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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkBase64InputStream
* @brief Reads base64-encoded input from a stream.
*
* vtkBase64InputStream implements base64 decoding with the
* vtkInputStream interface.
*/
#ifndef vtkBase64InputStream_h
#define vtkBase64InputStream_h
#include "vtkIOCoreModule.h" // For export macro
#include "vtkInputStream.h"
VTK_ABI_NAMESPACE_BEGIN
class VTKIOCORE_EXPORT vtkBase64InputStream : public vtkInputStream
{
public:
vtkTypeMacro(vtkBase64InputStream, vtkInputStream);
static vtkBase64InputStream* New();
void PrintSelf(ostream& os, vtkIndent indent) override;
/**
* Called after the stream position has been set by the caller, but
* before any Seek or Read calls. The stream position should not be
* adjusted by the caller until after an EndReading call.
*/
void StartReading() override;
/**
* Seek to the given offset in the input data. Returns 1 for
* success, 0 for failure.
*/
int Seek(vtkTypeInt64 offset) override;
/**
* Read input data of the given length. Returns amount actually
* read.
*/
size_t Read(void* data, size_t length) override;
/**
* Called after all desired calls to Seek and Read have been made.
* After this call, the caller is free to change the position of the
* stream. Additional reads should not be done until after another
* call to StartReading.
*/
void EndReading() override;
protected:
vtkBase64InputStream();
~vtkBase64InputStream() override;
// Number of decoded bytes left in Buffer from last call to Read.
int BufferLength;
unsigned char Buffer[2];
// Reads 4 bytes from the input stream and decodes them into 3 bytes.
int DecodeTriplet(unsigned char& c0, unsigned char& c1, unsigned char& c2);
private:
vtkBase64InputStream(const vtkBase64InputStream&) = delete;
void operator=(const vtkBase64InputStream&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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