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OCL
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OBuffer.cpp
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1996-08-12
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// OCL - OS/2 Class Library
// (c) Cubus 1995
// All Rights Reserved
// OBuffer.cpp
/*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Neither the name Cubus nor the name Team OCL may be used to
* endorse or promote products derived from this software
* without specific prior written permission.
* 3. See OCL.INF for a detailed copyright notice.
*
* THIS SOFTWARE IS PROVIDED ``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 REGENTS 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.
*/
// $Header: W:/Projects/OCL/Source/rcs/OBuffer.cpp 1.50 1996/08/11 23:49:08 B.STEIN Release $
#define __OCL_SOURCE__
#define OINCL_OSTRING
#define OINCL_BASE
#include <ocl.hpp>
#include <OBuffer.hpp>
#include <OMessage.hpp>
OBuffer::OBuffer(const ULONG sizeInBytes,
const ULONG flags)
: memPtr (NULL),
memSize (sizeInBytes),
allocSize (0)
{
APIRET rc;
if ((flags & OBuffer::TILED) &&
(sizeInBytes > OBuffer::TILESIZE))
throw OVioException(OCL::error(20), 0);
if (memSize < OBuffer::PAGESIZE)
throw OVioException(OCL::error(21), 0);
if (flags & OBuffer::COMMIT)
allocSize = memSize;
rc = DosAllocMem((PPVOID) &memPtr,
memSize,
flags);
if (rc != 0)
throw OVioException(OMessage(rc, "OSO001.MSG", OCL::error(22)), rc);
}
OBuffer::~OBuffer()
{
freeBuffer();
}
void OBuffer::commit(const ULONG sizeInBytes)
{
APIRET rc = 0;
if (!memPtr)
throw OVioException("OBuffer, invalid object.", 0, OException::fatal);
if (sizeInBytes < OBuffer::PAGESIZE)
throw OVioException("At least OBuffer::PAGESIZE must be requested.", 0);
if ((sizeInBytes + allocSize) > memSize)
throw OVioException("OBuffer is smaller than requested commit.", 0);
rc = DosSetMem(memPtr, sizeInBytes, OBuffer::COMMIT | OBuffer::DEFAULT);
if (rc != 0)
throw OVioException("DosSetMem failed.", rc);
allocSize += sizeInBytes;
}
void OBuffer::decommit(const ULONG sizeInBytes)
{
APIRET rc = 0;
if (!memPtr)
throw OVioException("OBuffer, invalid object.", 0, OException::fatal);
if (sizeInBytes < OBuffer::PAGESIZE)
throw OVioException("At least OBuffer::PAGESIZE must be requested.", 0);
if (sizeInBytes > allocSize)
throw OVioException("OBuffer is smaller than requested decommit.", 0);
rc = DosSetMem(memPtr, sizeInBytes, OBuffer::DECOMMIT);
if (rc != 0)
throw OVioException("DosSetMem failed.", rc);
allocSize -= sizeInBytes;
}
void OBuffer::freeBuffer()
{
APIRET rc = 0;
if (memPtr != NULL)
rc = DosFreeMem(memPtr);
if (rc != 0)
throw OVioException("DosFreeMem failed.", rc);
}
ULONG OBuffer::allocated()
{
return(memSize);
}
ULONG OBuffer::committed()
{
return(allocSize);
}
PBYTE OBuffer::getPtr()
{
return(memPtr);
}
PSZ OBuffer::isOfType() const
{
return("OBuffer");
}
// end of source