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 {
  43     mpByteReader = dynamic_cast<comphelper::ByteReader*>(xStream.get());
  44     assert(mpByteReader);
  45 }
  46
  47 ByteGrabber::~ByteGrabber()
  48 {
  49 }
  50
  51 void ByteGrabber::setInputStream (const uno::Reference < io::XInputStream >& xNewStream)
  52 {
  53     xStream = xNewStream;
  54     xSeek.set(xNewStream, uno::UNO_QUERY);
  55     mpByteReader = dynamic_cast<comphelper::ByteReader*>(xStream.get());
  56     assert(mpByteReader);
  57 }
  58
  59 sal_Int32 ByteGrabber::readBytes( sal_Int8* aData,
  60                                         sal_Int32 nBytesToRead )
  61 {
  62     return mpByteReader->readSomeBytes(aData, nBytesToRead );
  63 }
  64
  65 // XSeekable chained...
  66 void ByteGrabber::seek( sal_Int64 location )
  67 {
  68     if (!xSeek.is() )
  69         throw io::IOException(THROW_WHERE );
  70
  71     xSeek->seek( location );
  72 }
  73
  74 sal_Int64 ByteGrabber::getPosition(  )
  75 {
  76     if (!xSeek.is() )
  77         throw io::IOException(THROW_WHERE );
  78
  79     return xSeek->getPosition();
  80 }
  81
  82 sal_Int64 ByteGrabber::getLength(  )
  83 {
  84     if (!xSeek.is() )
  85         throw io::IOException(THROW_WHERE );
  86
  87     return xSeek->getLength();
  88 }
  89
  90 sal_uInt16 ByteGrabber::ReadUInt16()
  91 {
  92     if (mpByteReader->readSomeBytes(maBuffer.data(), 2) != 2)
  93         return 0;
  94
  95     return static_cast <sal_uInt16>
  96            ( (maBuffer[0] & 0xFF)
  97           | (maBuffer[1] & 0xFF) << 8);
  98 }
  99
 100 sal_uInt32 ByteGrabber::ReadUInt32()
 101 {
 102     if (mpByteReader->readSomeBytes(maBuffer.data(), 4) != 4)
 103         return 0;
 104
 105     return static_cast < sal_uInt32 >
 106             ( (maBuffer[0] & 0xFF)
 107           | ( maBuffer[1] & 0xFF ) << 8
 108           | ( maBuffer[2] & 0xFF ) << 16
 109           | ( maBuffer[3] & 0xFF ) << 24 );
 110 }
 111
 112 sal_uInt64 ByteGrabber::ReadUInt64()
 113 {
 114     if (mpByteReader->readSomeBytes(maBuffer.data(), 8) != 8)
 115         return 0;
 116
 117     return  static_cast<sal_uInt64>(maBuffer[0] & 0xFF)
 118           | static_cast<sal_uInt64>(maBuffer[1] & 0xFF) << 8
 119           | static_cast<sal_uInt64>(maBuffer[2] & 0xFF) << 16
 120           | static_cast<sal_uInt64>(maBuffer[3] & 0xFF) << 24
 121           | static_cast<sal_uInt64>(maBuffer[4] & 0xFF) << 32
 122           | static_cast<sal_uInt64>(maBuffer[5] & 0xFF) << 40
 123           | static_cast<sal_uInt64>(maBuffer[6] & 0xFF) << 48
 124           | static_cast<sal_uInt64>(maBuffer[7] & 0xFF) << 56;
 125 }
 126
 127 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */