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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 .
+ */
+
+
+#include <string.h>
+
+#include <o3tl/safeint.hxx>
+#include <rtl/ustring.hxx>
+#include <com/sun/star/lang/Locale.hpp>
+#include <unotools/charclass.hxx>
+#include <sot/stg.hxx>
+#include "stgelem.hxx"
+#include "stgio.hxx"
+
+static const sal_uInt16 nMaxLegalStr = 31;
+
+static const sal_uInt8 cStgSignature[ 8 ] = { 0xD0,0xCF,0x11,0xE0,0xA1,0xB1,0x1A,0xE1 };
+
+////////////////////////////// struct ClsId
+
+SvStream& ReadClsId( SvStream& r, ClsId& rId )
+{
+ r.ReadUInt32( rId.Data1 )
+ .ReadUInt16( rId.Data2 )
+ .ReadUInt16( rId.Data3 )
+ .ReadUChar( rId.Data4[0] )
+ .ReadUChar( rId.Data4[1] )
+ .ReadUChar( rId.Data4[2] )
+ .ReadUChar( rId.Data4[3] )
+ .ReadUChar( rId.Data4[4] )
+ .ReadUChar( rId.Data4[5] )
+ .ReadUChar( rId.Data4[6] )
+ .ReadUChar( rId.Data4[7] );
+ return r;
+}
+
+SvStream& WriteClsId( SvStream& r, const ClsId& rId )
+{
+ return
+ r .WriteUInt32( rId.Data1 )
+ .WriteUInt16( rId.Data2 )
+ .WriteUInt16( rId.Data3 )
+ .WriteUChar( rId.Data4[0] )
+ .WriteUChar( rId.Data4[1] )
+ .WriteUChar( rId.Data4[2] )
+ .WriteUChar( rId.Data4[3] )
+ .WriteUChar( rId.Data4[4] )
+ .WriteUChar( rId.Data4[5] )
+ .WriteUChar( rId.Data4[6] )
+ .WriteUChar( rId.Data4[7] );
+}
+
+///////////////////////////// class StgHeader
+
+StgHeader::StgHeader()
+: m_nVersion( 0 )
+, m_nByteOrder( 0 )
+, m_nPageSize( 0 )
+, m_nDataPageSize( 0 )
+, m_bDirty( sal_uInt8(false) )
+, m_nFATSize( 0 )
+, m_nTOCstrm( 0 )
+, m_nReserved( 0 )
+, m_nThreshold( 0 )
+, m_nDataFAT( 0 )
+, m_nDataFATSize( 0 )
+, m_nMasterChain( 0 )
+, m_nMaster( 0 )
+{
+}
+
+void StgHeader::Init()
+{
+ memcpy( m_cSignature, cStgSignature, 8 );
+ memset( &m_aClsId, 0, sizeof( ClsId ) );
+ m_nVersion = 0x0003003B;
+ m_nByteOrder = 0xFFFE;
+ m_nPageSize = 9; // 512 bytes
+ m_nDataPageSize = 6; // 64 bytes
+ m_bDirty = sal_uInt8(false);
+ memset( m_cReserved, 0, sizeof( m_cReserved ) );
+ m_nFATSize = 0;
+ m_nTOCstrm = 0;
+ m_nReserved = 0;
+ m_nThreshold = 4096;
+ m_nDataFAT = 0;
+ m_nDataFATSize = 0;
+ m_nMasterChain = STG_EOF;
+
+ SetTOCStart( STG_EOF );
+ SetDataFATStart( STG_EOF );
+ for( short i = 0; i < cFATPagesInHeader; i++ )
+ SetFATPage( i, STG_FREE );
+}
+
+bool StgHeader::Load( StgIo& rIo )
+{
+ bool bResult = false;
+ if ( rIo.GetStrm() )
+ {
+ SvStream& r = *rIo.GetStrm();
+ bResult = Load( r );
+ bResult = ( bResult && rIo.Good() );
+ }
+
+ return bResult;
+}
+
+bool StgHeader::Load( SvStream& r )
+{
+ r.Seek( 0 );
+ r.ReadBytes( m_cSignature, 8 );
+ ReadClsId( r, m_aClsId ); // 08 Class ID
+ r.ReadInt32( m_nVersion ) // 1A version number
+ .ReadUInt16( m_nByteOrder ) // 1C Unicode byte order indicator
+ .ReadInt16( m_nPageSize ) // 1E 1 << nPageSize = block size
+ .ReadInt16( m_nDataPageSize ); // 20 1 << this size == data block size
+ if (!r.good())
+ return false;
+ if (!checkSeek(r, r.Tell() + 10))
+ return false;
+ r.ReadInt32( m_nFATSize ) // 2C total number of FAT pages
+ .ReadInt32( m_nTOCstrm ) // 30 starting page for the TOC stream
+ .ReadInt32( m_nReserved ) // 34
+ .ReadInt32( m_nThreshold ) // 38 minimum file size for big data
+ .ReadInt32( m_nDataFAT ) // 3C page # of 1st data FAT block
+ .ReadInt32( m_nDataFATSize ) // 40 # of data FATpages
+ .ReadInt32( m_nMasterChain ) // 44 chain to the next master block
+ .ReadInt32( m_nMaster ); // 48 # of additional master blocks
+ for(sal_Int32 & i : m_nMasterFAT)
+ r.ReadInt32( i );
+
+ return r.good() && Check();
+}
+
+bool StgHeader::Store( StgIo& rIo )
+{
+ if( !m_bDirty )
+ return true;
+
+ SvStream& r = *rIo.GetStrm();
+ r.Seek( 0 );
+ r.WriteBytes( m_cSignature, 8 );
+ WriteClsId( r, m_aClsId ); // 08 Class ID
+ r.WriteInt32( m_nVersion ) // 1A version number
+ .WriteUInt16( m_nByteOrder ) // 1C Unicode byte order indicator
+ .WriteInt16( m_nPageSize ) // 1E 1 << nPageSize = block size
+ .WriteInt16( m_nDataPageSize ) // 20 1 << this size == data block size
+ .WriteInt32( 0 ).WriteInt32( 0 ).WriteInt16( 0 )
+ .WriteInt32( m_nFATSize ) // 2C total number of FAT pages
+ .WriteInt32( m_nTOCstrm ) // 30 starting page for the TOC stream
+ .WriteInt32( m_nReserved ) // 34
+ .WriteInt32( m_nThreshold ) // 38 minimum file size for big data
+ .WriteInt32( m_nDataFAT ) // 3C page # of 1st data FAT block
+ .WriteInt32( m_nDataFATSize ) // 40 # of data FAT pages
+ .WriteInt32( m_nMasterChain ) // 44 chain to the next master block
+ .WriteInt32( m_nMaster ); // 48 # of additional master blocks
+ for(sal_Int32 i : m_nMasterFAT)
+ r.WriteInt32( i );
+ m_bDirty = sal_uInt8(!rIo.Good());
+ return !m_bDirty;
+}
+
+static bool lcl_wontoverflow(short shift)
+{
+ return shift >= 0 && shift < short(sizeof(short)) * 8 - 1;
+}
+
+static bool isKnownSpecial(sal_Int32 nLocation)
+{
+ return (nLocation == STG_FREE ||
+ nLocation == STG_EOF ||
+ nLocation == STG_FAT ||
+ nLocation == STG_MASTER);
+}
+
+// Perform thorough checks also on unknown variables
+bool StgHeader::Check()
+{
+ return memcmp( m_cSignature, cStgSignature, 8 ) == 0
+ && static_cast<short>( m_nVersion >> 16 ) == 3
+ && m_nPageSize == 9
+ && lcl_wontoverflow(m_nPageSize)
+ && lcl_wontoverflow(m_nDataPageSize)
+ && m_nFATSize > 0
+ && m_nTOCstrm >= 0
+ && m_nThreshold > 0
+ && ( isKnownSpecial(m_nDataFAT) || ( m_nDataFAT >= 0 && m_nDataFATSize > 0 ) )
+ && ( isKnownSpecial(m_nMasterChain) || m_nMasterChain >=0 )
+ && m_nMaster >= 0;
+}
+
+sal_Int32 StgHeader::GetFATPage( short n ) const
+{
+ if( n >= 0 && n < cFATPagesInHeader )
+ return m_nMasterFAT[ n ];
+ else
+ return STG_EOF;
+}
+
+void StgHeader::SetFATPage( short n, sal_Int32 nb )
+{
+ if( n >= 0 && n < cFATPagesInHeader )
+ {
+ if( m_nMasterFAT[ n ] != nb )
+ {
+ m_bDirty = sal_uInt8(true);
+ m_nMasterFAT[ n ] = nb;
+ }
+ }
+}
+
+void StgHeader::SetTOCStart( sal_Int32 n )
+{
+ if( n != m_nTOCstrm )
+ {
+ m_bDirty = sal_uInt8(true);
+ m_nTOCstrm = n;
+ }
+}
+
+void StgHeader::SetDataFATStart( sal_Int32 n )
+{
+ if( n != m_nDataFAT )
+ {
+ m_bDirty = sal_uInt8(true);
+ m_nDataFAT = n;
+ }
+}
+
+void StgHeader::SetDataFATSize( sal_Int32 n )
+{
+ if( n != m_nDataFATSize )
+ {
+ m_bDirty = sal_uInt8(true);
+ m_nDataFATSize = n;
+ }
+}
+
+void StgHeader::SetFATSize( sal_Int32 n )
+{
+ if( n != m_nFATSize )
+ {
+ m_bDirty = sal_uInt8(true);
+ m_nFATSize = n;
+ }
+}
+
+void StgHeader::SetFATChain( sal_Int32 n )
+{
+ if( n != m_nMasterChain )
+ {
+ m_bDirty = sal_uInt8(true);
+ m_nMasterChain = n;
+ }
+}
+
+void StgHeader::SetMasters( sal_Int32 n )
+{
+ if( n != m_nMaster )
+ {
+ m_bDirty = sal_uInt8(true);
+ m_nMaster = n;
+ }
+}
+
+///////////////////////////// class StgEntry
+
+void StgEntry::Init()
+{
+ memset( m_nName, 0, sizeof( m_nName ) );
+ m_nNameLen = 0;
+ m_cType = 0;
+ m_cFlags = 0;
+ m_nLeft = 0;
+ m_nRight = 0;
+ m_nChild = 0;
+ memset( &m_aClsId, 0, sizeof( m_aClsId ) );
+ m_nFlags = 0;
+ m_nMtime[0] = 0; m_nMtime[1] = 0;
+ m_nAtime[0] = 0; m_nAtime[1] = 0;
+ m_nPage1 = 0;
+ m_nSize = 0;
+ m_nUnknown = 0;
+
+ SetLeaf( STG_LEFT, STG_FREE );
+ SetLeaf( STG_RIGHT, STG_FREE );
+ SetLeaf( STG_CHILD, STG_FREE );
+ SetLeaf( STG_DATA, STG_EOF );
+}
+
+static OUString ToUpperUnicode( const OUString & rStr )
+{
+ // I don't know the locale, so en_US is hopefully fine
+ static CharClass aCC( LanguageTag( css::lang::Locale( "en", "US", "" )) );
+ return aCC.uppercase( rStr );
+}
+
+void StgEntry::SetName( const OUString& rName )
+{
+ // I don't know the locale, so en_US is hopefully fine
+ m_aName = ToUpperUnicode( rName );
+ if(m_aName.getLength() > nMaxLegalStr)
+ {
+ m_aName = m_aName.copy(0, nMaxLegalStr);
+ }
+
+ sal_Int32 i;
+ for( i = 0; i < rName.getLength() && i <= nMaxLegalStr; i++ )
+ {
+ m_nName[ i ] = rName[ i ];
+ }
+ while (i <= nMaxLegalStr)
+ {
+ m_nName[ i++ ] = 0;
+ }
+ m_nNameLen = ( rName.getLength() + 1 ) << 1;
+}
+
+sal_Int32 StgEntry::GetLeaf( StgEntryRef eRef ) const
+{
+ sal_Int32 n = -1;
+ switch( eRef )
+ {
+ case STG_LEFT: n = m_nLeft; break;
+ case STG_RIGHT: n = m_nRight; break;
+ case STG_CHILD: n = m_nChild; break;
+ case STG_DATA: n = m_nPage1; break;
+ }
+ return n;
+}
+
+void StgEntry::SetLeaf( StgEntryRef eRef, sal_Int32 nPage )
+{
+ switch( eRef )
+ {
+ case STG_LEFT: m_nLeft = nPage; break;
+ case STG_RIGHT: m_nRight = nPage; break;
+ case STG_CHILD: m_nChild = nPage; break;
+ case STG_DATA: m_nPage1 = nPage; break;
+ }
+}
+
+void StgEntry::SetClassId( const ClsId& r )
+{
+ memcpy( &m_aClsId, &r, sizeof( ClsId ) );
+}
+
+void StgEntry::GetName( OUString& rName ) const
+{
+ sal_uInt16 n = m_nNameLen;
+ if( n )
+ n = ( n >> 1 ) - 1;
+ rName = OUString(m_nName, n);
+}
+
+// Compare two entries. Do this case-insensitive.
+
+sal_Int32 StgEntry::Compare( const StgEntry& r ) const
+{
+ if (r.m_nNameLen != m_nNameLen)
+ return r.m_nNameLen > m_nNameLen ? 1 : -1;
+ else
+ return r.m_aName.compareTo(m_aName);
+}
+
+// These load/store operations are a bit more complicated,
+// since they have to copy their contents into a packed structure.
+
+bool StgEntry::Load(const void* pFrom, sal_uInt32 nBufSize, sal_uInt64 nUnderlyingStreamSize)
+{
+ if ( nBufSize < 128 )
+ return false;
+
+ SvMemoryStream r( const_cast<void *>(pFrom), nBufSize, StreamMode::READ );
+ for(sal_Unicode & i : m_nName)
+ r.ReadUtf16( i ); // 00 name as WCHAR
+ r.ReadUInt16( m_nNameLen ) // 40 size of name in bytes including 00H
+ .ReadUChar( m_cType ) // 42 entry type
+ .ReadUChar( m_cFlags ) // 43 0 or 1 (tree balance?)
+ .ReadInt32( m_nLeft ) // 44 left node entry
+ .ReadInt32( m_nRight ) // 48 right node entry
+ .ReadInt32( m_nChild ); // 4C 1st child entry if storage
+ ReadClsId( r, m_aClsId ); // 50 class ID (optional)
+ r.ReadInt32( m_nFlags ) // 60 state flags(?)
+ .ReadInt32( m_nMtime[ 0 ] ) // 64 modification time
+ .ReadInt32( m_nMtime[ 1 ] ) // 64 modification time
+ .ReadInt32( m_nAtime[ 0 ] ) // 6C creation and access time
+ .ReadInt32( m_nAtime[ 1 ] ) // 6C creation and access time
+ .ReadInt32( m_nPage1 ) // 74 starting block (either direct or translated)
+ .ReadInt32( m_nSize ) // 78 file size
+ .ReadInt32( m_nUnknown ); // 7C unknown
+
+ sal_uInt16 n = m_nNameLen;
+ if( n )
+ n = ( n >> 1 ) - 1;
+
+ if (n > nMaxLegalStr)
+ return false;
+
+ if (m_cType != STG_STORAGE)
+ {
+ if (m_nPage1 < 0 && !isKnownSpecial(m_nPage1))
+ {
+ //bad pageid
+ return false;
+ }
+ if (m_cType == STG_EMPTY)
+ {
+ /*
+ tdf#112399 opens fine in MSOffice 2013 despite a massive m_nSize field
+
+ Free (unused) directory entries are marked with Object Type 0x0
+ (unknown or unallocated). The entire directory entry must consist of
+ all zeroes except for the child, right sibling, and left sibling
+ pointers, which must be initialized to NOSTREAM (0xFFFFFFFF).
+ */
+ m_nSize = 0;
+ }
+ if (m_nSize < 0)
+ {
+ // the size makes no sense for the substorage
+ // TODO/LATER: actually the size should be an unsigned value, but
+ // in this case it would mean a stream of more than 2Gb
+ return false;
+ }
+ if (o3tl::make_unsigned(m_nSize) > nUnderlyingStreamSize)
+ {
+ // surely an entry cannot be larger than the underlying file
+ return false;
+ }
+
+ }
+
+ m_aName = OUString(m_nName , n);
+ // I don't know the locale, so en_US is hopefully fine
+ m_aName = ToUpperUnicode( m_aName );
+ if(m_aName.getLength() > nMaxLegalStr)
+ {
+ m_aName = m_aName.copy(0, nMaxLegalStr);
+ }
+
+ return true;
+}
+
+void StgEntry::Store( void* pTo )
+{
+ SvMemoryStream r( pTo, 128, StreamMode::WRITE );
+ for(sal_Unicode i : m_nName)
+ r.WriteUInt16( i ); // 00 name as WCHAR
+ r.WriteUInt16( m_nNameLen ) // 40 size of name in bytes including 00H
+ .WriteUChar( m_cType ) // 42 entry type
+ .WriteUChar( m_cFlags ) // 43 0 or 1 (tree balance?)
+ .WriteInt32( m_nLeft ) // 44 left node entry
+ .WriteInt32( m_nRight ) // 48 right node entry
+ .WriteInt32( m_nChild ); // 4C 1st child entry if storage;
+ WriteClsId( r, m_aClsId ); // 50 class ID (optional)
+ r.WriteInt32( m_nFlags ) // 60 state flags(?)
+ .WriteInt32( m_nMtime[ 0 ] ) // 64 modification time
+ .WriteInt32( m_nMtime[ 1 ] ) // 64 modification time
+ .WriteInt32( m_nAtime[ 0 ] ) // 6C creation and access time
+ .WriteInt32( m_nAtime[ 1 ] ) // 6C creation and access time
+ .WriteInt32( m_nPage1 ) // 74 starting block (either direct or translated)
+ .WriteInt32( m_nSize ) // 78 file size
+ .WriteInt32( m_nUnknown ); // 7C unknown
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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