oox/source/helper/binarystreambase.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <oox/helper/binarystreambase.hxx>
  21 #include <oox/helper/helper.hxx>
  22
  23 #include <com/sun/star/io/XSeekable.hpp>
  24 #include <osl/diagnose.h>
  25
  26 namespace oox {
  27
  28 using namespace ::com::sun::star::io;
  29 using namespace ::com::sun::star::uno;
  30
  31 BinaryStreamBase::~BinaryStreamBase()
  32 {
  33 }
  34
  35 sal_Int64 BinaryStreamBase::getRemaining() const
  36 {
  37     // do not use isSeekable(), implementations may provide stream position and size even if not seekable
  38     sal_Int64 nPos = tell();
  39     sal_Int64 nLen = size();
  40     return ((nPos >= 0) && (nLen >= 0)) ? ::std::max< sal_Int64 >( nLen - nPos, 0 ) : -1;
  41 }
  42
  43 void BinaryStreamBase::alignToBlock( sal_Int32 nBlockSize, sal_Int64 nAnchorPos )
  44 {
  45     sal_Int64 nStrmPos = tell();
  46     // nothing to do, if stream is at anchor position
  47     if( mbSeekable && (0 <= nAnchorPos) && (nAnchorPos != nStrmPos) && (nBlockSize > 1) )
  48     {
  49         // prevent modulo with negative arguments...
  50         sal_Int64 nSkipSize = (nAnchorPos < nStrmPos) ?
  51             (nBlockSize - ((nStrmPos - nAnchorPos - 1) % nBlockSize) - 1) :
  52             ((nAnchorPos - nStrmPos) % nBlockSize);
  53         seek( nStrmPos + nSkipSize );
  54     }
  55 }
  56
  57 BinaryXSeekableStream::BinaryXSeekableStream( const Reference< XSeekable >& rxSeekable ) :
  58     BinaryStreamBase( rxSeekable.is() ),
  59     mxSeekable( rxSeekable )
  60 {
  61 }
  62
  63 BinaryXSeekableStream::~BinaryXSeekableStream()
  64 {
  65 }
  66
  67 sal_Int64 BinaryXSeekableStream::size() const
  68 {
  69     if( mxSeekable.is() ) try
  70     {
  71         return mxSeekable->getLength();
  72     }
  73     catch( Exception& )
  74     {
  75         OSL_FAIL( "BinaryXSeekableStream::size - exception caught" );
  76     }
  77     return -1;
  78 }
  79
  80 sal_Int64 BinaryXSeekableStream::tell() const
  81 {
  82     if( mxSeekable.is() ) try
  83     {
  84         return mxSeekable->getPosition();
  85     }
  86     catch( Exception& )
  87     {
  88         OSL_FAIL( "BinaryXSeekableStream::tell - exception caught" );
  89     }
  90     return -1;
  91 }
  92
  93 void BinaryXSeekableStream::seek( sal_Int64 nPos )
  94 {
  95     if( mxSeekable.is() ) try
  96     {
  97         mbEof = false;
  98         mxSeekable->seek( nPos );
  99     }
 100     catch( Exception& )
 101     {
 102         mbEof = true;
 103     }
 104 }
 105
 106 void BinaryXSeekableStream::close()
 107 {
 108     mxSeekable.clear();
 109     mbEof = true;
 110 }
 111
 112 SequenceSeekableStream::SequenceSeekableStream( const StreamDataSequence& rData ) :
 113     BinaryStreamBase( true ),
 114     mpData( &rData ),
 115     mnPos( 0 )
 116 {
 117 }
 118
 119 sal_Int64 SequenceSeekableStream::size() const
 120 {
 121     return mpData ? mpData->getLength() : -1;
 122 }
 123
 124 sal_Int64 SequenceSeekableStream::tell() const
 125 {
 126     return mpData ? mnPos : -1;
 127 }
 128
 129 void SequenceSeekableStream::seek( sal_Int64 nPos )
 130 {
 131     if( mpData )
 132     {
 133         mnPos = getLimitedValue< sal_Int32, sal_Int64 >( nPos, 0, mpData->getLength() );
 134         mbEof = mnPos != nPos;
 135     }
 136 }
 137
 138 void SequenceSeekableStream::close()
 139 {
 140     mpData = nullptr;
 141     mbEof = true;
 142 }
 143
 144 } // namespace oox
 145
 146 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */