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/*=========================================================================
Program: Visualization Toolkit
Module: vtkDataCompressor.cxx
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.
=========================================================================*/
#include "vtkDataCompressor.h"
#include "vtkUnsignedCharArray.h"
//----------------------------------------------------------------------------
vtkDataCompressor::vtkDataCompressor()
{
}
//----------------------------------------------------------------------------
vtkDataCompressor::~vtkDataCompressor()
{
}
//----------------------------------------------------------------------------
void vtkDataCompressor::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
}
//----------------------------------------------------------------------------
size_t
vtkDataCompressor::Compress(unsigned char const* uncompressedData,
size_t uncompressedSize,
unsigned char* compressedData,
size_t compressionSpace)
{
return this->CompressBuffer(uncompressedData, uncompressedSize,
compressedData, compressionSpace);
}
//----------------------------------------------------------------------------
size_t
vtkDataCompressor::Uncompress(unsigned char const* compressedData,
size_t compressedSize,
unsigned char* uncompressedData,
size_t uncompressedSize)
{
return this->UncompressBuffer(compressedData, compressedSize,
uncompressedData, uncompressedSize);
}
//----------------------------------------------------------------------------
vtkUnsignedCharArray*
vtkDataCompressor::Compress(unsigned char const* uncompressedData,
size_t uncompressedSize)
{
// Get the amount of space needed for compressed data.
size_t compressionSpace =
this->GetMaximumCompressionSpace(uncompressedSize);
// Allocate a buffer.
vtkUnsignedCharArray* outputArray = vtkUnsignedCharArray::New();
outputArray->SetNumberOfComponents(1);
outputArray->SetNumberOfTuples(compressionSpace);
unsigned char* compressedData = outputArray->GetPointer(0);
// Compress the data.
size_t compressedSize =
this->CompressBuffer(uncompressedData, uncompressedSize,
compressedData, compressionSpace);
// Make sure compression succeeded.
if(!compressedSize)
{
outputArray->Delete();
return 0;
}
// Store the actual size.
outputArray->SetNumberOfTuples(compressedSize);
return outputArray;
}
//----------------------------------------------------------------------------
vtkUnsignedCharArray*
vtkDataCompressor::Uncompress(unsigned char const* compressedData,
size_t compressedSize,
size_t uncompressedSize)
{
// Allocate a buffer.
vtkUnsignedCharArray* outputArray = vtkUnsignedCharArray::New();
outputArray->SetNumberOfComponents(1);
outputArray->SetNumberOfTuples(uncompressedSize);
unsigned char* uncompressedData = outputArray->GetPointer(0);
// Decompress the data.
size_t decSize =
this->UncompressBuffer(compressedData, compressedSize,
uncompressedData, uncompressedSize);
// Make sure the decompression succeeded.
if(!decSize)
{
outputArray->Delete();
return 0;
}
// Store the actual size.
outputArray->SetNumberOfTuples(decSize);
return outputArray;
}
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