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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_SOT_SOURCE_SDSTOR_STGCACHE_HXX
#define INCLUDED_SOT_SOURCE_SDSTOR_STGCACHE_HXX
#include <o3tl/safeint.hxx>
#include <osl/endian.h>
#include <rtl/ref.hxx>
#include <tools/stream.hxx>
#include "stgelem.hxx"
#include <salhelper/simplereferenceobject.hxx>
#include <memory>
#include <unordered_map>
class UCBStorageStream;
class StgPage;
class StorageBase;
class StgCache
{
typedef std::unordered_map
<
sal_Int32, rtl::Reference< StgPage >
> IndexToStgPage;
typedef std::vector< rtl::Reference< StgPage > > LRUList;
ErrCode m_nError; // error code
sal_Int32 m_nPages; // size of data area in pages
sal_uInt16 m_nRef; // reference count
IndexToStgPage maDirtyPages; // hash of all dirty pages
int m_nReplaceIdx; // index into maLRUPages to replace next
LRUList maLRUPages; // list of last few non-dirty pages.
short m_nPageSize; // page size of the file
UCBStorageStream* m_pStorageStream; // holds reference to UCB storage stream
void Erase( const rtl::Reference< StgPage >& ); // delete a cache element
rtl::Reference< StgPage > Create( sal_Int32 ); // create a cached page
SvStream* m_pStrm; // physical stream
bool m_bMyStream; // true: delete stream in dtor
protected:
bool m_bFile; // true: file stream
sal_Int32 Page2Pos( sal_Int32 ) const; // page address --> file position
public:
StgCache();
~StgCache();
void IncRef() { m_nRef++; }
sal_uInt16 DecRef() { return --m_nRef; }
void SetPhysPageSize( short );
sal_Int32 GetPhysPages() const { return m_nPages; }
short GetPhysPageSize() const { return m_nPageSize; }
SvStream* GetStrm() { return m_pStrm; }
void SetStrm( SvStream*, bool );
void SetStrm( UCBStorageStream* );
bool Good() const { return m_nError == ERRCODE_NONE; }
ErrCode const & GetError() const { return m_nError; }
void MoveError( StorageBase const & );
void SetError( ErrCode );
void ResetError();
bool Open( const OUString& rName, StreamMode );
void Close();
bool Read( sal_Int32 nPage, void* pBuf );
bool Write( sal_Int32 nPage, void const * pBuf );
// two routines for accessing FAT pages
// Assume that the data is a FAT page and get/put FAT data.
void SetToPage ( const rtl::Reference< StgPage >& rPage, short nOff, sal_Int32 nVal );
static inline sal_Int32 GetFromPage ( const rtl::Reference< StgPage >& rPage, short nOff );
void SetDirty ( const rtl::Reference< StgPage > &rPage );
bool SetSize( sal_Int32 nPages );
rtl::Reference< StgPage > Find( sal_Int32 ); // find a cached page
rtl::Reference< StgPage > Get( sal_Int32, bool ); // get a cached page
rtl::Reference< StgPage > Copy( sal_Int32, sal_Int32=STG_FREE ); // copy a page
bool Commit(); // flush all pages
void Clear(); // clear the cache
};
class StgPage : public salhelper::SimpleReferenceObject
{
const sal_Int32 mnPage; // page index
std::unique_ptr<sal_uInt8[]>
mpData; // nSize bytes
short mnSize; // size of this page
StgPage( short nData, sal_Int32 nPage );
virtual ~StgPage() override;
public:
StgPage(const StgPage&) = delete;
StgPage& operator=(const StgPage&) = delete;
static rtl::Reference< StgPage > Create( short nData, sal_Int32 nPage );
sal_Int32 GetPage() const { return mnPage; }
void* GetData() { return mpData.get(); }
short GetSize() const { return mnSize; }
public:
static bool IsPageGreater( const StgPage *pA, const StgPage *pB );
};
inline sal_Int32 StgCache::GetFromPage ( const rtl::Reference< StgPage >& rPage, short nOff )
{
if( nOff < 0 || ( o3tl::make_unsigned(nOff) >= rPage->GetSize() / sizeof( sal_Int32 ) ) )
return -1;
sal_Int32 n = static_cast<sal_Int32*>(rPage->GetData())[ nOff ];
#ifdef OSL_BIGENDIAN
return OSL_SWAPDWORD(n);
#else
return n;
#endif
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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