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/*************************************************************************
*
* $RCSfile: stgcache.hxx,v $
*
* $Revision: 1.4 $
*
* last change: $Author: vg $ $Date: 2003-07-22 11:12:58 $
*
* The Contents of this file are made available subject to the terms of
* either of the following licenses
*
* - GNU Lesser General Public License Version 2.1
* - Sun Industry Standards Source License Version 1.1
*
* Sun Microsystems Inc., October, 2000
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2000 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*
* Sun Industry Standards Source License Version 1.1
* =================================================
* The contents of this file are subject to the Sun Industry Standards
* Source License Version 1.1 (the "License"); You may not use this file
* except in compliance with the License. You may obtain a copy of the
* License at http://www.openoffice.org/license.html.
*
* Software provided under this License is provided on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
* See the License for the specific provisions governing your rights and
* obligations concerning the Software.
*
* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
*
* Copyright: 2000 by Sun Microsystems, Inc.
*
* All Rights Reserved.
*
* Contributor(s): _______________________________________
*
*
************************************************************************/
#ifndef _STGCACHE_HXX
#define _STGCACHE_HXX
#ifndef _TOOLS_SOLAR_H
#include <tools/solar.h>
#endif
#ifndef _TOOLS_STREAM_HXX
#include <tools/stream.hxx>
#endif
#ifndef _STGELEM_HXX
#include <stgelem.hxx>
#endif
class UCBStorageStream;
class StgIo;
class StgPage;
class StgDirEntry;
class StorageBase;
class StgCache {
StgPage* pCur; // top of LRU list
StgPage* pElem1; // top of ordered list
ULONG nError; // error code
INT32 nPages; // size of data area in pages
USHORT nRef; // reference count
void * pLRUCache; // hash table of cached objects
short nPageSize; // page size of the file
UCBStorageStream* pStorageStream; // holds reference to UCB storage stream
void Erase( StgPage* ); // delete a cache element
void InsertToLRU( StgPage* ); // insert into LRU list
void InsertToOrdered( StgPage* ); // insert into ordered list
StgPage* Create( INT32 ); // create a cached page
protected:
SvStream* pStrm; // physical stream
BOOL bMyStream; // TRUE: delete stream in dtor
BOOL bFile; // TRUE: file stream
INT32 Page2Pos( INT32 ); // page address --> file position
INT32 Pos2Page( INT32 ); // file position --> page address
public:
StgCache();
~StgCache();
void IncRef() { nRef++; }
USHORT DecRef() { return --nRef; }
void SetPhysPageSize( short );
INT32 GetPhysPages() { return nPages; }
short GetPhysPageSize() { return nPageSize; }
SvStream* GetStrm() { return pStrm; }
void SetStrm( SvStream*, BOOL );
void SetStrm( UCBStorageStream* );
BOOL IsWritable() { return pStrm->IsWritable(); }
BOOL Good() { return BOOL( nError == SVSTREAM_OK ); }
BOOL Bad() { return BOOL( nError != SVSTREAM_OK ); }
ULONG GetError() { return nError; }
void MoveError( StorageBase& );
void SetError( ULONG );
void ResetError();
BOOL Open( const String& rName, StreamMode );
void Close();
BOOL Read( INT32 nPage, void* pBuf, INT32 nPages );
BOOL Write( INT32 nPage, void* pBuf, INT32 nPages );
BOOL SetSize( INT32 nPages );
StgPage* Find( INT32 ); // find a cached page
StgPage* Get( INT32, BOOL ); // get a cached page
StgPage* Copy( INT32, INT32=STG_FREE ); // copy a page
BOOL Commit( StgDirEntry* = NULL ); // flush all pages
void Revert( StgDirEntry* = NULL ); // revert dirty pages
void Clear(); // clear the cache
};
class StgPage {
friend class StgCache;
StgCache* pCache; // the cache
StgPage *pNext1, *pLast1; // LRU chain
StgPage *pNext2, *pLast2; // ordered chain
StgDirEntry* pOwner; // owner
INT32 nPage; // page #
BYTE* pData; // nPageSize characters
short nData; // size of this page
BOOL bDirty; // dirty flag
StgPage( StgCache*, short );
~StgPage();
public:
void SetDirty() { bDirty = TRUE; }
INT32 GetPage() { return nPage; }
void* GetData() { return pData; }
short GetSize() { return nData; }
void SetOwner( StgDirEntry* p ) { pOwner = p; }
// routines for accessing FAT pages
// Assume that the data is a FAT page and get/put FAT data.
INT32 GetPage( short nOff )
{
if( ( nOff >= (short) ( nData / sizeof( INT32 ) ) ) || nOff < 0 )
return -1;
INT32 n = ((INT32*) pData )[ nOff ];
#ifdef __BIGENDIAN
return SWAPLONG(n);
#else
return n;
#endif
}
void SetPage( short, INT32 ); // put an element
};
#endif
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