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97 lines
3.4 KiB
97 lines
3.4 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkZLibDataCompressor.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 "vtkZLibDataCompressor.h"
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#include "vtkObjectFactory.h"
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#include "vtk_zlib.h"
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vtkCxxRevisionMacro(vtkZLibDataCompressor, "$Revision: 1.6 $");
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vtkStandardNewMacro(vtkZLibDataCompressor);
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//----------------------------------------------------------------------------
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vtkZLibDataCompressor::vtkZLibDataCompressor()
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{
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this->CompressionLevel = Z_DEFAULT_COMPRESSION;
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}
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//----------------------------------------------------------------------------
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vtkZLibDataCompressor::~vtkZLibDataCompressor()
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{
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}
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//----------------------------------------------------------------------------
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void vtkZLibDataCompressor::PrintSelf(ostream& os, vtkIndent indent)
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{
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this->Superclass::PrintSelf(os,indent);
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os << indent << "CompressionLevel: " << this->CompressionLevel << endl;
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}
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//----------------------------------------------------------------------------
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unsigned long
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vtkZLibDataCompressor::CompressBuffer(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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unsigned long compressedSize = compressionSpace;
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Bytef* cd = reinterpret_cast<Bytef*>(compressedData);
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const Bytef* ud = reinterpret_cast<const Bytef*>(uncompressedData);
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// Call zlib's compress function.
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if(compress2(cd, &compressedSize, ud, uncompressedSize, this->CompressionLevel) != Z_OK)
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{
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vtkErrorMacro("Zlib error while compressing data.");
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return 0;
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}
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return compressedSize;
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}
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//----------------------------------------------------------------------------
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unsigned long
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vtkZLibDataCompressor::UncompressBuffer(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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unsigned long decSize = uncompressedSize;
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Bytef* ud = reinterpret_cast<Bytef*>(uncompressedData);
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const Bytef* cd = reinterpret_cast<const Bytef*>(compressedData);
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// Call zlib's uncompress function.
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if(uncompress(ud, &decSize, cd, compressedSize) != Z_OK)
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{
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vtkErrorMacro("Zlib error while uncompressing data.");
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return 0;
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}
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// Make sure the output size matched that expected.
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if(decSize != uncompressedSize)
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{
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vtkErrorMacro("Decompression produced incorrect size.\n"
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"Expected " << uncompressedSize << " and got " << decSize);
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return 0;
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}
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return decSize;
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}
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//----------------------------------------------------------------------------
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unsigned long
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vtkZLibDataCompressor::GetMaximumCompressionSpace(unsigned long size)
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{
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// ZLib specifies that destination buffer must be 0.1% larger + 12 bytes.
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return size + (size+999)/1000 + 12;
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}
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