list.cpp

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//
// CDPA - Shell like DPA stuff
//
// FelixA
//

#include "pch.h"
#include "list.h"

//
//
CDPA::CDPA()
: m_iAllocated(0),
  m_iCurrentTop(0),
  m_pData(NULL),
  m_Heap(NULL)  //Allocate from global heap.
{
}

CDPA::~CDPA()
{
        LPVOID lpV;
        int i=0;
        while( lpV=GetPointer(i++) )
                delete lpV;

        //
        // BugBug - you must delete all the data that we allocated in the list
        //
        if(GetData())
                HeapFree(GetHeap(), 0, GetData());
}

//
// Inserts at the end - no mechanism for inserting in the middle.
// Grows the Heap if you add more items than currently have spave for
//
BOOL CDPA::Append(LPVOID lpData)
{
        if(GetNextFree()==GetAllocated())
        {
                int iNewSize = GetAllocated()+32;       // Grow in 32 allocations;
        void FAR * FAR * ppNew;

                if(GetData())
            ppNew = (void FAR * FAR *)HeapReAlloc(GetHeap(), HEAP_ZERO_MEMORY, GetData(), iNewSize * sizeof(LPVOID));
                else
                {
                        if(!GetHeap())
                                SetHeap(HeapCreate(0,0x4000,0));
            ppNew = (void FAR * FAR *)HeapAlloc(GetHeap(), HEAP_ZERO_MEMORY, iNewSize * sizeof(LPVOID));
                }

                SetData(ppNew);
                if(ppNew)
                {
                        SetAllocated(iNewSize);
                }
                else
                        return FALSE;
        }

        *(GetData()+GetNextFree())=lpData;
        SetNextFree(GetNextFree()+1);
        return TRUE;
}

//
// Given the index into the list, returns its value.
//
LPVOID CDPA::GetPointer(int iItem) const
{
        if(GetData())
                if(iItem<GetAllocated())        // mCurrentTop is not active.
                        return *(GetData()+iItem);
        return NULL;
}

int CDPA::GetCount()
{
        return GetNextFree();
}

void CDPA::Remove(int iItem) 
{
        if(GetData())
                if(iItem<GetAllocated())        // mCurrentTop is not active.
                        *(GetData()+iItem)=NULL;
}

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