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/*=========================================================================
Program: GDCM (Grassroots DICOM). A DICOM library
Copyright (c) 2006-2011 Mathieu Malaterre
All rights reserved.
See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html 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 "gdcmUNExplicitDataElement.h"
#include "gdcmSequenceOfItems.h"
#include "gdcmSequenceOfFragments.h"
namespace gdcm
{
//-----------------------------------------------------------------------------
VL UNExplicitDataElement::GetLength() const
{
if( ValueLengthField.IsUndefined() )
{
gdcm_assert( ValueField->GetLength().IsUndefined() );
Value *p = ValueField;
// If this is a SQ we need to compute it's proper length
SequenceOfItems *sq = dynamic_cast<SequenceOfItems*>(p);
// TODO can factor the code:
if( sq )
{
return TagField.GetLength() + VRField.GetLength() +
ValueLengthField.GetLength() + sq->ComputeLength<UNExplicitDataElement>();
}
SequenceOfFragments *sf = dynamic_cast<SequenceOfFragments*>(p);
if( sf )
{
gdcm_assert( VRField & (VR::OB | VR::OW) );
return TagField.GetLength() + VRField.GetLength()
+ ValueLengthField.GetLength() + sf->ComputeLength();
}
gdcm_assert(0);
return 0;
}
else
{
// Each time VR::GetLength() is 2 then Value Length is coded in 2
// 4 then Value Length is coded in 4
gdcm_assert( !ValueField || ValueField->GetLength() == ValueLengthField );
return TagField.GetLength() + 2*VRField.GetLength() + ValueLengthField;
}
}
} // end namespace gdcm