+           ++ peer -> outgoingUnsequencedGroup;
+
+           outgoingCommand -> reliableSequenceNumber = 0;
+           outgoingCommand -> unreliableSequenceNumber = 0;
+        }
+        else
+        {
+           if (outgoingCommand -> fragmentOffset == 0)
+             ++ channel -> outgoingUnreliableSequenceNumber;
+
+           outgoingCommand -> reliableSequenceNumber = channel -> outgoingReliableSequenceNumber;
+           outgoingCommand -> unreliableSequenceNumber = channel -> outgoingUnreliableSequenceNumber;
+        }
     }
-   
+
     outgoingCommand -> sendAttempts = 0;
     outgoingCommand -> sentTime = 0;
     outgoingCommand -> roundTripTimeout = 0;
-    outgoingCommand -> roundTripTimeoutLimit = 0;
     outgoingCommand -> command.header.reliableSequenceNumber = ENET_HOST_TO_NET_16 (outgoingCommand -> reliableSequenceNumber);
+    outgoingCommand -> queueTime = ++ peer -> host -> totalQueued;
 
     switch (outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_MASK)
     {
@@ -670,12 +690,16 @@ enet_peer_setup_outgoing_command (ENetPeer * peer, ENetOutgoingCommand * outgoin
     case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
         outgoingCommand -> command.sendUnsequenced.unsequencedGroup = ENET_HOST_TO_NET_16 (peer -> outgoingUnsequencedGroup);
         break;
-    
+
     default:
         break;
     }
 
-    enet_list_insert (enet_list_end (& peer -> outgoingCommands), outgoingCommand);
+    if ((outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0 &&
+        outgoingCommand -> packet != NULL)
+      enet_list_insert (enet_list_end (& peer -> outgoingSendReliableCommands), outgoingCommand);
+    else
+      enet_list_insert (enet_list_end (& peer -> outgoingCommands), outgoingCommand);
 }
 
 ENetOutgoingCommand *
diff --git a/thirdparty/enet/protocol.c b/thirdparty/enet/protocol.c
index d7fe80f117..af307af7e5 100644
--- a/thirdparty/enet/protocol.c
+++ b/thirdparty/enet/protocol.c
@@ -9,7 +9,7 @@
 #include "enet/time.h"
 #include "enet/enet.h"
 
-static size_t commandSizes [ENET_PROTOCOL_COMMAND_COUNT] =
+static const size_t commandSizes [ENET_PROTOCOL_COMMAND_COUNT] =
 {
     0,
     sizeof (ENetProtocolAcknowledge),
@@ -159,16 +159,16 @@ enet_protocol_notify_disconnect (ENetHost * host, ENetPeer * peer, ENetEvent * e
 }
 
 static void
-enet_protocol_remove_sent_unreliable_commands (ENetPeer * peer)
+enet_protocol_remove_sent_unreliable_commands (ENetPeer * peer, ENetList * sentUnreliableCommands)
 {
     ENetOutgoingCommand * outgoingCommand;
 
-    if (enet_list_empty (& peer -> sentUnreliableCommands))
+    if (enet_list_empty (sentUnreliableCommands))
       return;
 
     do
     {
-        outgoingCommand = (ENetOutgoingCommand *) enet_list_front (& peer -> sentUnreliableCommands);
+        outgoingCommand = (ENetOutgoingCommand *) enet_list_front (sentUnreliableCommands);
         
         enet_list_remove (& outgoingCommand -> outgoingCommandList);
 
@@ -185,14 +185,38 @@ enet_protocol_remove_sent_unreliable_commands (ENetPeer * peer)
         }
 
         enet_free (outgoingCommand);
-    } while (! enet_list_empty (& peer -> sentUnreliableCommands));
+    } while (! enet_list_empty (sentUnreliableCommands));
 
     if (peer -> state == ENET_PEER_STATE_DISCONNECT_LATER &&
-        enet_list_empty (& peer -> outgoingCommands) &&
-        enet_list_empty (& peer -> sentReliableCommands))
+        ! enet_peer_has_outgoing_commands (peer))
       enet_peer_disconnect (peer, peer -> eventData);
 }
 
+static ENetOutgoingCommand *
+enet_protocol_find_sent_reliable_command (ENetList * list, enet_uint16 reliableSequenceNumber, enet_uint8 channelID)
+{
+    ENetListIterator currentCommand;
+
+    for (currentCommand = enet_list_begin (list);
+         currentCommand != enet_list_end (list);
+         currentCommand = enet_list_next (currentCommand))
+    {
+       ENetOutgoingCommand * outgoingCommand = (ENetOutgoingCommand *) currentCommand;
+
+       if (! (outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE))
+         continue;
+
+       if (outgoingCommand -> sendAttempts < 1)
+         break;
+
+       if (outgoingCommand -> reliableSequenceNumber == reliableSequenceNumber &&
+           outgoingCommand -> command.header.channelID == channelID)
+         return outgoingCommand;
+    }
+
+    return NULL;
+}
+
 static ENetProtocolCommand
 enet_protocol_remove_sent_reliable_command (ENetPeer * peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID)
 {
@@ -214,24 +238,9 @@ enet_protocol_remove_sent_reliable_command (ENetPeer * peer, enet_uint16 reliabl
 
     if (currentCommand == enet_list_end (& peer -> sentReliableCommands))
     {
-       for (currentCommand = enet_list_begin (& peer -> outgoingCommands);
-            currentCommand != enet_list_end (& peer -> outgoingCommands);
-            currentCommand = enet_list_next (currentCommand))
-       {
-          outgoingCommand = (ENetOutgoingCommand *) currentCommand;
-
-          if (! (outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE))
-            continue;
-
-          if (outgoingCommand -> sendAttempts < 1) return ENET_PROTOCOL_COMMAND_NONE;
-
-          if (outgoingCommand -> reliableSequenceNumber == reliableSequenceNumber &&
-              outgoingCommand -> command.header.channelID == channelID)
-            break;
-       }
-
-       if (currentCommand == enet_list_end (& peer -> outgoingCommands))
-         return ENET_PROTOCOL_COMMAND_NONE;
+       outgoingCommand = enet_protocol_find_sent_reliable_command (& peer -> outgoingCommands, reliableSequenceNumber, channelID);
+       if (outgoingCommand == NULL)
+         outgoingCommand = enet_protocol_find_sent_reliable_command (& peer -> outgoingSendReliableCommands, reliableSequenceNumber, channelID);
 
        wasSent = 0;
     }
@@ -331,6 +340,7 @@ enet_protocol_handle_connect (ENetHost * host, ENetProtocolHeader * header, ENet
     peer -> state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
     peer -> connectID = command -> connect.connectID;
     peer -> address = host -> receivedAddress;
+    peer -> mtu = host -> mtu;
     peer -> outgoingPeerID = ENET_NET_TO_HOST_16 (command -> connect.outgoingPeerID);
     peer -> incomingBandwidth = ENET_NET_TO_HOST_32 (command -> connect.incomingBandwidth);
     peer -> outgoingBandwidth = ENET_NET_TO_HOST_32 (command -> connect.outgoingBandwidth);
@@ -375,7 +385,8 @@ enet_protocol_handle_connect (ENetHost * host, ENetProtocolHeader * header, ENet
     if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
       mtu = ENET_PROTOCOL_MAXIMUM_MTU;
 
-    peer -> mtu = mtu;
+    if (mtu < peer -> mtu)
+      peer -> mtu = mtu;
 
     if (host -> outgoingBandwidth == 0 &&
         peer -> incomingBandwidth == 0)
@@ -542,7 +553,8 @@ enet_protocol_handle_send_fragment (ENetHost * host, ENetPeer * peer, const ENet
 
     fragmentLength = ENET_NET_TO_HOST_16 (command -> sendFragment.dataLength);
     * currentData += fragmentLength;
-    if (fragmentLength > host -> maximumPacketSize ||
+    if (fragmentLength <= 0 ||
+        fragmentLength > host -> maximumPacketSize ||
         * currentData < host -> receivedData ||
         * currentData > & host -> receivedData [host -> receivedDataLength])
       return -1;
@@ -566,6 +578,7 @@ enet_protocol_handle_send_fragment (ENetHost * host, ENetPeer * peer, const ENet
     if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT ||
         fragmentNumber >= fragmentCount ||
         totalLength > host -> maximumPacketSize ||
+        totalLength < fragmentCount ||
         fragmentOffset >= totalLength ||
         fragmentLength > totalLength - fragmentOffset)
       return -1;
@@ -921,8 +934,7 @@ enet_protocol_handle_acknowledge (ENetHost * host, ENetEvent * event, ENetPeer *
        break;
 
     case ENET_PEER_STATE_DISCONNECT_LATER:
-       if (enet_list_empty (& peer -> outgoingCommands) &&
-           enet_list_empty (& peer -> sentReliableCommands))
+       if (! enet_peer_has_outgoing_commands (peer))
          enet_peer_disconnect (peer, peer -> eventData);
        break;
 
@@ -1230,6 +1242,9 @@ enet_protocol_receive_incoming_commands (ENetHost * host, ENetEvent * event)
                                              & buffer,
                                              1);
 
+       if (receivedLength == -2)
+         continue;
+
        if (receivedLength < 0)
          return -1;
 
@@ -1293,7 +1308,7 @@ enet_protocol_send_acknowledgements (ENetHost * host, ENetPeer * peer)
            buffer >= & host -> buffers [sizeof (host -> buffers) / sizeof (ENetBuffer)] ||
            peer -> mtu - host -> packetSize < sizeof (ENetProtocolAcknowledge))
        {
-          host -> continueSending = 1;
+          peer -> flags |= ENET_PEER_FLAG_CONTINUE_SENDING;
 
           break;
        }
@@ -1333,10 +1348,11 @@ static int
 enet_protocol_check_timeouts (ENetHost * host, ENetPeer * peer, ENetEvent * event)
 {
     ENetOutgoingCommand * outgoingCommand;
-    ENetListIterator currentCommand, insertPosition;
+    ENetListIterator currentCommand, insertPosition, insertSendReliablePosition;
 
     currentCommand = enet_list_begin (& peer -> sentReliableCommands);
     insertPosition = enet_list_begin (& peer -> outgoingCommands);
+    insertSendReliablePosition = enet_list_begin (& peer -> outgoingSendReliableCommands);
 
     while (currentCommand != enet_list_end (& peer -> sentReliableCommands))
     {
@@ -1353,7 +1369,7 @@ enet_protocol_check_timeouts (ENetHost * host, ENetPeer * peer, ENetEvent * even
 
        if (peer -> earliestTimeout != 0 &&
              (ENET_TIME_DIFFERENCE (host -> serviceTime, peer -> earliestTimeout) >= peer -> timeoutMaximum ||
-               (outgoingCommand -> roundTripTimeout >= outgoingCommand -> roundTripTimeoutLimit &&
+               ((1 << (outgoingCommand -> sendAttempts - 1)) >= peer -> timeoutLimit &&
                  ENET_TIME_DIFFERENCE (host -> serviceTime, peer -> earliestTimeout) >= peer -> timeoutMinimum)))
        {
           enet_protocol_notify_disconnect (host, peer, event);
@@ -1361,14 +1377,18 @@ enet_protocol_check_timeouts (ENetHost * host, ENetPeer * peer, ENetEvent * even
           return 1;
        }
 
-       if (outgoingCommand -> packet != NULL)
-         peer -> reliableDataInTransit -= outgoingCommand -> fragmentLength;
-          
        ++ peer -> packetsLost;
 
        outgoingCommand -> roundTripTimeout *= 2;
 
-       enet_list_insert (insertPosition, enet_list_remove (& outgoingCommand -> outgoingCommandList));
+       if (outgoingCommand -> packet != NULL)
+       {
+         peer -> reliableDataInTransit -= outgoingCommand -> fragmentLength;
+
+         enet_list_insert (insertSendReliablePosition, enet_list_remove (& outgoingCommand -> outgoingCommandList));
+       }
+       else
+         enet_list_insert (insertPosition, enet_list_remove (& outgoingCommand -> outgoingCommandList));
 
        if (currentCommand == enet_list_begin (& peer -> sentReliableCommands) &&
            ! enet_list_empty (& peer -> sentReliableCommands))
@@ -1383,22 +1403,41 @@ enet_protocol_check_timeouts (ENetHost * host, ENetPeer * peer, ENetEvent * even
 }
 
 static int
-enet_protocol_check_outgoing_commands (ENetHost * host, ENetPeer * peer)
+enet_protocol_check_outgoing_commands (ENetHost * host, ENetPeer * peer, ENetList * sentUnreliableCommands)
 {
     ENetProtocol * command = & host -> commands [host -> commandCount];
     ENetBuffer * buffer = & host -> buffers [host -> bufferCount];
     ENetOutgoingCommand * outgoingCommand;
-    ENetListIterator currentCommand;
-    ENetChannel *channel;
-    enet_uint16 reliableWindow;
+    ENetListIterator currentCommand, currentSendReliableCommand;
+    ENetChannel *channel = NULL;
+    enet_uint16 reliableWindow = 0;
     size_t commandSize;
-    int windowExceeded = 0, windowWrap = 0, canPing = 1;
+    int windowWrap = 0, canPing = 1;
 
     currentCommand = enet_list_begin (& peer -> outgoingCommands);
-    
-    while (currentCommand != enet_list_end (& peer -> outgoingCommands))
+    currentSendReliableCommand = enet_list_begin (& peer -> outgoingSendReliableCommands);
+
+    for (;;)
     {
-       outgoingCommand = (ENetOutgoingCommand *) currentCommand;
+       if (currentCommand != enet_list_end (& peer -> outgoingCommands))
+       {
+          outgoingCommand = (ENetOutgoingCommand *) currentCommand;
+
+          if (currentSendReliableCommand != enet_list_end (& peer -> outgoingSendReliableCommands) &&
+              ENET_TIME_LESS (((ENetOutgoingCommand *) currentSendReliableCommand) -> queueTime, outgoingCommand -> queueTime))
+            goto useSendReliableCommand;
+
+          currentCommand = enet_list_next (currentCommand);
+       }
+       else
+       if (currentSendReliableCommand != enet_list_end (& peer -> outgoingSendReliableCommands))
+       {
+       useSendReliableCommand:
+          outgoingCommand = (ENetOutgoingCommand *) currentSendReliableCommand;
+          currentSendReliableCommand = enet_list_next (currentSendReliableCommand);
+       }
+       else
+         break;
 
        if (outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
        {
@@ -1406,33 +1445,29 @@ enet_protocol_check_outgoing_commands (ENetHost * host, ENetPeer * peer)
           reliableWindow = outgoingCommand -> reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE;
           if (channel != NULL)
           {
-             if (! windowWrap &&      
-                  outgoingCommand -> sendAttempts < 1 && 
+             if (windowWrap)
+               continue;
+             else
+             if (outgoingCommand -> sendAttempts < 1 &&
                   ! (outgoingCommand -> reliableSequenceNumber % ENET_PEER_RELIABLE_WINDOW_SIZE) &&
                   (channel -> reliableWindows [(reliableWindow + ENET_PEER_RELIABLE_WINDOWS - 1) % ENET_PEER_RELIABLE_WINDOWS] >= ENET_PEER_RELIABLE_WINDOW_SIZE ||
                     channel -> usedReliableWindows & ((((1 << (ENET_PEER_FREE_RELIABLE_WINDOWS + 2)) - 1) << reliableWindow) |
                       (((1 << (ENET_PEER_FREE_RELIABLE_WINDOWS + 2)) - 1) >> (ENET_PEER_RELIABLE_WINDOWS - reliableWindow)))))
-                windowWrap = 1;
-             if (windowWrap)
              {
-                currentCommand = enet_list_next (currentCommand);
- 
+                windowWrap = 1;
+                currentSendReliableCommand = enet_list_end (& peer -> outgoingSendReliableCommands);
+
                 continue;
              }
           }
- 
+
           if (outgoingCommand -> packet != NULL)
           {
-             if (! windowExceeded)
-             {
-                enet_uint32 windowSize = (peer -> packetThrottle * peer -> windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
-             
-                if (peer -> reliableDataInTransit + outgoingCommand -> fragmentLength > ENET_MAX (windowSize, peer -> mtu))
-                  windowExceeded = 1;
-             }
-             if (windowExceeded)
+             enet_uint32 windowSize = (peer -> packetThrottle * peer -> windowSize) / ENET_PEER_PACKET_THROTTLE_SCALE;
+
+             if (peer -> reliableDataInTransit + outgoingCommand -> fragmentLength > ENET_MAX (windowSize, peer -> mtu))
              {
-                currentCommand = enet_list_next (currentCommand);
+                currentSendReliableCommand = enet_list_end (& peer -> outgoingSendReliableCommands);
 
                 continue;
              }
@@ -1448,13 +1483,11 @@ enet_protocol_check_outgoing_commands (ENetHost * host, ENetPeer * peer)
            (outgoingCommand -> packet != NULL && 
              (enet_uint16) (peer -> mtu - host -> packetSize) < (enet_uint16) (commandSize + outgoingCommand -> fragmentLength)))
        {
-          host -> continueSending = 1;
-          
+          peer -> flags |= ENET_PEER_FLAG_CONTINUE_SENDING;
+
           break;
        }
 
-       currentCommand = enet_list_next (currentCommand);
-
        if (outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
        {
           if (channel != NULL && outgoingCommand -> sendAttempts < 1)
@@ -1466,10 +1499,7 @@ enet_protocol_check_outgoing_commands (ENetHost * host, ENetPeer * peer)
           ++ outgoingCommand -> sendAttempts;
  
           if (outgoingCommand -> roundTripTimeout == 0)
-          {
-             outgoingCommand -> roundTripTimeout = peer -> roundTripTime + 4 * peer -> roundTripTimeVariance;
-             outgoingCommand -> roundTripTimeoutLimit = peer -> timeoutLimit * outgoingCommand -> roundTripTimeout;
-          }
+            outgoingCommand -> roundTripTimeout = peer -> roundTripTime + 4 * peer -> roundTripTimeVariance;
 
           if (enet_list_empty (& peer -> sentReliableCommands))
             peer -> nextTimeout = host -> serviceTime + outgoingCommand -> roundTripTimeout;
@@ -1522,7 +1552,7 @@ enet_protocol_check_outgoing_commands (ENetHost * host, ENetPeer * peer)
           enet_list_remove (& outgoingCommand -> outgoingCommandList);
 
           if (outgoingCommand -> packet != NULL)
-            enet_list_insert (enet_list_end (& peer -> sentUnreliableCommands), outgoingCommand);
+            enet_list_insert (enet_list_end (sentUnreliableCommands), outgoingCommand);
        }
 
        buffer -> data = command;
@@ -1555,9 +1585,8 @@ enet_protocol_check_outgoing_commands (ENetHost * host, ENetPeer * peer)
     host -> bufferCount = buffer - host -> buffers;
 
     if (peer -> state == ENET_PEER_STATE_DISCONNECT_LATER &&
-        enet_list_empty (& peer -> outgoingCommands) &&
-        enet_list_empty (& peer -> sentReliableCommands) &&
-        enet_list_empty (& peer -> sentUnreliableCommands))
+        ! enet_peer_has_outgoing_commands (peer) &&
+        enet_list_empty (sentUnreliableCommands))
       enet_peer_disconnect (peer, peer -> eventData);
 
     return canPing;
@@ -1568,22 +1597,24 @@ enet_protocol_send_outgoing_commands (ENetHost * host, ENetEvent * event, int ch
 {
     enet_uint8 headerData [sizeof (ENetProtocolHeader) + sizeof (enet_uint32)];
     ENetProtocolHeader * header = (ENetProtocolHeader *) headerData;
-    ENetPeer * currentPeer;
-    int sentLength;
+    int sentLength = 0;
     size_t shouldCompress = 0;
- 
-    host -> continueSending = 1;
+    ENetList sentUnreliableCommands;
 
-    while (host -> continueSending)
-    for (host -> continueSending = 0,
-           currentPeer = host -> peers;
+    enet_list_clear (& sentUnreliableCommands);
+
+    for (int sendPass = 0, continueSending = 0; sendPass <= continueSending; ++ sendPass)
+    for (ENetPeer * currentPeer = host -> peers;
          currentPeer < & host -> peers [host -> peerCount];
          ++ currentPeer)
     {
         if (currentPeer -> state == ENET_PEER_STATE_DISCONNECTED ||
-            currentPeer -> state == ENET_PEER_STATE_ZOMBIE)
+            currentPeer -> state == ENET_PEER_STATE_ZOMBIE ||
+            (sendPass > 0 && ! (currentPeer -> flags & ENET_PEER_FLAG_CONTINUE_SENDING)))
           continue;
 
+        currentPeer -> flags &= ~ ENET_PEER_FLAG_CONTINUE_SENDING;
+
         host -> headerFlags = 0;
         host -> commandCount = 0;
         host -> bufferCount = 1;
@@ -1600,21 +1631,22 @@ enet_protocol_send_outgoing_commands (ENetHost * host, ENetEvent * event, int ch
             if (event != NULL && event -> type != ENET_EVENT_TYPE_NONE)
               return 1;
             else
-              continue;
+              goto nextPeer;
         }
 
-        if ((enet_list_empty (& currentPeer -> outgoingCommands) ||
-              enet_protocol_check_outgoing_commands (host, currentPeer)) &&
+        if (((enet_list_empty (& currentPeer -> outgoingCommands) &&
+              enet_list_empty (& currentPeer -> outgoingSendReliableCommands)) ||
+             enet_protocol_check_outgoing_commands (host, currentPeer, & sentUnreliableCommands)) &&
             enet_list_empty (& currentPeer -> sentReliableCommands) &&
             ENET_TIME_DIFFERENCE (host -> serviceTime, currentPeer -> lastReceiveTime) >= currentPeer -> pingInterval &&
             currentPeer -> mtu - host -> packetSize >= sizeof (ENetProtocolPing))
         { 
             enet_peer_ping (currentPeer);
-            enet_protocol_check_outgoing_commands (host, currentPeer);
+            enet_protocol_check_outgoing_commands (host, currentPeer, & sentUnreliableCommands);
         }
 
         if (host -> commandCount == 0)
-          continue;
+          goto nextPeer;
 
         if (currentPeer -> packetLossEpoch == 0)
           currentPeer -> packetLossEpoch = host -> serviceTime;
@@ -1625,7 +1657,7 @@ enet_protocol_send_outgoing_commands (ENetHost * host, ENetEvent * event, int ch
            enet_uint32 packetLoss = currentPeer -> packetsLost * ENET_PEER_PACKET_LOSS_SCALE / currentPeer -> packetsSent;
 
 #ifdef ENET_DEBUG
-           printf ("peer %u: %f%%+-%f%% packet loss, %u+-%u ms round trip time, %f%% throttle, %u outgoing, %u/%u incoming\n", currentPeer -> incomingPeerID, currentPeer -> packetLoss / (float) ENET_PEER_PACKET_LOSS_SCALE, currentPeer -> packetLossVariance / (float) ENET_PEER_PACKET_LOSS_SCALE, currentPeer -> roundTripTime, currentPeer -> roundTripTimeVariance, currentPeer -> packetThrottle / (float) ENET_PEER_PACKET_THROTTLE_SCALE, enet_list_size (& currentPeer -> outgoingCommands), currentPeer -> channels != NULL ? enet_list_size (& currentPeer -> channels -> incomingReliableCommands) : 0, currentPeer -> channels != NULL ? enet_list_size (& currentPeer -> channels -> incomingUnreliableCommands) : 0);
+           printf ("peer %u: %f%%+-%f%% packet loss, %u+-%u ms round trip time, %f%% throttle, %u outgoing, %u/%u incoming\n", currentPeer -> incomingPeerID, currentPeer -> packetLoss / (float) ENET_PEER_PACKET_LOSS_SCALE, currentPeer -> packetLossVariance / (float) ENET_PEER_PACKET_LOSS_SCALE, currentPeer -> roundTripTime, currentPeer -> roundTripTimeVariance, currentPeer -> packetThrottle / (float) ENET_PEER_PACKET_THROTTLE_SCALE, enet_list_size (& currentPeer -> outgoingCommands) + enet_list_size (& currentPeer -> outgoingSendReliableCommands), currentPeer -> channels != NULL ? enet_list_size (& currentPeer -> channels -> incomingReliableCommands) : 0, currentPeer -> channels != NULL ? enet_list_size (& currentPeer -> channels -> incomingUnreliableCommands) : 0);
 #endif
 
            currentPeer -> packetLossVariance = (currentPeer -> packetLossVariance * 3 + ENET_DIFFERENCE (packetLoss, currentPeer -> packetLoss)) / 4;
@@ -1687,13 +1719,17 @@ enet_protocol_send_outgoing_commands (ENetHost * host, ENetEvent * event, int ch
 
         sentLength = enet_socket_send (host -> socket, & currentPeer -> address, host -> buffers, host -> bufferCount);
 
-        enet_protocol_remove_sent_unreliable_commands (currentPeer);
+        enet_protocol_remove_sent_unreliable_commands (currentPeer, & sentUnreliableCommands);
 
         if (sentLength < 0)
           return -1;
 
         host -> totalSentData += sentLength;
         host -> totalSentPackets ++;
+
+    nextPeer:
+        if (currentPeer -> flags & ENET_PEER_FLAG_CONTINUE_SENDING)
+          continueSending = sendPass + 1;
     }
    
     return 0;