/*=========================================================================

  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() = default;

//------------------------------------------------------------------------------
vtkDataCompressor::~vtkDataCompressor() = default;

//------------------------------------------------------------------------------
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(static_cast<vtkIdType>(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 nullptr;
  }

  // Store the actual size.
  outputArray->SetNumberOfTuples(static_cast<vtkIdType>(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(static_cast<vtkIdType>(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 nullptr;
  }

  // Store the actual size.
  outputArray->SetNumberOfTuples(static_cast<vtkIdType>(decSize));

  return outputArray;
}