/** @file enet.h @brief ENet public header file */ #ifndef __ENET_ENET_H__ #define __ENET_ENET_H__ #ifdef __cplusplus extern "C" { #endif #include <stdlib.h> #ifdef WIN32 #include "enet/win32.h" #else #include "enet/unix.h" #endif #include "enet/types.h" #include "enet/protocol.h" #include "enet/list.h" #include "enet/callbacks.h" #define ENET_VERSION_MAJOR 1 #define ENET_VERSION_MINOR 3 #define ENET_VERSION_PATCH 0 #define ENET_VERSION_CREATE(major, minor, patch) (((major)<<16) | ((minor)<<8) | (patch)) #define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH) typedef enet_uint32 ENetVersion; typedef enum _ENetSocketType { ENET_SOCKET_TYPE_STREAM = 1, ENET_SOCKET_TYPE_DATAGRAM = 2 } ENetSocketType; typedef enum _ENetSocketWait { ENET_SOCKET_WAIT_NONE = 0, ENET_SOCKET_WAIT_SEND = (1 << 0), ENET_SOCKET_WAIT_RECEIVE = (1 << 1) } ENetSocketWait; typedef enum _ENetSocketOption { ENET_SOCKOPT_NONBLOCK = 1, ENET_SOCKOPT_BROADCAST = 2, ENET_SOCKOPT_RCVBUF = 3, ENET_SOCKOPT_SNDBUF = 4, ENET_SOCKOPT_REUSEADDR = 5 } ENetSocketOption; enum { ENET_HOST_ANY = 0, /**< specifies the default server host */ ENET_HOST_BROADCAST = 0xFFFFFFFF, /**< specifies a subnet-wide broadcast */ ENET_PORT_ANY = 0 /**< specifies that a port should be automatically chosen */ }; /** * Portable internet address structure. * * The host must be specified in network byte-order, and the port must be in host * byte-order. The constant ENET_HOST_ANY may be used to specify the default * server host. The constant ENET_HOST_BROADCAST may be used to specify the * broadcast address (255.255.255.255). This makes sense for enet_host_connect, * but not for enet_host_create. Once a server responds to a broadcast, the * address is updated from ENET_HOST_BROADCAST to the server's actual IP address. */ typedef struct _ENetAddress { enet_uint32 host; enet_uint16 port; } ENetAddress; /** * Packet flag bit constants. * * The host must be specified in network byte-order, and the port must be in * host byte-order. The constant ENET_HOST_ANY may be used to specify the * default server host. @sa ENetPacket */ typedef enum _ENetPacketFlag { /** packet must be received by the target peer and resend attempts should be * made until the packet is delivered */ ENET_PACKET_FLAG_RELIABLE = (1 << 0), /** packet will not be sequenced with other packets * not supported for reliable packets */ ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1), /** packet will not allocate data, and user must supply it instead */ ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2) } ENetPacketFlag; struct _ENetPacket; typedef void (ENET_CALLBACK * ENetPacketFreeCallback) (struct _ENetPacket *); /** * ENet packet structure. * * An ENet data packet that may be sent to or received from a peer. The shown * fields should only be read and never modified. The data field contains the * allocated data for the packet. The dataLength fields specifies the length * of the allocated data. The flags field is either 0 (specifying no flags), * or a bitwise-or of any combination of the following flags: * * ENET_PACKET_FLAG_RELIABLE - packet must be received by the target peer * and resend attempts should be made until the packet is delivered * * ENET_PACKET_FLAG_UNSEQUENCED - packet will not be sequenced with other packets * (not supported for reliable packets) * * ENET_PACKET_FLAG_NO_ALLOCATE - packet will not allocate data, and user must supply it instead @sa ENetPacketFlag */ typedef struct _ENetPacket { size_t referenceCount; /**< internal use only */ enet_uint32 flags; /**< bitwise-or of ENetPacketFlag constants */ enet_uint8 * data; /**< allocated data for packet */ size_t dataLength; /**< length of data */ ENetPacketFreeCallback freeCallback; /**< function to be called when the packet is no longer in use */ } ENetPacket; typedef struct _ENetAcknowledgement { ENetListNode acknowledgementList; enet_uint32 sentTime; ENetProtocol command; } ENetAcknowledgement; typedef struct _ENetOutgoingCommand { ENetListNode outgoingCommandList; enet_uint16 reliableSequenceNumber; enet_uint16 unreliableSequenceNumber; enet_uint32 sentTime; enet_uint32 roundTripTimeout; enet_uint32 roundTripTimeoutLimit; enet_uint32 fragmentOffset; enet_uint16 fragmentLength; enet_uint16 sendAttempts; ENetProtocol command; ENetPacket * packet; } ENetOutgoingCommand; typedef struct _ENetIncomingCommand { ENetListNode incomingCommandList; enet_uint16 reliableSequenceNumber; enet_uint16 unreliableSequenceNumber; ENetProtocol command; enet_uint32 fragmentCount; enet_uint32 fragmentsRemaining; enet_uint32 * fragments; ENetPacket * packet; } ENetIncomingCommand; typedef enum _ENetPeerState { ENET_PEER_STATE_DISCONNECTED = 0, ENET_PEER_STATE_CONNECTING = 1, ENET_PEER_STATE_ACKNOWLEDGING_CONNECT = 2, ENET_PEER_STATE_CONNECTION_PENDING = 3, ENET_PEER_STATE_CONNECTION_SUCCEEDED = 4, ENET_PEER_STATE_CONNECTED = 5, ENET_PEER_STATE_DISCONNECT_LATER = 6, ENET_PEER_STATE_DISCONNECTING = 7, ENET_PEER_STATE_ACKNOWLEDGING_DISCONNECT = 8, ENET_PEER_STATE_ZOMBIE = 9 } ENetPeerState; #ifndef ENET_BUFFER_MAXIMUM #define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS) #endif enum { ENET_HOST_RECEIVE_BUFFER_SIZE = 256 * 1024, ENET_HOST_SEND_BUFFER_SIZE = 256 * 1024, ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000, ENET_HOST_DEFAULT_MTU = 1400, ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 500, ENET_PEER_DEFAULT_PACKET_THROTTLE = 32, ENET_PEER_PACKET_THROTTLE_SCALE = 32, ENET_PEER_PACKET_THROTTLE_COUNTER = 7, ENET_PEER_PACKET_THROTTLE_ACCELERATION = 2, ENET_PEER_PACKET_THROTTLE_DECELERATION = 2, ENET_PEER_PACKET_THROTTLE_INTERVAL = 5000, ENET_PEER_PACKET_LOSS_SCALE = (1 << 16), ENET_PEER_PACKET_LOSS_INTERVAL = 10000, ENET_PEER_WINDOW_SIZE_SCALE = 64 * 1024, ENET_PEER_TIMEOUT_LIMIT = 32, ENET_PEER_TIMEOUT_MINIMUM = 5000, ENET_PEER_TIMEOUT_MAXIMUM = 30000, ENET_PEER_PING_INTERVAL = 500, ENET_PEER_UNSEQUENCED_WINDOWS = 64, ENET_PEER_UNSEQUENCED_WINDOW_SIZE = 1024, ENET_PEER_FREE_UNSEQUENCED_WINDOWS = 32, ENET_PEER_RELIABLE_WINDOWS = 16, ENET_PEER_RELIABLE_WINDOW_SIZE = 0x1000, ENET_PEER_FREE_RELIABLE_WINDOWS = 8 }; typedef struct _ENetChannel { enet_uint16 outgoingReliableSequenceNumber; enet_uint16 outgoingUnreliableSequenceNumber; enet_uint16 usedReliableWindows; enet_uint16 reliableWindows [ENET_PEER_RELIABLE_WINDOWS]; enet_uint16 incomingReliableSequenceNumber; ENetList incomingReliableCommands; ENetList incomingUnreliableCommands; } ENetChannel; /** * An ENet peer which data packets may be sent or received from. * * No fields should be modified unless otherwise specified. */ typedef struct _ENetPeer { ENetListNode dispatchList; struct _ENetHost * host; enet_uint16 outgoingPeerID; enet_uint16 incomingPeerID; enet_uint32 connectID; enet_uint8 outgoingSessionID; enet_uint8 incomingSessionID; ENetAddress address; /**< Internet address of the peer */ void * data; /**< Application private data, may be freely modified */ ENetPeerState state; ENetChannel * channels; size_t channelCount; /**< Number of channels allocated for communication with peer */ enet_uint32 incomingBandwidth; /**< Downstream bandwidth of the client in bytes/second */ enet_uint32 outgoingBandwidth; /**< Upstream bandwidth of the client in bytes/second */ enet_uint32 incomingBandwidthThrottleEpoch; enet_uint32 outgoingBandwidthThrottleEpoch; enet_uint32 incomingDataTotal; enet_uint32 outgoingDataTotal; enet_uint32 lastSendTime; enet_uint32 lastReceiveTime; enet_uint32 nextTimeout; enet_uint32 earliestTimeout; enet_uint32 packetLossEpoch; enet_uint32 packetsSent; enet_uint32 packetsLost; enet_uint32 packetLoss; /**< mean packet loss of reliable packets as a ratio with respect to the constant ENET_PEER_PACKET_LOSS_SCALE */ enet_uint32 packetLossVariance; enet_uint32 packetThrottle; enet_uint32 packetThrottleLimit; enet_uint32 packetThrottleCounter; enet_uint32 packetThrottleEpoch; enet_uint32 packetThrottleAcceleration; enet_uint32 packetThrottleDeceleration; enet_uint32 packetThrottleInterval; enet_uint32 lastRoundTripTime; enet_uint32 lowestRoundTripTime; enet_uint32 lastRoundTripTimeVariance; enet_uint32 highestRoundTripTimeVariance; enet_uint32 roundTripTime; /**< mean round trip time (RTT), in milliseconds, between sending a reliable packet and receiving its acknowledgement */ enet_uint32 roundTripTimeVariance; enet_uint32 mtu; enet_uint32 windowSize; enet_uint32 reliableDataInTransit; enet_uint16 outgoingReliableSequenceNumber; ENetList acknowledgements; ENetList sentReliableCommands; ENetList sentUnreliableCommands; ENetList outgoingReliableCommands; ENetList outgoingUnreliableCommands; ENetList dispatchedCommands; int needsDispatch; enet_uint16 incomingUnsequencedGroup; enet_uint16 outgoingUnsequencedGroup; enet_uint32 unsequencedWindow [ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32]; enet_uint32 eventData; } ENetPeer; /** An ENet packet compressor for compressing UDP packets before socket sends or receives. */ typedef struct _ENetCompressor { /** Context data for the compressor. Must be non-NULL. */ void * context; /** Compresses from inBuffers[0:inBufferCount-1], containing inLimit bytes, to outData, outputting at most outLimit bytes. Should return 0 on failure. */ size_t (ENET_CALLBACK * compress) (void * context, const ENetBuffer * inBuffers, size_t inBufferCount, size_t inLimit, enet_uint8 * outData, size_t outLimit); /** Decompresses from inData, containing inLimit bytes, to outData, outputting at most outLimit bytes. Should return 0 on failure. */ size_t (ENET_CALLBACK * decompress) (void * context, const enet_uint8 * inData, size_t inLimit, enet_uint8 * outData, size_t outLimit); /** Destroys the context when compression is disabled or the host is destroyed. May be NULL. */ void (ENET_CALLBACK * destroy) (void * context); } ENetCompressor; /** Callback that computes the checksum of the data held in buffers[0:bufferCount-1] */ typedef enet_uint32 (ENET_CALLBACK * ENetChecksumCallback) (const ENetBuffer * buffers, size_t bufferCount); /** An ENet host for communicating with peers. * * No fields should be modified unless otherwise stated. @sa enet_host_create() @sa enet_host_destroy() @sa enet_host_connect() @sa enet_host_service() @sa enet_host_flush() @sa enet_host_broadcast() @sa enet_host_compress() @sa enet_host_compress_with_range_coder() @sa enet_host_channel_limit() @sa enet_host_bandwidth_limit() @sa enet_host_bandwidth_throttle() */ typedef struct _ENetHost { ENetSocket socket; ENetAddress address; /**< Internet address of the host */ enet_uint32 incomingBandwidth; /**< downstream bandwidth of the host */ enet_uint32 outgoingBandwidth; /**< upstream bandwidth of the host */ enet_uint32 bandwidthThrottleEpoch; enet_uint32 mtu; enet_uint32 randomSeed; int recalculateBandwidthLimits; ENetPeer * peers; /**< array of peers allocated for this host */ size_t peerCount; /**< number of peers allocated for this host */ size_t channelLimit; /**< maximum number of channels allowed for connected peers */ enet_uint32 serviceTime; ENetList dispatchQueue; int continueSending; size_t packetSize; enet_uint16 headerFlags; ENetProtocol commands [ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS]; size_t commandCount; ENetBuffer buffers [ENET_BUFFER_MAXIMUM]; size_t bufferCount; ENetChecksumCallback checksum; /**< callback the user can set to enable packet checksums for this host */ ENetCompressor compressor; enet_uint8 packetData [2][ENET_PROTOCOL_MAXIMUM_MTU]; ENetAddress receivedAddress; enet_uint8 * receivedData; size_t receivedDataLength; enet_uint32 totalSentData; /**< total data sent, user should reset to 0 as needed to prevent overflow */ enet_uint32 totalSentPackets; /**< total UDP packets sent, user should reset to 0 as needed to prevent overflow */ enet_uint32 totalReceivedData; /**< total data received, user should reset to 0 as needed to prevent overflow */ enet_uint32 totalReceivedPackets; /**< total UDP packets received, user should reset to 0 as needed to prevent overflow */ } ENetHost; /** * An ENet event type, as specified in @ref ENetEvent. */ typedef enum _ENetEventType { /** no event occurred within the specified time limit */ ENET_EVENT_TYPE_NONE = 0, /** a connection request initiated by enet_host_connect has completed. * The peer field contains the peer which successfully connected. */ ENET_EVENT_TYPE_CONNECT = 1, /** a peer has disconnected. This event is generated on a successful * completion of a disconnect initiated by enet_pper_disconnect, if * a peer has timed out, or if a connection request intialized by * enet_host_connect has timed out. The peer field contains the peer * which disconnected. The data field contains user supplied data * describing the disconnection, or 0, if none is available. */ ENET_EVENT_TYPE_DISCONNECT = 2, /** a packet has been received from a peer. The peer field specifies the * peer which sent the packet. The channelID field specifies the channel * number upon which the packet was received. The packet field contains * the packet that was received; this packet must be destroyed with * enet_packet_destroy after use. */ ENET_EVENT_TYPE_RECEIVE = 3 } ENetEventType; /** * An ENet event as returned by enet_host_service(). @sa enet_host_service */ typedef struct _ENetEvent { ENetEventType type; /**< type of the event */ ENetPeer * peer; /**< peer that generated a connect, disconnect or receive event */ enet_uint8 channelID; /**< channel on the peer that generated the event, if appropriate */ enet_uint32 data; /**< data associated with the event, if appropriate */ ENetPacket * packet; /**< packet associated with the event, if appropriate */ } ENetEvent; /** @defgroup global ENet global functions @{ */ /** Initializes ENet globally. Must be called prior to using any functions in ENet. @returns 0 on success, < 0 on failure */ ENET_API int enet_initialize (void); /** Initializes ENet globally and supplies user-overridden callbacks. Must be called prior to using any functions in ENet. Do not use enet_initialize() if you use this variant. Make sure the ENetCallbacks structure is zeroed out so that any additional callbacks added in future versions will be properly ignored. @param version the constant ENET_VERSION should be supplied so ENet knows which version of ENetCallbacks struct to use @param inits user-overriden callbacks where any NULL callbacks will use ENet's defaults @returns 0 on success, < 0 on failure */ ENET_API int enet_initialize_with_callbacks (ENetVersion version, const ENetCallbacks * inits); /** Shuts down ENet globally. Should be called when a program that has initialized ENet exits. */ ENET_API void enet_deinitialize (void); /** @} */ /** @defgroup private ENet private implementation functions */ /** Returns the wall-time in milliseconds. Its initial value is unspecified unless otherwise set. */ ENET_API enet_uint32 enet_time_get (void); /** Sets the current wall-time in milliseconds. */ ENET_API void enet_time_set (enet_uint32); /** @defgroup socket ENet socket functions @{ */ ENET_API ENetSocket enet_socket_create (ENetSocketType); ENET_API int enet_socket_bind (ENetSocket, const ENetAddress *); ENET_API int enet_socket_listen (ENetSocket, int); ENET_API ENetSocket enet_socket_accept (ENetSocket, ENetAddress *); ENET_API int enet_socket_connect (ENetSocket, const ENetAddress *); ENET_API int enet_socket_send (ENetSocket, const ENetAddress *, const ENetBuffer *, size_t); ENET_API int enet_socket_receive (ENetSocket, ENetAddress *, ENetBuffer *, size_t); ENET_API int enet_socket_wait (ENetSocket, enet_uint32 *, enet_uint32); ENET_API int enet_socket_set_option (ENetSocket, ENetSocketOption, int); ENET_API void enet_socket_destroy (ENetSocket); ENET_API int enet_socketset_select (ENetSocket, ENetSocketSet *, ENetSocketSet *, enet_uint32); /** @} */ /** @defgroup Address ENet address functions @{ */ /** Attempts to resolve the host named by the parameter hostName and sets the host field in the address parameter if successful. @param address destination to store resolved address @param hostName host name to lookup @retval 0 on success @retval < 0 on failure @returns the address of the given hostName in address on success */ ENET_API int enet_address_set_host (ENetAddress * address, const char * hostName); /** Gives the printable form of the ip address specified in the address parameter. @param address address printed @param hostName destination for name, must not be NULL @param nameLength maximum length of hostName. @returns the null-terminated name of the host in hostName on success @retval 0 on success @retval < 0 on failure */ ENET_API int enet_address_get_host_ip (const ENetAddress * address, char * hostName, size_t nameLength); /** Attempts to do a reverse lookup of the host field in the address parameter. @param address address used for reverse lookup @param hostName destination for name, must not be NULL @param nameLength maximum length of hostName. @returns the null-terminated name of the host in hostName on success @retval 0 on success @retval < 0 on failure */ ENET_API int enet_address_get_host (const ENetAddress * address, char * hostName, size_t nameLength); /** @} */ ENET_API ENetPacket * enet_packet_create (const void *, size_t, enet_uint32); ENET_API void enet_packet_destroy (ENetPacket *); ENET_API int enet_packet_resize (ENetPacket *, size_t); extern enet_uint32 enet_crc32 (const ENetBuffer *, size_t); ENET_API ENetHost * enet_host_create (const ENetAddress *, size_t, size_t, enet_uint32, enet_uint32); ENET_API void enet_host_destroy (ENetHost *); ENET_API ENetPeer * enet_host_connect (ENetHost *, const ENetAddress *, size_t, enet_uint32); ENET_API int enet_host_check_events (ENetHost *, ENetEvent *); ENET_API int enet_host_service (ENetHost *, ENetEvent *, enet_uint32); ENET_API void enet_host_flush (ENetHost *); ENET_API void enet_host_broadcast (ENetHost *, enet_uint8, ENetPacket *); ENET_API void enet_host_compress (ENetHost *, const ENetCompressor *); ENET_API int enet_host_compress_with_range_coder (ENetHost * host); ENET_API void enet_host_channel_limit (ENetHost *, size_t); ENET_API void enet_host_bandwidth_limit (ENetHost *, enet_uint32, enet_uint32); extern void enet_host_bandwidth_throttle (ENetHost *); ENET_API int enet_peer_send (ENetPeer *, enet_uint8, ENetPacket *); ENET_API ENetPacket * enet_peer_receive (ENetPeer *, enet_uint8 * channelID); ENET_API void enet_peer_ping (ENetPeer *); ENET_API void enet_peer_reset (ENetPeer *); ENET_API void enet_peer_disconnect (ENetPeer *, enet_uint32); ENET_API void enet_peer_disconnect_now (ENetPeer *, enet_uint32); ENET_API void enet_peer_disconnect_later (ENetPeer *, enet_uint32); ENET_API void enet_peer_throttle_configure (ENetPeer *, enet_uint32, enet_uint32, enet_uint32); extern int enet_peer_throttle (ENetPeer *, enet_uint32); extern void enet_peer_reset_queues (ENetPeer *); extern void enet_peer_setup_outgoing_command (ENetPeer *, ENetOutgoingCommand *); extern ENetOutgoingCommand * enet_peer_queue_outgoing_command (ENetPeer *, const ENetProtocol *, ENetPacket *, enet_uint32, enet_uint16); extern ENetIncomingCommand * enet_peer_queue_incoming_command (ENetPeer *, const ENetProtocol *, ENetPacket *, enet_uint32); extern ENetAcknowledgement * enet_peer_queue_acknowledgement (ENetPeer *, const ENetProtocol *, enet_uint16); extern void enet_peer_dispatch_incoming_unreliable_commands (ENetPeer *, ENetChannel *); extern void enet_peer_dispatch_incoming_reliable_commands (ENetPeer *, ENetChannel *); ENET_API void * enet_range_coder_create (void); ENET_API void enet_range_coder_destroy (void *); ENET_API size_t enet_range_coder_compress (void *, const ENetBuffer *, size_t, size_t, enet_uint8 *, size_t); ENET_API size_t enet_range_coder_decompress (void *, const enet_uint8 *, size_t, enet_uint8 *, size_t); extern size_t enet_protocol_command_size (enet_uint8); #ifdef __cplusplus } #endif #endif /* __ENET_ENET_H__ */