seqstream.hxx

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#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 <mutex>

namespace comphelper
{


// SequenceInputStream
// stream for reading data from a sequence of bytes


class COMPHELPER_DLLPUBLIC SequenceInputStream final
    : public ::cppu::WeakImplHelper< css::io::XInputStream, css::io::XSeekable >
{
    std::mutex    m_aMutex;
    css::uno::Sequence<sal_Int8> const m_aData;
    sal_Int32       m_nPos;

public:
    SequenceInputStream(css::uno::Sequence<sal_Int8> const & rData);

// 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;

private:
    sal_Int32 avail();
};

// 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:
    OSequenceOutputStream(
        css::uno::Sequence< sal_Int8 >& _rSeq,
        double _nResizeFactor = 1.3,
        sal_Int32 _nMinimumResize = 128
        );

    virtual void SAL_CALL writeBytes( const css::uno::Sequence< sal_Int8 >& aData ) override;
    virtual void SAL_CALL flush(  ) override;
    virtual void SAL_CALL closeOutput(  ) override;
};

} // namespace comphelper

#endif // INCLUDED_COMPHELPER_SEQSTREAM_HXX


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