package/source/zipapi/ByteGrabber.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 <ByteGrabber.hxx>
  21 #include <sal/log.hxx>
  22 #include <com/sun/star/io/IOException.hpp>
  23 #include <com/sun/star/io/XSeekable.hpp>
  24 #include <com/sun/star/io/XInputStream.hpp>
  25 #include <com/sun/star/lang/IllegalArgumentException.hpp>
  26
  27 using namespace ::com::sun::star;
  28
  29 #if OSL_DEBUG_LEVEL > 0
  30 #define THROW_WHERE SAL_WHERE
  31 #else
  32 #define THROW_WHERE ""
  33 #endif
  34
  35 /** ByteGrabber implements the >> operators on an XOutputStream. This is
  36  *  potentially quite slow and may need to be optimised
  37  */
  38
  39 ByteGrabber::ByteGrabber(uno::Reference  < io::XInputStream > const & xIstream)
  40 : xStream(xIstream)
  41 , xSeek (xIstream, uno::UNO_QUERY )
  42 , aSequence ( 4 )
  43 {
  44     pSequence = aSequence.getArray();
  45 }
  46
  47 ByteGrabber::~ByteGrabber()
  48 {
  49 }
  50
  51 void ByteGrabber::setInputStream (const uno::Reference < io::XInputStream >& xNewStream)
  52 {
  53     std::scoped_lock aGuard( m_aMutex );
  54     xStream = xNewStream;
  55     xSeek.set(xNewStream, uno::UNO_QUERY);
  56 }
  57
  58 // XInputStream chained
  59 sal_Int32 ByteGrabber::readBytes( uno::Sequence< sal_Int8 >& aData,
  60                                         sal_Int32 nBytesToRead )
  61 {
  62     std::scoped_lock aGuard( m_aMutex );
  63     return xStream->readBytes(aData, nBytesToRead );
  64 }
  65
  66 // XSeekable chained...
  67 void ByteGrabber::seek( sal_Int64 location )
  68 {
  69     std::scoped_lock aGuard( m_aMutex );
  70     if (!xSeek.is() )
  71         throw io::IOException(THROW_WHERE );
  72
  73     xSeek->seek( location );
  74 }
  75
  76 sal_Int64 ByteGrabber::getPosition(  )
  77 {
  78     std::scoped_lock aGuard( m_aMutex );
  79     if (!xSeek.is() )
  80         throw io::IOException(THROW_WHERE );
  81
  82     return xSeek->getPosition();
  83 }
  84
  85 sal_Int64 ByteGrabber::getLength(  )
  86 {
  87     std::scoped_lock aGuard( m_aMutex );
  88     if (!xSeek.is() )
  89         throw io::IOException(THROW_WHERE );
  90
  91     return xSeek->getLength();
  92 }
  93
  94 sal_uInt16 ByteGrabber::ReadUInt16()
  95 {
  96     std::scoped_lock aGuard( m_aMutex );
  97
  98     if (xStream->readBytes(aSequence, 2) != 2)
  99         return 0;
 100
 101     pSequence = aSequence.getConstArray();
 102     return static_cast <sal_uInt16>
 103            ( (pSequence[0] & 0xFF)
 104           | (pSequence[1] & 0xFF) << 8);
 105 }
 106
 107 sal_uInt32 ByteGrabber::ReadUInt32()
 108 {
 109     std::scoped_lock aGuard( m_aMutex );
 110
 111     if (xStream->readBytes(aSequence, 4) != 4)
 112         return 0;
 113
 114     pSequence = aSequence.getConstArray();
 115     return static_cast < sal_uInt32 >
 116             ( (pSequence[0] & 0xFF)
 117           | ( pSequence[1] & 0xFF ) << 8
 118           | ( pSequence[2] & 0xFF ) << 16
 119           | ( pSequence[3] & 0xFF ) << 24 );
 120 }
 121
 122 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */