dox/IO/Core/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);

  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);
protected:
  vtkDataCompressor();
  ~vtkDataCompressor();

  // 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&);  // Not implemented.
  void operator=(const vtkDataCompressor&);  // Not implemented.
};

#endif