unotools/source/streaming/streamhelper.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 <sal/config.h>
  21
  22 #include <com/sun/star/io/BufferSizeExceededException.hpp>
  23 #include <com/sun/star/io/IOException.hpp>
  24 #include <com/sun/star/io/NotConnectedException.hpp>
  25 #include <o3tl/safeint.hxx>
  26 #include <unotools/streamhelper.hxx>
  27
  28 namespace utl
  29 {
  30
  31 sal_Int32 SAL_CALL OInputStreamHelper::readBytes(css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead)
  32 {
  33     if (!m_xLockBytes.is())
  34         throw css::io::NotConnectedException(OUString(), getXWeak());
  35
  36     if (nBytesToRead < 0)
  37         throw css::io::BufferSizeExceededException(OUString(), getXWeak());
  38
  39     std::scoped_lock aGuard( m_aMutex );
  40     if (aData.getLength() < nBytesToRead)
  41         aData.realloc(nBytesToRead);
  42
  43     std::size_t nRead(0);
  44     ErrCode nError = m_xLockBytes->ReadAt(m_nActPos, static_cast<void*>(aData.getArray()), nBytesToRead, &nRead);
  45     m_nActPos += nRead;
  46
  47     if (nError != ERRCODE_NONE)
  48         throw css::io::IOException(OUString(), getXWeak());
  49
  50     // adjust sequence if data read is lower than the desired data
  51     if (nRead < o3tl::make_unsigned(aData.getLength()))
  52         aData.realloc( nRead );
  53
  54     return nRead;
  55 }
  56
  57 void SAL_CALL OInputStreamHelper::seek( sal_Int64 location )
  58 {
  59     std::scoped_lock aGuard( m_aMutex );
  60     m_nActPos = location;
  61 }
  62
  63 sal_Int64 SAL_CALL OInputStreamHelper::getPosition(  )
  64 {
  65     return m_nActPos;
  66 }
  67
  68 sal_Int64 SAL_CALL OInputStreamHelper::getLength(  )
  69 {
  70     if (!m_xLockBytes.is())
  71         return 0;
  72
  73     std::scoped_lock aGuard( m_aMutex );
  74     SvLockBytesStat aStat;
  75     m_xLockBytes->Stat( &aStat );
  76     return aStat.nSize;
  77 }
  78
  79 sal_Int32 SAL_CALL OInputStreamHelper::readSomeBytes(css::uno::Sequence< sal_Int8 >& aData,
  80                                                      sal_Int32 nMaxBytesToRead)
  81 {
  82     // read all data desired
  83     return readBytes(aData, nMaxBytesToRead);
  84 }
  85
  86 void SAL_CALL OInputStreamHelper::skipBytes(sal_Int32 nBytesToSkip)
  87 {
  88     std::scoped_lock aGuard( m_aMutex );
  89     if (!m_xLockBytes.is())
  90         throw css::io::NotConnectedException(OUString(), getXWeak());
  91
  92     if (nBytesToSkip < 0)
  93         throw css::io::BufferSizeExceededException(OUString(), getXWeak());
  94
  95     m_nActPos += nBytesToSkip;
  96 }
  97
  98 sal_Int32 SAL_CALL OInputStreamHelper::available()
  99 {
 100     std::scoped_lock aGuard( m_aMutex );
 101     if (!m_xLockBytes.is())
 102         throw css::io::NotConnectedException(OUString(), getXWeak());
 103
 104     return m_nAvailable;
 105 }
 106
 107 void SAL_CALL OInputStreamHelper::closeInput()
 108 {
 109     std::scoped_lock aGuard( m_aMutex );
 110     if (!m_xLockBytes.is())
 111         throw css::io::NotConnectedException(OUString(), getXWeak());
 112
 113     m_xLockBytes = nullptr;
 114 }
 115
 116 void SAL_CALL OInputStreamHelper::acquire() SAL_NOEXCEPT
 117 {
 118     cppu::WeakImplHelper<css::io::XInputStream, css::io::XSeekable>::acquire();
 119 }
 120
 121 } // namespace utl
 122
 123 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */