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 > 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 (uno::Reference < io::XInputStream > xNewStream)
  49 {
  50     ::osl::MutexGuard aGuard( m_aMutex );
  51     xStream = xNewStream;
  52     xSeek = uno::Reference < io::XSeekable > (xNewStream, uno::UNO_QUERY);
  53 }
  54
  55 // XInputStream chained
  56 sal_Int32 SAL_CALL ByteGrabber::readBytes( uno::Sequence< sal_Int8 >& aData,
  57                                         sal_Int32 nBytesToRead )
  58     throw(io::NotConnectedException, io::BufferSizeExceededException, io::IOException, uno::RuntimeException)
  59 {
  60     ::osl::MutexGuard aGuard( m_aMutex );
  61     return xStream->readBytes(aData, nBytesToRead );
  62 }
  63
  64 // XSeekable chained...
  65 sal_Int64 SAL_CALL ByteGrabber::seek( sal_Int64 location )
  66     throw(lang::IllegalArgumentException, io::IOException, uno::RuntimeException)
  67 {
  68     ::osl::MutexGuard aGuard( m_aMutex );
  69     if (xSeek.is() )
  70     {
  71         sal_Int64 nLen = xSeek->getLength();
  72         if ( location < 0 || location > nLen )
  73             throw lang::IllegalArgumentException(THROW_WHERE, uno::Reference< uno::XInterface >(), 1 );
  74         if (location > nLen )
  75             location = nLen;
  76         xSeek->seek( location );
  77         return location;
  78     }
  79     else
  80         throw io::IOException(THROW_WHERE );
  81 }
  82
  83 sal_Int64 SAL_CALL ByteGrabber::getPosition(  )
  84         throw(io::IOException, uno::RuntimeException)
  85 {
  86     ::osl::MutexGuard aGuard( m_aMutex );
  87     if (xSeek.is() )
  88         return xSeek->getPosition();
  89     else
  90         throw io::IOException(THROW_WHERE );
  91 }
  92
  93 sal_Int64 SAL_CALL ByteGrabber::getLength(  )
  94         throw(io::IOException, uno::RuntimeException)
  95 {
  96     ::osl::MutexGuard aGuard( m_aMutex );
  97     if (xSeek.is() )
  98         return xSeek->getLength();
  99     else
 100         throw io::IOException(THROW_WHERE );
 101 }
 102
 103 sal_uInt16 ByteGrabber::ReadUInt16()
 104 {
 105     ::osl::MutexGuard aGuard( m_aMutex );
 106
 107     if (xStream->readBytes(aSequence, 2) != 2)
 108         return 0;
 109
 110     pSequence = aSequence.getConstArray();
 111     return static_cast <sal_uInt16>
 112            ( (pSequence[0] & 0xFF)
 113           | (pSequence[1] & 0xFF) << 8);
 114 }
 115
 116 sal_uInt32 ByteGrabber::ReadUInt32()
 117 {
 118     ::osl::MutexGuard aGuard( m_aMutex );
 119
 120     if (xStream->readBytes(aSequence, 4) != 4)
 121         return 0;
 122
 123     pSequence = aSequence.getConstArray();
 124     return static_cast < sal_uInt32 >
 125             ( (pSequence[0] & 0xFF)
 126           | ( pSequence[1] & 0xFF ) << 8
 127           | ( pSequence[2] & 0xFF ) << 16
 128           | ( pSequence[3] & 0xFF ) << 24 );
 129 }
 130
 131 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */