1 /* $Id$ */

     2 

     3 #ifdef ENABLE_NETWORK

     4 

     5 #include "../stdafx.h"

     6 #include "../debug.h"

     7 #include "network_data.h"

     8 #include "../string.h"

     9 #include "network_client.h"

    10 #include "../command.h"

    11 #include "../callback_table.h"

    12 

    13 // Add a command to the local command queue

    14 void NetworkAddCommandQueue(NetworkClientState *cs, CommandPacket *cp)

    15 {

    16 	CommandPacket* new_cp = malloc(sizeof(*new_cp));

    17 

    18 	*new_cp = *cp;

    19 

    20 	if (cs->command_queue == NULL) {

    21 		cs->command_queue = new_cp;

    22 	} else {

    23 		CommandPacket *c = cs->command_queue;

    24 		while (c->next != NULL) c = c->next;

    25 		c->next = new_cp;

    26 	}

    27 }

    28 

    29 // Prepare a DoCommand to be send over the network

    30 void NetworkSend_Command(TileIndex tile, uint32 p1, uint32 p2, uint32 cmd, CommandCallback *callback)

    31 {

    32 	CommandPacket *c = malloc(sizeof(CommandPacket));

    33 	byte temp_callback;

    34 

    35 	c->player = _local_player;

    36 	c->next = NULL;

    37 	c->tile = tile;

    38 	c->p1 = p1;

    39 	c->p2 = p2;

    40 	c->cmd = cmd;

    41 	c->callback = 0;

    42 

    43 	temp_callback = 0;

    44 

    45 	while (temp_callback < _callback_table_count && _callback_table[temp_callback] != callback)

    46 		temp_callback++;

    47 	if (temp_callback == _callback_table_count) {

    48 		DEBUG(net, 0, "Unknown callback. (Pointer: %p) No callback sent", callback);

    49 		temp_callback = 0; /* _callback_table[0] == NULL */

    50 	}

    51 

    52 	if (_network_server) {

    53 		// We are the server, so set the command to be executed next possible frame

    54 		c->frame = _frame_counter_max + 1;

    55 	} else {

    56 		c->frame = 0; // The client can't tell which frame, so just make it 0

    57 	}

    58 

    59 	ttd_strlcpy(c->text, (_cmd_text != NULL) ? _cmd_text : "", lengthof(c->text));

    60 

    61 	if (_network_server) {

    62 		// If we are the server, we queue the command in our 'special' queue.

    63 		//   In theory, we could execute the command right away, but then the

    64 		//   client on the server can do everything 1 tick faster than others.

    65 		//   So to keep the game fair, we delay the command with 1 tick

    66 		//   which gives about the same speed as most clients.

    67 		NetworkClientState *cs;

    68 

    69 		// And we queue it for delivery to the clients

    70 		FOR_ALL_CLIENTS(cs) {

    71 			if (cs->status > STATUS_AUTH) NetworkAddCommandQueue(cs, c);

    72 		}

    73 

    74 		// Only the server gets the callback, because clients should not get them

    75 		c->callback = temp_callback;

    76 		if (_local_command_queue == NULL) {

    77 			_local_command_queue = c;

    78 		} else {

    79 			// Find last packet

    80 			CommandPacket *cp = _local_command_queue;

    81 			while (cp->next != NULL) cp = cp->next;

    82 			cp->next = c;

    83 		}

    84 

    85 		return;

    86 	}

    87 

    88 	// Clients send their command to the server and forget all about the packet

    89 	c->callback = temp_callback;

    90 	SEND_COMMAND(PACKET_CLIENT_COMMAND)(c);

    91 }

    92 

    93 // Execute a DoCommand we received from the network

    94 void NetworkExecuteCommand(CommandPacket *cp)

    95 {

    96 	_current_player = cp->player;

    97 	_cmd_text = cp->text;

    98 	/* cp->callback is unsigned. so we don't need to do lower bounds checking. */

    99 	if (cp->callback > _callback_table_count) {

   100 		DEBUG(net, 0, "Received out-of-bounds callback (%d)", cp->callback);

   101 		cp->callback = 0;

   102 	}

   103 	DoCommandP(cp->tile, cp->p1, cp->p2, _callback_table[cp->callback], cp->cmd | CMD_NETWORK_COMMAND);

   104 }

   105 

   106 #endif /* ENABLE_NETWORK */