//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TWArraysAr.cpp
// = Version	:   ver2.0
// = Author		:   xlc
// = CreateDate	:   2002-09-09
// = Description:   ÀàµÄ¶¨Òå
// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#include "StdAfx.h"
#include "TWArraysAr.h"

TWArraysAr::TWArraysAr(long unitSize)
	: m_iUnitSize(unitSize)
{

}

TWArraysAr::~TWArraysAr()
{

}

long TWArraysAr::GetUnitSize()const
{
	return m_iUnitSize;
}

long TWArraysAr::GetUnit(long i)const
{
	return i / GetUnitSize();
}

long TWArraysAr::GetSubIndex(long i)const
{
	return i % GetUnitSize();
}

void TWArraysAr::Clear()
{
	TWArchive::Clear();
	m_bufTable.Clear();
}

void TWArraysAr::Read(void *p, long size)
{	
	if (GetLength() - GetCur() < size)
	{
		size = GetLength() - GetCur();
	}

	char *pData = (char*)p;
	long i = 0;
	
	for (m_bufTable.MoveTo(GetUnit(GetCur())); i < size && !m_bufTable.IsOut(); m_bufTable.MoveToNext())
	{
		TWArrayAr &ar = m_bufTable.GetCurPData();
		if (i == 0)
		{
			ar.MoveTo(GetSubIndex(GetCur()));
		}
		else
		{
			ar.MoveToFirst();
		}

		long num = size - i;
		if (num > GetUnitSize() - ar.GetCur())
		{
			num = GetUnitSize() - ar.GetCur();
		}
		ar.Read(pData,num);

		pData += num;
		i += num;
	}
}

void TWArraysAr::Write(void *p, long size)
{
	long iEndUnit = GetUnit(GetCur() + size - 1);
	while (m_bufTable.GetLength() <= iEndUnit)
	{
		TWArrayAr* pAr = new TWArrayAr(GetUnitSize());
		pAr->SetLength(GetUnitSize());
		m_bufTable.AddTail(pAr);
	}

	char *pData = (char*)p;
	long i = 0;
	for (m_bufTable.MoveTo(GetUnit(GetCur())); i < size; m_bufTable.MoveToNext())
	{
		TWArrayAr &ar = m_bufTable.GetCurPData();
		if (i == 0)
		{
			ar.MoveTo(GetSubIndex(GetCur()));
		}
		else
		{
			ar.MoveToFirst();
		}

		long num = size - i;
		if (num > GetUnitSize() - ar.GetCur())
		{
			num = GetUnitSize() - ar.GetCur();
		}
		ar.Write(pData,num);

		pData += num;
		i += num;
	}

	if ((GetCur() + size) > m_iLength)
	{
		m_iLength = GetCur() + size;
	}
}