stream.cpp

一套linux下的C++开发库

/***************************************************************************
                          stream.cpp  -  description
                             -------------------
    begin                : Fri Jul 20 2001
    copyright            : (C) 2001 by Mark
    email                : [e-mail]
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/


#include "stream.h"
#include "exception.h"


void CStream::AllocateBuffer()
{
	m_pchGetBuf = new char[m_iBufSize];
	if (!m_pchGetBuf)
		throw CMemException("out of memory.", __FILE__, __LINE__);
		
	m_pchPutBuf = new char[m_iBufSize];
	if(!m_pchPutBuf)
	{
		delete [] m_pchGetBuf, m_pchGetBuf = 0;
		throw CMemException("out of memory.", __FILE__, __LINE__);
	}

	clear();
	setb(m_pchGetBuf, m_pchGetBuf + m_iBufSize, 0);
	setg(m_pchGetBuf, m_pchGetBuf + m_iBufSize, m_pchGetBuf + m_iBufSize);
	setp(m_pchPutBuf, m_pchPutBuf + m_iBufSize);
}


void CStream::FreeBuffer()
{
	//flush will be done in the inherited class.

	if (m_pchGetBuf)
		delete m_pchGetBuf, m_pchGetBuf = 0;
		
	if (m_pchPutBuf)
		delete m_pchPutBuf, m_pchPutBuf = 0;
}


int CStream::sync()
{
	overflow(EOF);
	return 0;
}