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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.
*/
/****************************************************************************
*
* Created: 1/18/2000
*
*****************************************************************************
*
* File Name: DynSize.cpp
* Module:
* Contributors: David Dillard
* Description: Contains the implementation of the DynamicSizeInStreamBuf
* class.
* Version Control:
*
* $Revision$
* $NoKeywords: $
* $Log$
* Revision 1.1.1.1 2004-04-29 10:20:13 bap
* Imported upstream version 0.0.4.
*
*****************************************************************************/
/*** INCLUDES ***/
#include "dynsize.h"
//=============================================================================
//
//Name: DynamicSizeInStreamBuf::AllocBuf
//
//Abstract: Allocates a variable size buffer, based upon available memory,
// for buffering data.
//
//Parameters: maxSize - Maximum size, in bytes, of the buffer to be allocated
// minSize - Minimum size, in bytes, of the buffer to be allocated
// decrementSize - The size, in bytes, to decrement with each
// allocation attempt until the allocation is made or
// until 'minSize' is passed
//
//Return Values: The size, in bytes, of the buffer that was allocated. If
// there was insufficient memory to allocate a buffer of
// 'minSize' bytes then zero is returned.
//
//Error Codes: None
//
//Global Variables Affected: None
//
//Notes: None
//
//-----------------------------------------------------------------------------
size_t DynamicSizeInStreamBuf::AllocBuf(
size_t maxSize,
size_t minSize,
size_t decrementSize
)
{
size_t allocatedSize = 0;
//
// Loop trying to get the maximum amount of memory possible.
//
for ( size_t curSize = maxSize; curSize >= minSize; curSize -= decrementSize )
{
char *buf = new char[curSize];
if ( buf != NULL )
{
#if !defined __MWERKS__ && !defined(__GXX_ABI_VERSION)
setb(buf, buf + curSize, 1);
#else
pubsetbuf (buf, curSize);
#endif
setg(buf, buf, buf);
setp(NULL, NULL);
allocatedSize = curSize;
break;
}
}
//
// Return the number of bytes allocated to the caller.
//
return(allocatedSize);
}
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