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92 lines
2.6 KiB
C++
92 lines
2.6 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkInputStream.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkInputStream
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* @brief Wraps a binary input stream with a VTK interface.
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*
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* vtkInputStream provides a VTK-style interface wrapping around a
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* standard input stream. The access methods are virtual so that
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* subclasses can transparently provide decoding of an encoded stream.
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* Data lengths for Seek and Read calls refer to the length of the
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* input data. The actual length in the stream may differ for
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* subclasses that implement an encoding scheme.
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*/
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#ifndef vtkInputStream_h
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#define vtkInputStream_h
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#include "vtkIOCoreModule.h" // For export macro
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#include "vtkObject.h"
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class VTKIOCORE_EXPORT vtkInputStream : public vtkObject
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{
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public:
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vtkTypeMacro(vtkInputStream, vtkObject);
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static vtkInputStream* New();
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void PrintSelf(ostream& os, vtkIndent indent) override;
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//@{
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/**
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* Get/Set the real input stream.
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*/
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vtkSetMacro(Stream, istream*);
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vtkGetMacro(Stream, istream*);
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//@}
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/**
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* Called after the stream position has been set by the caller, but
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* before any Seek or Read calls. The stream position should not be
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* adjusted by the caller until after an EndReading call.
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*/
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virtual void StartReading();
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/**
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* Seek to the given offset in the input data. Returns 1 for
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* success, 0 for failure.
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*/
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virtual int Seek(vtkTypeInt64 offset);
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/**
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* Read input data of the given length. Returns amount actually
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* read.
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*/
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virtual size_t Read(void* data, size_t length);
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/**
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* Called after all desired calls to Seek and Read have been made.
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* After this call, the caller is free to change the position of the
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* stream. Additional reads should not be done until after another
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* call to StartReading.
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*/
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virtual void EndReading();
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protected:
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vtkInputStream();
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~vtkInputStream() override;
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// The real input stream.
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istream* Stream;
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size_t ReadStream(char* data, size_t length);
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// The input stream's position when StartReading was called.
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vtkTypeInt64 StreamStartPosition;
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private:
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vtkInputStream(const vtkInputStream&) = delete;
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void operator=(const vtkInputStream&) = delete;
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};
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#endif
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