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80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkBase64InputStream.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 vtkBase64InputStream
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* @brief Reads base64-encoded input from a stream.
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*
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* vtkBase64InputStream implements base64 decoding with the
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* vtkInputStream interface.
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*/
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#ifndef vtkBase64InputStream_h
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#define vtkBase64InputStream_h
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#include "vtkIOCoreModule.h" // For export macro
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#include "vtkInputStream.h"
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class VTKIOCORE_EXPORT vtkBase64InputStream : public vtkInputStream
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{
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public:
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vtkTypeMacro(vtkBase64InputStream, vtkInputStream);
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static vtkBase64InputStream* New();
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void PrintSelf(ostream& os, vtkIndent indent) override;
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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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void StartReading() override;
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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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int Seek(vtkTypeInt64 offset) override;
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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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size_t Read(void* data, size_t length) override;
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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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void EndReading() override;
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protected:
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vtkBase64InputStream();
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~vtkBase64InputStream() override;
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// Number of decoded bytes left in Buffer from last call to Read.
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int BufferLength;
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unsigned char Buffer[2];
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// Reads 4 bytes from the input stream and decodes them into 3 bytes.
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int DecodeTriplet(unsigned char& c0, unsigned char& c1, unsigned char& c2);
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private:
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vtkBase64InputStream(const vtkBase64InputStream&) = delete;
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void operator=(const vtkBase64InputStream&) = delete;
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};
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#endif
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