diff options
Diffstat (limited to 'sot/source/sdstor/stgstrms.hxx')
| -rw-r--r-- | sot/source/sdstor/stgstrms.hxx | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/sot/source/sdstor/stgstrms.hxx b/sot/source/sdstor/stgstrms.hxx new file mode 100644 index 000000000..51c08faf5 --- /dev/null +++ b/sot/source/sdstor/stgstrms.hxx @@ -0,0 +1,168 @@ +/* -*- 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_STGSTRMS_HXX +#define INCLUDED_SOT_SOURCE_SDSTOR_STGSTRMS_HXX + +#include <tools/stream.hxx> +#include <o3tl/sorted_vector.hxx> +#include <rtl/ref.hxx> +#include <vector> +#include <memory> + +class StgIo; +class StgStrm; +class StgPage; +class StgDirEntry; + +// The FAT class performs FAT operations on an underlying storage stream. +// This stream is either the physical FAT stream (bPhys == true ) or a normal +// storage stream, which then holds the FAT for small data allocations. + +class StgFAT +{ // FAT allocator + StgStrm& m_rStrm; // underlying stream + sal_Int32 m_nMaxPage; // highest page allocated so far + short m_nPageSize; // physical page size + short m_nEntries; // FAT entries per page + short m_nOffset; // current offset within page + sal_Int32 m_nLimit; // search limit recommendation + bool m_bPhys; // true: physical FAT + rtl::Reference< StgPage > GetPhysPage( sal_Int32 nPage ); + bool MakeChain( sal_Int32 nStart, sal_Int32 nPages ); + bool InitNew( sal_Int32 nPage1 ); +public: + StgFAT( StgStrm& rStrm, bool bMark ); + sal_Int32 FindBlock( sal_Int32& nPages ); + sal_Int32 GetNextPage( sal_Int32 nPg ); + sal_Int32 AllocPages( sal_Int32 nStart, sal_Int32 nPages ); + bool FreePages( sal_Int32 nStart, bool bAll ); + sal_Int32 GetMaxPage() const { return m_nMaxPage; } + void SetLimit( sal_Int32 n ) { m_nLimit = n; } +}; + +// The base stream class provides basic functionality for seeking +// and accessing the data on a physical basis. It uses the built-in +// FAT class for the page allocations. + +class StgStrm { // base class for all streams +private: + sal_Int32 m_nPos; // current byte position + bool m_bBytePosValid; // what Pos2Page returns for m_nPos +protected: + StgIo& m_rIo; // I/O system + std::unique_ptr<StgFAT> m_pFat; // FAT stream for allocations + StgDirEntry* m_pEntry; // dir entry (for ownership) + sal_Int32 m_nStart; // 1st data page + sal_Int32 m_nSize; // stream size in bytes + sal_Int32 m_nPage; // current logical page + short m_nOffset; // offset into current page + short m_nPageSize; // logical page size + std::vector<sal_Int32> m_aPagesCache; + o3tl::sorted_vector<sal_Int32> m_aUsedPageNumbers; + sal_Int32 scanBuildPageChainCache(); + bool Copy( sal_Int32 nFrom, sal_Int32 nBytes ); + void SetPos(sal_Int32 nPos, bool bValid) { m_nPos = nPos; m_bBytePosValid = bValid; } + explicit StgStrm( StgIo& ); +public: + virtual ~StgStrm(); + StgIo& GetIo() { return m_rIo; } + sal_Int32 GetPos() const { return m_nPos; } + sal_Int32 GetStart() const { return m_nStart; } + sal_Int32 GetSize() const { return m_nSize; } + sal_Int32 GetPage() const { return m_nPage; } + sal_Int32 GetPages() const { return ( m_nSize + m_nPageSize - 1 ) / m_nPageSize;} + short GetOffset() const { return m_nOffset;} + void SetEntry( StgDirEntry& ); + virtual bool SetSize( sal_Int32 ); + virtual bool Pos2Page( sal_Int32 nBytePos ); + virtual sal_Int32 Read( void*, sal_Int32 ) { return 0; } + virtual sal_Int32 Write( const void*, sal_Int32 ) { return 0; } + virtual bool IsSmallStrm() const { return false; } +}; + +// The FAT stream class provides physical access to the master FAT. +// Since this access is implemented as a StgStrm, we can use the +// FAT allocator. + +class StgFATStrm : public StgStrm { // the master FAT stream + virtual bool Pos2Page( sal_Int32 nBytePos ) override; + bool SetPage( short, sal_Int32 ); +public: + explicit StgFATStrm(StgIo&, sal_Int32 nFatStrmSize); + using StgStrm::GetPage; + sal_Int32 GetPage(sal_Int32, bool, sal_uInt16 *pnMasterAlloc = nullptr); + virtual bool SetSize( sal_Int32 ) override; +}; + +// The stream has a size increment which normally is 1, but which can be +// set to any value is you want the size to be incremented by certain values. + +class StgDataStrm : public StgStrm // a physical data stream +{ + short m_nIncr; // size adjust increment + void Init( sal_Int32 nBgn, sal_Int32 nLen ); +public: + StgDataStrm( StgIo&, sal_Int32 nBgn, sal_Int32 nLen=-1 ); + StgDataStrm( StgIo&, StgDirEntry& ); + void* GetPtr( sal_Int32 nPos, bool bDirty ); + void SetIncrement( short n ) { m_nIncr = n ; } + virtual bool SetSize( sal_Int32 ) override; + virtual sal_Int32 Read( void*, sal_Int32 ) override; + virtual sal_Int32 Write( const void*, sal_Int32 ) override; +}; + +// The small stream class provides access to streams with a size < 4096 bytes. +// This stream is a StgStream containing small pages. The FAT for this stream +// is also a StgStream. The start of the FAT is in the header at DataRootPage, +// the stream itself is pointed to by the root entry (it holds start & size). + +class StgSmallStrm : public StgStrm // a logical data stream +{ + StgStrm* m_pData; // the data stream + void Init( sal_Int32 nBgn, sal_Int32 nLen ); +public: + StgSmallStrm( StgIo&, sal_Int32 nBgn ); + StgSmallStrm( StgIo&, StgDirEntry& ); + virtual sal_Int32 Read( void*, sal_Int32 ) override; + virtual sal_Int32 Write( const void*, sal_Int32 ) override; + virtual bool IsSmallStrm() const override { return true; } +}; + +class StgTmpStrm : public SvMemoryStream +{ + OUString m_aName; + SvFileStream* m_pStrm; + using SvMemoryStream::GetData; + virtual std::size_t GetData( void* pData, std::size_t nSize ) override; + virtual std::size_t PutData( const void* pData, std::size_t nSize ) override; + virtual sal_uInt64 SeekPos( sal_uInt64 nPos ) override; + virtual void FlushData() override; + +public: + explicit StgTmpStrm( sal_uInt64=16 ); + virtual ~StgTmpStrm() override; + bool Copy( StgTmpStrm& ); + virtual void SetSize( sal_uInt64 ) override; + sal_uInt64 GetSize() const; +}; + +#endif + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |