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/* Copyright (c) 1996-2004, Adaptec Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the Adaptec Corporation nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __DYNSIZE_H
#define __DYNSIZE_H
/****************************************************************************
*
* Created: 1/18/2000
*
*****************************************************************************
*
* File Name: DynSize.h
* Module: Generic
* Contributors: David Dillard
* Description: Contains the declaration of the DynamicSizeInStreamBuf
* class.
* Version Control:
*
* $Revision$
* $NoKeywords: $
* $Log$
* Revision 1.1.1.1 2004-05-05 12:41:44 bap
* Imported upstream version 0.0.4.
*
*****************************************************************************/
/*** INCLUDES ***/
#include <config.h>
#if HAVE_IOSTREAM
# include <iostream>
#else
# if HAVE_IOSTREAM_H
# include <iostream.h>
# endif
#endif
#include <stdio.h>
/*** DEFINES ***/
#ifdef _DPT_DOS
#define MaxBufSize (24 * 1024)
#else
#define MaxBufSize ((unsigned) 63 * (unsigned) 1024)
#endif
#define MinBufSize 1024
#define BufSizeDecrement 2048
//Class - DynamicSizeInStreamBuf
//===========================================================================
//
//Description:
//
// This class is a base class for other streambuf classes which wish to
// dynamically adjust to the amount of memory that is available to the
// application. This is particularly useful in a DOS environment, where
// memory is inherently a scarce resource.
//
//---------------------------------------------------------------------------
class DynamicSizeInStreamBuf : public std::streambuf
{
protected:
//
// Allocates a maximually sized buffer based on the maximum, minimum, and
// decrement sizes specified.
//
size_t AllocBuf(
size_t maxSize,
size_t minSize,
size_t decrementSize
);
//
// Allocates a maximually sized buffer based on some defaults and the
// the amount of available memory.
//
inline size_t AllocBuf(void)
{
return(AllocBuf(MaxBufSize, MinBufSize, BufSizeDecrement));
}
};
#endif
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