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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 "gdcmDataElement.h"
#include "gdcmByteValue.h"
#include "gdcmAttribute.h"
#include "gdcmSequenceOfFragments.h"
#include "gdcmSequenceOfItems.h"
#include "gdcmImplicitDataElement.h"
#include "gdcmTrace.h"
namespace gdcm_ns
{
void DataElement::SetVLToUndefined() {
gdcm_assert( VRField == VR::SQ || VRField == VR::INVALID
|| (VRField == VR::UN /*&& IsUndefinedLength()*/ ) );
SequenceOfItems *sqi = dynamic_cast<SequenceOfItems*>(ValueField.GetPointer());
if( sqi )
{
sqi->SetLengthToUndefined();
gdcm_assert( GetValueAsSQ()->IsUndefinedLength() );
}
ValueLengthField.SetToUndefined();
}
const SequenceOfFragments* DataElement::GetSequenceOfFragments() const {
const SequenceOfFragments *sqf = dynamic_cast<SequenceOfFragments*>(ValueField.GetPointer());
return sqf;
}
SequenceOfFragments* DataElement::GetSequenceOfFragments() {
SequenceOfFragments *sqf = dynamic_cast<SequenceOfFragments*>(ValueField.GetPointer());
return sqf;
}
/*
* Two cases are handled:
* - Simple ones:
* Explicit file with VR::SQ (defined or undefined length)
* Implicit file with undefined length (clearly a SQ)
* - If not in the previous case then we are in the second case: complex one (hidden SQ)
* Implicit file with defined length SQ
* Explicit file with SQ declared as UN + undefined length
*/
SmartPointer<SequenceOfItems> DataElement::GetValueAsSQ() const
{
if( IsEmpty() /*|| GetByteValue()*/ || GetSequenceOfFragments() )
{
return nullptr;
}
SequenceOfItems *sq = dynamic_cast<SequenceOfItems*>(ValueField.GetPointer());
if( sq ) // all set !
{
//gdcm_assert( GetVR() == VR::SQ );
SmartPointer<SequenceOfItems> sqi = sq;
return sqi;
}
const Tag itemStart(0xfffe, 0xe000);
{
{
if( GetVR() == VR::INVALID )
{
const ByteValue *bv = GetByteValue();
gdcm_assert( bv );
SequenceOfItems *sqi = new SequenceOfItems;
sqi->SetLength( bv->GetLength() );
std::string s( bv->GetPointer(), bv->GetLength() );
try
{
std::stringstream ss;
ss.str( s );
sqi->Read<ImplicitDataElement,SwapperNoOp>( ss, true );
}
catch(Exception &ex)
{
const Tag itemPMSStart(0xfeff, 0x00e0);
const Tag itemPMSStart2(0x3f3f, 0x3f00);
// same player ...
//this to fix a broken dicom implementation
//for philips medical systems
std::stringstream ss;
ss.str(s);
Tag item;
item.Read<SwapperNoOp>(ss);
if( item == itemPMSStart )
{
ss.seekg(-4,std::ios::cur);
sqi->Read<ExplicitDataElement,SwapperDoOp>( ss, true );
gdcmWarningMacro(ex.what());
(void)ex; //to avoid unreferenced variable warning on release
}
else
{
delete sqi;
sqi = nullptr;
}
}
return sqi;
}
else if ( GetVR() == VR::UN ) // cp 246, IVRLE SQ
{
gdcm_assert( GetVR() == VR::UN ); // cp 246, IVRLE SQ
const ByteValue *bv = GetByteValue();
gdcm_assert( bv );
SequenceOfItems *sqi = new SequenceOfItems;
sqi->SetLength( bv->GetLength() );
std::string s( bv->GetPointer(), bv->GetLength() );
try
{
std::stringstream ss;
ss.str( s );
sqi->Read<ImplicitDataElement,SwapperNoOp>( ss, true );
}
catch ( Exception &ex0 )
{
// Some people like to skew things up and write invalid SQ in VR:UN field
// if conversion fails, simply keep the binary VR:UN stuff as-is
// eg. AMIInvalidPrivateDefinedLengthSQasUN.dcm
//const char *s = e.what();
// s -> gdcm::ImplicitDataElement -> Impossible (more)
try
{
std::stringstream ss;
ss.str(s);
sqi->Read<ExplicitDataElement,SwapperDoOp>( ss, true );
gdcmWarningMacro(ex0.what()); (void)ex0;
}
catch ( Exception &ex1 )
{
// Let's try again this time but without the byte swapping option:
// eg. MEDILABInvalidCP246_EVRLESQasUN.dcm
try
{
std::stringstream ss;
ss.str(s);
sqi->Read<ExplicitDataElement,SwapperNoOp>( ss, true );
gdcmWarningMacro(ex1.what()); (void)ex1;
}
catch ( Exception &ex2 )
{
gdcmErrorMacro( "Could not read SQ. Giving up" );
gdcmErrorMacro(ex2.what()); (void)ex2;
delete sqi;
return nullptr;
}
}
catch ( ... )
{
gdcmErrorMacro( "Could not read SQ, unknown exception" );
delete sqi;
return nullptr;
}
}
return sqi;
}
else if ( GetVR() & VR::OB_OW ) // pre-dicom 1993 ?
{
const ByteValue *bv = GetByteValue();
gdcm_assert( bv );
SequenceOfItems *sqi = new SequenceOfItems;
sqi->SetLength( bv->GetLength() );
std::string s( bv->GetPointer(), bv->GetLength() );
try
{
std::stringstream ss;
ss.str( s );
sqi->Read<ImplicitDataElement,SwapperNoOp>( ss, true );
}
catch ( Exception &ex0 )
{
gdcmErrorMacro( "Could not read SQ as OB. Giving up" );
gdcmErrorMacro(ex0.what()); (void)ex0;
delete sqi;
return nullptr;
}
return sqi;
}
else
{
gdcm_assert( GetVR().IsVRFile() );
gdcm_assert( GetByteValue() );
return nullptr;
}
}
}
// catch( ParseException &pex )
// {
// gdcmDebugMacro( pex.what() );
// }
// catch( Exception &ex )
// {
// gdcmDebugMacro( ex.what() );
// }
// catch( ... )
// {
// gdcmWarningMacro( "Unknown exception" );
// }
}
void DataElement::SetValueFieldLength( VL vl, bool readvalues )
{
if( readvalues )
ValueField->SetLength(vl); // perform realloc
else
ValueField->SetLengthOnly(vl); // do not perform realloc
}
} // end namespace gdcm_ns