core/vil/file_formats/vil_nitf2_scalar_field.cxx

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

#include "vil_nitf2_scalar_field.h"
#include "vil_nitf2.h"
#include "vil_nitf2_field_definition.h"
#include "vil_nitf2_field_formatter.h"
#include <vil/vil_stream_core.h>
#include <vcl_cstddef.h> // for size_t
#include <vcl_cstdlib.h>

vil_nitf2_scalar_field*
vil_nitf2_scalar_field::read(vil_nitf2_istream& input,
                             vil_nitf2_field_definition* definition,
                             int variable_width, bool* error)
{
  if (error) (*error) = false;
  if (!definition || !definition->formatter) {
    vcl_cerr << "vil_nitf2_field::read(): Incomplete field definition!\n";
    return 0;
  }
  vil_nitf2_field_formatter* formatter = definition->formatter;
  // variable_width, if positive, overrides formatter field_width
  if (variable_width > 0) formatter->field_width = variable_width;
  // Parse string
  VIL_NITF2_LOG(log_debug) << "Reading tag " << definition->tag << ": ";
  bool is_blank;
  vil_nitf2_scalar_field* result = formatter->read_field(input, is_blank);

  // Set result definition, if found, and output (for debugging):
  //   value if computed
  //   warning if required field missing (scalar field or vcl_vector element)
  //   failed message if neither of the above apply
  if (result!=0) {
    result->m_definition = definition;
    VIL_NITF2_LOG(log_debug) << *result;
  } else if (is_blank && !definition->blanks_ok) {
    VIL_NITF2_LOG(log_debug) << "required field not specified!";
    if (error) (*error) = true;
  } else if (is_blank) {
    VIL_NITF2_LOG(log_debug) << "(unspecified)";
  } else {
    VIL_NITF2_LOG(log_debug) << "failed!";
    if (error) (*error) = true;
  }
  VIL_NITF2_LOG(log_debug) << vcl_endl;
  return result;
}

bool vil_nitf2_scalar_field::write(vil_nitf2_ostream& output, int variable_width) const
{
  if (!m_definition || !m_definition->formatter) {
    vcl_cerr << "vil_nitf2_scalar_field::write(): Incomplete field definition!\n";
    return 0;
  }
  VIL_NITF2_LOG(log_debug) << "Writing tag " << m_definition->tag << ':';
  vil_nitf2_field_formatter* formatter = m_definition->formatter;
  // variable_width, if non-negative, overrides formatter's field_width
  if (variable_width > 0) formatter->field_width = variable_width;
  formatter->write_field(output, this);
  VIL_NITF2_LOG(log_debug) << vcl_endl;
  return output.ok();
}

vil_nitf2_field::field_tree* vil_nitf2_scalar_field::get_tree() const
{
  //put the normal stuff in there
  field_tree* tr = vil_nitf2_field::get_tree();
  //now grab my value and put that in there
  vil_stream_core* str = new vil_stream_core;
  write( *str );
  vil_streampos num_to_read = str->tell();
  str->seek( 0 );
  char* buffer;
  buffer = (char*)vcl_malloc( (vcl_size_t) num_to_read+1 );
  str->read( (void*)buffer, num_to_read );
  buffer[(vcl_size_t) num_to_read] = 0;
  tr->columns.push_back( vcl_string( buffer ) );
  free( buffer );
  return tr;
}