core/vil/file_formats/vil_nitf2_field_formatter.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_field_formatter.h"
#include "vil_nitf2_field.h"

// not used? #include <vcl_iomanip.h>
#include <vcl_iostream.h>
#include <vcl_cstring.h> // for std::strlen()

//==============================================================================
// Class vil_nitf2_field_formatter

char* vil_nitf2_field_formatter::read_char_array(vcl_istream& input, int size)
{
  char* char_array = new char[size+1];
  input.read(char_array, size);
  char_array[input.gcount()]='\0';
  return char_array;
}

vcl_string vil_nitf2_field_formatter::read_string(vcl_istream& input, int size)
{
  char* cstr = read_char_array(input, size);
  vcl_string str = vcl_string(cstr);
  delete[] cstr;
  return str;
}

vcl_string vil_nitf2_field_formatter::read_string(vil_stream& input, int size)
{
  char* char_array = new char[size+1];
  vil_streampos pos = input.read(char_array, size);
  char_array[pos]='\0';
  vcl_string retVal(char_array);
  delete[] char_array;
  return retVal;
}

bool vil_nitf2_field_formatter::read_c_str(vcl_istream& input, int length,
                                           char*& out_cstr, bool& all_blank)
{
  out_cstr = read_char_array(input, length);
  all_blank = is_all_blank(out_cstr);
  return int(vcl_strlen(out_cstr)) == length;
}

bool vil_nitf2_field_formatter::write_blank(vcl_ostream& output)
{
  vcl_string str(field_width,' ');
  output << str;
  return !output.fail();
}

bool vil_nitf2_field_formatter::write_blank(vil_nitf2_ostream& output)
{
  vcl_string str(field_width, ' ');
  output.write(str.c_str(), field_width);
  return output.ok();
}

bool vil_nitf2_field_formatter::is_all_blank(const char* cstr)
{
  while (*cstr != '\0') {
    if (*cstr != ' ') return false;
    ++cstr;
  }
  return true;
}

bool vil_nitf2_field_formatter::check_sign(const char* cstr, bool show_sign)
{
 return
   cstr &&
   ((!show_sign && cstr[0] != '+' && cstr[0] != '-') ||
    (show_sign && (cstr[0] == '+' || cstr[0] == '-'))  );
}