[Dcmlib] Known bug : VR = UN

[Jean-Pierre Roux]

Hi, gdcm users.

Just to keep a track in the ML :

Till gdcm1.2 (included),  due to a mistake in the writter, gdcm-written 
images holding a Data Element whose VR is "UN" (that's not so common),  
are bugged, and cannot be re-read, nowhere
 :-(
A quick an dirty solution is to make a temporary version of gdcm, to 
read those bugged images and rewrite them ( that will be done in a 
kosker way ).

==> in gdcmDocument.cxx, at the very begining of  FindDocEntryLength() 
method,
just commenter out the following
|| vr == "UN"
(see hereafter)

void Document::FindDocEntryLength( DocEntry *entry )
  throw ( FormatError )
{
  const VRKey &vr  = entry->GetVR();
  uint16_t length16;       
  if ( Filetype == ExplicitVR && !entry->IsImplicitVR() )
  {
     if ( vr == "OB" || vr == "OW" || vr == "SQ" || vr == "UT"
                                         /* || vr == "UN" */    )

Sorry for the trouble;

Jean-Pierre Roux