Changeset 313 for code/branches/network

Timestamp:

Nov 28, 2007, 2:39:12 PM (17 years ago)

Author:

dumenim

Message:

correct gamestate, comment

Location:

code/branches/network/src/network

Files:

• PacketDecoder.cc (modified) (8 diffs)
• PacketGenerator.cc (modified) (2 diffs)
• PacketManager.h (modified) (2 diffs)

code/branches/network/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:
@@ -53 +53 @@
 {
         ack* a = new ack;
-        *a = *(ack*)packet->data;
-        printAck( a );
+        *a = *(ack*)packet->data; //press pattern of ack on new data
+        printAck( a ); //debug info
 }
 
@@ -60 +60 @@
 {
         mouse* mouseMove = new mouse;
-        *mouseMove = *(mouse*)packet->data;
-        printMouse( mouseMove );
+        //copy data of packet->data to new struct
+        *mouseMove = *(mouse*)packet->data; 
+        printMouse( mouseMove ); //debug info
 }
 
@@ -67 +68 @@
 {
         keyboard* key = new keyboard;
-        *key = *(keyboard*)packet->data;
-        printKey( key );
+        *key = *(keyboard*)packet->data; //see above
+        printKey( key ); //debug info
 }
 
@@ -74 +75 @@
 {
         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 );
+        printChat( chatting ); //debug info
 }
 
@@ -84 +89 @@
 {
         GameState* currentState = new GameState;
+        //since it's not alowed to use void* for pointer arithmetic
         unsigned char* data = (unsigned char*)packet->data;
-        memcpy( (void*)&(currentState->size), (const void*)(data+sizeof( int )), sizeof(int) );
-        memcpy( (void*)(currentState->data), (const void*)(data+2*sizeof( int )), currentState->size );
+        //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 );
 }
 
@@ -117 +130 @@
 void PacketDecoder::printGamestate( GameState* data )
 {
+        cout << "id of gamestate:   " << data->id << endl;
         cout << "size of gamestate: " << data->size << endl;
 }

code/branches/network/src/network/PacketGenerator.cc

@@ -1 +1 @@
 /*
  *Class generates packets that can be send by enet
+ * ->don't read this without the class PacketDecoder, since they belong together
  * 
  * Autor: Dumeni Manatschal
@@ -71 +72 @@
 ENetPacket* PacketGenerator::gstate( GameState* states, int reliable )
 {
-        int* gid; *gid = GAMESTATE;
-        int totalLen = sizeof( int ) + states->size;
-        unsigned char* data = (unsigned char*)malloc( totalLen );
-        memcpy( (void*)(data), (const void*)gid, sizeof( int ) );
-        memcpy( (void*)(data+sizeof( int )), (const void*)states->data, states->size );
+        int* gid; *gid = GAMESTATE; //first assign the correct enet id
+        int totalLen = 3*sizeof( int ) + states->size; //calculate the total size of the datastream memory
+        unsigned char* data = (unsigned char*)malloc( totalLen ); //allocate the memory for datastream
+        memcpy( (void*)(data), (const void*)gid, sizeof( int ) ); //this is the enet id
+        memcpy( (void*)(data+sizeof(int)), (const void*)&(states->id), sizeof(int) ); //the gamestate id
+        //this is the size of the gamestate data, place at 3th position of the enet datastream
+        memcpy( (void*)(data+2*sizeof(int)), (const void*)&(states->size), sizeof(int)); 
+        //place the gamestate data at the end of the enet datastream
+        memcpy( (void*)(data+3*sizeof( int )), (const void*)states->data, states->size );
+        //create an enet packet with the generated bytestream
         ENetPacket *packet = enet_packet_create( data , totalLen, reliable );
         

code/branches/network/src/network/PacketManager.h

@@ -19 +19 @@
  * class to generate packets
  * 
- * Autor: Dumeni Manatschal
+ * @autor: Dumeni Manatschal
  * 
 */ 
@@ -54 +54 @@
  * class used to decode incoming packets
  * 
- * Autor: Dumeni Manatschal
+ * @autor: Dumeni Manatschal
  * 
 */