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119 lines
4.0 KiB
119 lines
4.0 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkDataCompressor.cxx,v $
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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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#include "vtkDataCompressor.h"
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#include "vtkUnsignedCharArray.h"
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vtkCxxRevisionMacro(vtkDataCompressor, "$Revision: 1.2 $");
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//----------------------------------------------------------------------------
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vtkDataCompressor::vtkDataCompressor()
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{
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}
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//----------------------------------------------------------------------------
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vtkDataCompressor::~vtkDataCompressor()
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{
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}
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//----------------------------------------------------------------------------
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void vtkDataCompressor::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os,indent);
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}
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//----------------------------------------------------------------------------
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unsigned long
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vtkDataCompressor::Compress(const unsigned char* uncompressedData,
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unsigned long uncompressedSize,
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unsigned char* compressedData,
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unsigned long compressionSpace)
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{
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return this->CompressBuffer(uncompressedData, uncompressedSize,
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compressedData, compressionSpace);
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}
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//----------------------------------------------------------------------------
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unsigned long
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vtkDataCompressor::Uncompress(const unsigned char* compressedData,
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unsigned long compressedSize,
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unsigned char* uncompressedData,
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unsigned long uncompressedSize)
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{
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return this->UncompressBuffer(compressedData, compressedSize,
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uncompressedData, uncompressedSize);
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}
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//----------------------------------------------------------------------------
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vtkUnsignedCharArray*
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vtkDataCompressor::Compress(const unsigned char* uncompressedData,
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unsigned long uncompressedSize)
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{
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// Get the amount of space needed for compressed data.
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unsigned long compressionSpace =
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this->GetMaximumCompressionSpace(uncompressedSize);
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// Allocate a buffer.
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vtkUnsignedCharArray* outputArray = vtkUnsignedCharArray::New();
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outputArray->SetNumberOfComponents(1);
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outputArray->SetNumberOfTuples(compressionSpace);
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unsigned char* compressedData = outputArray->GetPointer(0);
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// Compress the data.
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unsigned long compressedSize =
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this->CompressBuffer(uncompressedData, uncompressedSize,
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compressedData, compressionSpace);
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// Make sure compression succeeded.
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if(!compressedSize)
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{
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outputArray->Delete();
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return 0;
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}
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// Store the actual size.
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outputArray->SetNumberOfTuples(compressedSize);
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return outputArray;
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}
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//----------------------------------------------------------------------------
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vtkUnsignedCharArray*
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vtkDataCompressor::Uncompress(const unsigned char* compressedData,
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unsigned long compressedSize,
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unsigned long uncompressedSize)
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{
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// Allocate a buffer.
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vtkUnsignedCharArray* outputArray = vtkUnsignedCharArray::New();
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outputArray->SetNumberOfComponents(1);
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outputArray->SetNumberOfTuples(uncompressedSize);
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unsigned char* uncompressedData = outputArray->GetPointer(0);
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// Decompress the data.
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unsigned long decSize =
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this->UncompressBuffer(compressedData, compressedSize,
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uncompressedData, uncompressedSize);
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// Make sure the decompression succeeded.
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if(!decSize)
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{
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outputArray->Delete();
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return 0;
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}
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// Store the actual size.
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outputArray->SetNumberOfTuples(decSize);
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return outputArray;
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}
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