vtkDataCompressor.h

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/*=========================================================================
 
  Program:   Visualization Toolkit
  Module:    vtkDataCompressor.h
 
  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
 
     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.
 
=========================================================================*/
#ifndef vtkDataCompressor_h
#define vtkDataCompressor_h
 
#include "vtkIOCoreModule.h" // For export macro
#include "vtkObject.h"
 
class vtkUnsignedCharArray;
 
class VTKIOCORE_EXPORT vtkDataCompressor : public vtkObject
{
public:
  vtkTypeMacro(vtkDataCompressor, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  virtual size_t GetMaximumCompressionSpace(size_t size) = 0;
 
  size_t Compress(unsigned char const* uncompressedData, size_t uncompressedSize,
    unsigned char* compressedData, size_t compressionSpace);
 
  size_t Uncompress(unsigned char const* compressedData, size_t compressedSize,
    unsigned char* uncompressedData, size_t uncompressedSize);
 
  vtkUnsignedCharArray* Compress(unsigned char const* uncompressedData, size_t uncompressedSize);
 
  vtkUnsignedCharArray* Uncompress(
    unsigned char const* compressedData, size_t compressedSize, size_t uncompressedSize);
 
  virtual void SetCompressionLevel(int compressionLevel) = 0;
  virtual int GetCompressionLevel() = 0;
 
protected:
  vtkDataCompressor();
  ~vtkDataCompressor() override;
 
  // Actual compression method.  This must be provided by a subclass.
  // Must return the size of the compressed data, or zero on error.
  virtual size_t CompressBuffer(unsigned char const* uncompressedData, size_t uncompressedSize,
    unsigned char* compressedData, size_t compressionSpace) = 0;
  // Actual decompression method.  This must be provided by a subclass.
  // Must return the size of the uncompressed data, or zero on error.
  virtual size_t UncompressBuffer(unsigned char const* compressedData, size_t compressedSize,
    unsigned char* uncompressedData, size_t uncompressedSize) = 0;
 
private:
  vtkDataCompressor(const vtkDataCompressor&) = delete;
  void operator=(const vtkDataCompressor&) = delete;
};
 
#endif