
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1997 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.

/////////////////////////////////////////////////////////////////////////////
//
// Implementation of parameterized Array
//
/////////////////////////////////////////////////////////////////////////////
// NOTE: we allocate an array of 'm_nMaxSize' elements, but only
//  the current size 'm_nSize' contains properly constructed
//  objects.

//#include "stdafx.h"
#include <assert.h>
#include <string.h>
#include <memory.h>
#include "CollectionClasses.h"


/////////////////////////////////////////////////////////////////////////////

IPtrArray::IPtrArray()
{
	m_pData = NULL;
	m_nSize = m_nMaxSize = m_nGrowBy = 0;
}

IPtrArray::~IPtrArray()
{
	ASSERT_VALID(this);

	delete[] (byte*)m_pData;
}

void IPtrArray::SetSize(int nNewSize, int nGrowBy)
{
	ASSERT_VALID(this);
	ASSERT(nNewSize >= 0);

	if (nGrowBy != -1)
		m_nGrowBy = nGrowBy;  // set new size

	if (nNewSize == 0)
	{
		// shrink to nothing
		delete[] (byte*)m_pData;
		m_pData = NULL;
		m_nSize = m_nMaxSize = 0;
	}
	else if (m_pData == NULL)
	{
		// create one with exact size
#ifdef SIZE_T_MAX
		ASSERT(nNewSize <= SIZE_T_MAX/sizeof(void*));    // no overflow
#endif
		m_pData = (void**) new byte[nNewSize * sizeof(void*)];

		memset(m_pData, 0, nNewSize * sizeof(void*));  // zero fill

		m_nSize = m_nMaxSize = nNewSize;
	}
	else if (nNewSize <= m_nMaxSize)
	{
		// it fits
		if (nNewSize > m_nSize)
		{
			// initialize the new elements
			memset(&m_pData[m_nSize], 0, (nNewSize-m_nSize) * sizeof(void*));
		}

		m_nSize = nNewSize;
	}
	else
	{
		// otherwise, grow array
		int nGrowBy = m_nGrowBy;
		if (nGrowBy == 0)
		{
			// heuristically determine growth when nGrowBy == 0
			//  (this avoids heap fragmentation in many situations)
			nGrowBy = min(1024, max(4, m_nSize / 8));
		}
		int nNewMax;
		if (nNewSize < m_nMaxSize + nGrowBy)
			nNewMax = m_nMaxSize + nGrowBy;  // granularity
		else
			nNewMax = nNewSize;  // no slush

		ASSERT(nNewMax >= m_nMaxSize);  // no wrap around
#ifdef SIZE_T_MAX
		ASSERT(nNewMax <= SIZE_T_MAX/sizeof(void*)); // no overflow
#endif
		void** pNewData = (void**) new byte[nNewMax * sizeof(void*)];

		// copy new data from old
		memcpy(pNewData, m_pData, m_nSize * sizeof(void*));

		// construct remaining elements
		ASSERT(nNewSize > m_nSize);

		memset(&pNewData[m_nSize], 0, (nNewSize-m_nSize) * sizeof(void*));


		// get rid of old stuff (note: no destructors called)
		delete[] (byte*)m_pData;
		m_pData = pNewData;
		m_nSize = nNewSize;
		m_nMaxSize = nNewMax;
	}
}

int IPtrArray::Append(const IPtrArray& src)
{
	ASSERT_VALID(this);
	ASSERT(this != &src);   // cannot append to itself

	int nOldSize = m_nSize;
	SetSize(m_nSize + src.m_nSize);

	memcpy(m_pData + nOldSize, src.m_pData, src.m_nSize * sizeof(void*));

	return nOldSize;
}

void IPtrArray::Copy(const IPtrArray& src)
{
	ASSERT_VALID(this);
	ASSERT(this != &src);   // cannot append to itself

	SetSize(src.m_nSize);

	memcpy(m_pData, src.m_pData, src.m_nSize * sizeof(void*));

}

void IPtrArray::FreeExtra()
{
	ASSERT_VALID(this);

	if (m_nSize != m_nMaxSize)
	{
		// shrink to desired size
#ifdef SIZE_T_MAX
		ASSERT(m_nSize <= SIZE_T_MAX/sizeof(void*)); // no overflow
#endif
		void** pNewData = NULL;
		if (m_nSize != 0)
		{
			pNewData = (void**) new byte[m_nSize * sizeof(void*)];
			// copy new data from old
			memcpy(pNewData, m_pData, m_nSize * sizeof(void*));
		}

		// get rid of old stuff (note: no destructors called)
		delete[] (byte*)m_pData;
		m_pData = pNewData;
		m_nMaxSize = m_nSize;
	}
}

/////////////////////////////////////////////////////////////////////////////

void IPtrArray::SetAtGrow(int nIndex, void* newElement)
{
	ASSERT_VALID(this);
	ASSERT(nIndex >= 0);

	if (nIndex >= m_nSize)
		SetSize(nIndex+1);
	m_pData[nIndex] = newElement;
}

void IPtrArray::InsertAt(int nIndex, void* newElement, int nCount)
{
	ASSERT_VALID(this);
	ASSERT(nIndex >= 0);    // will expand to meet need
	ASSERT(nCount > 0);     // zero or negative size not allowed

	if (nIndex >= m_nSize)
	{
		// adding after the end of the array
		SetSize(nIndex + nCount);  // grow so nIndex is valid
	}
	else
	{
		// inserting in the middle of the array
		int nOldSize = m_nSize;
		SetSize(m_nSize + nCount);  // grow it to new size
		// shift old data up to fill gap
		memmove(&m_pData[nIndex+nCount], &m_pData[nIndex],
			(nOldSize-nIndex) * sizeof(void*));

		// re-init slots we copied from

		memset(&m_pData[nIndex], 0, nCount * sizeof(void*));

	}

	// insert new value in the gap
	ASSERT(nIndex + nCount <= m_nSize);
	while (nCount--)
		m_pData[nIndex++] = newElement;
}

void IPtrArray::RemoveAt(int nIndex, int nCount)
{
	ASSERT_VALID(this);
	ASSERT(nIndex >= 0);
	ASSERT(nCount >= 0);
	ASSERT(nIndex + nCount <= m_nSize);

	// just remove a range
	int nMoveCount = m_nSize - (nIndex + nCount);

	if (nMoveCount)
		memcpy(&m_pData[nIndex], &m_pData[nIndex + nCount],
			nMoveCount * sizeof(void*));
	m_nSize -= nCount;
}

void IPtrArray::InsertAt(int nStartIndex, IPtrArray* pNewArray)
{
	ASSERT_VALID(this);
	ASSERT(pNewArray != NULL);
	ASSERT_KINDOF(IPtrArray, pNewArray);
	ASSERT_VALID(pNewArray);
	ASSERT(nStartIndex >= 0);

	if (pNewArray->GetSize() > 0)
	{
		InsertAt(nStartIndex, pNewArray->GetAt(0), pNewArray->GetSize());
		for (int i = 0; i < pNewArray->GetSize(); i++)
			SetAt(nStartIndex + i, pNewArray->GetAt(i));
	}
}



/////////////////////////////////////////////////////////////////////////////
// Diagnostics

#ifdef _DEBUG
//void IPtrArray::Dump(CDumpContext& dc) const
//{
//	CObject::Dump(dc);
//
//	dc << "with " << m_nSize << " elements";
//	if (dc.GetDepth() > 0)
//	{
//		for (int i = 0; i < m_nSize; i++)
//			dc << "\n\t[" << i << "] = " << m_pData[i];
//	}
//
//	dc << "\n";
//}

void IPtrArray::AssertValid() const
{
	if (m_pData == NULL)
	{
		ASSERT(m_nSize == 0);
		ASSERT(m_nMaxSize == 0);
	}
	else
	{
		ASSERT(m_nSize >= 0);
		ASSERT(m_nMaxSize >= 0);
		ASSERT(m_nSize <= m_nMaxSize);
		ASSERT(AfxIsValidAddress(m_pData, m_nMaxSize * sizeof(void*)));
	}
}
#endif //_DEBUG


/////////////////////////////////////////////////////////////////////////////
