Changeset 332 for code/branches/merger/src/network/PacketDecoder.cc

Timestamp:

Nov 28, 2007, 5:20:23 PM (16 years ago)

Author:

nicolasc

Message:

merge network

File:

• code/branches/merger/src/network/PacketDecoder.cc (modified) (8 diffs)

code/branches/merger/src/network/PacketDecoder.cc

@@ -1 +1 @@
 /*
  * Class contains functions to determine and decode incomming packages
+ * ->don't read this without the class PacketGenerator, since they belong together
  * 
  * Autor: Dumeni Manatschal
  * 
 */
-
 
 #include "enet/enet.h"
@@ -21 +21 @@
 {
         int client = clientId;
-        cout << "clientId: " << client << endl;
-        int id = (int)*packet->data;
+        cout << "clientId: " << client << endl; //control cout, not important, just debugging info
+        int id = (int)*packet->data; //the first 4 bytes are always the enet packet id
         switch( id ) {
         case ACK:
@@ -40 +40 @@
                 return true;
                 break;
+        case GAMESTATE:
+                gstate( packet );
+                return true;
+                break;
         }
         return false;
@@ -49 +53 @@
 {
         ack* a = new ack;
-        *a = *(ack*)packet->data;
-        printAck( a );
+        *a = *(ack*)packet->data; //press pattern of ack on new data
+        
+        //clean memory
+        enet_packet_destroy( packet );
+        
+        printAck( a ); //debug info
 }
 
@@ -56 +64 @@
 {
         mouse* mouseMove = new mouse;
-        *mouseMove = *(mouse*)packet->data;
-        printMouse( mouseMove );
+        //copy data of packet->data to new struct
+        *mouseMove = *(mouse*)packet->data; 
+        
+        //clean memory
+        enet_packet_destroy( packet );
+        
+        printMouse( mouseMove ); //debug info
 }
 
@@ -63 +76 @@
 {
         keyboard* key = new keyboard;
-        *key = *(keyboard*)packet->data;
-        printKey( key );
+        *key = *(keyboard*)packet->data; //see above
+        
+        //clean memory
+        enet_packet_destroy( packet );
+        
+        printKey( key ); //debug info
+
 }
 
@@ -70 +88 @@
 {
         chat* chatting = new chat;
-        chatting->id = (int)*packet->data;
-        char* reserve = new char[packet->dataLength-4];
-        memcpy( &reserve[0], packet->data+sizeof(int), packet->dataLength-4 );
+        chatting->id = (int)*packet->data; //first copy id into new struct
+        //since the chat message is a char*, allocate the memory needed
+        char* reserve = new char[packet->dataLength-4]; 
+        //copy the transmitted bytestream into the new generated char*,
+        //note the lenght of the message is represented as "packet->dataLength-sizeof( int )" 
+        memcpy( &reserve[0], packet->data+sizeof(int), packet->dataLength-sizeof(int) );
+        //put pointer of chatting struct to the begining of the new generated char*
         chatting->message = reserve;
-        printChat( chatting );
+        
+        //clean memory
+        enet_packet_destroy( packet );
+        
+        printChat( chatting ); //debug info
+        
+}
+
+void PacketDecoder::gstate( ENetPacket* packet )
+{
+        GameState* currentState = new GameState;
+        //since it's not alowed to use void* for pointer arithmetic
+        unsigned char* data = (unsigned char*)packet->data;
+        //copy the gamestate id into the struct, which is located at second place data+sizeof( int )
+        memcpy( (void*)&(currentState->id), (const void*)(data+sizeof( int )), sizeof( int ) );
+        //copy the size of the gamestate data into the new gamestate struct, located at 3th
+        //position of the data stream, data+2*sizeof( int )
+        memcpy( (void*)&(currentState->size), (const void*)(data+2*sizeof( int )), sizeof( int) );
+        //since data is not allocated, because it's just a pointer, allocate it with size of gamestatedatastream
+        currentState->data = (unsigned char*)(malloc( currentState->size ));
+        //copy the gamestate data
+        memcpy( (void*)(currentState->data), (const void*)(data+3*sizeof( int )), currentState->size );
+        
+        //clean memory
+        enet_packet_destroy( packet );
 }
 
@@ -100 +146 @@
 {
         cout << "data id: " << data->id << endl;
-        cout << "blablabla" << endl;
         cout << "data:    " << data->message << endl;
 }
+
+void PacketDecoder::printGamestate( GameState* data )
+{
+        cout << "id of gamestate:   " << data->id << endl;
+        cout << "size of gamestate: " << data->size << endl;
+}