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 <com/sun/star/io/XSeekable.hpp>
  22 #include <com/sun/star/io/XInputStream.hpp>
  23
  24 using namespace ::com::sun::star;
  25
  26 #if OSL_DEBUG_LEVEL > 0
  27 #define THROW_WHERE SAL_WHERE
  28 #else
  29 #define THROW_WHERE ""
  30 #endif
  31
  32 /** ByteGrabber implements the >> operators on an XOutputStream. This is
  33  *  potentially quite slow and may need to be optimised
  34  */
  35
  36 ByteGrabber::ByteGrabber(uno::Reference  < io::XInputStream > const & xIstream)
  37 : xStream(xIstream)
  38 , xSeek (xIstream, uno::UNO_QUERY )
  39 , aSequence ( 4 )
  40 {
  41     pSequence = aSequence.getArray();
  42 }
  43
  44 ByteGrabber::~ByteGrabber()
  45 {
  46 }
  47
  48 void ByteGrabber::setInputStream (const uno::Reference < io::XInputStream >& xNewStream)
  49 {
  50     ::osl::MutexGuard aGuard( m_aMutex );
  51     xStream = xNewStream;
  52     xSeek.set(xNewStream, uno::UNO_QUERY);
  53 }
  54
  55 // XInputStream chained
  56 sal_Int32 ByteGrabber::readBytes( uno::Sequence< sal_Int8 >& aData,
  57                                         sal_Int32 nBytesToRead )
  58 {
  59     ::osl::MutexGuard aGuard( m_aMutex );
  60     return xStream->readBytes(aData, nBytesToRead );
  61 }
  62
  63 // XSeekable chained...
  64 void ByteGrabber::seek( sal_Int64 location )
  65 {
  66     ::osl::MutexGuard aGuard( m_aMutex );
  67     if (!xSeek.is() )
  68         throw io::IOException(THROW_WHERE );
  69
  70     sal_Int64 nLen = xSeek->getLength();
  71     if ( location < 0 || location > nLen )
  72         throw lang::IllegalArgumentException(THROW_WHERE, uno::Reference< uno::XInterface >(), 1 );
  73     if (location > nLen )
  74         location = nLen;
  75     xSeek->seek( location );
  76 }
  77
  78 sal_Int64 ByteGrabber::getPosition(  )
  79 {
  80     ::osl::MutexGuard aGuard( m_aMutex );
  81     if (!xSeek.is() )
  82         throw io::IOException(THROW_WHERE );
  83
  84     return xSeek->getPosition();
  85 }
  86
  87 sal_Int64 ByteGrabber::getLength(  )
  88 {
  89     ::osl::MutexGuard aGuard( m_aMutex );
  90     if (!xSeek.is() )
  91         throw io::IOException(THROW_WHERE );
  92
  93     return xSeek->getLength();
  94 }
  95
  96 sal_uInt16 ByteGrabber::ReadUInt16()
  97 {
  98     ::osl::MutexGuard aGuard( m_aMutex );
  99
 100     if (xStream->readBytes(aSequence, 2) != 2)
 101         return 0;
 102
 103     pSequence = aSequence.getConstArray();
 104     return static_cast <sal_uInt16>
 105            ( (pSequence[0] & 0xFF)
 106           | (pSequence[1] & 0xFF) << 8);
 107 }
 108
 109 sal_uInt32 ByteGrabber::ReadUInt32()
 110 {
 111     ::osl::MutexGuard aGuard( m_aMutex );
 112
 113     if (xStream->readBytes(aSequence, 4) != 4)
 114         return 0;
 115
 116     pSequence = aSequence.getConstArray();
 117     return static_cast < sal_uInt32 >
 118             ( (pSequence[0] & 0xFF)
 119           | ( pSequence[1] & 0xFF ) << 8
 120           | ( pSequence[2] & 0xFF ) << 16
 121           | ( pSequence[3] & 0xFF ) << 24 );
 122 }
 123
 124 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */