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- /**
- @file protocol.c
- @brief ENet protocol functions
- */
- #include <stdio.h>
- #include <string.h>
- #define ENET_BUILDING_LIB 1
- #include "enet/utility.h"
- #include "enet/time.h"
- #include "enet/enet.h"
-
- static enet_uint32 timeCurrent;
-
- static size_t commandSizes [ENET_PROTOCOL_COMMAND_COUNT] =
- {
- 0,
- sizeof (ENetProtocolAcknowledge),
- sizeof (ENetProtocolConnect),
- sizeof (ENetProtocolVerifyConnect),
- sizeof (ENetProtocolDisconnect),
- sizeof (ENetProtocolPing),
- sizeof (ENetProtocolSendReliable),
- sizeof (ENetProtocolSendUnreliable),
- sizeof (ENetProtocolSendFragment),
- sizeof (ENetProtocolSendUnsequenced),
- sizeof (ENetProtocolBandwidthLimit),
- sizeof (ENetProtocolThrottleConfigure),
- };
-
- size_t
- enet_protocol_command_size (enet_uint8 commandNumber)
- {
- return commandSizes [commandNumber & ENET_PROTOCOL_COMMAND_MASK];
- }
-
- static int
- enet_protocol_dispatch_incoming_commands (ENetHost * host, ENetEvent * event)
- {
- ENetPeer * currentPeer = host -> lastServicedPeer;
- ENetChannel * channel;
-
- do
- {
- ++ currentPeer;
-
- if (currentPeer >= & host -> peers [host -> peerCount])
- currentPeer = host -> peers;
-
- switch (currentPeer -> state)
- {
- case ENET_PEER_STATE_CONNECTION_PENDING:
- case ENET_PEER_STATE_CONNECTION_SUCCEEDED:
- currentPeer -> state = ENET_PEER_STATE_CONNECTED;
-
- event -> type = ENET_EVENT_TYPE_CONNECT;
- event -> peer = currentPeer;
-
- return 1;
-
- case ENET_PEER_STATE_ZOMBIE:
- host -> recalculateBandwidthLimits = 1;
-
- event -> type = ENET_EVENT_TYPE_DISCONNECT;
- event -> peer = currentPeer;
- event -> data = currentPeer -> disconnectData;
-
- enet_peer_reset (currentPeer);
-
- host -> lastServicedPeer = currentPeer;
-
- return 1;
- }
-
- if (currentPeer -> state != ENET_PEER_STATE_CONNECTED)
- continue;
-
- for (channel = currentPeer -> channels;
- channel < & currentPeer -> channels [currentPeer -> channelCount];
- ++ channel)
- {
- if (enet_list_empty (& channel -> incomingReliableCommands) &&
- enet_list_empty (& channel -> incomingUnreliableCommands))
- continue;
-
- event -> packet = enet_peer_receive (currentPeer, channel - currentPeer -> channels);
- if (event -> packet == NULL)
- continue;
-
- event -> type = ENET_EVENT_TYPE_RECEIVE;
- event -> peer = currentPeer;
- event -> channelID = (enet_uint8) (channel - currentPeer -> channels);
-
- host -> lastServicedPeer = currentPeer;
-
- return 1;
- }
- } while (currentPeer != host -> lastServicedPeer);
-
- return 0;
- }
-
- static void
- enet_protocol_notify_connect (ENetHost * host, ENetPeer * peer, ENetEvent * event)
- {
- host -> recalculateBandwidthLimits = 1;
-
- if (event == NULL)
- peer -> state = (peer -> state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING);
- else
- {
- peer -> state = ENET_PEER_STATE_CONNECTED;
-
- event -> type = ENET_EVENT_TYPE_CONNECT;
- event -> peer = peer;
- }
- }
-
- static void
- enet_protocol_notify_disconnect (ENetHost * host, ENetPeer * peer, ENetEvent * event)
- {
- if (peer -> state >= ENET_PEER_STATE_CONNECTION_PENDING)
- host -> recalculateBandwidthLimits = 1;
-
- if (peer -> state != ENET_PEER_STATE_CONNECTING && peer -> state < ENET_PEER_STATE_CONNECTION_SUCCEEDED)
- enet_peer_reset (peer);
- else
- if (event == NULL)
- peer -> state = ENET_PEER_STATE_ZOMBIE;
- else
- {
- event -> type = ENET_EVENT_TYPE_DISCONNECT;
- event -> peer = peer;
- event -> data = 0;
-
- enet_peer_reset (peer);
- }
- }
-
- static void
- enet_protocol_remove_sent_unreliable_commands (ENetPeer * peer)
- {
- ENetOutgoingCommand * outgoingCommand;
-
- while (! enet_list_empty (& peer -> sentUnreliableCommands))
- {
- outgoingCommand = (ENetOutgoingCommand *) enet_list_front (& peer -> sentUnreliableCommands);
-
- enet_list_remove (& outgoingCommand -> outgoingCommandList);
-
- if (outgoingCommand -> packet != NULL)
- {
- -- outgoingCommand -> packet -> referenceCount;
-
- if (outgoingCommand -> packet -> referenceCount == 0)
- enet_packet_destroy (outgoingCommand -> packet);
- }
-
- enet_free (outgoingCommand);
- }
- }
-
- static ENetProtocolCommand
- enet_protocol_remove_sent_reliable_command (ENetPeer * peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID)
- {
- ENetOutgoingCommand * outgoingCommand;
- ENetListIterator currentCommand;
- ENetProtocolCommand commandNumber;
-
- for (currentCommand = enet_list_begin (& peer -> sentReliableCommands);
- currentCommand != enet_list_end (& peer -> sentReliableCommands);
- currentCommand = enet_list_next (currentCommand))
- {
- outgoingCommand = (ENetOutgoingCommand *) currentCommand;
-
- if (outgoingCommand -> reliableSequenceNumber == reliableSequenceNumber &&
- outgoingCommand -> command.header.channelID == channelID)
- break;
- }
-
- if (currentCommand == enet_list_end (& peer -> sentReliableCommands))
- return ENET_PROTOCOL_COMMAND_NONE;
-
- commandNumber = outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_MASK;
-
- enet_list_remove (& outgoingCommand -> outgoingCommandList);
-
- if (outgoingCommand -> packet != NULL)
- {
- peer -> reliableDataInTransit -= outgoingCommand -> fragmentLength;
-
- -- outgoingCommand -> packet -> referenceCount;
-
- if (outgoingCommand -> packet -> referenceCount == 0)
- enet_packet_destroy (outgoingCommand -> packet);
- }
-
- enet_free (outgoingCommand);
-
- if (enet_list_empty (& peer -> sentReliableCommands))
- return commandNumber;
-
- outgoingCommand = (ENetOutgoingCommand *) enet_list_front (& peer -> sentReliableCommands);
-
- peer -> nextTimeout = outgoingCommand -> sentTime + outgoingCommand -> roundTripTimeout;
-
- return commandNumber;
- }
-
- static ENetPeer *
- enet_protocol_handle_connect (ENetHost * host, ENetProtocolHeader * header, ENetProtocol * command)
- {
- enet_uint16 mtu;
- enet_uint32 windowSize;
- ENetChannel * channel;
- size_t channelCount;
- ENetPeer * currentPeer;
- ENetProtocol verifyCommand;
-
- #ifdef USE_CRC32
- {
- enet_uint32 crc = header -> checksum;
- ENetBuffer buffer;
-
- command -> header.reliableSequenceNumber = ENET_HOST_TO_NET_16 (command -> header.reliableSequenceNumber);
-
- header -> checksum = command -> connect.sessionID;
-
- buffer.data = host -> receivedData;
- buffer.dataLength = host -> receivedDataLength;
-
- if (enet_crc32 (& buffer, 1) != crc)
- return NULL;
-
- command -> header.reliableSequenceNumber = ENET_NET_TO_HOST_16 (command -> header.reliableSequenceNumber);
- }
- #endif
-
- channelCount = ENET_NET_TO_HOST_32 (command -> connect.channelCount);
-
- if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT ||
- channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT)
- return NULL;
-
- for (currentPeer = host -> peers;
- currentPeer < & host -> peers [host -> peerCount];
- ++ currentPeer)
- {
- if (currentPeer -> state != ENET_PEER_STATE_DISCONNECTED &&
- currentPeer -> address.host == host -> receivedAddress.host &&
- currentPeer -> address.port == host -> receivedAddress.port &&
- currentPeer -> sessionID == command -> connect.sessionID)
- return NULL;
- }
-
- for (currentPeer = host -> peers;
- currentPeer < & host -> peers [host -> peerCount];
- ++ currentPeer)
- {
- if (currentPeer -> state == ENET_PEER_STATE_DISCONNECTED)
- break;
- }
-
- if (currentPeer >= & host -> peers [host -> peerCount])
- return NULL;
-
- currentPeer -> state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
- currentPeer -> sessionID = command -> connect.sessionID;
- currentPeer -> address = host -> receivedAddress;
- currentPeer -> outgoingPeerID = ENET_NET_TO_HOST_16 (command -> connect.outgoingPeerID);
- currentPeer -> incomingBandwidth = ENET_NET_TO_HOST_32 (command -> connect.incomingBandwidth);
- currentPeer -> outgoingBandwidth = ENET_NET_TO_HOST_32 (command -> connect.outgoingBandwidth);
- currentPeer -> packetThrottleInterval = ENET_NET_TO_HOST_32 (command -> connect.packetThrottleInterval);
- currentPeer -> packetThrottleAcceleration = ENET_NET_TO_HOST_32 (command -> connect.packetThrottleAcceleration);
- currentPeer -> packetThrottleDeceleration = ENET_NET_TO_HOST_32 (command -> connect.packetThrottleDeceleration);
- currentPeer -> channels = (ENetChannel *) enet_malloc (channelCount * sizeof (ENetChannel));
- currentPeer -> channelCount = channelCount;
-
- for (channel = currentPeer -> channels;
- channel < & currentPeer -> channels [channelCount];
- ++ channel)
- {
- channel -> outgoingReliableSequenceNumber = 0;
- channel -> outgoingUnreliableSequenceNumber = 0;
- channel -> incomingReliableSequenceNumber = 0;
- channel -> incomingUnreliableSequenceNumber = 0;
-
- enet_list_clear (& channel -> incomingReliableCommands);
- enet_list_clear (& channel -> incomingUnreliableCommands);
- }
-
- mtu = ENET_NET_TO_HOST_16 (command -> connect.mtu);
-
- if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
- mtu = ENET_PROTOCOL_MINIMUM_MTU;
- else
- if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
- mtu = ENET_PROTOCOL_MAXIMUM_MTU;
-
- currentPeer -> mtu = mtu;
-
- if (host -> outgoingBandwidth == 0 &&
- currentPeer -> incomingBandwidth == 0)
- currentPeer -> windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
- else
- currentPeer -> windowSize = (ENET_MIN (host -> outgoingBandwidth, currentPeer -> incomingBandwidth) /
- ENET_PEER_WINDOW_SIZE_SCALE) *
- ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
-
- if (currentPeer -> windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
- currentPeer -> windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
- else
- if (currentPeer -> windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
- currentPeer -> windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
-
- if (host -> incomingBandwidth == 0)
- windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
- else
- windowSize = (host -> incomingBandwidth / ENET_PEER_WINDOW_SIZE_SCALE) *
- ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
-
- if (windowSize > ENET_NET_TO_HOST_32 (command -> connect.windowSize))
- windowSize = ENET_NET_TO_HOST_32 (command -> connect.windowSize);
-
- if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
- windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
- else
- if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
- windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
-
- verifyCommand.header.command = ENET_PROTOCOL_COMMAND_VERIFY_CONNECT | ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE;
- verifyCommand.header.channelID = 0xFF;
- verifyCommand.verifyConnect.outgoingPeerID = ENET_HOST_TO_NET_16 (currentPeer -> incomingPeerID);
- verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_16 (currentPeer -> 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 (currentPeer -> packetThrottleInterval);
- verifyCommand.verifyConnect.packetThrottleAcceleration = ENET_HOST_TO_NET_32 (currentPeer -> packetThrottleAcceleration);
- verifyCommand.verifyConnect.packetThrottleDeceleration = ENET_HOST_TO_NET_32 (currentPeer -> packetThrottleDeceleration);
-
- enet_peer_queue_outgoing_command (currentPeer, & verifyCommand, NULL, 0, 0);
-
- return currentPeer;
- }
-
- static int
- enet_protocol_handle_send_reliable (ENetHost * host, ENetPeer * peer, const ENetProtocol * command, enet_uint8 ** currentData)
- {
- ENetPacket * packet;
- size_t dataLength;
-
- if (command -> header.channelID >= peer -> channelCount ||
- (peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER))
- return -1;
-
- dataLength = ENET_NET_TO_HOST_16 (command -> sendReliable.dataLength);
- * currentData += dataLength;
- if (* currentData > & host -> receivedData [host -> receivedDataLength])
- return -1;
-
- packet = enet_packet_create ((const enet_uint8 *) command + sizeof (ENetProtocolSendReliable),
- dataLength,
- ENET_PACKET_FLAG_RELIABLE);
- if (packet == NULL)
- return -1;
-
- enet_peer_queue_incoming_command (peer, command, packet, 0);
- return 0;
- }
-
- static int
- enet_protocol_handle_send_unsequenced (ENetHost * host, ENetPeer * peer, const ENetProtocol * command, enet_uint8 ** currentData)
- {
- ENetPacket * packet;
- enet_uint32 unsequencedGroup, index;
- size_t dataLength;
-
- if (command -> header.channelID >= peer -> channelCount ||
- (peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER))
- return -1;
-
- dataLength = ENET_NET_TO_HOST_16 (command -> sendUnsequenced.dataLength);
- * currentData += dataLength;
- if (* currentData > & host -> receivedData [host -> receivedDataLength])
- return -1;
-
- unsequencedGroup = ENET_NET_TO_HOST_16 (command -> sendUnsequenced.unsequencedGroup);
- index = unsequencedGroup % ENET_PEER_UNSEQUENCED_WINDOW_SIZE;
-
- if (unsequencedGroup >= peer -> incomingUnsequencedGroup + ENET_PEER_UNSEQUENCED_WINDOW_SIZE ||
- peer -> incomingUnsequencedGroup >= 0xF000 && unsequencedGroup < 0x1000)
- {
- peer -> incomingUnsequencedGroup = unsequencedGroup - index;
-
- memset (peer -> unsequencedWindow, 0, sizeof (peer -> unsequencedWindow));
- }
- else
- if (unsequencedGroup < peer -> incomingUnsequencedGroup ||
- peer -> unsequencedWindow [index / 32] & (1 << (index % 32)))
- return 0;
-
- peer -> unsequencedWindow [index / 32] |= 1 << (index % 32);
-
-
- packet = enet_packet_create ((const enet_uint8 *) command + sizeof (ENetProtocolSendUnsequenced),
- dataLength,
- ENET_PACKET_FLAG_UNSEQUENCED);
- if (packet == NULL)
- return -1;
-
- enet_peer_queue_incoming_command (peer, command, packet, 0);
- return 0;
- }
-
- static int
- enet_protocol_handle_send_unreliable (ENetHost * host, ENetPeer * peer, const ENetProtocol * command, enet_uint8 ** currentData)
- {
- ENetPacket * packet;
- size_t dataLength;
-
- if (command -> header.channelID >= peer -> channelCount ||
- (peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER))
- return -1;
-
- dataLength = ENET_NET_TO_HOST_16 (command -> sendUnreliable.dataLength);
- * currentData += dataLength;
- if (* currentData > & host -> receivedData [host -> receivedDataLength])
- return -1;
-
- packet = enet_packet_create ((const enet_uint8 *) command + sizeof (ENetProtocolSendUnreliable),
- dataLength,
- 0);
- if (packet == NULL)
- return -1;
-
- enet_peer_queue_incoming_command (peer, command, packet, 0);
- return 0;
- }
-
- static int
- enet_protocol_handle_send_fragment (ENetHost * host, ENetPeer * peer, const ENetProtocol * command, enet_uint8 ** currentData)
- {
- enet_uint32 fragmentNumber,
- fragmentCount,
- fragmentOffset,
- fragmentLength,
- startSequenceNumber,
- totalLength;
- ENetChannel * channel;
- ENetListIterator currentCommand;
- ENetIncomingCommand * startCommand;
-
- if (command -> header.channelID >= peer -> channelCount ||
- (peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER))
- return -1;
-
- fragmentLength = ENET_NET_TO_HOST_16 (command -> sendFragment.dataLength);
- * currentData += fragmentLength;
- if (* currentData > & host -> receivedData [host -> receivedDataLength])
- return -1;
-
- channel = & peer -> channels [command -> header.channelID];
- startSequenceNumber = ENET_NET_TO_HOST_16 (command -> sendFragment.startSequenceNumber);
- if (channel -> incomingReliableSequenceNumber >= 0xF000 && startSequenceNumber < 0x1000)
- startSequenceNumber += 0x10000;
-
- if (startSequenceNumber < channel -> incomingReliableSequenceNumber ||
- (channel -> incomingReliableSequenceNumber < 0x1000 && (startSequenceNumber & 0xFFFF) >= 0xF000))
- return 0;
-
- 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 (fragmentOffset >= totalLength ||
- fragmentOffset + fragmentLength > totalLength ||
- fragmentNumber >= fragmentCount)
- return -1;
-
- for (currentCommand = enet_list_previous (enet_list_end (& channel -> incomingReliableCommands));
- currentCommand != enet_list_end (& channel -> incomingReliableCommands);
- currentCommand = enet_list_previous (currentCommand))
- {
- startCommand = (ENetIncomingCommand *) currentCommand;
-
- if ((startCommand -> command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_SEND_FRAGMENT &&
- startCommand -> command.sendFragment.startSequenceNumber == (startSequenceNumber & 0xFFFF))
- break;
- }
-
- if (currentCommand == enet_list_end (& channel -> incomingReliableCommands))
- {
- ENetProtocol hostCommand = * command;
- ENetPacket * packet = enet_packet_create (NULL, totalLength, ENET_PACKET_FLAG_RELIABLE);
- if (packet == NULL)
- return -1;
-
- hostCommand.header.reliableSequenceNumber = startSequenceNumber;
- hostCommand.sendFragment.startSequenceNumber = startSequenceNumber;
- hostCommand.sendFragment.dataLength = fragmentLength;
- hostCommand.sendFragment.fragmentNumber = fragmentNumber;
- hostCommand.sendFragment.fragmentCount = fragmentCount;
- hostCommand.sendFragment.fragmentOffset = fragmentOffset;
- hostCommand.sendFragment.totalLength = totalLength;
-
- startCommand = enet_peer_queue_incoming_command (peer, & hostCommand, packet, fragmentCount);
- }
- else
- if (totalLength != startCommand -> packet -> dataLength ||
- fragmentCount != startCommand -> fragmentCount)
- return -1;
-
- if ((startCommand -> fragments [fragmentNumber / 32] & (1 << (fragmentNumber % 32))) == 0)
- {
- -- startCommand -> fragmentsRemaining;
-
- startCommand -> fragments [fragmentNumber / 32] |= (1 << (fragmentNumber % 32));
-
- if (fragmentOffset + fragmentLength > startCommand -> packet -> dataLength)
- fragmentLength = startCommand -> packet -> dataLength - fragmentOffset;
-
- memcpy (startCommand -> packet -> data + fragmentOffset,
- (enet_uint8 *) command + sizeof (ENetProtocolSendFragment),
- fragmentLength);
- }
-
- return 0;
- }
-
- static int
- enet_protocol_handle_ping (ENetHost * host, ENetPeer * peer, const ENetProtocol * command)
- {
- return 0;
- }
-
- static int
- enet_protocol_handle_bandwidth_limit (ENetHost * host, ENetPeer * peer, const ENetProtocol * command)
- {
- peer -> incomingBandwidth = ENET_NET_TO_HOST_32 (command -> bandwidthLimit.incomingBandwidth);
- peer -> outgoingBandwidth = ENET_NET_TO_HOST_32 (command -> bandwidthLimit.outgoingBandwidth);
-
- if (peer -> incomingBandwidth == 0 && host -> outgoingBandwidth == 0)
- peer -> windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
- else
- peer -> windowSize = (ENET_MIN (peer -> incomingBandwidth, host -> outgoingBandwidth) /
- ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
-
- if (peer -> windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
- peer -> windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
- else
- if (peer -> windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
- peer -> windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
-
- return 0;
- }
-
- static int
- enet_protocol_handle_throttle_configure (ENetHost * host, ENetPeer * peer, const ENetProtocol * command)
- {
- 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);
-
- return 0;
- }
-
- static int
- enet_protocol_handle_disconnect (ENetHost * host, ENetPeer * peer, const ENetProtocol * command)
- {
- enet_peer_reset_queues (peer);
-
- if (peer -> state == ENET_PEER_STATE_CONNECTION_SUCCEEDED)
- peer -> state = ENET_PEER_STATE_ZOMBIE;
- else
- if (peer -> state != ENET_PEER_STATE_CONNECTED && peer -> state != ENET_PEER_STATE_DISCONNECT_LATER)
- {
- if (peer -> state == ENET_PEER_STATE_CONNECTION_PENDING) host -> recalculateBandwidthLimits = 1;
-
- enet_peer_reset (peer);
- }
- else
- if (command -> header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE)
- peer -> state = ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT;
- else
- peer -> state = ENET_PEER_STATE_ZOMBIE;
-
- peer -> disconnectData = ENET_NET_TO_HOST_32 (command -> disconnect.data);
- return 0;
- }
-
- static int
- enet_protocol_handle_acknowledge (ENetHost * host, ENetEvent * event, ENetPeer * peer, const ENetProtocol * command)
- {
- enet_uint32 roundTripTime,
- receivedSentTime,
- receivedReliableSequenceNumber;
- ENetProtocolCommand commandNumber;
-
- receivedSentTime = ENET_NET_TO_HOST_16 (command -> acknowledge.receivedSentTime);
- receivedSentTime |= timeCurrent & 0xFFFF0000;
- if ((receivedSentTime & 0x8000) > (timeCurrent & 0x8000))
- receivedSentTime -= 0x10000;
-
- if (ENET_TIME_LESS (timeCurrent, receivedSentTime))
- return 0;
-
- peer -> lastReceiveTime = timeCurrent;
- peer -> earliestTimeout = 0;
-
- roundTripTime = ENET_TIME_DIFFERENCE (timeCurrent, receivedSentTime);
-
- enet_peer_throttle (peer, roundTripTime);
-
- peer -> roundTripTimeVariance -= peer -> roundTripTimeVariance / 4;
-
- if (roundTripTime >= peer -> roundTripTime)
- {
- peer -> roundTripTime += (roundTripTime - peer -> roundTripTime) / 8;
- peer -> roundTripTimeVariance += (roundTripTime - peer -> roundTripTime) / 4;
- }
- else
- {
- peer -> roundTripTime -= (peer -> roundTripTime - roundTripTime) / 8;
- peer -> roundTripTimeVariance += (peer -> roundTripTime - roundTripTime) / 4;
- }
-
- if (peer -> roundTripTime < peer -> lowestRoundTripTime)
- peer -> lowestRoundTripTime = peer -> roundTripTime;
-
- if (peer -> roundTripTimeVariance > peer -> highestRoundTripTimeVariance)
- peer -> highestRoundTripTimeVariance = peer -> roundTripTimeVariance;
-
- if (peer -> packetThrottleEpoch == 0 ||
- ENET_TIME_DIFFERENCE(timeCurrent, peer -> packetThrottleEpoch) >= peer -> packetThrottleInterval)
- {
- peer -> lastRoundTripTime = peer -> lowestRoundTripTime;
- peer -> lastRoundTripTimeVariance = peer -> highestRoundTripTimeVariance;
- peer -> lowestRoundTripTime = peer -> roundTripTime;
- peer -> highestRoundTripTimeVariance = peer -> roundTripTimeVariance;
- peer -> packetThrottleEpoch = timeCurrent;
- }
-
- receivedReliableSequenceNumber = ENET_NET_TO_HOST_16 (command -> acknowledge.receivedReliableSequenceNumber);
-
- commandNumber = enet_protocol_remove_sent_reliable_command (peer, receivedReliableSequenceNumber, command -> header.channelID);
-
- switch (peer -> state)
- {
- case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
- if (commandNumber != ENET_PROTOCOL_COMMAND_VERIFY_CONNECT)
- return -1;
-
- enet_protocol_notify_connect (host, peer, event);
- break;
-
- case ENET_PEER_STATE_DISCONNECTING:
- if (commandNumber != ENET_PROTOCOL_COMMAND_DISCONNECT)
- return -1;
-
- enet_protocol_notify_disconnect (host, peer, event);
- break;
-
- case ENET_PEER_STATE_DISCONNECT_LATER:
- if (enet_list_empty (& peer -> outgoingReliableCommands) &&
- enet_list_empty (& peer -> outgoingUnreliableCommands) &&
- enet_list_empty (& peer -> sentReliableCommands))
- enet_peer_disconnect (peer, peer -> disconnectData);
- break;
- }
-
- return 0;
- }
-
- static int
- enet_protocol_handle_verify_connect (ENetHost * host, ENetEvent * event, ENetPeer * peer, const ENetProtocol * command)
- {
- enet_uint16 mtu;
- enet_uint32 windowSize;
-
- if (peer -> state != ENET_PEER_STATE_CONNECTING)
- return -1;
-
- if (ENET_NET_TO_HOST_32 (command -> verifyConnect.channelCount) != peer -> channelCount ||
- ENET_NET_TO_HOST_32 (command -> verifyConnect.packetThrottleInterval) != peer -> packetThrottleInterval ||
- ENET_NET_TO_HOST_32 (command -> verifyConnect.packetThrottleAcceleration) != peer -> packetThrottleAcceleration ||
- ENET_NET_TO_HOST_32 (command -> verifyConnect.packetThrottleDeceleration) != peer -> packetThrottleDeceleration)
- {
- peer -> state = ENET_PEER_STATE_ZOMBIE;
-
- return -1;
- }
-
- enet_protocol_remove_sent_reliable_command (peer, 1, 0xFF);
-
- peer -> outgoingPeerID = ENET_NET_TO_HOST_16 (command -> verifyConnect.outgoingPeerID);
-
- mtu = ENET_NET_TO_HOST_16 (command -> verifyConnect.mtu);
-
- if (mtu < ENET_PROTOCOL_MINIMUM_MTU)
- mtu = ENET_PROTOCOL_MINIMUM_MTU;
- else
- if (mtu > ENET_PROTOCOL_MAXIMUM_MTU)
- mtu = ENET_PROTOCOL_MAXIMUM_MTU;
-
- if (mtu < peer -> mtu)
- peer -> mtu = mtu;
-
- windowSize = ENET_NET_TO_HOST_32 (command -> verifyConnect.windowSize);
-
- if (windowSize < ENET_PROTOCOL_MINIMUM_WINDOW_SIZE)
- windowSize = ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
-
- if (windowSize > ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE)
- windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
-
- if (windowSize < peer -> windowSize)
- peer -> windowSize = windowSize;
-
- peer -> incomingBandwidth = ENET_NET_TO_HOST_32 (command -> verifyConnect.incomingBandwidth);
- peer -> outgoingBandwidth = ENET_NET_TO_HOST_32 (command -> verifyConnect.outgoingBandwidth);
-
- enet_protocol_notify_connect (host, peer, event);
- return 0;
- }
-
- static int
- enet_protocol_handle_incoming_commands (ENetHost * host, ENetEvent * event)
- {
- ENetProtocolHeader * header;
- ENetProtocol * command;
- ENetPeer * peer;
- enet_uint8 * currentData;
- size_t headerSize;
- enet_uint16 peerID, flags;
-
- if (host -> receivedDataLength < sizeof (ENetProtocolHeader))
- return 0;
-
- header = (ENetProtocolHeader *) host -> receivedData;
-
- peerID = ENET_NET_TO_HOST_16 (header -> peerID);
- flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK;
- peerID &= ~ ENET_PROTOCOL_HEADER_FLAG_MASK;
-
- if (peerID == ENET_PROTOCOL_MAXIMUM_PEER_ID)
- peer = NULL;
- else
- if (peerID >= host -> peerCount)
- return 0;
- else
- {
- peer = & host -> peers [peerID];
-
- if (peer -> state == ENET_PEER_STATE_DISCONNECTED ||
- peer -> state == ENET_PEER_STATE_ZOMBIE ||
- (host -> receivedAddress.host != peer -> address.host &&
- peer -> address.host != ENET_HOST_BROADCAST))
- return 0;
-
- #ifdef USE_CRC32
- {
- enet_uint32 crc = header -> checksum;
- ENetBuffer buffer;
-
- header -> checksum = peer -> sessionID;
-
- buffer.data = host -> receivedData;
- buffer.dataLength = host -> receivedDataLength;
-
- if (enet_crc32 (& buffer, 1) != crc)
- return 0;
- }
- #else
- if (header -> checksum != peer -> sessionID)
- return 0;
- #endif
-
- peer -> address.host = host -> receivedAddress.host;
- peer -> address.port = host -> receivedAddress.port;
- peer -> incomingDataTotal += host -> receivedDataLength;
- }
-
- headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof (ENetProtocolHeader) : (size_t) & ((ENetProtocolHeader *) 0) -> sentTime);
- currentData = host -> receivedData + headerSize;
-
- while (currentData < & host -> receivedData [host -> receivedDataLength])
- {
- enet_uint8 commandNumber;
- size_t commandSize;
-
- command = (ENetProtocol *) currentData;
-
- if (currentData + sizeof (ENetProtocolCommandHeader) > & host -> receivedData [host -> receivedDataLength])
- break;
-
- commandNumber = command -> header.command & ENET_PROTOCOL_COMMAND_MASK;
- if (commandNumber >= ENET_PROTOCOL_COMMAND_COUNT)
- break;
-
- commandSize = commandSizes [commandNumber];
- if (commandSize == 0 || currentData + commandSize > & host -> receivedData [host -> receivedDataLength])
- break;
-
- currentData += commandSize;
-
- if (peer == NULL && commandNumber != ENET_PROTOCOL_COMMAND_CONNECT)
- break;
-
- command -> header.reliableSequenceNumber = ENET_NET_TO_HOST_16 (command -> header.reliableSequenceNumber);
-
- switch (command -> header.command & ENET_PROTOCOL_COMMAND_MASK)
- {
- case ENET_PROTOCOL_COMMAND_ACKNOWLEDGE:
- if (enet_protocol_handle_acknowledge (host, event, peer, command))
- goto commandError;
- break;
-
- case ENET_PROTOCOL_COMMAND_CONNECT:
- peer = enet_protocol_handle_connect (host, header, command);
- if (peer == NULL)
- goto commandError;
- break;
-
- case ENET_PROTOCOL_COMMAND_VERIFY_CONNECT:
- if (enet_protocol_handle_verify_connect (host, event, peer, command))
- goto commandError;
- break;
-
- case ENET_PROTOCOL_COMMAND_DISCONNECT:
- if (enet_protocol_handle_disconnect (host, peer, command))
- goto commandError;
- break;
-
- case ENET_PROTOCOL_COMMAND_PING:
- if (enet_protocol_handle_ping (host, peer, command))
- goto commandError;
- break;
-
- case ENET_PROTOCOL_COMMAND_SEND_RELIABLE:
- if (enet_protocol_handle_send_reliable (host, peer, command, & currentData))
- goto commandError;
- break;
-
- case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE:
- if (enet_protocol_handle_send_unreliable (host, peer, command, & currentData))
- goto commandError;
- break;
-
- case ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED:
- if (enet_protocol_handle_send_unsequenced (host, peer, command, & currentData))
- goto commandError;
- break;
-
- case ENET_PROTOCOL_COMMAND_SEND_FRAGMENT:
- if (enet_protocol_handle_send_fragment (host, peer, command, & currentData))
- goto commandError;
- break;
-
- case ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT:
- if (enet_protocol_handle_bandwidth_limit (host, peer, command))
- goto commandError;
- break;
-
- case ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE:
- if (enet_protocol_handle_throttle_configure (host, peer, command))
- goto commandError;
- break;
-
- default:
- goto commandError;
- }
-
- if (peer != NULL &&
- (command -> header.command & ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE) != 0)
- {
- enet_uint16 sentTime;
-
- if (! (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME))
- break;
-
- sentTime = ENET_NET_TO_HOST_16 (header -> sentTime);
-
- switch (peer -> state)
- {
- case ENET_PEER_STATE_DISCONNECTING:
- case ENET_PEER_STATE_ACKNOWLEDGING_CONNECT:
- break;
-
- case ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT:
- if ((command -> header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
- enet_peer_queue_acknowledgement (peer, command, sentTime);
- break;
-
- default:
- enet_peer_queue_acknowledgement (peer, command, sentTime);
- break;
- }
- }
- }
-
- commandError:
- if (event != NULL && event -> type != ENET_EVENT_TYPE_NONE)
- return 1;
-
- return 0;
- }
-
- static int
- enet_protocol_receive_incoming_commands (ENetHost * host, ENetEvent * event)
- {
- for (;;)
- {
- int receivedLength;
- ENetBuffer buffer;
-
- buffer.data = host -> receivedData;
- buffer.dataLength = sizeof (host -> receivedData);
-
- receivedLength = enet_socket_receive (host -> socket,
- & host -> receivedAddress,
- & buffer,
- 1);
-
- if (receivedLength < 0)
- return -1;
-
- if (receivedLength == 0)
- return 0;
-
- host -> receivedDataLength = receivedLength;
-
- switch (enet_protocol_handle_incoming_commands (host, event))
- {
- case 1:
- return 1;
-
- case -1:
- return -1;
-
- default:
- break;
- }
- }
-
- return -1;
- }
-
- static void
- enet_protocol_send_acknowledgements (ENetHost * host, ENetPeer * peer)
- {
- ENetProtocol * command = & host -> commands [host -> commandCount];
- ENetBuffer * buffer = & host -> buffers [host -> bufferCount];
- ENetAcknowledgement * acknowledgement;
- ENetListIterator currentAcknowledgement;
-
- currentAcknowledgement = enet_list_begin (& peer -> acknowledgements);
-
- while (currentAcknowledgement != enet_list_end (& peer -> acknowledgements))
- {
- if (command >= & host -> commands [sizeof (host -> commands) / sizeof (ENetProtocol)] ||
- buffer >= & host -> buffers [sizeof (host -> buffers) / sizeof (ENetBuffer)] ||
- peer -> mtu - host -> packetSize < sizeof (ENetProtocolAcknowledge))
- {
- host -> continueSending = 1;
-
- break;
- }
-
- acknowledgement = (ENetAcknowledgement *) currentAcknowledgement;
-
- currentAcknowledgement = enet_list_next (currentAcknowledgement);
-
- buffer -> data = command;
- buffer -> dataLength = sizeof (ENetProtocolAcknowledge);
-
- host -> packetSize += buffer -> dataLength;
-
- command -> header.command = ENET_PROTOCOL_COMMAND_ACKNOWLEDGE;
- command -> header.channelID = acknowledgement -> command.header.channelID;
- command -> acknowledge.receivedReliableSequenceNumber = ENET_HOST_TO_NET_16 (acknowledgement -> command.header.reliableSequenceNumber);
- command -> acknowledge.receivedSentTime = ENET_HOST_TO_NET_16 (acknowledgement -> sentTime);
-
- if ((acknowledgement -> command.header.command & ENET_PROTOCOL_COMMAND_MASK) == ENET_PROTOCOL_COMMAND_DISCONNECT)
- peer -> state = ENET_PEER_STATE_ZOMBIE;
-
- enet_list_remove (& acknowledgement -> acknowledgementList);
- enet_free (acknowledgement);
-
- ++ command;
- ++ buffer;
- }
-
- host -> commandCount = command - host -> commands;
- host -> bufferCount = buffer - host -> buffers;
- }
-
- static void
- enet_protocol_send_unreliable_outgoing_commands (ENetHost * host, ENetPeer * peer)
- {
- ENetProtocol * command = & host -> commands [host -> commandCount];
- ENetBuffer * buffer = & host -> buffers [host -> bufferCount];
- ENetOutgoingCommand * outgoingCommand;
- ENetListIterator currentCommand;
-
- currentCommand = enet_list_begin (& peer -> outgoingUnreliableCommands);
-
- while (currentCommand != enet_list_end (& peer -> outgoingUnreliableCommands))
- {
- size_t commandSize;
-
- outgoingCommand = (ENetOutgoingCommand *) currentCommand;
- commandSize = commandSizes [outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_MASK];
-
- if (command >= & host -> commands [sizeof (host -> commands) / sizeof (ENetProtocol)] ||
- buffer + 1 >= & host -> buffers [sizeof (host -> buffers) / sizeof (ENetBuffer)] ||
- peer -> mtu - host -> packetSize < commandSize ||
- (outgoingCommand -> packet != NULL &&
- peer -> mtu - host -> packetSize < commandSize + outgoingCommand -> packet -> dataLength))
- {
- host -> continueSending = 1;
-
- break;
- }
-
- currentCommand = enet_list_next (currentCommand);
-
- if (outgoingCommand -> packet != NULL)
- {
- peer -> packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER;
- peer -> packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE;
-
- if (peer -> packetThrottleCounter > peer -> packetThrottle)
- {
- -- outgoingCommand -> packet -> referenceCount;
-
- if (outgoingCommand -> packet -> referenceCount == 0)
- enet_packet_destroy (outgoingCommand -> packet);
-
- enet_list_remove (& outgoingCommand -> outgoingCommandList);
- enet_free (outgoingCommand);
-
- continue;
- }
- }
-
- buffer -> data = command;
- buffer -> dataLength = commandSize;
-
- host -> packetSize += buffer -> dataLength;
-
- * command = outgoingCommand -> command;
-
- enet_list_remove (& outgoingCommand -> outgoingCommandList);
-
- if (outgoingCommand -> packet != NULL)
- {
- ++ buffer;
-
- buffer -> data = outgoingCommand -> packet -> data;
- buffer -> dataLength = outgoingCommand -> packet -> dataLength;
-
- host -> packetSize += buffer -> dataLength;
-
- enet_list_insert (enet_list_end (& peer -> sentUnreliableCommands), outgoingCommand);
- }
- else
- enet_free (outgoingCommand);
-
- ++ command;
- ++ buffer;
- }
-
- host -> commandCount = command - host -> commands;
- host -> bufferCount = buffer - host -> buffers;
-
- if (peer -> state == ENET_PEER_STATE_DISCONNECT_LATER &&
- enet_list_empty (& peer -> outgoingReliableCommands) &&
- enet_list_empty (& peer -> outgoingUnreliableCommands) &&
- enet_list_empty (& peer -> sentReliableCommands))
- enet_peer_disconnect (peer, peer -> disconnectData);
- }
-
- static int
- enet_protocol_check_timeouts (ENetHost * host, ENetPeer * peer, ENetEvent * event)
- {
- ENetOutgoingCommand * outgoingCommand;
- ENetListIterator currentCommand;
-
- currentCommand = enet_list_begin (& peer -> sentReliableCommands);
-
- while (currentCommand != enet_list_end (& peer -> sentReliableCommands))
- {
- outgoingCommand = (ENetOutgoingCommand *) currentCommand;
-
- currentCommand = enet_list_next (currentCommand);
-
- if (ENET_TIME_DIFFERENCE (timeCurrent, outgoingCommand -> sentTime) < outgoingCommand -> roundTripTimeout)
- continue;
-
- if(peer -> earliestTimeout == 0 ||
- ENET_TIME_LESS(outgoingCommand -> sentTime, peer -> earliestTimeout))
- peer -> earliestTimeout = outgoingCommand -> sentTime;
-
- if (peer -> earliestTimeout != 0 &&
- (ENET_TIME_DIFFERENCE(timeCurrent, peer -> earliestTimeout) >= ENET_PEER_TIMEOUT_MAXIMUM ||
- (outgoingCommand -> roundTripTimeout >= outgoingCommand -> roundTripTimeoutLimit &&
- ENET_TIME_DIFFERENCE(timeCurrent, peer -> earliestTimeout) >= ENET_PEER_TIMEOUT_MINIMUM)))
- {
- enet_protocol_notify_disconnect (host, peer, event);
-
- return 1;
- }
-
- if (outgoingCommand -> packet != NULL)
- peer -> reliableDataInTransit -= outgoingCommand -> fragmentLength;
-
- ++ peer -> packetsLost;
-
- outgoingCommand -> roundTripTimeout *= 2;
-
- enet_list_insert (enet_list_begin (& peer -> outgoingReliableCommands),
- enet_list_remove (& outgoingCommand -> outgoingCommandList));
-
- if (currentCommand == enet_list_begin (& peer -> sentReliableCommands) &&
- ! enet_list_empty (& peer -> sentReliableCommands))
- {
- outgoingCommand = (ENetOutgoingCommand *) currentCommand;
-
- peer -> nextTimeout = outgoingCommand -> sentTime + outgoingCommand -> roundTripTimeout;
- }
- }
-
- return 0;
- }
-
- static void
- enet_protocol_send_reliable_outgoing_commands (ENetHost * host, ENetPeer * peer)
- {
- ENetProtocol * command = & host -> commands [host -> commandCount];
- ENetBuffer * buffer = & host -> buffers [host -> bufferCount];
- ENetOutgoingCommand * outgoingCommand;
- ENetListIterator currentCommand;
-
- currentCommand = enet_list_begin (& peer -> outgoingReliableCommands);
-
- while (currentCommand != enet_list_end (& peer -> outgoingReliableCommands))
- {
- size_t commandSize;
-
- outgoingCommand = (ENetOutgoingCommand *) currentCommand;
- commandSize = commandSizes [outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_MASK];
-
- if (command >= & host -> commands [sizeof (host -> commands) / sizeof (ENetProtocol)] ||
- buffer + 1 >= & host -> buffers [sizeof (host -> buffers) / sizeof (ENetBuffer)] ||
- peer -> mtu - host -> packetSize < commandSize)
- {
- host -> continueSending = 1;
-
- break;
- }
-
- currentCommand = enet_list_next (currentCommand);
-
- if (outgoingCommand -> packet != NULL)
- {
- if (peer -> reliableDataInTransit + outgoingCommand -> fragmentLength > peer -> windowSize)
- break;
-
- if ((enet_uint16) (peer -> mtu - host -> packetSize) < (enet_uint16) (commandSize + outgoingCommand -> fragmentLength))
- {
- host -> continueSending = 1;
-
- break;
- }
- }
-
- if (outgoingCommand -> roundTripTimeout == 0)
- {
- outgoingCommand -> roundTripTimeout = peer -> roundTripTime + 4 * peer -> roundTripTimeVariance;
- outgoingCommand -> roundTripTimeoutLimit = ENET_PEER_TIMEOUT_LIMIT * outgoingCommand -> roundTripTimeout;
- }
-
- if (enet_list_empty (& peer -> sentReliableCommands))
- peer -> nextTimeout = timeCurrent + outgoingCommand -> roundTripTimeout;
-
- enet_list_insert (enet_list_end (& peer -> sentReliableCommands),
- enet_list_remove (& outgoingCommand -> outgoingCommandList));
-
- outgoingCommand -> sentTime = timeCurrent;
-
- buffer -> data = command;
- buffer -> dataLength = commandSize;
-
- host -> packetSize += buffer -> dataLength;
- host -> headerFlags |= ENET_PROTOCOL_HEADER_FLAG_SENT_TIME;
-
- * command = outgoingCommand -> command;
-
- if (outgoingCommand -> packet != NULL)
- {
- ++ buffer;
-
- buffer -> data = outgoingCommand -> packet -> data + outgoingCommand -> fragmentOffset;
- buffer -> dataLength = outgoingCommand -> fragmentLength;
-
- host -> packetSize += outgoingCommand -> fragmentLength;
-
- peer -> reliableDataInTransit += outgoingCommand -> fragmentLength;
- }
-
- ++ peer -> packetsSent;
-
- ++ command;
- ++ buffer;
- }
-
- host -> commandCount = command - host -> commands;
- host -> bufferCount = buffer - host -> buffers;
- }
-
- static int
- enet_protocol_send_outgoing_commands (ENetHost * host, ENetEvent * event, int checkForTimeouts)
- {
- ENetProtocolHeader header;
- ENetPeer * currentPeer;
- int sentLength;
-
- host -> continueSending = 1;
-
- while (host -> continueSending)
- for (host -> continueSending = 0,
- currentPeer = host -> peers;
- currentPeer < & host -> peers [host -> peerCount];
- ++ currentPeer)
- {
- if (currentPeer -> state == ENET_PEER_STATE_DISCONNECTED ||
- currentPeer -> state == ENET_PEER_STATE_ZOMBIE)
- continue;
-
- host -> headerFlags = 0;
- host -> commandCount = 0;
- host -> bufferCount = 1;
- host -> packetSize = sizeof (ENetProtocolHeader);
-
- if (! enet_list_empty (& currentPeer -> acknowledgements))
- enet_protocol_send_acknowledgements (host, currentPeer);
-
- if (checkForTimeouts != 0 &&
- ! enet_list_empty (& currentPeer -> sentReliableCommands) &&
- ENET_TIME_GREATER_EQUAL (timeCurrent, currentPeer -> nextTimeout) &&
- enet_protocol_check_timeouts (host, currentPeer, event) == 1)
- return 1;
-
- if (! enet_list_empty (& currentPeer -> outgoingReliableCommands))
- enet_protocol_send_reliable_outgoing_commands (host, currentPeer);
- else
- if (enet_list_empty (& currentPeer -> sentReliableCommands) &&
- ENET_TIME_DIFFERENCE (timeCurrent, currentPeer -> lastReceiveTime) >= ENET_PEER_PING_INTERVAL &&
- currentPeer -> mtu - host -> packetSize >= sizeof (ENetProtocolPing))
- {
- enet_peer_ping (currentPeer);
- enet_protocol_send_reliable_outgoing_commands (host, currentPeer);
- }
-
- if (! enet_list_empty (& currentPeer -> outgoingUnreliableCommands))
- enet_protocol_send_unreliable_outgoing_commands (host, currentPeer);
-
- if (host -> commandCount == 0)
- continue;
-
- if (currentPeer -> packetLossEpoch == 0)
- currentPeer -> packetLossEpoch = timeCurrent;
- else
- if (ENET_TIME_DIFFERENCE (timeCurrent, currentPeer -> packetLossEpoch) >= ENET_PEER_PACKET_LOSS_INTERVAL &&
- currentPeer -> packetsSent > 0)
- {
- enet_uint32 packetLoss = currentPeer -> packetsLost * ENET_PEER_PACKET_LOSS_SCALE / currentPeer -> packetsSent;
-
- #ifdef ENET_DEBUG
- #ifdef WIN32
- printf (
- #else
- fprintf (stderr,
- #endif
- "peer %u: %f%%+-%f%% packet loss, %u+-%u ms round trip time, %f%% throttle, %u/%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 -> outgoingReliableCommands), enet_list_size (& currentPeer -> outgoingUnreliableCommands), 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 / 4;
-
- if (packetLoss >= currentPeer -> packetLoss)
- {
- currentPeer -> packetLoss += (packetLoss - currentPeer -> packetLoss) / 8;
- currentPeer -> packetLossVariance += (packetLoss - currentPeer -> packetLoss) / 4;
- }
- else
- {
- currentPeer -> packetLoss -= (currentPeer -> packetLoss - packetLoss) / 8;
- currentPeer -> packetLossVariance += (currentPeer -> packetLoss - packetLoss) / 4;
- }
-
- currentPeer -> packetLossEpoch = timeCurrent;
- currentPeer -> packetsSent = 0;
- currentPeer -> packetsLost = 0;
- }
-
- header.checksum = currentPeer -> sessionID;
- header.peerID = ENET_HOST_TO_NET_16 (currentPeer -> outgoingPeerID | host -> headerFlags);
-
- host -> buffers -> data = & header;
- if (host -> headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME)
- {
- header.sentTime = ENET_HOST_TO_NET_16 (timeCurrent & 0xFFFF);
-
- host -> buffers -> dataLength = sizeof (ENetProtocolHeader);
- }
- else
- host -> buffers -> dataLength = (size_t) & ((ENetProtocolHeader *) 0) -> sentTime;
-
- #ifdef USE_CRC32
- header.checksum = enet_crc32 (host -> buffers, host -> bufferCount);
- #endif
-
- currentPeer -> lastSendTime = timeCurrent;
-
- sentLength = enet_socket_send (host -> socket, & currentPeer -> address, host -> buffers, host -> bufferCount);
-
- enet_protocol_remove_sent_unreliable_commands (currentPeer);
-
- if (sentLength < 0)
- return -1;
- }
-
- return 0;
- }
-
- /** Sends any queued packets on the host specified to its designated peers.
-
- @param host host to flush
- @remarks this function need only be used in circumstances where one wishes to send queued packets earlier than in a call to enet_host_service().
- @ingroup host
- */
- void
- enet_host_flush (ENetHost * host)
- {
- timeCurrent = enet_time_get ();
-
- enet_protocol_send_outgoing_commands (host, NULL, 0);
- }
-
- /** Waits for events on the host specified and shuttles packets between
- the host and its peers.
-
- @param host host to service
- @param event an event structure where event details will be placed if one occurs
- if event == NULL then no events will be delivered
- @param timeout number of milliseconds that ENet should wait for events
- @retval > 0 if an event occurred within the specified time limit
- @retval 0 if no event occurred
- @retval < 0 on failure
- @remarks enet_host_service should be called fairly regularly for adequate performance
- @ingroup host
- */
- int
- enet_host_service (ENetHost * host, ENetEvent * event, enet_uint32 timeout)
- {
- enet_uint32 waitCondition;
-
- if (event != NULL)
- {
- event -> type = ENET_EVENT_TYPE_NONE;
- event -> peer = NULL;
- event -> packet = NULL;
-
- switch (enet_protocol_dispatch_incoming_commands (host, event))
- {
- case 1:
- return 1;
-
- case -1:
- perror ("Error dispatching incoming packets");
-
- return -1;
-
- default:
- break;
- }
- }
-
- timeCurrent = enet_time_get ();
-
- timeout += timeCurrent;
-
- do
- {
- if (ENET_TIME_DIFFERENCE (timeCurrent, host -> bandwidthThrottleEpoch) >= ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL)
- enet_host_bandwidth_throttle (host);
-
- switch (enet_protocol_send_outgoing_commands (host, event, 1))
- {
- case 1:
- return 1;
-
- case -1:
- perror ("Error sending outgoing packets");
-
- return -1;
-
- default:
- break;
- }
-
- switch (enet_protocol_receive_incoming_commands (host, event))
- {
- case 1:
- return 1;
-
- case -1:
- perror ("Error receiving incoming packets");
-
- return -1;
-
- default:
- break;
- }
-
- switch (enet_protocol_send_outgoing_commands (host, event, 1))
- {
- case 1:
- return 1;
-
- case -1:
- perror ("Error sending outgoing packets");
-
- return -1;
-
- default:
- break;
- }
-
- if (event != NULL)
- {
- switch (enet_protocol_dispatch_incoming_commands (host, event))
- {
- case 1:
- return 1;
-
- case -1:
- perror ("Error dispatching incoming packets");
-
- return -1;
-
- default:
- break;
- }
- }
-
- timeCurrent = enet_time_get ();
-
- if (ENET_TIME_GREATER_EQUAL (timeCurrent, timeout))
- return 0;
-
- waitCondition = ENET_SOCKET_WAIT_RECEIVE;
-
- if (enet_socket_wait (host -> socket, & waitCondition, ENET_TIME_DIFFERENCE (timeout, timeCurrent)) != 0)
- return -1;
-
- timeCurrent = enet_time_get ();
- } while (waitCondition == ENET_SOCKET_WAIT_RECEIVE);
-
- return 0;
- }
-
-