include/comphelper/seekableinput.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   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 #ifndef INCLUDED_COMPHELPER_SEEKABLEINPUT_HXX
  20 #define INCLUDED_COMPHELPER_SEEKABLEINPUT_HXX
  21
  22 #include <com/sun/star/uno/Reference.hxx>
  23 #include <com/sun/star/io/XInputStream.hpp>
  24 #include <com/sun/star/io/XSeekable.hpp>
  25 #include <cppuhelper/implbase.hxx>
  26 #include <comphelper/comphelperdllapi.h>
  27 #include <mutex>
  28
  29 namespace com::sun::star::uno { class XComponentContext; }
  30
  31 namespace comphelper
  32 {
  33
  34 class SAL_DLLPUBLIC_TEMPLATE OSeekableInputWrapper_BASE
  35     : public ::cppu::WeakImplHelper< css::io::XInputStream,
  36                                      css::io::XSeekable >
  37 {};
  38
  39 class COMPHELPER_DLLPUBLIC OSeekableInputWrapper final
  40     : public OSeekableInputWrapper_BASE
  41 {
  42     std::mutex    m_aMutex;
  43
  44     css::uno::Reference< css::uno::XComponentContext > m_xContext;
  45
  46     css::uno::Reference< css::io::XInputStream > m_xOriginalStream;
  47
  48     css::uno::Reference< css::io::XInputStream > m_xCopyInput;
  49     css::uno::Reference< css::io::XSeekable > m_xCopySeek;
  50
  51 private:
  52     COMPHELPER_DLLPRIVATE void PrepareCopy_Impl();
  53
  54 public:
  55     OSeekableInputWrapper(
  56                 css::uno::Reference< css::io::XInputStream > xInStream,
  57                 css::uno::Reference< css::uno::XComponentContext > xContext );
  58
  59     virtual ~OSeekableInputWrapper() override;
  60
  61     static css::uno::Reference< css::io::XInputStream > CheckSeekableCanWrap(
  62                         const css::uno::Reference< css::io::XInputStream >& xInStream,
  63                         const css::uno::Reference< css::uno::XComponentContext >& rxContext );
  64
  65 // XInputStream
  66     virtual sal_Int32 SAL_CALL readBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead ) override;
  67     virtual sal_Int32 SAL_CALL readSomeBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead ) override;
  68     virtual void SAL_CALL skipBytes( sal_Int32 nBytesToSkip ) override;
  69     virtual sal_Int32 SAL_CALL available() override;
  70     virtual void SAL_CALL closeInput() override;
  71
  72 // XSeekable
  73     virtual void SAL_CALL seek( sal_Int64 location ) override;
  74     virtual sal_Int64 SAL_CALL getPosition() override;
  75     virtual sal_Int64 SAL_CALL getLength() override;
  76
  77 };
  78
  79 }   // namespace comphelper
  80
  81 #endif
  82
  83 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */