Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 430 insertions, 0 deletions

diff --git a/sot/source/sdstor/stgcache.cxx b/sot/source/sdstor/stgcache.cxx
new file mode 100644
index 000000000..93f7d3090
--- /dev/null
+++ b/sot/source/sdstor/stgcache.cxx
@@ -0,0 +1,430 @@
+/* -*- 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 .
+ */
+
+#include <string.h>
+#include <o3tl/safeint.hxx>
+#include <osl/endian.h>
+#include <osl/diagnose.h>
+
+#include <sot/stg.hxx>
+#include "stgcache.hxx"
+
+#include <algorithm>
+
+////////////////////////////// class StgPage
+// This class implements buffer functionality. The cache will always return
+// a page buffer, even if a read fails. It is up to the caller to determine
+// the correctness of the I/O.
+
+StgPage::StgPage( short nSize, sal_Int32 nPage )
+    : mnPage( nPage )
+    , mpData( new sal_uInt8[ nSize ] )
+    , mnSize( nSize )
+{
+    OSL_ENSURE( mnSize >= 512, "Unexpected page size is provided!" );
+    // We will write this data to a permanent file later
+    // best to clear if first.
+    memset( mpData.get(), 0, mnSize );
+}
+
+StgPage::~StgPage()
+{
+}
+
+rtl::Reference< StgPage > StgPage::Create( short nData, sal_Int32 nPage )
+{
+    return rtl::Reference< StgPage >( new StgPage( nData, nPage ) );
+}
+
+void StgCache::SetToPage ( const rtl::Reference< StgPage >& rPage, short nOff, sal_Int32 nVal )
+{
+    if( nOff >= 0 && ( o3tl::make_unsigned(nOff) < rPage->GetSize() / sizeof( sal_Int32 ) ) )
+    {
+#ifdef OSL_BIGENDIAN
+        nVal = OSL_SWAPDWORD(nVal);
+#endif
+        static_cast<sal_Int32*>(rPage->GetData())[ nOff ] = nVal;
+        SetDirty( rPage );
+    }
+}
+
+bool StgPage::IsPageGreater( const StgPage *pA, const StgPage *pB )
+{
+    return pA->mnPage < pB->mnPage;
+}
+
+//////////////////////////////// class StgCache
+
+// The disk cache holds the cached sectors. The sector type differ according
+// to their purpose.
+
+static sal_Int32 lcl_GetPageCount( sal_uInt64 nFileSize, short nPageSize )
+{
+//    return (nFileSize >= 512) ? (nFileSize - 512) / nPageSize : 0;
+    // #i61980# real life: last page may be incomplete, return number of *started* pages
+    return (nFileSize >= 512) ? (nFileSize - 512 + nPageSize - 1) / nPageSize : 0;
+}
+
+StgCache::StgCache()
+   : m_nError( ERRCODE_NONE )
+   , m_nPages( 0 )
+   , m_nRef( 0 )
+   , m_nReplaceIdx( 0 )
+   , maLRUPages( 8 ) // entries in the LRU lookup
+   , m_nPageSize( 512 )
+   , m_pStorageStream( nullptr )
+   , m_pStrm( nullptr )
+   , m_bMyStream( false )
+   , m_bFile( false )
+{
+}
+
+StgCache::~StgCache()
+{
+    Clear();
+    SetStrm( nullptr, false );
+}
+
+void StgCache::SetPhysPageSize( short n )
+{
+    OSL_ENSURE( n >= 512, "Unexpected page size is provided!" );
+    if ( n >= 512 )
+    {
+        m_nPageSize = n;
+        sal_uInt64 nFileSize = m_pStrm->TellEnd();
+        m_nPages = lcl_GetPageCount( nFileSize, m_nPageSize );
+    }
+}
+
+// Create a new cache element
+
+rtl::Reference< StgPage > StgCache::Create( sal_Int32 nPg )
+{
+    rtl::Reference< StgPage > xElem( StgPage::Create( m_nPageSize, nPg ) );
+    maLRUPages[ m_nReplaceIdx++ % maLRUPages.size() ] = xElem;
+    return xElem;
+}
+
+// Delete the given element
+
+void StgCache::Erase( const rtl::Reference< StgPage > &xElem )
+{
+    OSL_ENSURE( xElem.is(), "The pointer should not be NULL!" );
+    if ( xElem.is() ) {
+        auto it = std::find_if(maLRUPages.begin(), maLRUPages.end(),
+            [xElem](const rtl::Reference<StgPage>& rxPage) { return rxPage.is() && rxPage->GetPage() == xElem->GetPage(); });
+        if (it != maLRUPages.end())
+            it->clear();
+    }
+}
+
+// remove all cache elements without flushing them
+
+void StgCache::Clear()
+{
+    maDirtyPages.clear();
+    for (auto& rxPage : maLRUPages)
+        rxPage.clear();
+}
+
+// Look for a cached page
+
+rtl::Reference< StgPage > StgCache::Find( sal_Int32 nPage )
+{
+    auto it = std::find_if(maLRUPages.begin(), maLRUPages.end(),
+        [nPage](const rtl::Reference<StgPage>& rxPage) { return rxPage.is() && rxPage->GetPage() == nPage; });
+    if (it != maLRUPages.end())
+        return *it;
+    IndexToStgPage::iterator it2 = maDirtyPages.find( nPage );
+    if ( it2 != maDirtyPages.end() )
+        return it2->second;
+    return rtl::Reference< StgPage >();
+}
+
+// Load a page into the cache
+
+rtl::Reference< StgPage > StgCache::Get( sal_Int32 nPage, bool bForce )
+{
+    rtl::Reference< StgPage > p = Find( nPage );
+    if( !p.is() )
+    {
+        p = Create( nPage );
+        if( !Read( nPage, p->GetData() ) && bForce )
+        {
+            Erase( p );
+            p.clear();
+            SetError( SVSTREAM_READ_ERROR );
+        }
+    }
+    return p;
+}
+
+// Copy an existing page into a new page. Use this routine
+// to duplicate an existing stream or to create new entries.
+// The new page is initially marked dirty. No owner is copied.
+
+rtl::Reference< StgPage > StgCache::Copy( sal_Int32 nNew, sal_Int32 nOld )
+{
+    rtl::Reference< StgPage > p = Find( nNew );
+    if( !p.is() )
+        p = Create( nNew );
+    if( nOld >= 0 )
+    {
+        // old page: we must have this data!
+        rtl::Reference< StgPage > q = Get( nOld, true );
+        if( q.is() )
+        {
+            OSL_ENSURE( p->GetSize() == q->GetSize(), "Unexpected page size!" );
+            memcpy( p->GetData(), q->GetData(), p->GetSize() );
+        }
+    }
+    SetDirty( p );
+
+    return p;
+}
+
+// Historically this wrote pages in a sorted, ascending order;
+// continue that tradition.
+bool StgCache::Commit()
+{
+    if ( Good() ) // otherwise Write does nothing
+    {
+        std::vector< StgPage * > aToWrite;
+        aToWrite.reserve(maDirtyPages.size());
+        for (const auto& rEntry : maDirtyPages)
+            aToWrite.push_back( rEntry.second.get() );
+
+        std::sort( aToWrite.begin(), aToWrite.end(), StgPage::IsPageGreater );
+        for (StgPage* pWr : aToWrite)
+        {
+            const rtl::Reference< StgPage > &pPage = pWr;
+            if ( !Write( pPage->GetPage(), pPage->GetData() ) )
+                return false;
+        }
+    }
+
+    maDirtyPages.clear();
+
+    m_pStrm->Flush();
+    SetError( m_pStrm->GetError() );
+
+    return true;
+}
+
+// Set a stream
+
+void StgCache::SetStrm( SvStream* p, bool bMy )
+{
+    if( m_pStorageStream )
+    {
+        m_pStorageStream->ReleaseRef();
+        m_pStorageStream = nullptr;
+    }
+
+    if( m_bMyStream )
+        delete m_pStrm;
+    m_pStrm = p;
+    m_bMyStream = bMy;
+}
+
+void StgCache::SetStrm( UCBStorageStream* pStgStream )
+{
+    if( m_pStorageStream )
+        m_pStorageStream->ReleaseRef();
+    m_pStorageStream = pStgStream;
+
+    if( m_bMyStream )
+        delete m_pStrm;
+
+    m_pStrm = nullptr;
+
+    if ( m_pStorageStream )
+    {
+        m_pStorageStream->AddFirstRef();
+        m_pStrm = m_pStorageStream->GetModifySvStream();
+    }
+
+    m_bMyStream = false;
+}
+
+void StgCache::SetDirty( const rtl::Reference< StgPage > &rPage )
+{
+    assert( m_pStrm && m_pStrm->IsWritable() );
+    maDirtyPages[ rPage->GetPage() ] = rPage;
+}
+
+// Open/close the disk file
+
+bool StgCache::Open( const OUString& rName, StreamMode nMode )
+{
+    // do not open in exclusive mode!
+    if( nMode & StreamMode::SHARE_DENYALL )
+        nMode = ( ( nMode & ~StreamMode::SHARE_DENYALL ) | StreamMode::SHARE_DENYWRITE );
+    SvFileStream* pFileStrm = new SvFileStream( rName, nMode );
+    // SvStream "feature" Write Open also successful if it does not work
+    bool bAccessDenied = false;
+    if( ( nMode & StreamMode::WRITE ) && !pFileStrm->IsWritable() )
+    {
+        pFileStrm->Close();
+        bAccessDenied = true;
+    }
+    SetStrm( pFileStrm, true );
+    if( pFileStrm->IsOpen() )
+    {
+        sal_uInt64 nFileSize = m_pStrm->TellEnd();
+        m_nPages = lcl_GetPageCount( nFileSize, m_nPageSize );
+        m_pStrm->Seek( 0 );
+    }
+    else
+        m_nPages = 0;
+    m_bFile = true;
+    SetError( bAccessDenied ? ERRCODE_IO_ACCESSDENIED : m_pStrm->GetError() );
+    return Good();
+}
+
+void StgCache::Close()
+{
+    if( m_bFile )
+    {
+        static_cast<SvFileStream*>(m_pStrm)->Close();
+        SetError( m_pStrm->GetError() );
+    }
+}
+
+// low level I/O
+
+bool StgCache::Read( sal_Int32 nPage, void* pBuf )
+{
+    sal_uInt32 nRead = 0, nBytes = m_nPageSize;
+    if( Good() )
+    {
+        /*  #i73846# real life: a storage may refer to a page one-behind the
+            last valid page (see document attached to the issue). In that case
+            (if nPage==nPages), just do nothing here and let the caller work on
+            the empty zero-filled buffer. */
+        if ( nPage > m_nPages )
+            SetError( SVSTREAM_READ_ERROR );
+        else if ( nPage < m_nPages )
+        {
+            sal_uInt32 nPos;
+            sal_Int32 nPg2;
+            // fixed address and size for the header
+            if( nPage == -1 )
+            {
+                nPos = 0;
+                nPg2 = 1;
+                nBytes = 512;
+            }
+            else
+            {
+                nPos = Page2Pos(nPage);
+                nPg2 = ((nPage + 1) > m_nPages) ? m_nPages - nPage : 1;
+            }
+
+            if (m_pStrm->Tell() != nPos)
+                m_pStrm->Seek(nPos);
+
+            if (nPg2 != 1)
+                SetError(SVSTREAM_READ_ERROR);
+            else
+            {
+                nRead = m_pStrm->ReadBytes(pBuf, nBytes);
+                SetError(m_pStrm->GetError());
+            }
+        }
+    }
+
+    if (!Good())
+        return false;
+
+    if (nRead != nBytes)
+        memset(static_cast<sal_uInt8*>(pBuf) + nRead, 0, nBytes - nRead);
+    return true;
+}
+
+bool StgCache::Write( sal_Int32 nPage, void const * pBuf )
+{
+    if( Good() )
+    {
+        sal_uInt32 nPos = Page2Pos( nPage );
+        sal_uInt32 nBytes = m_nPageSize;
+
+        // fixed address and size for the header
+        // nPageSize must be >= 512, otherwise the header can not be written here, we check it on import
+        if( nPage == -1 )
+        {
+            nPos = 0;
+            nBytes = 512;
+        }
+        if( m_pStrm->Tell() != nPos )
+        {
+            m_pStrm->Seek(nPos);
+        }
+        size_t nRes = m_pStrm->WriteBytes( pBuf, nBytes );
+        if( nRes != nBytes )
+            SetError( SVSTREAM_WRITE_ERROR );
+        else
+            SetError( m_pStrm->GetError() );
+    }
+    return Good();
+}
+
+// set the file size in pages
+
+bool StgCache::SetSize( sal_Int32 n )
+{
+    // Add the file header
+    sal_Int32 nSize = n * m_nPageSize + 512;
+    m_pStrm->SetStreamSize( nSize );
+    SetError( m_pStrm->GetError() );
+    if( !m_nError )
+        m_nPages = n;
+    return Good();
+}
+
+void StgCache::SetError( ErrCode n )
+{
+    if( n && !m_nError )
+        m_nError = n;
+}
+
+void StgCache::ResetError()
+{
+    m_nError = ERRCODE_NONE;
+    m_pStrm->ResetError();
+}
+
+void StgCache::MoveError( StorageBase const & r )
+{
+    if( m_nError != ERRCODE_NONE )
+    {
+        r.SetError( m_nError );
+        ResetError();
+    }
+}
+
+// Utility functions
+
+sal_Int32 StgCache::Page2Pos( sal_Int32 nPage ) const
+{
+    if( nPage < 0 ) nPage = 0;
+    return( nPage * m_nPageSize ) + m_nPageSize;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */