diff options
Diffstat (limited to 'libs/enet/protocol.c')
| -rw-r--r-- | libs/enet/protocol.c | 1829 |
1 files changed, 0 insertions, 1829 deletions
diff --git a/libs/enet/protocol.c b/libs/enet/protocol.c deleted file mode 100644 index b51ab469..00000000 --- a/libs/enet/protocol.c +++ /dev/null @@ -1,1829 +0,0 @@ -/** - @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 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), - sizeof (ENetProtocolSendFragment) -}; - -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) -{ - while (! enet_list_empty (& host -> dispatchQueue)) - { - ENetPeer * peer = (ENetPeer *) enet_list_remove (enet_list_begin (& host -> dispatchQueue)); - - peer -> needsDispatch = 0; - - switch (peer -> state) - { - case ENET_PEER_STATE_CONNECTION_PENDING: - case ENET_PEER_STATE_CONNECTION_SUCCEEDED: - peer -> state = ENET_PEER_STATE_CONNECTED; - - event -> type = ENET_EVENT_TYPE_CONNECT; - event -> peer = peer; - event -> data = peer -> eventData; - - return 1; - - case ENET_PEER_STATE_ZOMBIE: - host -> recalculateBandwidthLimits = 1; - - event -> type = ENET_EVENT_TYPE_DISCONNECT; - event -> peer = peer; - event -> data = peer -> eventData; - - enet_peer_reset (peer); - - return 1; - - case ENET_PEER_STATE_CONNECTED: - if (enet_list_empty (& peer -> dispatchedCommands)) - continue; - - event -> packet = enet_peer_receive (peer, & event -> channelID); - if (event -> packet == NULL) - continue; - - event -> type = ENET_EVENT_TYPE_RECEIVE; - event -> peer = peer; - - if (! enet_list_empty (& peer -> dispatchedCommands)) - { - peer -> needsDispatch = 1; - - enet_list_insert (enet_list_end (& host -> dispatchQueue), & peer -> dispatchList); - } - - return 1; - } - } - - return 0; -} - -static void -enet_protocol_dispatch_state (ENetHost * host, ENetPeer * peer, ENetPeerState state) -{ - peer -> state = state; - - if (! peer -> needsDispatch) - { - enet_list_insert (enet_list_end (& host -> dispatchQueue), & peer -> dispatchList); - - peer -> needsDispatch = 1; - } -} - -static void -enet_protocol_notify_connect (ENetHost * host, ENetPeer * peer, ENetEvent * event) -{ - host -> recalculateBandwidthLimits = 1; - - if (event != NULL) - { - peer -> state = ENET_PEER_STATE_CONNECTED; - - event -> type = ENET_EVENT_TYPE_CONNECT; - event -> peer = peer; - event -> data = peer -> eventData; - } - else - enet_protocol_dispatch_state (host, peer, peer -> state == ENET_PEER_STATE_CONNECTING ? ENET_PEER_STATE_CONNECTION_SUCCEEDED : ENET_PEER_STATE_CONNECTION_PENDING); -} - -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) - { - event -> type = ENET_EVENT_TYPE_DISCONNECT; - event -> peer = peer; - event -> data = 0; - - enet_peer_reset (peer); - } - else - { - peer -> eventData = 0; - - enet_protocol_dispatch_state (host, peer, ENET_PEER_STATE_ZOMBIE); - } -} - -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; - int wasSent = 1; - - 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)) - { - for (currentCommand = enet_list_begin (& peer -> outgoingReliableCommands); - currentCommand != enet_list_end (& peer -> outgoingReliableCommands); - currentCommand = enet_list_next (currentCommand)) - { - outgoingCommand = (ENetOutgoingCommand *) currentCommand; - - 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 -> outgoingReliableCommands)) - return ENET_PROTOCOL_COMMAND_NONE; - - wasSent = 0; - } - - if (channelID < peer -> channelCount) - { - ENetChannel * channel = & peer -> channels [channelID]; - enet_uint16 reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; - if (channel -> reliableWindows [reliableWindow] > 0) - { - -- channel -> reliableWindows [reliableWindow]; - if (! channel -> reliableWindows [reliableWindow]) - channel -> usedReliableWindows &= ~ (1 << reliableWindow); - } - } - - commandNumber = (ENetProtocolCommand) (outgoingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_MASK); - - enet_list_remove (& outgoingCommand -> outgoingCommandList); - - if (outgoingCommand -> packet != NULL) - { - if (wasSent) - 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_uint8 incomingSessionID, outgoingSessionID; - enet_uint32 mtu, windowSize; - ENetChannel * channel; - size_t channelCount; - ENetPeer * currentPeer; - ENetProtocol verifyCommand; - - 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 -> connectID == command -> connect.connectID) - 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; - - if (channelCount > host -> channelLimit) - channelCount = host -> channelLimit; - currentPeer -> channels = (ENetChannel *) enet_malloc (channelCount * sizeof (ENetChannel)); - if (currentPeer -> channels == NULL) - return NULL; - currentPeer -> channelCount = channelCount; - currentPeer -> state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT; - currentPeer -> connectID = command -> connect.connectID; - 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 -> eventData = ENET_NET_TO_HOST_32 (command -> connect.data); - - incomingSessionID = command -> connect.incomingSessionID == 0xFF ? currentPeer -> outgoingSessionID : command -> connect.incomingSessionID; - incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT); - if (incomingSessionID == currentPeer -> outgoingSessionID) - incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT); - currentPeer -> outgoingSessionID = incomingSessionID; - - outgoingSessionID = command -> connect.outgoingSessionID == 0xFF ? currentPeer -> incomingSessionID : command -> connect.outgoingSessionID; - outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT); - if (outgoingSessionID == currentPeer -> incomingSessionID) - outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT); - currentPeer -> incomingSessionID = outgoingSessionID; - - 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); - - channel -> usedReliableWindows = 0; - memset (channel -> reliableWindows, 0, sizeof (channel -> reliableWindows)); - } - - mtu = ENET_NET_TO_HOST_32 (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 - if (host -> outgoingBandwidth == 0 || - currentPeer -> incomingBandwidth == 0) - currentPeer -> windowSize = (ENET_MAX (host -> outgoingBandwidth, currentPeer -> incomingBandwidth) / - ENET_PEER_WINDOW_SIZE_SCALE) * - ENET_PROTOCOL_MINIMUM_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.incomingSessionID = incomingSessionID; - verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID; - 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); - verifyCommand.verifyConnect.connectID = currentPeer -> connectID; - - 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 || - enet_peer_queue_incoming_command (peer, command, packet, 0) == NULL) - return -1; - - 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) - unsequencedGroup += 0x10000; - - if (unsequencedGroup >= (enet_uint32) peer -> incomingUnsequencedGroup + ENET_PEER_FREE_UNSEQUENCED_WINDOWS * ENET_PEER_UNSEQUENCED_WINDOW_SIZE) - return 0; - - unsequencedGroup &= 0xFFFF; - - if (unsequencedGroup - index != peer -> incomingUnsequencedGroup) - { - peer -> incomingUnsequencedGroup = unsequencedGroup - index; - - memset (peer -> unsequencedWindow, 0, sizeof (peer -> unsequencedWindow)); - } - else - if (peer -> unsequencedWindow [index / 32] & (1 << (index % 32))) - return 0; - - packet = enet_packet_create ((const enet_uint8 *) command + sizeof (ENetProtocolSendUnsequenced), - dataLength, - ENET_PACKET_FLAG_UNSEQUENCED); - if (packet == NULL || - enet_peer_queue_incoming_command (peer, command, packet, 0) == NULL) - return -1; - - peer -> unsequencedWindow [index / 32] |= 1 << (index % 32); - - 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 || - enet_peer_queue_incoming_command (peer, command, packet, 0) == NULL) - return -1; - - 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; - enet_uint16 startWindow, currentWindow; - ENetListIterator currentCommand; - ENetIncomingCommand * startCommand = NULL; - - 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); - startWindow = startSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; - currentWindow = channel -> incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; - - if (startSequenceNumber < channel -> incomingReliableSequenceNumber) - startWindow += ENET_PEER_RELIABLE_WINDOWS; - - if (startWindow < currentWindow || startWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1) - 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)) - { - ENetIncomingCommand * incomingCommand = (ENetIncomingCommand *) currentCommand; - - if (startSequenceNumber >= channel -> incomingReliableSequenceNumber) - { - if (incomingCommand -> reliableSequenceNumber < channel -> incomingReliableSequenceNumber) - continue; - } - else - if (incomingCommand -> reliableSequenceNumber >= channel -> incomingReliableSequenceNumber) - break; - - if (incomingCommand -> reliableSequenceNumber <= startSequenceNumber) - { - if (incomingCommand -> reliableSequenceNumber < startSequenceNumber) - break; - - if ((incomingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_FRAGMENT || - totalLength != incomingCommand -> packet -> dataLength || - fragmentCount != incomingCommand -> fragmentCount) - return -1; - - startCommand = incomingCommand; - break; - } - } - - if (startCommand == NULL) - { - ENetProtocol hostCommand = * command; - ENetPacket * packet = enet_packet_create (NULL, totalLength, ENET_PACKET_FLAG_RELIABLE); - if (packet == NULL) - return -1; - - hostCommand.header.reliableSequenceNumber = startSequenceNumber; - - startCommand = enet_peer_queue_incoming_command (peer, & hostCommand, packet, fragmentCount); - if (startCommand == NULL) - 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); - - if (startCommand -> fragmentsRemaining <= 0) - enet_peer_dispatch_incoming_reliable_commands (peer, channel); - } - - return 0; -} - -static int -enet_protocol_handle_send_unreliable_fragment (ENetHost * host, ENetPeer * peer, const ENetProtocol * command, enet_uint8 ** currentData) -{ - enet_uint32 fragmentNumber, - fragmentCount, - fragmentOffset, - fragmentLength, - reliableSequenceNumber, - startSequenceNumber, - totalLength; - enet_uint16 reliableWindow, currentWindow; - ENetChannel * channel; - ENetListIterator currentCommand; - ENetIncomingCommand * startCommand = NULL; - - 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]; - reliableSequenceNumber = command -> header.reliableSequenceNumber; - startSequenceNumber = ENET_NET_TO_HOST_16 (command -> sendFragment.startSequenceNumber); - - reliableWindow = reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; - currentWindow = channel -> incomingReliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; - - if (reliableSequenceNumber < channel -> incomingReliableSequenceNumber) - reliableWindow += ENET_PEER_RELIABLE_WINDOWS; - - if (reliableWindow < currentWindow || reliableWindow >= currentWindow + ENET_PEER_FREE_RELIABLE_WINDOWS - 1) - return 0; - - if (reliableSequenceNumber == channel -> incomingReliableSequenceNumber && - startSequenceNumber <= channel -> incomingUnreliableSequenceNumber) - 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 -> incomingUnreliableCommands)); - currentCommand != enet_list_end (& channel -> incomingUnreliableCommands); - currentCommand = enet_list_previous (currentCommand)) - { - ENetIncomingCommand * incomingCommand = (ENetIncomingCommand *) currentCommand; - - if (reliableSequenceNumber >= channel -> incomingReliableSequenceNumber) - { - if (incomingCommand -> reliableSequenceNumber < channel -> incomingReliableSequenceNumber) - continue; - } - else - if (incomingCommand -> reliableSequenceNumber >= channel -> incomingReliableSequenceNumber) - break; - - if (incomingCommand -> reliableSequenceNumber < reliableSequenceNumber) - break; - - if (incomingCommand -> reliableSequenceNumber > reliableSequenceNumber) - continue; - - if (incomingCommand -> unreliableSequenceNumber <= startSequenceNumber) - { - if (incomingCommand -> unreliableSequenceNumber < startSequenceNumber) - break; - - if ((incomingCommand -> command.header.command & ENET_PROTOCOL_COMMAND_MASK) != ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT || - totalLength != incomingCommand -> packet -> dataLength || - fragmentCount != incomingCommand -> fragmentCount) - return -1; - - startCommand = incomingCommand; - break; - } - } - - if (startCommand == NULL) - { - ENetPacket * packet = enet_packet_create (NULL, totalLength, ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT); - if (packet == NULL) - return -1; - - startCommand = enet_peer_queue_incoming_command (peer, command, packet, fragmentCount); - if (startCommand == NULL) - 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); - - if (startCommand -> fragmentsRemaining <= 0) - enet_peer_dispatch_incoming_unreliable_commands (peer, channel); - } - - 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) -{ - if (peer -> state == ENET_PEER_STATE_ZOMBIE || peer -> state == ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT) - return 0; - - enet_peer_reset_queues (peer); - - if (peer -> state == ENET_PEER_STATE_CONNECTION_SUCCEEDED) - enet_protocol_dispatch_state (host, peer, 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 - enet_protocol_dispatch_state (host, peer, ENET_PEER_STATE_ZOMBIE); - - if (peer -> state != ENET_PEER_STATE_DISCONNECTED) - peer -> eventData = 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 |= host -> serviceTime & 0xFFFF0000; - if ((receivedSentTime & 0x8000) > (host -> serviceTime & 0x8000)) - receivedSentTime -= 0x10000; - - if (ENET_TIME_LESS (host -> serviceTime, receivedSentTime)) - return 0; - - peer -> lastReceiveTime = host -> serviceTime; - peer -> earliestTimeout = 0; - - roundTripTime = ENET_TIME_DIFFERENCE (host -> serviceTime, 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 (host -> serviceTime, peer -> packetThrottleEpoch) >= peer -> packetThrottleInterval) - { - peer -> lastRoundTripTime = peer -> lowestRoundTripTime; - peer -> lastRoundTripTimeVariance = peer -> highestRoundTripTimeVariance; - peer -> lowestRoundTripTime = peer -> roundTripTime; - peer -> highestRoundTripTimeVariance = peer -> roundTripTimeVariance; - peer -> packetThrottleEpoch = host -> serviceTime; - } - - 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 -> eventData); - break; - } - - return 0; -} - -static int -enet_protocol_handle_verify_connect (ENetHost * host, ENetEvent * event, ENetPeer * peer, const ENetProtocol * command) -{ - enet_uint32 mtu, windowSize; - size_t channelCount; - - if (peer -> state != ENET_PEER_STATE_CONNECTING) - return 0; - - channelCount = ENET_NET_TO_HOST_32 (command -> verifyConnect.channelCount); - - if (channelCount < ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT || channelCount > ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT || - 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 || - command -> verifyConnect.connectID != peer -> connectID) - { - peer -> eventData = 0; - - enet_protocol_dispatch_state (host, peer, ENET_PEER_STATE_ZOMBIE); - - return -1; - } - - enet_protocol_remove_sent_reliable_command (peer, 1, 0xFF); - - if (channelCount < peer -> channelCount) - peer -> channelCount = channelCount; - - peer -> outgoingPeerID = ENET_NET_TO_HOST_16 (command -> verifyConnect.outgoingPeerID); - peer -> incomingSessionID = command -> verifyConnect.incomingSessionID; - peer -> outgoingSessionID = command -> verifyConnect.outgoingSessionID; - - mtu = ENET_NET_TO_HOST_32 (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; - enet_uint8 sessionID; - - if (host -> receivedDataLength < (size_t) & ((ENetProtocolHeader *) 0) -> sentTime) - return 0; - - header = (ENetProtocolHeader *) host -> receivedData; - - peerID = ENET_NET_TO_HOST_16 (header -> peerID); - sessionID = (peerID & ENET_PROTOCOL_HEADER_SESSION_MASK) >> ENET_PROTOCOL_HEADER_SESSION_SHIFT; - flags = peerID & ENET_PROTOCOL_HEADER_FLAG_MASK; - peerID &= ~ (ENET_PROTOCOL_HEADER_FLAG_MASK | ENET_PROTOCOL_HEADER_SESSION_MASK); - - headerSize = (flags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME ? sizeof (ENetProtocolHeader) : (size_t) & ((ENetProtocolHeader *) 0) -> sentTime); - if (host -> checksum != NULL) - headerSize += sizeof (enet_uint32); - - 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 || - host -> receivedAddress.port != peer -> address.port) && - peer -> address.host != ENET_HOST_BROADCAST) || - (peer -> outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID && - sessionID != peer -> incomingSessionID)) - return 0; - } - - if (flags & ENET_PROTOCOL_HEADER_FLAG_COMPRESSED) - { - size_t originalSize; - if (host -> compressor.context == NULL || host -> compressor.decompress == NULL) - return 0; - - originalSize = host -> compressor.decompress (host -> compressor.context, - host -> receivedData + headerSize, - host -> receivedDataLength - headerSize, - host -> packetData [1] + headerSize, - sizeof (host -> packetData [1]) - headerSize); - if (originalSize <= 0 || originalSize > sizeof (host -> packetData [1]) - headerSize) - return 0; - - memcpy (host -> packetData [1], header, headerSize); - host -> receivedData = host -> packetData [1]; - host -> receivedDataLength = headerSize + originalSize; - } - - if (host -> checksum != NULL) - { - enet_uint32 * checksum = (enet_uint32 *) & host -> receivedData [headerSize - sizeof (enet_uint32)], - desiredChecksum = * checksum; - ENetBuffer buffer; - - * checksum = peer != NULL ? peer -> connectID : 0; - - buffer.data = host -> receivedData; - buffer.dataLength = host -> receivedDataLength; - - if (host -> checksum (& buffer, 1) != desiredChecksum) - return 0; - } - - if (peer != NULL) - { - peer -> address.host = host -> receivedAddress.host; - peer -> address.port = host -> receivedAddress.port; - peer -> incomingDataTotal += host -> receivedDataLength; - } - - 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; - - case ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT: - if (enet_protocol_handle_send_unreliable_fragment (host, peer, command, & currentData)) - 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 -> packetData [0]; - buffer.dataLength = sizeof (host -> packetData [0]); - - receivedLength = enet_socket_receive (host -> socket, - & host -> receivedAddress, - & buffer, - 1); - - if (receivedLength < 0) - return -1; - - if (receivedLength == 0) - return 0; - - host -> receivedData = host -> packetData [0]; - host -> receivedDataLength = receivedLength; - - host -> totalReceivedData += receivedLength; - host -> totalReceivedPackets ++; - - 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) - enet_protocol_dispatch_state (host, peer, 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 -> fragmentLength)) - { - host -> continueSending = 1; - - break; - } - - currentCommand = enet_list_next (currentCommand); - - if (outgoingCommand -> packet != NULL && outgoingCommand -> fragmentOffset == 0) - { - peer -> packetThrottleCounter += ENET_PEER_PACKET_THROTTLE_COUNTER; - peer -> packetThrottleCounter %= ENET_PEER_PACKET_THROTTLE_SCALE; - - if (peer -> packetThrottleCounter > peer -> packetThrottle) - { - enet_uint16 reliableSequenceNumber = outgoingCommand -> reliableSequenceNumber, - unreliableSequenceNumber = outgoingCommand -> unreliableSequenceNumber; - for (;;) - { - -- outgoingCommand -> packet -> referenceCount; - - if (outgoingCommand -> packet -> referenceCount == 0) - enet_packet_destroy (outgoingCommand -> packet); - - enet_list_remove (& outgoingCommand -> outgoingCommandList); - enet_free (outgoingCommand); - - if (currentCommand == enet_list_end (& peer -> outgoingUnreliableCommands)) - break; - - outgoingCommand = (ENetOutgoingCommand *) currentCommand; - if (outgoingCommand -> reliableSequenceNumber != reliableSequenceNumber || - outgoingCommand -> unreliableSequenceNumber != unreliableSequenceNumber) - break; - - currentCommand = enet_list_next (currentCommand); - } - - 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 + outgoingCommand -> fragmentOffset; - buffer -> dataLength = outgoingCommand -> fragmentLength; - - 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 -> eventData); -} - -static int -enet_protocol_check_timeouts (ENetHost * host, ENetPeer * peer, ENetEvent * event) -{ - ENetOutgoingCommand * outgoingCommand; - ENetListIterator currentCommand, insertPosition; - - currentCommand = enet_list_begin (& peer -> sentReliableCommands); - insertPosition = enet_list_begin (& peer -> outgoingReliableCommands); - - while (currentCommand != enet_list_end (& peer -> sentReliableCommands)) - { - outgoingCommand = (ENetOutgoingCommand *) currentCommand; - - currentCommand = enet_list_next (currentCommand); - - if (ENET_TIME_DIFFERENCE (host -> serviceTime, 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 (host -> serviceTime, peer -> earliestTimeout) >= ENET_PEER_TIMEOUT_MAXIMUM || - (outgoingCommand -> roundTripTimeout >= outgoingCommand -> roundTripTimeoutLimit && - ENET_TIME_DIFFERENCE (host -> serviceTime, 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 (insertPosition, 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 int -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; - ENetChannel *channel; - enet_uint16 reliableWindow; - size_t commandSize; - int windowExceeded = 0, windowWrap = 0, canPing = 1; - - currentCommand = enet_list_begin (& peer -> outgoingReliableCommands); - - while (currentCommand != enet_list_end (& peer -> outgoingReliableCommands)) - { - outgoingCommand = (ENetOutgoingCommand *) currentCommand; - - channel = outgoingCommand -> command.header.channelID < peer -> channelCount ? & peer -> channels [outgoingCommand -> command.header.channelID] : NULL; - reliableWindow = outgoingCommand -> reliableSequenceNumber / ENET_PEER_RELIABLE_WINDOW_SIZE; - if (channel != NULL) - { - if (! windowWrap && - 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) - 1) << reliableWindow) | - (((1 << ENET_PEER_FREE_RELIABLE_WINDOWS) - 1) >> (ENET_PEER_RELIABLE_WINDOW_SIZE - reliableWindow))))) - windowWrap = 1; - if (windowWrap) - { - currentCommand = enet_list_next (currentCommand); - - 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) - { - currentCommand = enet_list_next (currentCommand); - - continue; - } - } - - canPing = 0; - - 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 && - (enet_uint16) (peer -> mtu - host -> packetSize) < (enet_uint16) (commandSize + outgoingCommand -> fragmentLength))) - { - host -> continueSending = 1; - - break; - } - - currentCommand = enet_list_next (currentCommand); - - if (channel != NULL && outgoingCommand -> sendAttempts < 1) - { - channel -> usedReliableWindows |= 1 << reliableWindow; - ++ channel -> reliableWindows [reliableWindow]; - } - - ++ outgoingCommand -> sendAttempts; - - 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 = host -> serviceTime + outgoingCommand -> roundTripTimeout; - - enet_list_insert (enet_list_end (& peer -> sentReliableCommands), - enet_list_remove (& outgoingCommand -> outgoingCommandList)); - - outgoingCommand -> sentTime = host -> serviceTime; - - 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; - - return canPing; -} - -static int -enet_protocol_send_outgoing_commands (ENetHost * host, ENetEvent * event, int checkForTimeouts) -{ - enet_uint8 headerData [sizeof (ENetProtocolHeader) + sizeof (enet_uint32)]; - ENetProtocolHeader * header = (ENetProtocolHeader *) headerData; - ENetPeer * currentPeer; - int sentLength; - size_t shouldCompress = 0; - - 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 (host -> serviceTime, 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)) && - enet_list_empty (& currentPeer -> sentReliableCommands) && - ENET_TIME_DIFFERENCE (host -> serviceTime, 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 = host -> serviceTime; - else - if (ENET_TIME_DIFFERENCE (host -> serviceTime, 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 = host -> serviceTime; - currentPeer -> packetsSent = 0; - currentPeer -> packetsLost = 0; - } - - host -> buffers -> data = headerData; - if (host -> headerFlags & ENET_PROTOCOL_HEADER_FLAG_SENT_TIME) - { - header -> sentTime = ENET_HOST_TO_NET_16 (host -> serviceTime & 0xFFFF); - - host -> buffers -> dataLength = sizeof (ENetProtocolHeader); - } - else - host -> buffers -> dataLength = (size_t) & ((ENetProtocolHeader *) 0) -> sentTime; - - shouldCompress = 0; - if (host -> compressor.context != NULL && host -> compressor.compress != NULL) - { - size_t originalSize = host -> packetSize - sizeof(ENetProtocolHeader), - compressedSize = host -> compressor.compress (host -> compressor.context, - & host -> buffers [1], host -> bufferCount - 1, - originalSize, - host -> packetData [1], - originalSize); - if (compressedSize > 0 && compressedSize < originalSize) - { - host -> headerFlags |= ENET_PROTOCOL_HEADER_FLAG_COMPRESSED; - shouldCompress = compressedSize; -#ifdef ENET_DEBUG_COMPRESS -#ifdef _WIN32 - printf ( -#else - fprintf (stderr, -#endif - "peer %u: compressed %u -> %u (%u%%)\n", currentPeer -> incomingPeerID, originalSize, compressedSize, (compressedSize * 100) / originalSize); -#endif - } - } - - if (currentPeer -> outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID) - host -> headerFlags |= currentPeer -> outgoingSessionID << ENET_PROTOCOL_HEADER_SESSION_SHIFT; - header -> peerID = ENET_HOST_TO_NET_16 (currentPeer -> outgoingPeerID | host -> headerFlags); - if (host -> checksum != NULL) - { - enet_uint32 * checksum = (enet_uint32 *) & headerData [host -> buffers -> dataLength]; - * checksum = currentPeer -> outgoingPeerID < ENET_PROTOCOL_MAXIMUM_PEER_ID ? currentPeer -> connectID : 0; - host -> buffers -> dataLength += sizeof (enet_uint32); - * checksum = host -> checksum (host -> buffers, host -> bufferCount); - } - - if (shouldCompress > 0) - { - host -> buffers [1].data = host -> packetData [1]; - host -> buffers [1].dataLength = shouldCompress; - host -> bufferCount = 2; - } - - currentPeer -> lastSendTime = host -> serviceTime; - - sentLength = enet_socket_send (host -> socket, & currentPeer -> address, host -> buffers, host -> bufferCount); - - enet_protocol_remove_sent_unreliable_commands (currentPeer); - - if (sentLength < 0) - return -1; - - host -> totalSentData += sentLength; - host -> totalSentPackets ++; - } - - 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) -{ - host -> serviceTime = enet_time_get (); - - enet_protocol_send_outgoing_commands (host, NULL, 0); -} - -/** Checks for any queued events on the host and dispatches one if available. - - @param host host to check for events - @param event an event structure where event details will be placed if available - @retval > 0 if an event was dispatched - @retval 0 if no events are available - @retval < 0 on failure - @ingroup host -*/ -int -enet_host_check_events (ENetHost * host, ENetEvent * event) -{ - if (event == NULL) return -1; - - event -> type = ENET_EVENT_TYPE_NONE; - event -> peer = NULL; - event -> packet = NULL; - - return enet_protocol_dispatch_incoming_commands (host, event); -} - -/** 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; - } - } - - host -> serviceTime = enet_time_get (); - - timeout += host -> serviceTime; - - do - { - if (ENET_TIME_DIFFERENCE (host -> serviceTime, 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; - } - } - - host -> serviceTime = enet_time_get (); - - if (ENET_TIME_GREATER_EQUAL (host -> serviceTime, timeout)) - return 0; - - waitCondition = ENET_SOCKET_WAIT_RECEIVE; - - if (enet_socket_wait (host -> socket, & waitCondition, ENET_TIME_DIFFERENCE (timeout, host -> serviceTime)) != 0) - return -1; - - host -> serviceTime = enet_time_get (); - } while (waitCondition == ENET_SOCKET_WAIT_RECEIVE); - - return 0; -} - |