core/vil/file_formats/vil_nitf2_des.cxx

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// vil_nitf2: Written by Rob Radtke (rob@) and Harry Voorhees (hlv@) of
// Stellar Science Ltd. Co. (stellarscience.com) for
// Air Force Research Laboratory, 2005.

#include "vil_nitf2_des.h"
#include "vil_nitf2_field_definition.h"
#include "vil_nitf2_typed_field_formatter.h"


vil_nitf2_des::field_definition_map&
  vil_nitf2_des::all_definitions()
{
  class field_definition_map_t: public vil_nitf2_des::field_definition_map
  {
   public:
    ~field_definition_map_t()
    {
      for (iterator it = begin(), last = end();
           it != last; it++ )
      {
        delete it->second;
      }
    }
  };

  static field_definition_map_t field_definitions;
  return field_definitions;
}


vil_nitf2_field_definitions&
vil_nitf2_des::define(vcl_string desId )
{
  if (all_definitions().find(desId) != all_definitions().end()) {
    throw("des with that name already defined.");
  }
  vil_nitf2_field_definitions* definition = new vil_nitf2_field_definitions();
  all_definitions().insert( vcl_make_pair(desId, definition) );
  return *definition;
}

vil_nitf2_des::vil_nitf2_des( vil_nitf2_classification::file_version version, int data_width )
  : m_field_sequence1( 0 ),
    m_field_sequence2( 0 )
{
  m_field_sequence1 = new vil_nitf2_field_sequence( *create_field_definitions( version, data_width ) );
}

bool vil_nitf2_des::read(vil_stream* stream)
{
  if ( m_field_sequence1->read(*stream) ) {
    vcl_string desId;
    m_field_sequence1->get_value( "DESID", desId );
    if ( desId == "TRE_OVERFLOW" ){
      return true;
    } else {
      field_definition_map::iterator it = all_definitions().find( desId );
      if ( it != all_definitions().end() ) {
        if ( m_field_sequence2 ) delete m_field_sequence2;
        m_field_sequence2 = new vil_nitf2_field_sequence( *((*it).second) );
        return m_field_sequence2->read(*stream);
      }
    }
  }
  return true;
}

vil_nitf2_field_definitions* vil_nitf2_des::create_field_definitions( vil_nitf2_classification::file_version ver, int data_width )
{
  vil_nitf2_field_definitions* field_definitions = new vil_nitf2_field_definitions();
  add_shared_field_defs_1(field_definitions);
  vil_nitf2_classification::add_field_defs(field_definitions, ver, "I", "Image");
  add_shared_field_defs_2(field_definitions, data_width);
  return field_definitions;
}

void vil_nitf2_des::add_shared_field_defs_1( vil_nitf2_field_definitions* defs )
{
  (*defs)
    .field( "DE", "Data Extension Subheader", NITF_ENUM( 2, vil_nitf2_enum_values().value( "DE" ) ), false, 0, 0 )
    .field( "DESID", "Unique DES Type Identifier", NITF_STR( 25 ),
            false, 0, 0 )
    .field( "DESVER", "Version of the Data Definition", NITF_INT( 2, false ), false, 0, 0 );
}

void vil_nitf2_des::add_shared_field_defs_2( vil_nitf2_field_definitions* defs, int data_width )
{
  vil_nitf2_enum_values overflow_enum;
  overflow_enum.value( "UDHD", "User Defined Header Data" )
               .value( "UDID" "User Defined Image Data" )
               .value( "XHD", "Extended Header Data" )
               .value( "IXSHD", "Image Extended Subheader Data" )
               .value( "SXSHD", "Graphic Extended Subheader Data" )
               .value( "TXSHD", "Text Extended Subheader Data" );
  (*defs)
    .field( "DESOFLW", "Overflowed Header Type", NITF_ENUM( 6, overflow_enum ),
            false, 0, new vil_nitf2_field_value_one_of<vcl_string>( "DESID", "TRE_OVERFLOW" ) )
    .field( "DESITEM", "Data Item Overflowed", NITF_INT( 3, false ),
            false, 0, new vil_nitf2_field_value_one_of<vcl_string>( "DESID", "TRE_OVERFLOW" ))
    .field( "DESSHL", "Length of DES-Defined Subheader Fields", NITF_INT( 4, false ), false, 0, 0 )
    .field( "DESDATA", "DES-Defined Data Field", NITF_TRES(), false,
            new vil_nitf2_max_field_value_plus_offset_and_threshold( "DESSHL", data_width, 0, -1 ),
            new vil_nitf2_field_value_one_of<vcl_string>( "DESID", "TRE_OVERFLOW" ) )
    .end();
}

vil_nitf2_field::field_tree* vil_nitf2_des::get_tree( int i ) const
{
  vil_nitf2_field::field_tree* t = new vil_nitf2_field::field_tree;
  vcl_stringstream name_stream;
  name_stream << "Data Extension Segment";
  if ( i > 0 ) name_stream << " #" << i;
  t->columns.push_back( name_stream.str() );
  vcl_string desId;
  if ( m_field_sequence1->get_value( "DESID", desId ) ) {
    t->columns.push_back( desId );
  }
  m_field_sequence1->get_tree( t );
  if ( m_field_sequence2 ) m_field_sequence2->get_tree( t );
  return t;
}

vil_nitf2_des::~vil_nitf2_des()
{
  if ( m_field_sequence1 ) delete m_field_sequence1;
  if ( m_field_sequence2 ) delete m_field_sequence2;
}