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enet.h
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/*
* ENet reliable UDP networking library
* Copyright (c) 2018 Lee Salzman, Vladyslav Hrytsenko, Dominik Madarász, Stanislav Denisov
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef ENET_H
#define ENET_H
#include <stdlib.h>
#include <stdbool.h>
#include <stdint.h>
#include <time.h>
#define ENET_VERSION_MAJOR 2
#define ENET_VERSION_MINOR 4
#define ENET_VERSION_PATCH 7
#define ENET_VERSION_CREATE(major, minor, patch) (((major) << 16) | ((minor) << 8) | (patch))
#define ENET_VERSION_GET_MAJOR(version) (((version) >> 16) & 0xFF)
#define ENET_VERSION_GET_MINOR(version) (((version) >> 8) & 0xFF)
#define ENET_VERSION_GET_PATCH(version) ((version) & 0xFF)
#define ENET_VERSION ENET_VERSION_CREATE(ENET_VERSION_MAJOR, ENET_VERSION_MINOR, ENET_VERSION_PATCH)
#define ENET_TIME_OVERFLOW 86400000
#define ENET_TIME_LESS(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW)
#define ENET_TIME_GREATER(a, b) ((b) - (a) >= ENET_TIME_OVERFLOW)
#define ENET_TIME_LESS_EQUAL(a, b) (!ENET_TIME_GREATER(a, b))
#define ENET_TIME_GREATER_EQUAL(a, b) (!ENET_TIME_LESS(a, b))
#define ENET_TIME_DIFFERENCE(a, b) ((a) - (b) >= ENET_TIME_OVERFLOW ? (b) - (a) : (a) - (b))
#define ENET_MAX(x, y) ((x) > (y) ? (x) : (y))
#define ENET_MIN(x, y) ((x) < (y) ? (x) : (y))
/*
=======================================================================
System differences
=======================================================================
*/
#ifdef _WIN32
#ifndef ENET_NO_PRAGMA_LINK
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "winmm.lib")
#endif
#if _MSC_VER >= 1910
/* It looks like there were changes as of Visual Studio 2017 and there are no 32/64 bit
versions of _InterlockedExchange[operation], only InterlockedExchange[operation]
(without leading underscore), so we have to distinguish between compiler versions */
#define ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
#endif
#include <winsock2.h>
#include <ws2tcpip.h>
#include <mmsystem.h>
#include <intrin.h>
#if defined(_WIN32) && defined(_MSC_VER)
#if _MSC_VER < 1900
typedef struct timespec {
long tv_sec;
long tv_nsec;
};
#endif
#define CLOCK_MONOTONIC 0
#endif
typedef SOCKET ENetSocket;
#define ENET_SOCKET_NULL INVALID_SOCKET
typedef struct {
size_t dataLength;
void* data;
} ENetBuffer;
#define ENET_CALLBACK __cdecl
#ifdef ENET_DLL
#ifdef ENET_IMPLEMENTATION
#define ENET_API __declspec(dllexport)
#else
#define ENET_API __declspec(dllimport)
#endif
#else
#define ENET_API extern
#endif
#else
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <poll.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#ifdef __APPLE__
#include <mach/clock.h>
#include <mach/mach.h>
#include <Availability.h>
#endif
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
#ifdef MSG_MAXIOVLEN
#define ENET_BUFFER_MAXIMUM MSG_MAXIOVLEN
#endif
typedef int ENetSocket;
#define ENET_SOCKET_NULL -1
typedef struct {
void* data;
size_t dataLength;
} ENetBuffer;
#define ENET_CALLBACK
#define ENET_API extern
#endif
#ifndef ENET_BUFFER_MAXIMUM
#define ENET_BUFFER_MAXIMUM (1 + 2 * ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS)
#endif
#define ENET_HOST_ANY in6addr_any
#define ENET_PORT_ANY 0
#define ENET_HOST_SIZE 1025
#define ENET_HOST_TO_NET_16(value) (htons(value))
#define ENET_HOST_TO_NET_32(value) (htonl(value))
#define ENET_NET_TO_HOST_16(value) (ntohs(value))
#define ENET_NET_TO_HOST_32(value) (ntohl(value))
#if __BIG_ENDIAN__
#define ENET_HOST_TO_NET_64(x) (x)
#define ENET_NET_TO_HOST_64(x) (x)
#else
#define ENET_HOST_TO_NET_64(x) (((uint64_t)htonl((x) & 0xFFFFFFFF) << 32) | htonl((x) >> 32))
#define ENET_NET_TO_HOST_64(x) (((uint64_t)ntohl((x) & 0xFFFFFFFF) << 32) | ntohl((x) >> 32))
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*
=======================================================================
Internals
=======================================================================
*/
typedef uint32_t ENetVersion;
typedef fd_set ENetSocketSet;
typedef struct _ENetCallbacks {
void* (ENET_CALLBACK* malloc)(size_t size);
void (ENET_CALLBACK* free)(void* memory);
void (ENET_CALLBACK* noMemory)(void);
} ENetCallbacks;
extern void* enet_malloc(size_t);
extern void enet_free(void*);
typedef struct _ENetListNode {
struct _ENetListNode* next;
struct _ENetListNode* previous;
} ENetListNode;
typedef ENetListNode* ENetListIterator;
typedef struct _ENetList {
ENetListNode sentinel;
} ENetList;
extern ENetListIterator enet_list_insert(ENetListIterator, void*);
extern ENetListIterator enet_list_move(ENetListIterator, void*, void*);
extern void* enet_list_remove(ENetListIterator);
extern void enet_list_clear(ENetList*);
extern size_t enet_list_size(ENetList*);
#define enet_list_begin(list) ((list)->sentinel.next)
#define enet_list_end(list) (&(list)->sentinel)
#define enet_list_empty(list) (enet_list_begin(list) == enet_list_end(list))
#define enet_list_next(iterator) ((iterator)->next)
#define enet_list_previous(iterator) ((iterator)->previous)
#define enet_list_front(list) ((void*)(list)->sentinel.next)
#define enet_list_back(list) ((void*)(list)->sentinel.previous)
#define enet_in6_equal(a, b) (memcmp(&a, &b, sizeof(struct in6_addr)) == 0)
/*
=======================================================================
Protocol
=======================================================================
*/
enum {
ENET_PROTOCOL_MINIMUM_MTU = 576,
ENET_PROTOCOL_MAXIMUM_MTU = 4096,
ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS = 32,
ENET_PROTOCOL_MINIMUM_WINDOW_SIZE = 4096,
ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE = 65536,
ENET_PROTOCOL_MINIMUM_CHANNEL_COUNT = 1,
ENET_PROTOCOL_MAXIMUM_CHANNEL_COUNT = 255,
ENET_PROTOCOL_MAXIMUM_PEER_ID = 0xFFF,
ENET_PROTOCOL_MAXIMUM_FRAGMENT_COUNT = 1024 * 1024
};
typedef enum _ENetProtocolCommand {
ENET_PROTOCOL_COMMAND_NONE = 0,
ENET_PROTOCOL_COMMAND_ACKNOWLEDGE = 1,
ENET_PROTOCOL_COMMAND_CONNECT = 2,
ENET_PROTOCOL_COMMAND_VERIFY_CONNECT = 3,
ENET_PROTOCOL_COMMAND_DISCONNECT = 4,
ENET_PROTOCOL_COMMAND_PING = 5,
ENET_PROTOCOL_COMMAND_SEND_RELIABLE = 6,
ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE = 7,
ENET_PROTOCOL_COMMAND_SEND_FRAGMENT = 8,
ENET_PROTOCOL_COMMAND_SEND_UNSEQUENCED = 9,
ENET_PROTOCOL_COMMAND_BANDWIDTH_LIMIT = 10,
ENET_PROTOCOL_COMMAND_THROTTLE_CONFIGURE = 11,
ENET_PROTOCOL_COMMAND_SEND_UNRELIABLE_FRAGMENT = 12,
ENET_PROTOCOL_COMMAND_COUNT = 13,
ENET_PROTOCOL_COMMAND_MASK = 0x0F
} ENetProtocolCommand;
typedef enum _ENetProtocolFlag {
ENET_PROTOCOL_COMMAND_FLAG_ACKNOWLEDGE = (1 << 7),
ENET_PROTOCOL_COMMAND_FLAG_UNSEQUENCED = (1 << 6),
ENET_PROTOCOL_HEADER_FLAG_SENT_TIME = (1 << 14),
ENET_PROTOCOL_HEADER_FLAG_MASK = ENET_PROTOCOL_HEADER_FLAG_SENT_TIME,
ENET_PROTOCOL_HEADER_SESSION_MASK = (3 << 12),
ENET_PROTOCOL_HEADER_SESSION_SHIFT = 12
} ENetProtocolFlag;
#ifdef _MSC_VER
#pragma pack(push, 1)
#define ENET_PACKED
#elif defined(__GNUC__) || defined(__clang__)
#define ENET_PACKED __attribute__ ((packed))
#else
#define ENET_PACKED
#endif
typedef struct _ENetProtocolHeader {
uint16_t peerID;
uint16_t sentTime;
} ENET_PACKED ENetProtocolHeader;
typedef struct _ENetProtocolCommandHeader {
uint8_t command;
uint8_t channelID;
uint16_t reliableSequenceNumber;
} ENET_PACKED ENetProtocolCommandHeader;
typedef struct _ENetProtocolAcknowledge {
ENetProtocolCommandHeader header;
uint16_t receivedReliableSequenceNumber;
uint16_t receivedSentTime;
} ENET_PACKED ENetProtocolAcknowledge;
typedef struct _ENetProtocolConnect {
ENetProtocolCommandHeader header;
uint16_t outgoingPeerID;
uint8_t incomingSessionID;
uint8_t outgoingSessionID;
uint32_t mtu;
uint32_t windowSize;
uint32_t channelCount;
uint32_t incomingBandwidth;
uint32_t outgoingBandwidth;
uint32_t packetThrottleInterval;
uint32_t packetThrottleAcceleration;
uint32_t packetThrottleDeceleration;
uint32_t connectID;
uint32_t data;
} ENET_PACKED ENetProtocolConnect;
typedef struct _ENetProtocolVerifyConnect {
ENetProtocolCommandHeader header;
uint16_t outgoingPeerID;
uint8_t incomingSessionID;
uint8_t outgoingSessionID;
uint32_t mtu;
uint32_t windowSize;
uint32_t channelCount;
uint32_t incomingBandwidth;
uint32_t outgoingBandwidth;
uint32_t packetThrottleInterval;
uint32_t packetThrottleAcceleration;
uint32_t packetThrottleDeceleration;
uint32_t connectID;
} ENET_PACKED ENetProtocolVerifyConnect;
typedef struct _ENetProtocolBandwidthLimit {
ENetProtocolCommandHeader header;
uint32_t incomingBandwidth;
uint32_t outgoingBandwidth;
} ENET_PACKED ENetProtocolBandwidthLimit;
typedef struct _ENetProtocolThrottleConfigure {
ENetProtocolCommandHeader header;
uint32_t packetThrottleInterval;
uint32_t packetThrottleAcceleration;
uint32_t packetThrottleDeceleration;
} ENET_PACKED ENetProtocolThrottleConfigure;
typedef struct _ENetProtocolDisconnect {
ENetProtocolCommandHeader header;
uint32_t data;
} ENET_PACKED ENetProtocolDisconnect;
typedef struct _ENetProtocolPing {
ENetProtocolCommandHeader header;
} ENET_PACKED ENetProtocolPing;
typedef struct _ENetProtocolSendReliable {
ENetProtocolCommandHeader header;
uint16_t dataLength;
} ENET_PACKED ENetProtocolSendReliable;
typedef struct _ENetProtocolSendUnreliable {
ENetProtocolCommandHeader header;
uint16_t unreliableSequenceNumber;
uint16_t dataLength;
} ENET_PACKED ENetProtocolSendUnreliable;
typedef struct _ENetProtocolSendUnsequenced {
ENetProtocolCommandHeader header;
uint16_t unsequencedGroup;
uint16_t dataLength;
} ENET_PACKED ENetProtocolSendUnsequenced;
typedef struct _ENetProtocolSendFragment {
ENetProtocolCommandHeader header;
uint16_t startSequenceNumber;
uint16_t dataLength;
uint32_t fragmentCount;
uint32_t fragmentNumber;
uint32_t totalLength;
uint32_t fragmentOffset;
} ENET_PACKED ENetProtocolSendFragment;
typedef union _ENetProtocol {
ENetProtocolCommandHeader header;
ENetProtocolAcknowledge acknowledge;
ENetProtocolConnect connect;
ENetProtocolVerifyConnect verifyConnect;
ENetProtocolDisconnect disconnect;
ENetProtocolPing ping;
ENetProtocolSendReliable sendReliable;
ENetProtocolSendUnreliable sendUnreliable;
ENetProtocolSendUnsequenced sendUnsequenced;
ENetProtocolSendFragment sendFragment;
ENetProtocolBandwidthLimit bandwidthLimit;
ENetProtocolThrottleConfigure throttleConfigure;
} ENET_PACKED ENetProtocol;
#ifdef _MSC_VER
#pragma pack(pop)
#endif
/*
=======================================================================
General structs/enums
=======================================================================
*/
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),
ENET_SOCKET_WAIT_INTERRUPT = (1 << 2)
} ENetSocketWait;
typedef enum _ENetSocketOption {
ENET_SOCKOPT_NONBLOCK = 1,
ENET_SOCKOPT_BROADCAST = 2,
ENET_SOCKOPT_RCVBUF = 3,
ENET_SOCKOPT_SNDBUF = 4,
ENET_SOCKOPT_REUSEADDR = 5,
ENET_SOCKOPT_RCVTIMEO = 6,
ENET_SOCKOPT_SNDTIMEO = 7,
ENET_SOCKOPT_ERROR = 8,
ENET_SOCKOPT_NODELAY = 9,
ENET_SOCKOPT_IPV6_V6ONLY = 10
} ENetSocketOption;
typedef enum _ENetSocketShutdown {
ENET_SOCKET_SHUTDOWN_READ = 0,
ENET_SOCKET_SHUTDOWN_WRITE = 1,
ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
} ENetSocketShutdown;
typedef struct _ENetAddress {
union {
struct in6_addr ipv6;
struct {
uint8_t zeros[10];
uint16_t ffff;
struct in_addr ip;
} ipv4;
};
uint16_t port;
} ENetAddress;
typedef enum _ENetPacketFlag {
ENET_PACKET_FLAG_NONE = 0,
ENET_PACKET_FLAG_RELIABLE = (1 << 0),
ENET_PACKET_FLAG_UNSEQUENCED = (1 << 1),
ENET_PACKET_FLAG_NO_ALLOCATE = (1 << 2),
ENET_PACKET_FLAG_UNRELIABLE_FRAGMENTED = (1 << 3),
ENET_PACKET_FLAG_INSTANT = (1 << 4),
ENET_PACKET_FLAG_UNTHROTTLED = (1 << 5),
ENET_PACKET_FLAG_SENT = (1 << 8)
} ENetPacketFlag;
typedef void (ENET_CALLBACK* ENetPacketFreeCallback)(void*);
typedef struct _ENetPacket {
uint32_t flags;
uint32_t dataLength;
uint8_t* data;
ENetPacketFreeCallback freeCallback;
uint32_t referenceCount;
void* userData;
} ENetPacket;
typedef struct _ENetAcknowledgement {
ENetListNode acknowledgementList;
uint32_t sentTime;
ENetProtocol command;
} ENetAcknowledgement;
typedef struct _ENetOutgoingCommand {
ENetListNode outgoingCommandList;
uint16_t reliableSequenceNumber;
uint16_t unreliableSequenceNumber;
uint32_t sentTime;
uint32_t roundTripTimeout;
uint32_t roundTripTimeoutLimit;
uint32_t fragmentOffset;
uint16_t fragmentLength;
uint16_t sendAttempts;
ENetProtocol command;
ENetPacket* packet;
} ENetOutgoingCommand;
typedef struct _ENetIncomingCommand {
ENetListNode incomingCommandList;
uint16_t reliableSequenceNumber;
uint16_t unreliableSequenceNumber;
ENetProtocol command;
uint32_t fragmentCount;
uint32_t fragmentsRemaining;
uint32_t* 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;
enum {
ENET_HOST_BUFFER_SIZE_MIN = 256 * 1024,
ENET_HOST_BUFFER_SIZE_MAX = 1024 * 1024,
ENET_HOST_BANDWIDTH_THROTTLE_INTERVAL = 1000,
ENET_HOST_DEFAULT_MTU = 1280,
ENET_HOST_DEFAULT_MAXIMUM_PACKET_SIZE = 32 * 1024 * 1024,
ENET_HOST_DEFAULT_MAXIMUM_WAITING_DATA = 32 * 1024 * 1024,
ENET_PEER_DEFAULT_ROUND_TRIP_TIME = 1,
ENET_PEER_DEFAULT_PACKET_THROTTLE = 32,
ENET_PEER_PACKET_THROTTLE_THRESHOLD = 40,
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_WINDOW_SIZE_SCALE = 64 * 1024,
ENET_PEER_TIMEOUT_LIMIT = 32,
ENET_PEER_TIMEOUT_MINIMUM = 5000,
ENET_PEER_TIMEOUT_MAXIMUM = 30000,
ENET_PEER_PING_INTERVAL = 250,
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 {
uint16_t outgoingReliableSequenceNumber;
uint16_t outgoingUnreliableSequenceNumber;
uint16_t usedReliableWindows;
uint16_t reliableWindows[ENET_PEER_RELIABLE_WINDOWS];
uint16_t incomingReliableSequenceNumber;
uint16_t incomingUnreliableSequenceNumber;
ENetList incomingReliableCommands;
ENetList incomingUnreliableCommands;
} ENetChannel;
typedef struct _ENetPeer {
ENetListNode dispatchList;
struct _ENetHost* host;
uint16_t outgoingPeerID;
uint16_t incomingPeerID;
uint32_t connectID;
uint8_t outgoingSessionID;
uint8_t incomingSessionID;
ENetAddress address;
void* data;
ENetPeerState state;
ENetChannel* channels;
size_t channelCount;
uint32_t incomingBandwidth;
uint32_t outgoingBandwidth;
uint32_t incomingBandwidthThrottleEpoch;
uint32_t outgoingBandwidthThrottleEpoch;
uint32_t incomingDataTotal;
uint64_t totalDataReceived;
uint32_t outgoingDataTotal;
uint64_t totalDataSent;
uint32_t lastSendTime;
uint32_t lastReceiveTime;
uint32_t nextTimeout;
uint32_t earliestTimeout;
uint64_t totalPacketsSent;
uint64_t totalPacketsLost;
uint32_t packetThrottle;
uint32_t packetThrottleThreshold;
uint32_t packetThrottleLimit;
uint32_t packetThrottleCounter;
uint32_t packetThrottleEpoch;
uint32_t packetThrottleAcceleration;
uint32_t packetThrottleDeceleration;
uint32_t packetThrottleInterval;
uint32_t pingInterval;
uint32_t timeoutLimit;
uint32_t timeoutMinimum;
uint32_t timeoutMaximum;
uint32_t lastRoundTripTime;
uint32_t lowestRoundTripTime;
uint32_t lastRoundTripTimeVariance;
uint32_t highestRoundTripTimeVariance;
uint32_t roundTripTime;
uint32_t roundTripTimeVariance;
uint32_t mtu;
uint32_t windowSize;
uint32_t reliableDataInTransit;
uint16_t outgoingReliableSequenceNumber;
ENetList acknowledgements;
ENetList sentReliableCommands;
ENetList sentUnreliableCommands;
ENetList outgoingCommands;
ENetList dispatchedCommands;
int needsDispatch;
uint16_t incomingUnsequencedGroup;
uint16_t outgoingUnsequencedGroup;
uint32_t unsequencedWindow[ENET_PEER_UNSEQUENCED_WINDOW_SIZE / 32];
uint32_t eventData;
size_t totalWaitingData;
} ENetPeer;
typedef enum _ENetEventType {
ENET_EVENT_TYPE_NONE = 0,
ENET_EVENT_TYPE_CONNECT = 1,
ENET_EVENT_TYPE_DISCONNECT = 2,
ENET_EVENT_TYPE_RECEIVE = 3,
ENET_EVENT_TYPE_DISCONNECT_TIMEOUT = 4
} ENetEventType;
typedef struct _ENetEvent {
ENetEventType type;
ENetPeer* peer;
uint8_t channelID;
uint32_t data;
ENetPacket* packet;
} ENetEvent;
typedef uint64_t(ENET_CALLBACK* ENetChecksumCallback)(const ENetBuffer* buffers, int bufferCount);
typedef int (ENET_CALLBACK* ENetInterceptCallback)(ENetEvent* event, ENetAddress* address, uint8_t* receivedData, int receivedDataLength);
typedef struct _ENetHost {
ENetSocket socket;
ENetAddress address;
uint32_t incomingBandwidth;
uint32_t outgoingBandwidth;
uint32_t bandwidthThrottleEpoch;
uint32_t mtu;
uint32_t randomSeed;
int recalculateBandwidthLimits;
uint8_t preventConnections;
ENetPeer* peers;
size_t peerCount;
size_t channelLimit;
uint32_t serviceTime;
ENetList dispatchQueue;
int continueSending;
size_t packetSize;
uint16_t headerFlags;
uint32_t totalSentData;
uint32_t totalSentPackets;
uint32_t totalReceivedData;
uint32_t totalReceivedPackets;
ENetProtocol commands[ENET_PROTOCOL_MAXIMUM_PACKET_COMMANDS];
size_t commandCount;
ENetBuffer buffers[ENET_BUFFER_MAXIMUM];
size_t bufferCount;
ENetChecksumCallback checksumCallback;
uint8_t packetData[2][ENET_PROTOCOL_MAXIMUM_MTU];
ENetAddress receivedAddress;
uint8_t* receivedData;
size_t receivedDataLength;
ENetInterceptCallback interceptCallback;
size_t connectedPeers;
size_t bandwidthLimitedPeers;
size_t duplicatePeers;
size_t maximumPacketSize;
size_t maximumWaitingData;
} ENetHost;
/*
=======================================================================
Public API
=======================================================================
*/
ENET_API int enet_initialize(void);
ENET_API int enet_initialize_with_callbacks(ENetVersion, const ENetCallbacks*);
ENET_API void enet_deinitialize(void);
ENET_API ENetVersion enet_linked_version(void);
ENET_API int enet_array_is_zeroed(const uint8_t*, int);
ENET_API uint32_t enet_time_get(void);
ENET_API uint64_t enet_crc64(const ENetBuffer*, int);
ENET_API ENetPacket* enet_packet_create(const void*, size_t, uint32_t);
ENET_API ENetPacket* enet_packet_create_offset(const void*, size_t, size_t, uint32_t);
ENET_API void enet_packet_destroy(ENetPacket*);
ENET_API int enet_peer_send(ENetPeer*, uint8_t, ENetPacket*);
ENET_API ENetPacket* enet_peer_receive(ENetPeer*, uint8_t*);
ENET_API void enet_peer_ping(ENetPeer*);
ENET_API void enet_peer_ping_interval(ENetPeer*, uint32_t);
ENET_API void enet_peer_timeout(ENetPeer*, uint32_t, uint32_t, uint32_t);
ENET_API void enet_peer_reset(ENetPeer*);
ENET_API void enet_peer_disconnect(ENetPeer*, uint32_t);
ENET_API void enet_peer_disconnect_now(ENetPeer*, uint32_t);
ENET_API void enet_peer_disconnect_later(ENetPeer*, uint32_t);
ENET_API void enet_peer_throttle_configure(ENetPeer*, uint32_t, uint32_t, uint32_t, uint32_t);
ENET_API ENetHost* enet_host_create(const ENetAddress*, size_t, size_t, uint32_t, uint32_t, int);
ENET_API void enet_host_destroy(ENetHost*);
ENET_API void enet_host_prevent_connections(ENetHost*, uint8_t);
ENET_API ENetPeer* enet_host_connect(ENetHost*, const ENetAddress*, size_t, uint32_t);
ENET_API int enet_host_check_events(ENetHost*, ENetEvent*);
ENET_API int enet_host_service(ENetHost*, ENetEvent*, uint32_t);
ENET_API void enet_host_flush(ENetHost*);
ENET_API void enet_host_broadcast(ENetHost*, uint8_t, ENetPacket*);
ENET_API void enet_host_broadcast_exclude(ENetHost*, uint8_t, ENetPacket*, ENetPeer*);
ENET_API void enet_host_broadcast_selective(ENetHost*, uint8_t, ENetPacket*, ENetPeer**, size_t);
ENET_API void enet_host_channel_limit(ENetHost*, size_t);
ENET_API void enet_host_bandwidth_limit(ENetHost*, uint32_t, uint32_t);
ENET_API int enet_address_set_ip(ENetAddress*, const char*);
ENET_API int enet_address_set_hostname(ENetAddress*, const char*);
ENET_API int enet_address_get_ip(const ENetAddress*, char*, size_t);
ENET_API int enet_address_get_hostname(const ENetAddress*, char*, size_t);
ENET_API ENetSocket enet_socket_create(ENetSocketType);
ENET_API int enet_socket_bind(ENetSocket, const ENetAddress*);
ENET_API int enet_socket_get_address(ENetSocket, 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, uint32_t*, uint64_t);
ENET_API int enet_socket_set_option(ENetSocket, ENetSocketOption, int);
ENET_API int enet_socket_get_option(ENetSocket, ENetSocketOption, int*);
ENET_API int enet_socket_shutdown(ENetSocket, ENetSocketShutdown);
ENET_API void enet_socket_destroy(ENetSocket);
ENET_API int enet_socket_set_select(ENetSocket, ENetSocketSet*, ENetSocketSet*, uint32_t);
/* Extended API for easier binding in other programming languages */
ENET_API void* enet_packet_get_data(const ENetPacket*);
ENET_API void* enet_packet_get_user_data(const ENetPacket*);
ENET_API void enet_packet_set_user_data(ENetPacket*, void* userData);
ENET_API int enet_packet_get_length(const ENetPacket*);
ENET_API void enet_packet_set_free_callback(ENetPacket*, ENetPacketFreeCallback);
ENET_API int enet_packet_check_references(const ENetPacket*);
ENET_API void enet_packet_dispose(ENetPacket*);
ENET_API uint32_t enet_host_get_peers_count(const ENetHost*);
ENET_API uint32_t enet_host_get_packets_sent(const ENetHost*);
ENET_API uint32_t enet_host_get_packets_received(const ENetHost*);
ENET_API uint32_t enet_host_get_bytes_sent(const ENetHost*);
ENET_API uint32_t enet_host_get_bytes_received(const ENetHost*);
ENET_API void enet_host_set_max_duplicate_peers(ENetHost*, uint16_t);
ENET_API void enet_host_set_intercept_callback(ENetHost*, ENetInterceptCallback);
ENET_API void enet_host_set_checksum_callback(ENetHost*, ENetChecksumCallback);
ENET_API uint32_t enet_peer_get_id(const ENetPeer*);
ENET_API int enet_peer_get_ip(const ENetPeer*, char*, size_t);
ENET_API uint16_t enet_peer_get_port(const ENetPeer*);
ENET_API uint32_t enet_peer_get_mtu(const ENetPeer*);
ENET_API ENetPeerState enet_peer_get_state(const ENetPeer*);
ENET_API uint32_t enet_peer_get_rtt(const ENetPeer*);
ENET_API uint32_t enet_peer_get_last_rtt(const ENetPeer* peer);
ENET_API uint32_t enet_peer_get_lastsendtime(const ENetPeer*);
ENET_API uint32_t enet_peer_get_lastreceivetime(const ENetPeer*);
ENET_API uint64_t enet_peer_get_packets_sent(const ENetPeer*);
ENET_API uint64_t enet_peer_get_packets_lost(const ENetPeer*);
ENET_API float enet_peer_get_packets_throttle(const ENetPeer*);
ENET_API uint64_t enet_peer_get_bytes_sent(const ENetPeer*);
ENET_API uint64_t enet_peer_get_bytes_received(const ENetPeer*);
ENET_API void* enet_peer_get_data(const ENetPeer*);
ENET_API void enet_peer_set_data(ENetPeer*, const void*);
/*
=======================================================================
Private API
=======================================================================
*/
extern void enet_host_bandwidth_throttle(ENetHost*);
extern uint64_t enet_host_random_seed(void);
extern int enet_peer_throttle(ENetPeer*, uint32_t);
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*, uint32_t, uint16_t);
extern ENetIncomingCommand* enet_peer_queue_incoming_command(ENetPeer*, const ENetProtocol*, const void*, size_t, uint32_t, uint32_t);
extern ENetAcknowledgement* enet_peer_queue_acknowledgement(ENetPeer*, const ENetProtocol*, uint16_t);
extern void enet_peer_dispatch_incoming_unreliable_commands(ENetPeer*, ENetChannel*, ENetIncomingCommand*);
extern void enet_peer_dispatch_incoming_reliable_commands(ENetPeer*, ENetChannel*, ENetIncomingCommand*);
extern void enet_peer_on_connect(ENetPeer*);
extern void enet_peer_on_disconnect(ENetPeer*);
extern size_t enet_protocol_command_size(uint8_t);
#ifdef __cplusplus
}
#endif
#if defined(ENET_IMPLEMENTATION) && !defined(ENET_IMPLEMENTATION_DONE)
#define ENET_IMPLEMENTATION_DONE 1
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4244) /* 64-bit to 32-bit integer conversion */
#pragma warning(disable: 4267) /* size_t to integer conversion */
#endif
/*
=======================================================================
Atomics
=======================================================================
*/
#ifdef _MSC_VER
#define ENET_AT_CASSERT_PRED(predicate) sizeof(char[2 * !!(predicate) - 1])
#define ENET_IS_SUPPORTED_ATOMIC(size) ENET_AT_CASSERT_PRED(size == 1 || size == 2 || size == 4 || size == 8)
#define ENET_ATOMIC_SIZEOF(variable) (ENET_IS_SUPPORTED_ATOMIC(sizeof(*(variable))), sizeof(*(variable)))
__inline int64_t enet_at_atomic_read(char* ptr, size_t size) {
switch (size) {
case 1:
return _InterlockedExchangeAdd8((volatile char*)ptr, 0);
case 2:
return _InterlockedExchangeAdd16((volatile SHORT*)ptr, 0);
case 4:
#ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchangeAdd((volatile LONG*)ptr, 0);
#else
return _InterlockedExchangeAdd((volatile LONG*)ptr, 0);
#endif
case 8:
#ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
#else
return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, 0);
#endif
default:
return 0x0;
}
}
__inline int64_t enet_at_atomic_write(char* ptr, int64_t value, size_t size) {
switch (size) {
case 1:
return _InterlockedExchange8((volatile char*)ptr, (char)value);
case 2:
return _InterlockedExchange16((volatile SHORT*)ptr, (SHORT)value);
case 4:
#ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchange((volatile LONG*)ptr, (LONG)value);
#else
return _InterlockedExchange((volatile LONG*)ptr, (LONG)value);
#endif
case 8:
#ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
#else
return _InterlockedExchange64((volatile LONGLONG*)ptr, (LONGLONG)value);
#endif
default:
return 0x0;
}
}
__inline int64_t enet_at_atomic_cas(char* ptr, int64_t new_val, int64_t old_val, size_t size) {
switch (size) {
case 1:
return _InterlockedCompareExchange8((volatile char*)ptr, (char)new_val, (char)old_val);
case 2:
return _InterlockedCompareExchange16((volatile SHORT*)ptr, (SHORT)new_val, (SHORT)old_val);
case 4:
#ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
#else
return _InterlockedCompareExchange((volatile LONG*)ptr, (LONG)new_val, (LONG)old_val);
#endif
case 8:
#ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
#else
return _InterlockedCompareExchange64((volatile LONGLONG*)ptr, (LONGLONG)new_val, (LONGLONG)old_val);
#endif
default:
return 0x0;
}
}
__inline int64_t enet_at_atomic_inc(char* ptr, int64_t delta, size_t data_size) {
switch (data_size) {
case 1:
return _InterlockedExchangeAdd8((volatile char*)ptr, (char)delta);
case 2:
return _InterlockedExchangeAdd16((volatile SHORT*)ptr, (SHORT)delta);
case 4:
#ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
#else
return _InterlockedExchangeAdd((volatile LONG*)ptr, (LONG)delta);
#endif
case 8:
#ifdef ENET_NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
#else
return _InterlockedExchangeAdd64((volatile LONGLONG*)ptr, (LONGLONG)delta);
#endif
default:
return 0x0;
}
}
#define ENET_ATOMIC_READ(variable) enet_at_atomic_read((char*)(variable), ENET_ATOMIC_SIZEOF(variable))
#define ENET_ATOMIC_WRITE(variable, new_val) enet_at_atomic_write((char*)(variable), (int64_t)(new_val), ENET_ATOMIC_SIZEOF(variable))
#define ENET_ATOMIC_CAS(variable, old_value, new_val) enet_at_atomic_cas((char*)(variable), (int64_t)(new_val), (int64_t)(old_value), ENET_ATOMIC_SIZEOF(variable))
#define ENET_ATOMIC_INC(variable) enet_at_atomic_inc((char*)(variable), 1, ENET_ATOMIC_SIZEOF(variable))
#define ENET_ATOMIC_DEC(variable) enet_at_atomic_inc((char*)(variable), -1, ENET_ATOMIC_SIZEOF(variable))
#define ENET_ATOMIC_INC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), (delta), ENET_ATOMIC_SIZEOF(variable))
#define ENET_ATOMIC_DEC_BY(variable, delta) enet_at_atomic_inc((char*)(variable), -(delta), ENET_ATOMIC_SIZEOF(variable))
#elif defined(__GNUC__) || defined(__clang__)
#if defined(__clang__) || (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
#define AT_HAVE_ATOMICS
#endif
/* We want to use __atomic built-ins if possible because the __sync primitives are
deprecated, because the __atomic build-ins allow us to use ENET_ATOMIC_WRITE on
uninitialized memory without running into undefined behavior, and because the
__atomic versions generate more efficient code since we don't need to rely on
CAS when we don't actually want it.
Note that we use acquire-release memory order (like mutexes do). We could use
sequentially consistent memory order but that has lower performance and is
almost always unneeded. */
#ifdef AT_HAVE_ATOMICS
#define ENET_ATOMIC_READ(ptr) __atomic_load_n((ptr), __ATOMIC_ACQUIRE)
#define ENET_ATOMIC_WRITE(ptr, value) __atomic_store_n((ptr), (value), __ATOMIC_RELEASE)
#ifndef typeof
#define typeof __typeof__
#endif
/* clang_analyzer doesn't know that CAS writes to memory so it complains about
potentially lost data. Replace the code with the equivalent non-sync code. */
#ifdef __clang_analyzer__
#define ENET_ATOMIC_CAS(ptr, old_value, new_value)\
({\
typeof(*(ptr)) ENET_ATOMIC_CAS_old_actual_ = (*(ptr));\
if (ATOMIC_CAS_old_actual_ == (old_value))\
*(ptr) = new_value;\
ENET_ATOMIC_CAS_old_actual_;\
})
#else
/* Could use __auto_type instead of typeof but that shouldn't work in C++.
The ({ }) syntax is a GCC extension called statement expression. It lets
us return a value out of the macro.
TODO We should return bool here instead of the old value to avoid the ABA
problem. */
#define ENET_ATOMIC_CAS(ptr, old_value, new_value)\
({\
typeof(*(ptr)) ENET_ATOMIC_CAS_expected_ = (old_value);\
__atomic_compare_exchange_n((ptr), &ENET_ATOMIC_CAS_expected_, (new_value), false,\
__ATOMIC_ACQ_REL, __ATOMIC_ACQUIRE);\
ENET_ATOMIC_CAS_expected_;\
})
#endif
#define ENET_ATOMIC_INC(ptr) __atomic_fetch_add((ptr), 1, __ATOMIC_ACQ_REL)
#define ENET_ATOMIC_DEC(ptr) __atomic_fetch_sub((ptr), 1, __ATOMIC_ACQ_REL)
#define ENET_ATOMIC_INC_BY(ptr, delta) __atomic_fetch_add((ptr), (delta), __ATOMIC_ACQ_REL)
#define ENET_ATOMIC_DEC_BY(ptr, delta) __atomic_fetch_sub((ptr), (delta), __ATOMIC_ACQ_REL)
#else
#define ENET_ATOMIC_READ(variable) __sync_fetch_and_add(variable, 0)
#define ENET_ATOMIC_WRITE(variable, new_val) (void)__sync_val_compare_and_swap((variable), *(variable), (new_val))
#define ENET_ATOMIC_CAS(variable, old_value, new_val) __sync_val_compare_and_swap((variable), (old_value), (new_val))
#define ENET_ATOMIC_INC(variable) __sync_fetch_and_add((variable), 1)
#define ENET_ATOMIC_DEC(variable) __sync_fetch_and_sub((variable), 1)
#define ENET_ATOMIC_INC_BY(variable, delta) __sync_fetch_and_add((variable), (delta), 1)
#define ENET_ATOMIC_DEC_BY(variable, delta) __sync_fetch_and_sub((variable), (delta), 1)
#endif
#undef AT_HAVE_ATOMICS
#endif