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| -rw-r--r-- | include/comphelper/seqstream.hxx | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/include/comphelper/seqstream.hxx b/include/comphelper/seqstream.hxx new file mode 100644 index 0000000000..8e2ae36d17 --- /dev/null +++ b/include/comphelper/seqstream.hxx @@ -0,0 +1,139 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ +#ifndef INCLUDED_COMPHELPER_SEQSTREAM_HXX +#define INCLUDED_COMPHELPER_SEQSTREAM_HXX + +#include <config_options.h> +#include <com/sun/star/uno/Sequence.hxx> +#include <com/sun/star/io/XInputStream.hpp> +#include <com/sun/star/io/XOutputStream.hpp> +#include <com/sun/star/io/XSeekable.hpp> +#include <cppuhelper/implbase.hxx> +#include <comphelper/comphelperdllapi.h> +#include <comphelper/bytereader.hxx> +#include <mutex> + +namespace comphelper +{ + +/** Base class for wrappers around memory data that want to be exposed as an XInputStream */ +class COMPHELPER_DLLPUBLIC MemoryInputStream + : public ::cppu::WeakImplHelper< css::io::XInputStream, css::io::XSeekable >, + public comphelper::ByteReader +{ + std::mutex m_aMutex; + const sal_Int8* m_pMemoryData; + sal_Int32 m_nMemoryDataLength; + sal_Int32 m_nPos; + +public: + MemoryInputStream(const sal_Int8* pData, sal_Int32 nDataLength); + +// css::io::XInputStream + virtual sal_Int32 SAL_CALL readBytes( css::uno::Sequence<sal_Int8>& aData, sal_Int32 nBytesToRead ) override; + + virtual sal_Int32 SAL_CALL readSomeBytes( css::uno::Sequence<sal_Int8>& aData, sal_Int32 nMaxBytesToRead ) override; + + virtual void SAL_CALL skipBytes( sal_Int32 nBytesToSkip ) override; + + virtual sal_Int32 SAL_CALL available( ) override; + + virtual void SAL_CALL closeInput( ) override; + + virtual void SAL_CALL seek( sal_Int64 location ) override; + virtual sal_Int64 SAL_CALL getPosition( ) override; + virtual sal_Int64 SAL_CALL getLength( ) override; + +// comphelper::ByteReader + virtual sal_Int32 readSomeBytes( sal_Int8* pData, sal_Int32 nBytesToRead ) override; + +private: + sal_Int32 avail(); +}; + + +// Stream for reading data from a sequence of bytes +class COMPHELPER_DLLPUBLIC SequenceInputStream final + : public MemoryInputStream +{ + css::uno::Sequence<sal_Int8> const m_aData; + +public: + SequenceInputStream(css::uno::Sequence<sal_Int8> const & rData); +}; + +// don't export to avoid duplicate WeakImplHelper definitions with MSVC +class SAL_DLLPUBLIC_TEMPLATE OSequenceOutputStream_Base + : public ::cppu::WeakImplHelper< css::io::XOutputStream > +{}; + +class UNLESS_MERGELIBS(COMPHELPER_DLLPUBLIC) OSequenceOutputStream final : public OSequenceOutputStream_Base +{ +private: + css::uno::Sequence< sal_Int8 >& m_rSequence; + double m_nResizeFactor; + sal_Int32 const m_nMinimumResize; + sal_Int32 m_nSize; + // the size of the virtual stream. This is not the size of the sequence, but the number of bytes written + // into the stream at a given moment. + + bool m_bConnected; + // closeOutput has been called ? + + std::mutex m_aMutex; + + void finalizeOutput(); + virtual ~OSequenceOutputStream() override { if (m_bConnected) finalizeOutput(); } + +public: + /** constructs the object. Everything written into the stream through the XOutputStream methods will be forwarded + to the sequence, reallocating it if necessary. Writing will start at offset 0 within the sequence. + @param _rSeq a reference to the sequence which will be used for output. + The caller is responsible for taking care of the lifetime of the stream + object and the sequence. If you're in doubt about this, use <code>closeOutput</code> + before destroying the sequence + @param _nResizeFactor the factor which is used for resizing the sequence when necessary. In every + resize step, the new sequence size will be calculated by multiplying the current + size with this factor, rounded off to the next multiple of 4. + @param _nMinimumResize the minimal number of bytes which is additionally allocated on resizing + @see closeOutput + */ + OSequenceOutputStream( + css::uno::Sequence< sal_Int8 >& _rSeq, + double _nResizeFactor = 1.3, + sal_Int32 _nMinimumResize = 128 + ); + + /// same as XOutputStream::writeBytes (as expected :) + virtual void SAL_CALL writeBytes( const css::uno::Sequence< sal_Int8 >& aData ) override; + /// this is a dummy in this implementation, no buffering is used + virtual void SAL_CALL flush( ) override; + /** closes the output stream. In the case of this class, this means that the sequence used for writing is + resized to the really used size and not used any further, every subsequent call to one of the XOutputStream + methods will throw a <code>NotConnectedException</code>. + */ + virtual void SAL_CALL closeOutput( ) override; +}; + +} // namespace comphelper + +#endif // INCLUDED_COMPHELPER_SEQSTREAM_HXX + + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |