/*-----------------------------------------------------------------------------

   File:        PlgMem.cpp

   Description: Implementation of memory management utilities

   Author:      Jasmin Frenette
   Date:        11/27/2000

-----------------------------------------------------------------------------*/

#include <windows.h>
#include "PlgMem.hpp"

void ChangeMemory(void* &pMem, long newSize)
{
   void*   pTemp;

   if(pMem == NULL){      // There was no previous memory allocated
      if(newSize!=0)   
         pMem = (void*) GlobalAlloc(GPTR,newSize); 
   }
   else{
      if(newSize!=0){   // Add or remove memory space
         pTemp = (void*) GlobalAlloc(GPTR,newSize);
         memcpy(pTemp, pMem, min(GlobalSize(pMem), (unsigned long)newSize));
         GlobalFree(pMem);
         pMem = pTemp;
      }
      else{             // Free the pointer
         GlobalFree(pMem);
         pMem = NULL;
      }
   }
}