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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkHashImageFilter_hxx
#define itkHashImageFilter_hxx
#include "itkHashImageFilter.h"
namespace itk {
//
// Constructor
//
template<class TImageType>
HashImageFilter<TImageType>::HashImageFilter()
{
this->m_HashFunction = MD5;
// create data object
this->ProcessObject::SetNthOutput( 1, this->MakeOutput(1).GetPointer() );
// NOTE: Turning this on causes a crash due to a bug is InPlaceImageFilter
this->InPlaceOff();
}
//
// MakeOutput
//
template<class TImageType>
typename HashImageFilter<TImageType>::DataObjectPointer
HashImageFilter<TImageType>::MakeOutput(DataObjectPointerArraySizeType idx)
{
if ( idx == 1 )
{
return static_cast< DataObject * >( HashObjectType::New().GetPointer() );
}
return Superclass::MakeOutput(idx);
}
//
// AfterThreadedGenerateData
//
template<class TImageType>
void
HashImageFilter<TImageType>::AfterThreadedGenerateData()
{
// NOTE: We have choose our super class to be the
// CastImageFilter. The filter is derived from the
// InPlaceFilter. The CastImageFilter will copy its input, in the
// best fashion based on the InPlace setting. We want the
// behavior. This methods is called after the caster has done it's
// work.
Superclass::AfterThreadedGenerateData();
typedef TImageType ImageType;
typedef typename ImageType::PixelType PixelType;
typedef typename NumericTraits<PixelType>::ValueType ValueType;
typedef itk::ByteSwapper<ValueType> Swapper;
::MD5 md5;
::HL_MD5_CTX md5Context;
md5.MD5Init ( &md5Context );
::SHA1 sha1;
::HL_SHA1_CTX sha1Context;
sha1.SHA1Reset ( &sha1Context );
typename ImageType::ConstPointer input = this->GetInput();
// make a good guess about the number of components in each pixel
size_t numberOfComponent = sizeof(PixelType) / sizeof(ValueType );
if ( strcmp(input->GetNameOfClass(), "VectorImage") == 0 )
{
// spacial case for VectorImages
numberOfComponent = ImageType::AccessorFunctorType::GetVectorLength(input);
}
else if ( sizeof(PixelType) % sizeof(ValueType) != 0 )
{
itkExceptionMacro("Unsupported data type for hashing!");
}
// we feel bad about accessing the data this way
ValueType *buffer = static_cast<ValueType*>( (void *)input->GetBufferPointer() );
typename ImageType::RegionType largestRegion = input->GetBufferedRegion();
const size_t numberOfValues = largestRegion.GetNumberOfPixels()*numberOfComponent;
// Possibly byte swap so we always calculate on little endian data
Swapper::SwapRangeFromSystemToLittleEndian ( buffer, numberOfValues );
// Update the hash
switch ( this->m_HashFunction )
{
case SHA1:
sha1.SHA1Input ( &sha1Context, (unsigned char*)buffer, numberOfValues*sizeof(ValueType) );
break;
case MD5:
md5.MD5Update ( &md5Context, (unsigned char*)buffer, numberOfValues*sizeof(ValueType) );
break;
}
// Calculate and return the hash value
std::string hash;
int HashSize = SHA1HashSize;
unsigned char Digest[1024];
switch ( this->m_HashFunction )
{
case SHA1:
{
HashSize = SHA1HashSize;
sha1.SHA1Result ( &sha1Context, Digest );
break;
}
case MD5:
{
HashSize = 16;
md5.MD5Final ( Digest, &md5Context );
break;
}
}
// Should we really covert the binary representation to a hex ASCII here
//
// Print to a string
std::ostringstream os;
for(int i=0; i<HashSize; ++i)
{
// set the width to 2, fill with 0, and convert to hex
os.width(2);
os.fill('0');
os << std::hex << static_cast<unsigned int>(Digest[i]);
}
this->GetHashOutput()->Set( os.str() );
}
//
// EnlargeOutputRequestedRegion
//
template<class TImageType>
void
HashImageFilter<TImageType>::EnlargeOutputRequestedRegion(DataObject *data)
{
Superclass::EnlargeOutputRequestedRegion(data);
// set the output region to the largest and let the pipeline
// propagate the requested region to the input
data->SetRequestedRegionToLargestPossibleRegion();
}
//
// PrintSelf
//
template<class TImageType>
void
HashImageFilter<TImageType>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "HashFunction: " << m_HashFunction << std::endl;
}
} // end namespace itk
#endif // itkHashImageFilter_hxx
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