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enet_protocol.pas
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unit enet_protocol;
(**
@file protocol.c
@brief ENet protocol functions
1.3.14 freepascal
*)
{$GOTO ON}
interface
uses enet_consts;
procedure enet_host_flush (host : pENetHost);
function enet_host_service (host : pENetHost; event : pENetEvent; timeout : enet_uint32):integer;
function enet_protocol_check_timeouts (host : pENetHost; peer : pENetPeer; event : pENetEvent):integer;
function enet_protocol_command_size (commandNumber : enet_uint8):enet_size_t;
function enet_protocol_dispatch_incoming_commands (host : pENetHost;event : pENetEvent):integer;
function enet_protocol_handle_acknowledge (host : pENetHost; event : pENetEvent; peer : pENetPeer; command : pENetProtocol):integer;
function enet_protocol_handle_bandwidth_limit (host : pENetHost; peer : pENetPeer; command : pENetProtocol):integer;
function enet_protocol_handle_connect (host : pENetHost;header : pENetProtocolHeader;command : pENetProtocol):pENetPeer;
function enet_protocol_handle_disconnect (host : pENetHost; peer : pENetPeer; command : pENetProtocol):integer;
function enet_protocol_handle_incoming_commands (host : pENetHost; event : pENetEvent):integer;
function enet_protocol_handle_ping (host : pENetHost; peer : pENetPeer; command : pENetProtocol):integer;
function enet_protocol_handle_send_fragment (host : pENetHost; peer : pENetPeer; command : pENetProtocol; currentData : ppenet_uint8):integer;
function enet_protocol_handle_send_reliable (host : pENetHost; peer : pENetPeer; command : pENetProtocol; currentData : ppenet_uint8):integer;
function enet_protocol_handle_send_unreliable (host : pENetHost; peer : pENetPeer;command : pENetProtocol;currentData : ppenet_uint8):integer;
function enet_protocol_handle_send_unsequenced (host : pENetHost; peer : pENetPeer; command : pENetProtocol; currentData : ppenet_uint8):integer;
function enet_protocol_handle_throttle_configure (host : pENetHost; peer : pENetPeer; command : pENetProtocol):integer;
function enet_protocol_handle_verify_connect (host : pENetHost; event : pENetEvent; peer : pENetPeer; command : pENetProtocol):integer;
procedure enet_protocol_notify_connect (host : pENetHost;peer : pENetPeer;event : pENetEvent);
procedure enet_protocol_notify_disconnect (host : pENetHost;peer : pENetPeer;event : pENetEvent);
function enet_protocol_receive_incoming_commands (host : pENetHost; event : pENetEvent):integer;
function enet_protocol_remove_sent_reliable_command (peer : pENetPeer;reliableSequenceNumber : enet_uint16;channelID : enet_uint8):ENetProtocolCommand;
procedure enet_protocol_remove_sent_unreliable_commands (peer : pENetPeer);
procedure enet_protocol_send_acknowledgements (host : pENetHost; peer : pENetPeer);
function enet_protocol_send_outgoing_commands (host : pENetHost; event : pENetEvent; checkForTimeouts : integer):integer;
function enet_protocol_send_reliable_outgoing_commands (host : pENetHost; peer : pENetPeer):Integer;
procedure enet_protocol_send_unreliable_outgoing_commands (host : pENetHost;peer : pENetPeer);
function enet_host_check_events (host : pENetHost; event : pENetEvent):integer;
procedure enet_protocol_change_state (host:pENetHost; peer:pENetPeer; state: (*ENetPeerState*)enet_uint32 );
procedure enet_protocol_dispatch_state (host:pENetHost; peer:pENetPeer; state: (*ENetPeerState*)enet_uint32);
const
commandSizes : array[0..(ENET_PROTOCOL_COMMAND_COUNT)-1] of enet_size_t =
(
0,
sizeof (ENetProtocolAcknowledge),
sizeof (ENetProtocolConnect),
sizeof (ENetProtocolVerifyConnect),
sizeof (ENetProtocolDisconnect),
sizeof (ENetProtocolPing),
sizeof (ENetProtocolSendReliable),
sizeof (ENetProtocolSendUnreliable),
sizeof (ENetProtocolSendFragment),
sizeof (ENetProtocolSendUnsequenced),
sizeof (ENetProtocolBandwidthLimit),
sizeof (ENetProtocolThrottleConfigure),
sizeof (ENetProtocolSendFragment)
);
implementation
uses enet_packet, enet_host, enet_callbacks, enet_list, enet_socket, enet_peer;
function enet_protocol_command_size (commandNumber : enet_uint8):enet_size_t;
begin
result := commandSizes [commandNumber and ENET_PROTOCOL_COMMAND_MASK];
end;
procedure enet_protocol_change_state (host:pENetHost; peer:pENetPeer; state: (*ENetPeerState*)enet_uint32);
begin
if ((state = ENET_PEER_STATE_CONNECTED) or (state = ENET_PEER_STATE_DISCONNECT_LATER)) then
enet_peer_on_connect (peer)
else
enet_peer_on_disconnect (peer);
peer ^. state := state;
end;
procedure enet_protocol_dispatch_state (host:pENetHost; peer:pENetPeer; state: (*ENetPeerState*)enet_uint32);
begin
enet_protocol_change_state (host, peer, state);
if (peer ^. needsDispatch = 0) then
begin
enet_list_insert (enet_list_end (@ host ^. dispatchQueue), @ peer ^. dispatchList);
peer ^. needsDispatch := 1;
end;
end;
function enet_protocol_dispatch_incoming_commands (host : pENetHost;event : pENetEvent):integer;
var
peer : pENetPeer;
begin
while (not enet_list_empty (@ host ^. dispatchQueue)) do
begin
peer := pENetPeer ( enet_list_remove (enet_list_begin (@ host ^. dispatchQueue)));
peer ^. needsDispatch := 0;
case (peer ^. state) of
ENET_PEER_STATE_CONNECTION_PENDING,
ENET_PEER_STATE_CONNECTION_SUCCEEDED:
begin
enet_protocol_change_state (host, peer, ENET_PEER_STATE_CONNECTED);
event ^. EventType := ENET_EVENT_TYPE_CONNECT;
event ^. peer := peer;
event ^. data := peer ^. eventData;
Result:=1; exit;
end;
ENET_PEER_STATE_ZOMBIE:
begin
host ^. recalculateBandwidthLimits := 1;
event ^. EventType := ENET_EVENT_TYPE_DISCONNECT;
event ^. peer := peer;
event ^. data := peer ^. eventData;
enet_peer_reset (peer);
Result:=1; exit;
end;
ENET_PEER_STATE_CONNECTED:
begin
if (enet_list_empty (@ peer ^. dispatchedCommands)) then
continue;
event ^. packet := enet_peer_receive (peer, @ event ^. channelID);
if (event ^. packet = nil) then
continue;
event ^. EventType := ENET_EVENT_TYPE_RECEIVE;
event ^. peer := peer;
if (not enet_list_empty (@ peer ^. dispatchedCommands)) then
begin
peer ^. needsDispatch := 1;
enet_list_insert (enet_list_end (@ host ^. dispatchQueue), @ peer ^. dispatchList);
end;
Result:=1; exit;
end;
end;
end;
Result:=0;
end;
procedure enet_protocol_notify_connect (host : pENetHost;peer : pENetPeer;event : pENetEvent);
var
state : Integer;
begin
host ^. recalculateBandwidthLimits := 1;
if (event <> nil) then
begin
enet_protocol_change_state (host, peer, ENET_PEER_STATE_CONNECTED);
event ^. EventType := ENET_EVENT_TYPE_CONNECT;
event ^. peer := peer;
event ^. data := peer ^. eventData;
end
else begin
if peer ^. state = ENET_PEER_STATE_CONNECTING then
state := ENET_PEER_STATE_CONNECTION_SUCCEEDED
else
state := ENET_PEER_STATE_CONNECTION_PENDING;
enet_protocol_dispatch_state (host, peer, state);
end;
end;
procedure enet_protocol_notify_disconnect (host : pENetHost;peer : pENetPeer;event : pENetEvent);
begin
if (peer ^. state >= ENET_PEER_STATE_CONNECTION_PENDING) then
host ^. recalculateBandwidthLimits := 1;
if (peer ^. state <> ENET_PEER_STATE_CONNECTING) and (peer ^. state < ENET_PEER_STATE_CONNECTION_SUCCEEDED) then
enet_peer_reset (peer)
else
if (event <> nil) then
begin
event ^. EventType := ENET_EVENT_TYPE_DISCONNECT;
event ^. peer := peer;
event ^. data := 0;
enet_peer_reset (peer);
end
else
begin
peer ^. eventData := 0;
enet_protocol_dispatch_state (host, peer, ENET_PEER_STATE_ZOMBIE);
end;
end;
procedure enet_protocol_remove_sent_unreliable_commands (peer : pENetPeer);
var
outgoingCommand : pENetOutgoingCommand;
begin
if (enet_list_empty (@ peer ^. sentUnreliableCommands)) then
exit;
repeat
outgoingCommand := pENetOutgoingCommand(enet_list_front (@ peer ^. sentUnreliableCommands));
enet_list_remove (@ outgoingCommand ^. outgoingCommandList);
if (outgoingCommand ^. packet <> nil) then
begin
Dec(outgoingCommand ^. packet ^. referenceCount);
if (outgoingCommand ^. packet ^. referenceCount = 0) then
begin
outgoingCommand ^. packet ^. flags := outgoingCommand ^. packet ^. flags or ENET_PACKET_FLAG_SENT;
enet_packet_destroy (outgoingCommand ^. packet);
end;
end;
enet_free (outgoingCommand);
until (enet_list_empty (@ peer ^. sentUnreliableCommands));
if ((peer ^. state = ENET_PEER_STATE_DISCONNECT_LATER) and
enet_list_empty (@ peer ^. outgoingReliableCommands) and
enet_list_empty (@ peer ^. outgoingUnreliableCommands) and
enet_list_empty (@ peer ^. sentReliableCommands)) then
enet_peer_disconnect (peer, peer ^. eventData);
end;
function enet_protocol_remove_sent_reliable_command (peer : pENetPeer;reliableSequenceNumber : enet_uint16;channelID : enet_uint8):ENetProtocolCommand;
var
outgoingCommand : pENetOutgoingCommand;
currentCommand : ENetListIterator;
commandNumber : ENetProtocolCommand;
channel : pENetChannel;
reliableWindow : enet_uint16;
wasSent : Integer;
begin
outgoingCommand:=nil;
wasSent:=1;
currentCommand := enet_list_begin (@ peer ^. sentReliableCommands);
while PChar(currentCommand)<>PChar(enet_list_end (@ peer ^. sentReliableCommands)) do
begin
outgoingCommand := pENetOutgoingCommand (currentCommand);
if (outgoingCommand ^. reliableSequenceNumber = reliableSequenceNumber) and
(outgoingCommand ^. command.header.channelID = channelID) then
break;
currentCommand := enet_list_next (currentCommand);
end;
if PChar(currentCommand)=PChar(enet_list_end (@ peer ^. sentReliableCommands)) then
begin
currentCommand := enet_list_begin (@ peer ^. outgoingReliableCommands);
while PChar(currentCommand)<>PChar(enet_list_end (@ peer ^. outgoingReliableCommands)) do
begin
outgoingCommand := pENetOutgoingCommand (currentCommand);
if (outgoingCommand ^. sendAttempts < 1) then begin result := ENET_PROTOCOL_COMMAND_NONE; exit; end;
if (outgoingCommand ^. reliableSequenceNumber = reliableSequenceNumber) and
(outgoingCommand ^. command.header.channelID = channelID) then
break;
currentCommand := enet_list_next (currentCommand);
end;
if PChar(currentCommand)=PChar(enet_list_end (@ peer ^. outgoingReliableCommands)) then
begin result := ENET_PROTOCOL_COMMAND_NONE; exit; end;
wasSent:=0;
end;
if (outgoingCommand = nil) then
begin Result:= ENET_PROTOCOL_COMMAND_NONE; exit; end;
if (channelID < peer ^. channelCount) then
begin
channel := @ (pENetChannelArray(peer ^. channels)^[channelID]);
reliableWindow := reliableSequenceNumber div ENET_PEER_RELIABLE_WINDOW_SIZE;
if (channel ^. reliableWindows [reliableWindow] > 0) then
begin
Dec( channel ^. reliableWindows [reliableWindow]);
if (0 = channel ^. reliableWindows [reliableWindow]) then
channel ^. usedReliableWindows := channel ^. usedReliableWindows and not(1 shl reliableWindow);
end;
end;
commandNumber := ENetProtocolCommand(outgoingCommand ^. command.header.command and ENET_PROTOCOL_COMMAND_MASK);
enet_list_remove (@ outgoingCommand ^. outgoingCommandList);
if (outgoingCommand ^. packet <> nil) then
begin
if wasSent<>0 then
Dec(peer ^. reliableDataInTransit , outgoingCommand ^. fragmentLength);
Dec( outgoingCommand ^. packet ^. referenceCount);
if (outgoingCommand ^. packet ^. referenceCount = 0) then
begin
outgoingCommand ^. packet ^. flags := outgoingCommand ^. packet ^. flags or ENET_PACKET_FLAG_SENT;
enet_packet_destroy (outgoingCommand ^. packet);
end;
end;
enet_free (outgoingCommand);
if (enet_list_empty (@ peer ^. sentReliableCommands)) then
begin result := commandNumber; exit; end;
outgoingCommand := pENetOutgoingCommand (enet_list_front (@ peer ^. sentReliableCommands));
peer ^. nextTimeout := outgoingCommand ^. sentTime + outgoingCommand ^. roundTripTimeout;
result := commandNumber;
end;
function enet_protocol_handle_connect (host : pENetHost;header : pENetProtocolHeader;command : pENetProtocol):pENetPeer;
var
incomingSessionID, outgoingSessionID : enet_uint8;
mtu, windowSize : enet_uint32;
channel : pENetChannel;
channelCount, duplicatePeers : enet_size_t;
currentPeer, peer : pENetPeer;
verifyCommand : ENetProtocol;
begin
duplicatePeers :=0;
peer :=nil;
channelCount := ENET_NET_TO_HOST_32 (command ^. connect.channelCount);
if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT) or
(channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT) then
begin result := nil; exit; end;
currentPeer := host ^. peers;
while PChar(currentPeer)< PChar(@(pENetPeerArray(host ^. peers)^[host ^. peerCount])) do
begin
if (currentPeer ^. state = ENET_PEER_STATE_DISCONNECTED) then
begin
if (peer = nil) then
peer := currentPeer;
end
else
if ((currentPeer ^. state <> ENET_PEER_STATE_CONNECTING) and
(currentPeer ^. address.host = host ^. receivedAddress.host)) then
begin
if ((currentPeer ^. address.port = host ^. receivedAddress.port) and
(currentPeer ^. connectID = command ^. connect.connectID)) then
begin Result:=nil; exit; end;
Inc(duplicatePeers);
end;
inc(currentPeer);
end;
if ((peer = nil) or (duplicatePeers >= host ^. duplicatePeers)) then
begin result := nil; exit; end;
if (channelCount > host ^. channelLimit) then
channelCount := host ^. channelLimit;
peer ^. channels := pENetChannel (enet_malloc (channelCount * sizeof (ENetChannel)));
if (peer ^. channels = nil) then begin
Result:=nil; exit;
end;
peer ^. channelCount := channelCount;
peer ^. state := ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
peer ^. connectID := command ^. connect.connectID;
peer ^. address := host ^. receivedAddress;
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);
peer ^. packetThrottleInterval := ENET_NET_TO_HOST_32 (command ^. connect.packetThrottleInterval);
peer ^. packetThrottleAcceleration := ENET_NET_TO_HOST_32 (command ^. connect.packetThrottleAcceleration);
peer ^. packetThrottleDeceleration := ENET_NET_TO_HOST_32 (command ^. connect.packetThrottleDeceleration);
peer ^. eventData := ENET_NET_TO_HOST_32 (command ^. connect.data);
if command ^. connect.incomingSessionID=$0ff then
incomingSessionID:= Peer ^. outgoingSessionID
else
incomingSessionID:=command ^. connect.incomingSessionID;
incomingSessionID := (incomingSessionID + 1) and (ENET_PROTOCOL_HEADER_SESSION_MASK shr ENET_PROTOCOL_HEADER_SESSION_SHIFT);
if (incomingSessionID = Peer ^. outgoingSessionID) then
incomingSessionID := (incomingSessionID + 1) and (ENET_PROTOCOL_HEADER_SESSION_MASK shr ENET_PROTOCOL_HEADER_SESSION_SHIFT);
Peer ^. outgoingSessionID := incomingSessionID;
if command ^. connect.outgoingSessionID=$0ff then
outgoingSessionID:=Peer ^. incomingSessionID
else
outgoingSessionID:=command ^. connect.outgoingSessionID;
outgoingSessionID := (outgoingSessionID + 1) and (ENET_PROTOCOL_HEADER_SESSION_MASK shr ENET_PROTOCOL_HEADER_SESSION_SHIFT);
if (outgoingSessionID = Peer ^. incomingSessionID) then
outgoingSessionID := (outgoingSessionID + 1) and (ENET_PROTOCOL_HEADER_SESSION_MASK shr ENET_PROTOCOL_HEADER_SESSION_SHIFT);
Peer ^. incomingSessionID := outgoingSessionID;
channel := Peer ^. channels;
while PChar(channel)< PChar(@(pENetChannelArray(Peer ^. channels)^[channelCount])) do
begin
channel ^. outgoingReliableSequenceNumber := 0;
channel ^. outgoingUnreliableSequenceNumber := 0;
channel ^. incomingReliableSequenceNumber := 0;
channel ^. incomingUnreliableSequenceNumber := 0;
enet_list_clear (@ channel ^. incomingReliableCommands);
enet_list_clear (@ channel ^. incomingUnreliableCommands);
channel ^. usedReliableWindows := 0;
FillChar(channel ^. reliableWindows, sizeof (channel ^. reliableWindows), 0);
inc(channel);
end;
mtu := ENET_NET_TO_HOST_32 (command ^. connect.mtu);
if (mtu < ENET_PROTOCOL_MINIMUM_MTU) then
mtu := ENET_PROTOCOL_MINIMUM_MTU
else
if (mtu > ENET_PROTOCOL_MAXIMUM_MTU) then
mtu := ENET_PROTOCOL_MAXIMUM_MTU;
Peer ^. mtu := mtu;
if (host ^. outgoingBandwidth = 0) and
(Peer ^. incomingBandwidth = 0) then
Peer ^. windowSize := ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE
else
if (host ^. outgoingBandwidth = 0) or
(Peer ^. incomingBandwidth = 0) then
Peer ^. windowSize := (ENET_MAX (host ^. outgoingBandwidth, Peer ^. incomingBandwidth) div
ENET_PEER_WINDOW_SIZE_SCALE) *
ENET_PROTOCOL_MINIMUM_WINDOW_SIZE
else
Peer ^. windowSize := (ENET_MIN (host ^. outgoingBandwidth, Peer ^. incomingBandwidth) div
ENET_PEER_WINDOW_SIZE_SCALE) *
ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
if (Peer ^. windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE) then
Peer ^. windowSize := ENET_PROTOCOL_MINIMUM_WINDOW_SIZE
else
if (Peer ^. windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE) then
Peer ^. windowSize := ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
if (host ^. incomingBandwidth = 0) then
windowSize := ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE
else
windowSize := (host ^. incomingBandwidth div ENET_PEER_WINDOW_SIZE_SCALE) *
ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
if (windowSize > ENET_NET_TO_HOST_32 (command ^. connect.windowSize)) then
windowSize := ENET_NET_TO_HOST_32 (command ^. connect.windowSize);
if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE) then
windowSize := ENET_PROTOCOL_MINIMUM_WINDOW_SIZE
else
if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE) then
windowSize := ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
verifyCommand.header.command := ENET_PROTOCOL_COMMAND_VERIFY_CONNECT or ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
verifyCommand.header.channelID := $FF;
verifyCommand.verifyConnect.outgoingPeerID := ENET_HOST_TO_NET_16 (Peer ^. incomingPeerID);
verifyCommand.verifyConnect.incomingSessionID := incomingSessionID;
verifyCommand.verifyConnect.outgoingSessionID := outgoingSessionID;
verifyCommand.verifyConnect.mtu := ENET_HOST_TO_NET_32 (Peer ^. mtu);
verifyCommand.verifyConnect.windowSize := ENET_HOST_TO_NET_32 (windowSize);
verifyCommand.verifyConnect.channelCount := ENET_HOST_TO_NET_32 (channelCount);
verifyCommand.verifyConnect.incomingBandwidth := ENET_HOST_TO_NET_32 (host ^. incomingBandwidth);
verifyCommand.verifyConnect.outgoingBandwidth := ENET_HOST_TO_NET_32 (host ^. outgoingBandwidth);
verifyCommand.verifyConnect.packetThrottleInterval := ENET_HOST_TO_NET_32 (Peer ^. packetThrottleInterval);
verifyCommand.verifyConnect.packetThrottleAcceleration := ENET_HOST_TO_NET_32 (Peer ^. packetThrottleAcceleration);
verifyCommand.verifyConnect.packetThrottleDeceleration := ENET_HOST_TO_NET_32 (Peer ^. packetThrottleDeceleration);
verifyCommand.verifyConnect.connectID := Peer ^. connectID;
enet_peer_queue_outgoing_command (Peer, @ verifyCommand, nil, 0, 0);
result := Peer;
end;
function enet_protocol_handle_send_reliable (host : pENetHost; peer : pENetPeer; command : pENetProtocol; currentData : ppenet_uint8):integer;
var
dataLength : enet_size_t;
begin
if (command ^. header.channelID >= peer ^. channelCount) or
((peer ^. state <> ENET_PEER_STATE_CONNECTED) and (peer ^. state <> ENET_PEER_STATE_DISCONNECT_LATER)) then
begin result := -1; exit; end;
dataLength := ENET_NET_TO_HOST_16 (command ^. sendReliable.dataLength);
Inc(PChar(currentData^) , dataLength);
if (dataLength > host ^. maximumPacketSize) or
(currentData^ < host ^. receivedData) or
(currentData^ > @ penet_uint8array(host ^. receivedData)[host ^. receivedDataLength]) then
begin result := -1; exit; end;
if (enet_peer_queue_incoming_command (peer, command, pchar(command) + sizeof (ENetProtocolSendReliable), dataLength, ENET_PACKET_FLAG_RELIABLE, 0) = nil) then
begin result := -1; exit; end;
result := 0;
end;
function enet_protocol_handle_send_unsequenced (host : pENetHost; peer : pENetPeer; command : pENetProtocol; currentData : ppenet_uint8):integer;
var
unsequencedGroup, index : enet_uint32;
dataLength : enet_size_t;
begin
if (command ^. header.channelID >= peer ^. channelCount) or
((peer ^. state <> ENET_PEER_STATE_CONNECTED) and (peer ^. state <> ENET_PEER_STATE_DISCONNECT_LATER)) then
begin result := -1; exit; end;
dataLength := ENET_NET_TO_HOST_16 (command ^. sendUnsequenced.dataLength);
inc(PChar(currentData^) , dataLength);
if (dataLength > host ^. maximumPacketSize) or
(currentData^ < host ^. receivedData) or
(currentData^ > @ penet_uint8array(host ^. receivedData)[host ^. receivedDataLength]) then
begin result := -1; exit; end;
unsequencedGroup := ENET_NET_TO_HOST_16 (command ^. sendUnsequenced.unsequencedGroup);
index := unsequencedGroup mod ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
if (unsequencedGroup < peer ^. incomingUnsequencedGroup) then
inc(unsequencedGroup , $10000);
if (unsequencedGroup >= enet_uint32(peer ^. incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE)) then
begin result := 0; exit; end;
unsequencedGroup := unsequencedGroup and $FFFF;
if ((unsequencedGroup - index) <> peer ^. incomingUnsequencedGroup) then
begin
peer ^. incomingUnsequencedGroup := unsequencedGroup - index;
FillChar (peer ^. unsequencedWindow, sizeof (peer ^. unsequencedWindow), 0);
end
else
if 0<>(peer ^. unsequencedWindow [index div 32] and (1 shl (index mod 32))) then
begin result := 0; exit; end;
if (enet_peer_queue_incoming_command (peer, command, pchar(command) + sizeof (ENetProtocolSendUnsequenced), dataLength, ENET_PACKET_FLAG_UNSEQUENCED, 0) = nil) then
begin result := -1; exit; end;
peer ^. unsequencedWindow [index div 32] := peer ^. unsequencedWindow [index div 32] or enet_uint32(1 shl (index mod 32));
result := 0;
end;
function enet_protocol_handle_send_unreliable (host : pENetHost; peer : pENetPeer;command : pENetProtocol;currentData : ppenet_uint8):integer;
var
dataLength : enet_size_t;
begin
if (command ^. header.channelID >= peer ^. channelCount) or
((peer ^. state <> ENET_PEER_STATE_CONNECTED) and (peer ^. state <> ENET_PEER_STATE_DISCONNECT_LATER)) then
begin result := -1; exit; end;
dataLength := ENET_NET_TO_HOST_16 (command ^. sendUnreliable.dataLength);
inc(PChar(currentData^), dataLength);
if (dataLength > host ^. maximumPacketSize) or
(currentData^ < host ^. receivedData) or
(currentData^ > @ penet_uint8array(host ^. receivedData)[host ^. receivedDataLength]) then
begin result := -1; exit; end;
if (enet_peer_queue_incoming_command (peer, command, pchar(command) + sizeof (ENetProtocolSendUnreliable), dataLength, 0, 0) = nil) then
begin result:=-1; exit; end;
result := 0;
end;
function enet_protocol_handle_send_fragment (host : pENetHost; peer : pENetPeer; command : pENetProtocol; currentData : ppenet_uint8):integer;
var
fragmentNumber , fragmentCount, fragmentOffset, fragmentLength,
startSequenceNumber, totalLength : enet_uint32;
channel : pENetChannel;
startWindow, currentWindow : enet_uint16;
currentCommand : ENetListIterator;
startCommand : pENetIncomingCommand;
packet : pENetPacket;
hostCommand : ENetProtocol;
incomingCommand : pENetIncomingCommand;
label continuework1;
begin
startCommand := nil;
if (command ^. header.channelID >= peer ^. channelCount) or
((peer ^. state <> ENET_PEER_STATE_CONNECTED) and (peer ^. state <> ENET_PEER_STATE_DISCONNECT_LATER)) then
begin result := -1; exit; end;
fragmentLength := ENET_NET_TO_HOST_16 (command ^. sendFragment.dataLength);
inc( currentData^ , fragmentLength);
if (fragmentLength > host ^. maximumPacketSize) or
(currentData^ < host ^. receivedData) or
(currentData^ > @ penet_uint8array(host ^. receivedData)[host ^. receivedDataLength]) then
begin result := -1; exit; end;
channel := @ pENetChannelArray(peer ^. channels)^[command ^. header.channelID];
startSequenceNumber := ENET_NET_TO_HOST_16 (command ^. sendFragment.startSequenceNumber);
startWindow := startSequenceNumber div ENET_PEER_RELIABLE_WINDOW_SIZE;
currentWindow := channel ^. incomingReliableSequenceNumber div ENET_PEER_RELIABLE_WINDOW_SIZE;
if (startSequenceNumber < channel ^. incomingReliableSequenceNumber) then
inc(startWindow , ENET_PEER_RELIABLE_WINDOWS);
if (startWindow < currentWindow) or (startWindow >= (currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1)) then
begin result := 0; exit; end;
fragmentNumber := ENET_NET_TO_HOST_32 (command ^. sendFragment.fragmentNumber);
fragmentCount := ENET_NET_TO_HOST_32 (command ^. sendFragment.fragmentCount);
fragmentOffset := ENET_NET_TO_HOST_32 (command ^. sendFragment.fragmentOffset);
totalLength := ENET_NET_TO_HOST_32 (command ^. sendFragment.totalLength);
if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT) or
(fragmentNumber >= fragmentCount) or
(totalLength > host ^. maximumPacketSize) or
(fragmentOffset >= totalLength) or
(fragmentLength > totalLength - fragmentOffset) then
begin result := -1; exit; end;
currentCommand := enet_list_previous (enet_list_end (@channel ^. incomingReliableCommands));
while PChar(currentCommand) <> PChar(enet_list_end (@ channel ^. incomingReliableCommands)) do
begin
incomingCommand := pENetIncomingCommand(currentCommand);
if (startSequenceNumber >= channel ^. incomingReliableSequenceNumber) then
begin
if (incomingCommand ^. reliableSequenceNumber < channel ^. incomingReliableSequenceNumber) then
goto continuework1;
end
else
if (incomingCommand ^. reliableSequenceNumber >= channel ^. incomingReliableSequenceNumber) then
break;
if (incomingCommand ^. reliableSequenceNumber <= startSequenceNumber) then
begin
if (incomingCommand ^. reliableSequenceNumber < startSequenceNumber) then
break;
if ((incomingCommand ^. command.header.command and ENET_PROTOCOL_COMMAND_MASK) <> ENET_PROTOCOL_COMMAND_SEND_FRAGMENT) or
(totalLength <> incomingCommand ^. packet ^. dataLength) or
(fragmentCount <> incomingCommand ^. fragmentCount) then
begin result := -1; exit; end;
startCommand := incomingCommand;
break;
end;
continuework1:
currentCommand := enet_list_previous (currentCommand);
end;
if (startCommand = nil) then
begin
hostCommand := command^;
hostCommand.header.reliableSequenceNumber := startSequenceNumber;
startCommand := enet_peer_queue_incoming_command (peer, @ hostCommand, nil, totalLength, ENET_PACKET_FLAG_RELIABLE, fragmentCount);
if (startCommand = nil) then
begin result := -1; exit; end;
end;
if enet_uint32(pIntegerArray(startCommand ^. fragments)^[fragmentNumber div 32]) and (1 shl (fragmentNumber mod 32)) = 0 then
begin
dec(startCommand ^. fragmentsRemaining);
PIntegerArray(startCommand ^. fragments)^[fragmentNumber div 32] := PIntegerArray(startCommand ^. fragments)^[fragmentNumber div 32] or (1 shl (fragmentNumber mod 32));
if (fragmentOffset + fragmentLength > startCommand ^. packet ^. dataLength) then
fragmentLength := startCommand ^. packet ^. dataLength - fragmentOffset;
system.Move ((PChar(command) + sizeof (ENetProtocolSendFragment))^,
(PChar(startCommand ^. packet ^. data) + fragmentOffset)^,
fragmentLength);
if (startCommand ^. fragmentsRemaining <= 0) then
enet_peer_dispatch_incoming_reliable_commands (peer, channel);
end;
result := 0;
end;
function enet_protocol_handle_send_unreliable_fragment (host:pENetHost; peer:pENetPeer; command : pENetProtocol; currentData : ppenet_uint8):Integer;
var
fragmentNumber,
fragmentCount,
fragmentOffset,
fragmentLength,
reliableSequenceNumber,
startSequenceNumber,
totalLength : enet_uint32;
reliableWindow, currentWindow : enet_uint16;
channel : pENetChannel;
currentCommand : ENetListIterator;
startCommand : pENetIncomingCommand;
incomingCommand : pENetIncomingCommand;
packet : pENetPacket;
label continue1;
begin
startCommand := nil;
if (command ^. header.channelID >= peer ^. channelCount) or
((peer ^. state <> ENET_PEER_STATE_CONNECTED) and (peer ^. state <> ENET_PEER_STATE_DISCONNECT_LATER))
then begin
Result:=-1; exit;
end;
fragmentLength := ENET_NET_TO_HOST_16 (command ^. sendFragment.dataLength);
Inc(currentData^, fragmentLength);
if (fragmentLength > host ^. maximumPacketSize) or
(currentData^ < host ^. receivedData) or
(currentData^ > @ penet_uint8array(host ^. receivedData )[host ^. receivedDataLength]) then
begin
Result:=-1; exit;
end;
channel := @ peer ^. channels [command ^. header.channelID];
reliableSequenceNumber := command ^. header.reliableSequenceNumber;
startSequenceNumber := ENET_NET_TO_HOST_16 (command ^. sendFragment.startSequenceNumber);
reliableWindow := reliableSequenceNumber div ENET_PEER_RELIABLE_WINDOW_SIZE;
currentWindow := channel ^. incomingReliableSequenceNumber div ENET_PEER_RELIABLE_WINDOW_SIZE;
if (reliableSequenceNumber < channel ^. incomingReliableSequenceNumber) then
Inc(reliableWindow , ENET_PEER_RELIABLE_WINDOWS);
if (reliableWindow < currentWindow) or (reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1) then
begin
Result:=0; exit;
end;
if (reliableSequenceNumber = channel ^. incomingReliableSequenceNumber) and
(startSequenceNumber <= channel ^. incomingUnreliableSequenceNumber) then
begin
Result:=0; exit;
end;
fragmentNumber := ENET_NET_TO_HOST_32 (command ^. sendFragment.fragmentNumber);
fragmentCount := ENET_NET_TO_HOST_32 (command ^. sendFragment.fragmentCount);
fragmentOffset := ENET_NET_TO_HOST_32 (command ^. sendFragment.fragmentOffset);
totalLength := ENET_NET_TO_HOST_32 (command ^. sendFragment.totalLength);
if (fragmentCount > ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT) or
(fragmentNumber >= fragmentCount) or
(totalLength > host ^. maximumPacketSize) or
(fragmentOffset >= totalLength) or
(fragmentLength > totalLength - fragmentOffset) then
begin
Result:=-1; exit;
end;
currentCommand := enet_list_previous (enet_list_end (@ channel ^. incomingUnreliableCommands));
while (currentCommand <> enet_list_end (@ channel ^. incomingUnreliableCommands)) do
begin
incomingCommand := pENetIncomingCommand ( currentCommand );
if (reliableSequenceNumber >= channel ^. incomingReliableSequenceNumber) then
begin
if (incomingCommand ^. reliableSequenceNumber < channel ^. incomingReliableSequenceNumber) then
goto continue1;
end
else
if (incomingCommand ^. reliableSequenceNumber >= channel ^. incomingReliableSequenceNumber) then
break;
if (incomingCommand ^. reliableSequenceNumber < reliableSequenceNumber) then
break;
if (incomingCommand ^. reliableSequenceNumber > reliableSequenceNumber) then
goto continue1;
if (incomingCommand ^. unreliableSequenceNumber <= startSequenceNumber) then
begin
if (incomingCommand ^. unreliableSequenceNumber < startSequenceNumber) then
break;
if ((incomingCommand ^. command.header.command and ENET_PROTOCOL_COMMAND_MASK) <> ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT) or
(totalLength <> incomingCommand ^. packet ^. dataLength) or
(fragmentCount <> incomingCommand ^. fragmentCount) then
begin
Result:=-1; exit;
end;
startCommand := incomingCommand;
break;
end;
continue1:
currentCommand := enet_list_previous (currentCommand);
end;
if (startCommand = nil) then
begin
startCommand := enet_peer_queue_incoming_command (peer, command, nil, totalLength, ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT, fragmentCount);
if (startCommand = nil) then
begin
Result:=-1; exit;
end;
end;
if ((PIntegerArray(startCommand ^. fragments)^ [fragmentNumber div 32] and (1 shl (fragmentNumber mod 32))) = 0) then
begin
Dec( startCommand ^. fragmentsRemaining);
PIntegerArray(startCommand ^. fragments)^[fragmentNumber div 32] := PIntegerArray(startCommand ^. fragments)^[fragmentNumber div 32] or (1 shl (fragmentNumber mod 32));
if (fragmentOffset + fragmentLength > startCommand ^. packet ^. dataLength) then
fragmentLength := startCommand ^. packet ^. dataLength - fragmentOffset;
system.Move((PChar(command) + sizeof (ENetProtocolSendFragment))^,
(PChar(startCommand ^. packet ^. data) + fragmentOffset)^,
fragmentLength);
if (startCommand ^. fragmentsRemaining <= 0) then
enet_peer_dispatch_incoming_unreliable_commands (peer, channel);
end;
Result:=0;
end;
function enet_protocol_handle_ping (host : pENetHost; peer : pENetPeer; command : pENetProtocol):integer;
begin
if (peer ^. state <> ENET_PEER_STATE_CONNECTED) and (peer ^. state <> ENET_PEER_STATE_DISCONNECT_LATER) then
begin
Result:=-1; exit;
end;
result := 0;
end;
function enet_protocol_handle_bandwidth_limit (host : pENetHost; peer : pENetPeer; command : pENetProtocol):integer;
begin
if (peer ^. state <> ENET_PEER_STATE_CONNECTED) and (peer ^. state <> ENET_PEER_STATE_DISCONNECT_LATER) then
begin
Result:=-1; exit;
end;
if (peer ^. incomingBandwidth <> 0) then
Dec(host ^. bandwidthLimitedPeers);
peer ^. incomingBandwidth := ENET_NET_TO_HOST_32 (command ^. bandwidthLimit.incomingBandwidth);
peer ^. outgoingBandwidth := ENET_NET_TO_HOST_32 (command ^. bandwidthLimit.outgoingBandwidth);
if (peer ^. incomingBandwidth <> 0) then
Inc(host ^. bandwidthLimitedPeers);
if (peer ^. incomingBandwidth = 0) and (host ^. outgoingBandwidth = 0) then
peer ^. windowSize := ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE
else
if (peer ^. incomingBandwidth = 0) or (host ^. outgoingBandwidth = 0) then
peer ^. windowSize := (ENET_MAX (peer ^. incomingBandwidth, host ^. outgoingBandwidth) div
ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE
else
peer ^. windowSize := (ENET_MIN (peer ^. incomingBandwidth, host ^. outgoingBandwidth) div
ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
if (peer ^. windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE) then
peer ^. windowSize := ENET_PROTOCOL_MINIMUM_WINDOW_SIZE
else
if (peer ^. windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE) then
peer ^. windowSize := ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
result := 0;
end;
function enet_protocol_handle_throttle_configure (host : pENetHost; peer : pENetPeer; command : pENetProtocol):integer;
begin
if (peer ^. state <> ENET_PEER_STATE_CONNECTED) and (peer ^. state <> ENET_PEER_STATE_DISCONNECT_LATER) then
begin
Result:=-1; exit;
end;
peer ^. packetThrottleInterval := ENET_NET_TO_HOST_32 (command ^. throttleConfigure.packetThrottleInterval);
peer ^. packetThrottleAcceleration := ENET_NET_TO_HOST_32 (command ^. throttleConfigure.packetThrottleAcceleration);
peer ^. packetThrottleDeceleration := ENET_NET_TO_HOST_32 (command ^. throttleConfigure.packetThrottleDeceleration);
result := 0;
end;
function enet_protocol_handle_disconnect (host : pENetHost; peer : pENetPeer; command : pENetProtocol):integer;
begin
if (peer ^. state = ENET_PEER_STATE_DISCONNECTED) or (peer ^. state = ENET_PEER_STATE_ZOMBIE) or (peer ^. state = ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT) then
begin
Result:=0; exit;
end;
enet_peer_reset_queues (peer);
if ((peer ^. state = ENET_PEER_STATE_CONNECTION_SUCCEEDED) or (peer ^. state = ENET_PEER_STATE_DISCONNECTING) or (peer ^. state = ENET_PEER_STATE_CONNECTING)) then
enet_protocol_dispatch_state (host, peer, ENET_PEER_STATE_ZOMBIE)
else
if (peer ^. state <> ENET_PEER_STATE_CONNECTED) and (peer ^. state <> ENET_PEER_STATE_DISCONNECT_LATER) then
begin
if (peer ^. state = ENET_PEER_STATE_CONNECTION_PENDING) then host ^. recalculateBandwidthLimits := 1;
enet_peer_reset (peer);
end
else
if (command ^. header.command and ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)<>0 then
enet_protocol_change_state (host, peer, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT)
else
enet_protocol_dispatch_state (host, peer, ENET_PEER_STATE_ZOMBIE);
if (peer ^. state <> ENET_PEER_STATE_DISCONNECTED) then
peer ^. eventData := ENET_NET_TO_HOST_32 (command ^. disconnect.data);
result := 0;
end;
function enet_protocol_handle_acknowledge (host : pENetHost; event : pENetEvent; peer : pENetPeer; command : pENetProtocol):integer;
var
roundTripTime, receivedSentTime, receivedReliableSequenceNumber : enet_uint32;
commandNumber : ENetProtocolCommand;
begin
if (peer ^. state = ENET_PEER_STATE_DISCONNECTED) or (peer ^. state = ENET_PEER_STATE_ZOMBIE) then
begin
Result:=0; exit;
end;
receivedSentTime := ENET_NET_TO_HOST_16 (command ^. acknowledge.receivedSentTime);
receivedSentTime := receivedSentTime or (host ^. serviceTime and $FFFF0000);
if ((receivedSentTime and $8000) > (host ^. serviceTime and $8000)) then
dec(receivedSentTime , $10000);
if (ENET_TIME_LESS (host ^. serviceTime, receivedSentTime)) then
begin result := 0; exit; end;
peer ^. lastReceiveTime := host ^. serviceTime;
peer ^. earliestTimeout := 0;
roundTripTime := ENET_TIME_DIFFERENCE (host ^. serviceTime, receivedSentTime);
enet_peer_throttle (peer, roundTripTime);
dec(peer ^. roundTripTimeVariance , peer ^. roundTripTimeVariance div 4);
if (roundTripTime >= peer ^. roundTripTime) then
begin
inc(peer ^. roundTripTime , (roundTripTime - peer ^. roundTripTime) div 8);
inc(peer ^. roundTripTimeVariance , (roundTripTime - peer ^. roundTripTime) div 4);
end
else
begin
dec(peer ^. roundTripTime , (peer ^. roundTripTime - roundTripTime) div 8);
inc(peer ^. roundTripTimeVariance , (peer ^. roundTripTime - roundTripTime) div 4);
end;
if (peer ^. roundTripTime < peer ^. lowestRoundTripTime) then
peer ^. lowestRoundTripTime := peer ^. roundTripTime;
if (peer ^. roundTripTimeVariance > peer ^. highestRoundTripTimeVariance) then
peer ^. highestRoundTripTimeVariance := peer ^. roundTripTimeVariance;
if (peer ^. packetThrottleEpoch = 0) or
(ENET_TIME_DIFFERENCE (host ^. serviceTime, peer ^. packetThrottleEpoch) >= peer ^. packetThrottleInterval) then
begin
peer ^. lastRoundTripTime := peer ^. lowestRoundTripTime;
peer ^. lastRoundTripTimeVariance := peer ^. highestRoundTripTimeVariance;
peer ^. lowestRoundTripTime := peer ^. roundTripTime;
peer ^. highestRoundTripTimeVariance := peer ^. roundTripTimeVariance;
peer ^. packetThrottleEpoch := host ^. serviceTime;
end;
receivedReliableSequenceNumber := ENET_NET_TO_HOST_16 (command ^. acknowledge.receivedReliableSequenceNumber);
commandNumber := enet_protocol_remove_sent_reliable_command (peer, receivedReliableSequenceNumber, command ^. header.channelID);
case peer ^. state of
ENET_PEER_STATE_ACKNOWLEDGING_CONNECT: begin
if (commandNumber <> ENET_PROTOCOL_COMMAND_VERIFY_CONNECT) then
begin result := -1; exit; end;
enet_protocol_notify_connect (host, peer, event);
end; // break;
ENET_PEER_STATE_DISCONNECTING: begin
if (commandNumber <> ENET_PROTOCOL_COMMAND_DISCONNECT) then
begin result := -1; exit; end;
enet_protocol_notify_disconnect (host, peer, event);
end; // break;
ENET_PEER_STATE_DISCONNECT_LATER: begin
if (enet_list_empty (@ peer ^. outgoingReliableCommands) and
enet_list_empty (@ peer ^. outgoingUnreliableCommands) and
enet_list_empty (@ peer ^. sentReliableCommands)) then
enet_peer_disconnect (peer, peer ^. eventData);
end; // break
else ;
end;