source: code/branches/tutorial/src/network/Synchronisable.cc @ 1678

//
// C++ Implementation: synchronisable
//
// Description:
//
//
// Author:  Dumeni, Oliver Scheuss, (C) 2007
//
// Copyright: See COPYING file that comes with this distribution
//

#include <string>
#include <iostream>

#include "Synchronisable.h"

namespace network
{
  /**
  * Constructor:
  * calls registarAllVariables, that has to be implemented by the inheriting classID
  */
  Synchronisable::Synchronisable(){
    RegisterRootObject(Synchronisable);
    static int idCounter=0;
    datasize=0;
    objectID=idCounter++;
    //registerAllVariables();
  }

  Synchronisable::~Synchronisable(){
  }

  /**
  * This function is used to register a variable to be synchronized
  * also counts the total datasize needed to save the variables
  * @param var pointer to the variable
  * @param size size of the datatype the variable consists of
  */
  void Synchronisable::registerVar(const void *var, int size, variableType t){
    // create temporary synch.Var struct
    synchronisableVariable temp={size, var, t};
    // increase datasize
    datasize+=sizeof(int)+size;
    // push temp to syncList (at the bottom)
    syncList.push_back(temp);
  }

  /**
  * note: only use this function for debug use, because it's inefficient (in order to produce a gamestate, you have to copy the whole data again to another memory location after this process)
  * This function takes all SynchronisableVariables out of the Synchronisable and saves it into a syncData struct
  * structure of the bitstream:
  * (var1_size,var1,var2_size,var2,...)
  * varx_size: size = sizeof(int)
  * varx: size = varx_size
  * @return data containing all variables and their sizes
  */
  // syncData Synchronisable::getData(){
  //   std::list<synchronisableVariable>::iterator i;
  //   int totalsize=0;
  //   //figure out size of data to be allocated
  //   for(i=syncList.begin(); i!=syncList.end(); i++){
  //     // increase size (size of variable and size of size of variable ;)
  //     if(i->type == STRING)
  //       totalsize+=sizeof(int)+((std::string *)i->var)->length()+1;
  //     else
  //       totalsize+=sizeof(int)+i->size;
  //   }
  //   syncData retVal;
  //   retVal.objectID=this->objectID;
  //   retVal.classID=this->classID;
  //   retVal.length=totalsize;
  //   // allocate memory
  //   retVal.data = (unsigned char *)malloc(totalsize);
  //   // copy to location
  //   //CHANGED: REMOVED DECLARATION int n=0 FROM LOOP
  //   int n=0;
  //   for(i=syncList.begin(); n<totalsize && i!=syncList.end(); i++){
  //     std::memcpy(retVal.data+n, (const void*)(i->size), sizeof(int));
  //     n+=sizeof(int);
  //     switch(i->type){
  //     case STRING:
  //       std::memcpy(retVal.data+n, (const void *)(((std::string *)i->var)->c_str()), ((std::string *)i->var)->length()+1);
  //       n+=((std::string *)i->var)->length()+1;
  //       break;
  //     case DATA:
  //       std::memcpy(retVal.data+n, ((const void*)i->var), i->size);
  //       n+=i->size;
  //       break;
  //     }
  //   }
  //   return retVal;
  // }
  /**
  * This function takes all SynchronisableVariables out of the Synchronisable and saves it into a syncData struct
  * Difference to the above function:
  * takes a pointer to already allocated memory (must have at least getSize bytes length)
  * structure of the bitstream:
  * (var1_size,var1,var2_size,var2,...)
  * varx_size: size = sizeof(int)
  * varx: size = varx_size
  * @return data containing all variables and their sizes
  */
  syncData Synchronisable::getData(unsigned char *mem){
    std::list<synchronisableVariable>::iterator i;
    syncData retVal;
    retVal.objectID=this->objectID;
    retVal.classID=this->classID;
    retVal.length=getSize();
    retVal.data=mem;
    // copy to location
    int n=0;
    for(i=syncList.begin(); n<datasize && i!=syncList.end(); ++i){
      //COUT(2) << "size of variable: " << i->size << std::endl;
      //(std::memcpy(retVal.data+n, (const void*)(&(i->size)), sizeof(int));
      memcpy( (void *)(retVal.data+n), (const void*)&(i->size), sizeof(int) );
      n+=sizeof(int);
      switch(i->type){
      case DATA:
        std::memcpy( (void *)(retVal.data+n), (const void*)(i->var), i->size);
        n+=i->size;
        break;
      case STRING:
        std::memcpy( retVal.data+n, (const void*)( ( (std::string *) i->var)->c_str()), ( (std::string *)i->var )->length()+1);
        n+=((std::string *) i->var)->length()+1;
        break;
      }
    }
    return retVal;
  }

  /**
  * This function takes a syncData struct and takes it to update the variables
  * @param vars data of the variables
  * @return true/false
  */
  bool Synchronisable::updateData(syncData vars){
    unsigned char *data=vars.data;
    std::list<synchronisableVariable>::iterator i;
    for(i=syncList.begin(); i!=syncList.end(); i++){
      if((int)*data==i->size || i->type==STRING){
        switch(i->type){
      case DATA:
        data+=sizeof(int);
        memcpy((void*)i->var, data, i->size);
        data+=i->size;
        break;
      case STRING:
        i->size = (int)*data;
        data+=sizeof(int);
        *((std::string *)i->var) = std::string((const char*)data);
        data += i->size;
        break;
        }
      } else
        return false; //there was some problem with registerVar
    }
    return true;
  }

  /**
  * This function returns the total amount of bytes needed by getData to save the whole content of the variables
  * @return amount of bytes
  */
  int Synchronisable::getSize(){
    int tsize=0;
    std::list<synchronisableVariable>::iterator i;
    for(i=syncList.begin(); i!=syncList.end(); i++){
      switch(i->type){
    case DATA:
      tsize+=sizeof(int);
      tsize+=i->size;
      break;
    case STRING:
      tsize+=sizeof(int);
      tsize+=((std::string *)i->var)->length()+1;
      break;
      }
    }
    return tsize;
  }

}