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enet.cpp
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#define ENET_IMPLEMENTATION
#include "./include/enet/enet.h"
#ifdef __cplusplus
extern "C"
{
#endif
// =======================================================================//
// !
// ! Atomics
// !
// =======================================================================//
#if defined(_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 NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchangeAdd((volatile LONG *)ptr, 0);
#else
return _InterlockedExchangeAdd((volatile LONG *)ptr, 0);
#endif
case 8:
#ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchangeAdd64((volatile LONGLONG *)ptr, 0);
#else
return _InterlockedExchangeAdd64((volatile LONGLONG *)ptr, 0);
#endif
default:
return 0xbad13bad; /* never reached */
}
}
__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 NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchange((volatile LONG *)ptr, (LONG)value);
#else
return _InterlockedExchange((volatile LONG *)ptr, (LONG)value);
#endif
case 8:
#ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchange64((volatile LONGLONG *)ptr, (LONGLONG)value);
#else
return _InterlockedExchange64((volatile LONGLONG *)ptr, (LONGLONG)value);
#endif
default:
return 0xbad13bad; /* never reached */
}
}
__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 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 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 0xbad13bad; /* never reached */
}
}
__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 NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchangeAdd((volatile LONG *)ptr, (LONG)delta);
#else
return _InterlockedExchangeAdd((volatile LONG *)ptr, (LONG)delta);
#endif
case 8:
#ifdef NOT_UNDERSCORED_INTERLOCKED_EXCHANGE
return InterlockedExchangeAdd64((volatile LONGLONG *)ptr, (LONGLONG)delta);
#else
return _InterlockedExchangeAdd64((volatile LONGLONG *)ptr, (LONGLONG)delta);
#endif
default:
return 0xbad13bad; /* never reached */
}
}
#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 /* __clang_analyzer__ */
#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 /* AT_HAVE_ATOMICS */
#undef AT_HAVE_ATOMICS
#endif /* defined(_MSC_VER) */
// =======================================================================//
// !
// ! Callbacks
// !
// =======================================================================//
static ENetCallbacks callbacks = {malloc, free, abort, enet_packet_create, enet_packet_destroy};
int enet_initialize_with_callbacks(ENetVersion version, const ENetCallbacks *inits)
{
if (version < ENET_VERSION_CREATE(1, 3, 0))
{
return -1;
}
if (inits->malloc != NULL || inits->free != NULL)
{
if (inits->malloc == NULL || inits->free == NULL)
{
return -1;
}
callbacks.malloc = inits->malloc;
callbacks.free = inits->free;
}
if (inits->no_memory != NULL)
{
callbacks.no_memory = inits->no_memory;
}
if (inits->packet_create != NULL || inits->packet_destroy != NULL)
{
if (inits->packet_create == NULL || inits->packet_destroy == NULL)
{
return -1;
}
callbacks.packet_create = inits->packet_create;
callbacks.packet_destroy = inits->packet_destroy;
}
return enet_initialize();
}
ENetVersion enet_linked_version(void)
{
return ENET_VERSION;
}
void *enet_malloc(size_t size)
{
void *memory = callbacks.malloc(size);
if (memory == NULL)
{
callbacks.no_memory();
}
return memory;
}
void enet_free(void *memory)
{
callbacks.free(memory);
}
// =======================================================================//
// !
// ! List
// !
// =======================================================================//
void enet_list_clear(ENetList *list)
{
list->sentinel.next = &list->sentinel;
list->sentinel.previous = &list->sentinel;
}
ENetListIterator enet_list_insert(ENetListIterator position, void *data)
{
ENetListIterator result = (ENetListIterator)data;
result->previous = position->previous;
result->next = position;
result->previous->next = result;
position->previous = result;
return result;
}
void *enet_list_remove(ENetListIterator position)
{
position->previous->next = position->next;
position->next->previous = position->previous;
return position;
}
ENetListIterator enet_list_move(ENetListIterator position, void *dataFirst, void *dataLast)
{
ENetListIterator first = (ENetListIterator)dataFirst;
ENetListIterator last = (ENetListIterator)dataLast;
first->previous->next = last->next;
last->next->previous = first->previous;
first->previous = position->previous;
last->next = position;
first->previous->next = first;
position->previous = last;
return first;
}
size_t enet_list_size(ENetList *list)
{
size_t size = 0;
ENetListIterator position;
for (position = enet_list_begin(list); position != enet_list_end(list); position = enet_list_next(position))
{
++size;
}
return size;
}
// =======================================================================//
// !
// ! Packet
// !
// =======================================================================//
/**
* Creates a packet that may be sent to a peer.
* @param data initial contents of the packet's data; the packet's data will remain uninitialized if data is NULL.
* @param dataLength size of the data allocated for this packet
* @param flags flags for this packet as described for the ENetPacket structure.
* @returns the packet on success, NULL on failure
*/
ENetPacket *enet_packet_create(const void *data, size_t dataLength, enet_uint32 flags)
{
ENetPacket *packet;
if (flags & ENET_PACKET_FLAG_NO_ALLOCATE)
{
packet = (ENetPacket *)enet_malloc(sizeof(ENetPacket));
if (packet == NULL)
{
return NULL;
}
packet->data = (enet_uint8 *)data;
}
else
{
packet = (ENetPacket *)enet_malloc(sizeof(ENetPacket) + dataLength);
if (packet == NULL)
{
return NULL;
}
packet->data = (enet_uint8 *)packet + sizeof(ENetPacket);
if (data != NULL)
{
memcpy(packet->data, data, dataLength);
}
}
packet->referenceCount = 0;
packet->flags = flags;
packet->dataLength = dataLength;
packet->freeCallback = NULL;
packet->userData = NULL;
return packet;
}
ENetPacket *enet_packet_create_offset(const void *data, size_t dataLength, size_t dataOffset, enet_uint32 flags)
{
ENetPacket *packet;
if (flags & ENET_PACKET_FLAG_NO_ALLOCATE)
{
packet = (ENetPacket *)enet_malloc(sizeof(ENetPacket));
if (packet == NULL)
{
return NULL;
}
packet->data = (enet_uint8 *)data;
}
else
{
packet = (ENetPacket *)enet_malloc(sizeof(ENetPacket) + dataLength + dataOffset);
if (packet == NULL)
{
return NULL;
}
packet->data = (enet_uint8 *)packet + sizeof(ENetPacket);
if (data != NULL)
{
memcpy(packet->data + dataOffset, data, dataLength);
}
}
packet->referenceCount = 0;
packet->flags = flags;
packet->dataLength = dataLength + dataOffset;
packet->freeCallback = NULL;
packet->userData = NULL;
return packet;
}
ENetPacket *enet_packet_copy(ENetPacket *packet)
{
return enet_packet_create(packet->data, packet->dataLength, packet->flags);
}
/**
* Destroys the packet and deallocates its data.
* @param packet packet to be destroyed
*/
void enet_packet_destroy(ENetPacket *packet)
{
if (packet == NULL)
{
return;
}
if (packet->freeCallback != NULL)
{
(*packet->freeCallback)((void *)packet);
}
enet_free(packet);
}
int initializedCRC32 = 0;
enet_uint32 crcTable[256];
enet_uint32 reflect_crc(int val, int bits)
{
int result = 0, bit;
for (bit = 0; bit < bits; bit++)
{
if (val & 1)
{
result |= 1 << (bits - 1 - bit);
}
val >>= 1;
}
return result;
}
void initialize_crc32(void)
{
int byte;
for (byte = 0; byte < 256; ++byte)
{
enet_uint32 crc = reflect_crc(byte, 8) << 24;
int offset;
for (offset = 0; offset < 8; ++offset)
{
if (crc & 0x80000000)
{
crc = (crc << 1) ^ 0x04c11db7;
}
else
{
crc <<= 1;
}
}
crcTable[byte] = reflect_crc(crc, 32);
}
initializedCRC32 = 1;
}
enet_uint32 enet_crc32(const ENetBuffer *buffers, size_t bufferCount)
{
enet_uint32 crc = 0xFFFFFFFF;
if (!initializedCRC32)
{
initialize_crc32();
}
while (bufferCount-- > 0)
{
const enet_uint8 *data = (const enet_uint8 *)buffers->data;
const enet_uint8 *dataEnd = &data[buffers->dataLength];
while (data < dataEnd)
{
crc = (crc >> 8) ^ crcTable[(crc & 0xFF) ^ *data++];
}
++buffers;
}
return ENET_HOST_TO_NET_32(~crc);
}
// =======================================================================//
// !
// ! Protocol
// !
// =======================================================================//
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];
}
void enet_protocol_change_state(ENetHost *host, ENetPeer *peer, ENetPeerState state)
{
ENET_UNUSED(host)
if (state == ENET_PEER_STATE_CONNECTED || state == ENET_PEER_STATE_DISCONNECT_LATER)
{
enet_peer_on_connect(peer);
}
else
{
enet_peer_on_disconnect(peer);
}
peer->state = state;
}
void enet_protocol_dispatch_state(ENetHost *host, ENetPeer *peer, ENetPeerState state)
{
enet_protocol_change_state(host, peer, state);
if (!peer->needsDispatch)
{
enet_list_insert(enet_list_end(&host->dispatchQueue), &peer->dispatchList);
peer->needsDispatch = 1;
}
}
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:
enet_protocol_change_state(host, peer, 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;
default:
break;
}
}
return 0;
} /* enet_protocol_dispatch_incoming_commands */
static void enet_protocol_notify_connect(ENetHost *host, ENetPeer *peer, ENetEvent *event)
{
host->recalculateBandwidthLimits = 1;
if (event != NULL)
{
enet_protocol_change_state(host, peer, ENET_PEER_STATE_CONNECTED);
peer->totalDataSent = 0;
peer->totalDataReceived = 0;
peer->totalPacketsSent = 0;
peer->totalPacketsLost = 0;
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);
}
}
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);
}
}
void enet_protocol_notify_disconnect_timeout(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_TIMEOUT;
event->peer = peer;
event->data = 0;
enet_peer_reset(peer);
}
else
{
peer->eventData = 0;
enet_protocol_dispatch_state(host, peer, ENET_PEER_STATE_ZOMBIE);
}
}
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)
{
outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
callbacks.packet_destroy(outgoingCommand->packet);
}
}
enet_free(outgoingCommand);
}
}
ENetProtocolCommand enet_protocol_remove_sent_reliable_command(ENetPeer *peer, enet_uint16 reliableSequenceNumber, enet_uint8 channelID)
{
ENetOutgoingCommand *outgoingCommand = NULL;
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 (outgoingCommand == NULL)
{
return ENET_PROTOCOL_COMMAND_NONE;
}
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)
{
outgoingCommand->packet->flags |= ENET_PACKET_FLAG_SENT;
callbacks.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;
} /* enet_protocol_remove_sent_reliable_command */
ENetPeer *enet_protocol_handle_connect(ENetHost *host, ENetProtocolHeader *header, ENetProtocol *command)
{
ENET_UNUSED(header)
enet_uint8 incomingSessionID, outgoingSessionID;
enet_uint32 mtu, windowSize;
ENetChannel *channel;
size_t channelCount, duplicatePeers = 0;
ENetPeer *currentPeer, *peer = NULL;
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)
{
if (peer == NULL)
{
peer = currentPeer;
}
}
else if (currentPeer->state != ENET_PEER_STATE_CONNECTING && in6_equal(currentPeer->address.host, host->receivedAddress.host))
{
if (currentPeer->address.port == host->receivedAddress.port && currentPeer->connectID == command->connect.connectID)
{
return NULL;
}
++duplicatePeers;
}
}
if (peer == NULL || duplicatePeers >= host->duplicatePeers)
{
return NULL;
}
if (channelCount > host->channelLimit)
{
channelCount = host->channelLimit;
}
peer->channels = (ENetChannel *)enet_malloc(channelCount * sizeof(ENetChannel));
if (peer->channels == NULL)
{
return NULL;
}
peer->channelCount = channelCount;
peer->state = ENET_PEER_STATE_ACKNOWLEDGING_CONNECT;
peer->connectID = command->connect.connectID;
peer->address = host->receivedAddress;
peer->outgoingPeerID = ENET_NET_TO_HOST_16(command->connect.outgoingPeerID);
peer->incomingBandwidth = ENET_NET_TO_HOST_32(command->connect.incomingBandwidth);
peer->outgoingBandwidth = ENET_NET_TO_HOST_32(command->connect.outgoingBandwidth);
peer->packetThrottleInterval = ENET_NET_TO_HOST_32(command->connect.packetThrottleInterval);
peer->packetThrottleAcceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleAcceleration);
peer->packetThrottleDeceleration = ENET_NET_TO_HOST_32(command->connect.packetThrottleDeceleration);
peer->eventData = ENET_NET_TO_HOST_32(command->connect.data);
incomingSessionID = command->connect.incomingSessionID == 0xFF ? peer->outgoingSessionID : command->connect.incomingSessionID;
incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
if (incomingSessionID == peer->outgoingSessionID)
{
incomingSessionID = (incomingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
}
peer->outgoingSessionID = incomingSessionID;
outgoingSessionID = command->connect.outgoingSessionID == 0xFF ? peer->incomingSessionID : command->connect.outgoingSessionID;
outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
if (outgoingSessionID == peer->incomingSessionID)
{
outgoingSessionID = (outgoingSessionID + 1) & (ENET_PROTOCOL_HEADER_SESSION_MASK >> ENET_PROTOCOL_HEADER_SESSION_SHIFT);
}
peer->incomingSessionID = outgoingSessionID;
for (channel = peer->channels; channel < &peer->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;
}
peer->mtu = mtu;
if (host->outgoingBandwidth == 0 && peer->incomingBandwidth == 0)
{
peer->windowSize = ENET_PROTOCOL_MAXIMUM_WINDOW_SIZE;
}
else if (host->outgoingBandwidth == 0 || peer->incomingBandwidth == 0)
{
peer->windowSize = (ENET_MAX(host->outgoingBandwidth, peer->incomingBandwidth) / ENET_PEER_WINDOW_SIZE_SCALE) * ENET_PROTOCOL_MINIMUM_WINDOW_SIZE;
}
else
{
peer->windowSize = (ENET_MIN(host->outgoingBandwidth, peer->incomingBandwidth) / 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;
}
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(peer->incomingPeerID);
verifyCommand.verifyConnect.incomingSessionID = incomingSessionID;
verifyCommand.verifyConnect.outgoingSessionID = outgoingSessionID;
verifyCommand.verifyConnect.mtu = ENET_HOST_TO_NET_32(peer->mtu);
verifyCommand.verifyConnect.windowSize = ENET_HOST_TO_NET_32(windowSize);
verifyCommand.verifyConnect.channelCount = ENET_HOST_TO_NET_32(channelCount);
verifyCommand.verifyConnect.incomingBandwidth = ENET_HOST_TO_NET_32(host->incomingBandwidth);
verifyCommand.verifyConnect.outgoingBandwidth = ENET_HOST_TO_NET_32(host->outgoingBandwidth);
verifyCommand.verifyConnect.packetThrottleInterval = ENET_HOST_TO_NET_32(peer->packetThrottleInterval);