コード例 #1
0
/**
 * @ingroup DBusStringInternals
 * Unit test for DBusString.
 *
 * @todo Need to write tests for _dbus_string_copy() and
 * _dbus_string_move() moving to/from each of start/middle/end of a
 * string. Also need tests for _dbus_string_move_len ()
 * 
 * @returns #TRUE on success.
 */
dbus_bool_t
_dbus_string_test (void)
{
  DBusString str;
  DBusString other;
  int i, end;
  long v;
  double d;
  int lens[] = { 0, 1, 2, 3, 4, 5, 10, 16, 17, 18, 25, 31, 32, 33, 34, 35, 63, 64, 65, 66, 67, 68, 69, 70, 71, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136 };
  char *s;
  dbus_unichar_t ch;
  
  i = 0;
  while (i < _DBUS_N_ELEMENTS (lens))
    {
      if (!_dbus_string_init (&str))
        _dbus_assert_not_reached ("failed to init string");

      set_max_length (&str, lens[i]);
      
      test_max_len (&str, lens[i]);
      _dbus_string_free (&str);

      ++i;
    }

  /* Test shortening and setting length */
  i = 0;
  while (i < _DBUS_N_ELEMENTS (lens))
    {
      int j;
      
      if (!_dbus_string_init (&str))
        _dbus_assert_not_reached ("failed to init string");

      set_max_length (&str, lens[i]);
      
      if (!_dbus_string_set_length (&str, lens[i]))
        _dbus_assert_not_reached ("failed to set string length");

      j = lens[i];
      while (j > 0)
        {
          _dbus_assert (_dbus_string_get_length (&str) == j);
          if (j > 0)
            {
              _dbus_string_shorten (&str, 1);
              _dbus_assert (_dbus_string_get_length (&str) == (j - 1));
            }
          --j;
        }
      
      _dbus_string_free (&str);

      ++i;
    }

  /* Test equality */
  if (!_dbus_string_init (&str))
    _dbus_assert_not_reached ("oom");

  if (!_dbus_string_append (&str, "Hello World"))
    _dbus_assert_not_reached ("oom");

  _dbus_string_init_const (&other, "H");
  _dbus_assert (_dbus_string_equal_substring (&str, 0, 1, &other, 0));
  _dbus_assert (_dbus_string_equal_substring (&str, 1, 0, &other, 1));
  _dbus_string_init_const (&other, "Hello");
  _dbus_assert (_dbus_string_equal_substring (&str, 0, 5, &other, 0));
  _dbus_assert (_dbus_string_equal_substring (&str, 1, 4, &other, 1));
  _dbus_assert (_dbus_string_equal_substring (&str, 2, 3, &other, 2));
  _dbus_assert (_dbus_string_equal_substring (&str, 3, 2, &other, 3));
  _dbus_assert (_dbus_string_equal_substring (&str, 4, 1, &other, 4));
  _dbus_assert (_dbus_string_equal_substring (&str, 5, 0, &other, 5));

  _dbus_assert (_dbus_string_equal_substring (&other, 0, 5, &str, 0));
  _dbus_assert (_dbus_string_equal_substring (&other, 1, 4, &str, 1));
  _dbus_assert (_dbus_string_equal_substring (&other, 2, 3, &str, 2));
  _dbus_assert (_dbus_string_equal_substring (&other, 3, 2, &str, 3));
  _dbus_assert (_dbus_string_equal_substring (&other, 4, 1, &str, 4));
  _dbus_assert (_dbus_string_equal_substring (&other, 5, 0, &str, 5));

  
  _dbus_string_init_const (&other, "World");
  _dbus_assert (_dbus_string_equal_substring (&str, 6,  5, &other, 0));
  _dbus_assert (_dbus_string_equal_substring (&str, 7,  4, &other, 1));
  _dbus_assert (_dbus_string_equal_substring (&str, 8,  3, &other, 2));
  _dbus_assert (_dbus_string_equal_substring (&str, 9,  2, &other, 3));
  _dbus_assert (_dbus_string_equal_substring (&str, 10, 1, &other, 4));
  _dbus_assert (_dbus_string_equal_substring (&str, 11, 0, &other, 5));

  _dbus_assert (_dbus_string_equal_substring (&other, 0, 5, &str, 6));
  _dbus_assert (_dbus_string_equal_substring (&other, 1, 4, &str, 7));
  _dbus_assert (_dbus_string_equal_substring (&other, 2, 3, &str, 8));
  _dbus_assert (_dbus_string_equal_substring (&other, 3, 2, &str, 9));
  _dbus_assert (_dbus_string_equal_substring (&other, 4, 1, &str, 10));
  _dbus_assert (_dbus_string_equal_substring (&other, 5, 0, &str, 11));
  
  _dbus_string_free (&str);
  
  /* Test appending data */
  if (!_dbus_string_init (&str))
    _dbus_assert_not_reached ("failed to init string");

  i = 0;
  while (i < 10)
    {
      if (!_dbus_string_append (&str, "a"))
        _dbus_assert_not_reached ("failed to append string to string\n");

      _dbus_assert (_dbus_string_get_length (&str) == i * 2 + 1);

      if (!_dbus_string_append_byte (&str, 'b'))
        _dbus_assert_not_reached ("failed to append byte to string\n");

      _dbus_assert (_dbus_string_get_length (&str) == i * 2 + 2);
                    
      ++i;
    }

  _dbus_string_free (&str);

  /* Check steal_data */
  
  if (!_dbus_string_init (&str))
    _dbus_assert_not_reached ("failed to init string");

  if (!_dbus_string_append (&str, "Hello World"))
    _dbus_assert_not_reached ("could not append to string");

  i = _dbus_string_get_length (&str);
  
  if (!_dbus_string_steal_data (&str, &s))
    _dbus_assert_not_reached ("failed to steal data");

  _dbus_assert (_dbus_string_get_length (&str) == 0);
  _dbus_assert (((int)strlen (s)) == i);

  dbus_free (s);

  /* Check move */
  
  if (!_dbus_string_append (&str, "Hello World"))
    _dbus_assert_not_reached ("could not append to string");

  i = _dbus_string_get_length (&str);

  if (!_dbus_string_init (&other))
    _dbus_assert_not_reached ("could not init string");
  
  if (!_dbus_string_move (&str, 0, &other, 0))
    _dbus_assert_not_reached ("could not move");

  _dbus_assert (_dbus_string_get_length (&str) == 0);
  _dbus_assert (_dbus_string_get_length (&other) == i);

  if (!_dbus_string_append (&str, "Hello World"))
    _dbus_assert_not_reached ("could not append to string");
  
  if (!_dbus_string_move (&str, 0, &other, _dbus_string_get_length (&other)))
    _dbus_assert_not_reached ("could not move");

  _dbus_assert (_dbus_string_get_length (&str) == 0);
  _dbus_assert (_dbus_string_get_length (&other) == i * 2);

    if (!_dbus_string_append (&str, "Hello World"))
    _dbus_assert_not_reached ("could not append to string");
  
  if (!_dbus_string_move (&str, 0, &other, _dbus_string_get_length (&other) / 2))
    _dbus_assert_not_reached ("could not move");

  _dbus_assert (_dbus_string_get_length (&str) == 0);
  _dbus_assert (_dbus_string_get_length (&other) == i * 3);
  
  _dbus_string_free (&other);

  /* Check copy */
  
  if (!_dbus_string_append (&str, "Hello World"))
    _dbus_assert_not_reached ("could not append to string");

  i = _dbus_string_get_length (&str);
  
  if (!_dbus_string_init (&other))
    _dbus_assert_not_reached ("could not init string");
  
  if (!_dbus_string_copy (&str, 0, &other, 0))
    _dbus_assert_not_reached ("could not copy");

  _dbus_assert (_dbus_string_get_length (&str) == i);
  _dbus_assert (_dbus_string_get_length (&other) == i);

  if (!_dbus_string_copy (&str, 0, &other, _dbus_string_get_length (&other)))
    _dbus_assert_not_reached ("could not copy");

  _dbus_assert (_dbus_string_get_length (&str) == i);
  _dbus_assert (_dbus_string_get_length (&other) == i * 2);
  _dbus_assert (_dbus_string_equal_c_str (&other,
                                          "Hello WorldHello World"));

  if (!_dbus_string_copy (&str, 0, &other, _dbus_string_get_length (&other) / 2))
    _dbus_assert_not_reached ("could not copy");

  _dbus_assert (_dbus_string_get_length (&str) == i);
  _dbus_assert (_dbus_string_get_length (&other) == i * 3);
  _dbus_assert (_dbus_string_equal_c_str (&other,
                                          "Hello WorldHello WorldHello World"));
  
  _dbus_string_free (&str);
  _dbus_string_free (&other);

  /* Check replace */

  if (!_dbus_string_init (&str))
    _dbus_assert_not_reached ("failed to init string");
  
  if (!_dbus_string_append (&str, "Hello World"))
    _dbus_assert_not_reached ("could not append to string");

  i = _dbus_string_get_length (&str);
  
  if (!_dbus_string_init (&other))
    _dbus_assert_not_reached ("could not init string");
  
  if (!_dbus_string_replace_len (&str, 0, _dbus_string_get_length (&str),
                                 &other, 0, _dbus_string_get_length (&other)))
    _dbus_assert_not_reached ("could not replace");

  _dbus_assert (_dbus_string_get_length (&str) == i);
  _dbus_assert (_dbus_string_get_length (&other) == i);
  _dbus_assert (_dbus_string_equal_c_str (&other, "Hello World"));
  
  if (!_dbus_string_replace_len (&str, 0, _dbus_string_get_length (&str),
                                 &other, 5, 1))
    _dbus_assert_not_reached ("could not replace center space");

  _dbus_assert (_dbus_string_get_length (&str) == i);
  _dbus_assert (_dbus_string_get_length (&other) == i * 2 - 1);
  _dbus_assert (_dbus_string_equal_c_str (&other,
                                          "HelloHello WorldWorld"));

  
  if (!_dbus_string_replace_len (&str, 1, 1,
                                 &other,
                                 _dbus_string_get_length (&other) - 1,
                                 1))
    _dbus_assert_not_reached ("could not replace end character");
  
  _dbus_assert (_dbus_string_get_length (&str) == i);
  _dbus_assert (_dbus_string_get_length (&other) == i * 2 - 1);
  _dbus_assert (_dbus_string_equal_c_str (&other,
                                          "HelloHello WorldWorle"));
  
  _dbus_string_free (&str);
  _dbus_string_free (&other);
  
  /* Check append/get unichar */
  
  if (!_dbus_string_init (&str))
    _dbus_assert_not_reached ("failed to init string");

  ch = 0;
  if (!_dbus_string_append_unichar (&str, 0xfffc))
    _dbus_assert_not_reached ("failed to append unichar");

  _dbus_string_get_unichar (&str, 0, &ch, &i);

  _dbus_assert (ch == 0xfffc);
  _dbus_assert (i == _dbus_string_get_length (&str));

  _dbus_string_free (&str);

  /* Check insert/set/get byte */
  
  if (!_dbus_string_init (&str))
    _dbus_assert_not_reached ("failed to init string");

  if (!_dbus_string_append (&str, "Hello"))
    _dbus_assert_not_reached ("failed to append Hello");

  _dbus_assert (_dbus_string_get_byte (&str, 0) == 'H');
  _dbus_assert (_dbus_string_get_byte (&str, 1) == 'e');
  _dbus_assert (_dbus_string_get_byte (&str, 2) == 'l');
  _dbus_assert (_dbus_string_get_byte (&str, 3) == 'l');
  _dbus_assert (_dbus_string_get_byte (&str, 4) == 'o');

  _dbus_string_set_byte (&str, 1, 'q');
  _dbus_assert (_dbus_string_get_byte (&str, 1) == 'q');

  if (!_dbus_string_insert_bytes (&str, 0, 1, 255))
    _dbus_assert_not_reached ("can't insert byte");

  if (!_dbus_string_insert_bytes (&str, 2, 4, 'Z'))
    _dbus_assert_not_reached ("can't insert byte");

  if (!_dbus_string_insert_bytes (&str, _dbus_string_get_length (&str), 1, 'W'))
    _dbus_assert_not_reached ("can't insert byte");
  
  _dbus_assert (_dbus_string_get_byte (&str, 0) == 255);
  _dbus_assert (_dbus_string_get_byte (&str, 1) == 'H');
  _dbus_assert (_dbus_string_get_byte (&str, 2) == 'Z');
  _dbus_assert (_dbus_string_get_byte (&str, 3) == 'Z');
  _dbus_assert (_dbus_string_get_byte (&str, 4) == 'Z');
  _dbus_assert (_dbus_string_get_byte (&str, 5) == 'Z');
  _dbus_assert (_dbus_string_get_byte (&str, 6) == 'q');
  _dbus_assert (_dbus_string_get_byte (&str, 7) == 'l');
  _dbus_assert (_dbus_string_get_byte (&str, 8) == 'l');
  _dbus_assert (_dbus_string_get_byte (&str, 9) == 'o');
  _dbus_assert (_dbus_string_get_byte (&str, 10) == 'W');

  _dbus_string_free (&str);
  
  /* Check append/parse int/double */
  
  if (!_dbus_string_init (&str))
    _dbus_assert_not_reached ("failed to init string");

  if (!_dbus_string_append_int (&str, 27))
    _dbus_assert_not_reached ("failed to append int");

  i = _dbus_string_get_length (&str);

  if (!_dbus_string_parse_int (&str, 0, &v, &end))
    _dbus_assert_not_reached ("failed to parse int");

  _dbus_assert (v == 27);
  _dbus_assert (end == i);

  _dbus_string_free (&str);
  
  if (!_dbus_string_init (&str))
    _dbus_assert_not_reached ("failed to init string");
  
  if (!_dbus_string_append_double (&str, 50.3))
    _dbus_assert_not_reached ("failed to append float");

  i = _dbus_string_get_length (&str);

  if (!_dbus_string_parse_double (&str, 0, &d, &end))
    _dbus_assert_not_reached ("failed to parse float");

  _dbus_assert (d > (50.3 - 1e-6) && d < (50.3 + 1e-6));
  _dbus_assert (end == i);

  _dbus_string_free (&str);

  /* Test find */
  if (!_dbus_string_init (&str))
    _dbus_assert_not_reached ("failed to init string");

  if (!_dbus_string_append (&str, "Hello"))
    _dbus_assert_not_reached ("couldn't append to string");
  
  if (!_dbus_string_find (&str, 0, "He", &i))
    _dbus_assert_not_reached ("didn't find 'He'");
  _dbus_assert (i == 0);

  if (!_dbus_string_find (&str, 0, "Hello", &i))
    _dbus_assert_not_reached ("didn't find 'Hello'");
  _dbus_assert (i == 0);
  
  if (!_dbus_string_find (&str, 0, "ello", &i))
    _dbus_assert_not_reached ("didn't find 'ello'");
  _dbus_assert (i == 1);

  if (!_dbus_string_find (&str, 0, "lo", &i))
    _dbus_assert_not_reached ("didn't find 'lo'");
  _dbus_assert (i == 3);

  if (!_dbus_string_find (&str, 2, "lo", &i))
    _dbus_assert_not_reached ("didn't find 'lo'");
  _dbus_assert (i == 3);

  if (_dbus_string_find (&str, 4, "lo", &i))
    _dbus_assert_not_reached ("did find 'lo'");
  
  if (!_dbus_string_find (&str, 0, "l", &i))
    _dbus_assert_not_reached ("didn't find 'l'");
  _dbus_assert (i == 2);

  if (!_dbus_string_find (&str, 0, "H", &i))
    _dbus_assert_not_reached ("didn't find 'H'");
  _dbus_assert (i == 0);

  if (!_dbus_string_find (&str, 0, "", &i))
    _dbus_assert_not_reached ("didn't find ''");
  _dbus_assert (i == 0);
  
  if (_dbus_string_find (&str, 0, "Hello!", NULL))
    _dbus_assert_not_reached ("Did find 'Hello!'");

  if (_dbus_string_find (&str, 0, "Oh, Hello", NULL))
    _dbus_assert_not_reached ("Did find 'Oh, Hello'");
  
  if (_dbus_string_find (&str, 0, "ill", NULL))
    _dbus_assert_not_reached ("Did find 'ill'");

  if (_dbus_string_find (&str, 0, "q", NULL))
    _dbus_assert_not_reached ("Did find 'q'");

  if (!_dbus_string_find_to (&str, 0, 2, "He", NULL))
    _dbus_assert_not_reached ("Didn't find 'He'");

  if (_dbus_string_find_to (&str, 0, 2, "Hello", NULL))
    _dbus_assert_not_reached ("Did find 'Hello'");

  if (!_dbus_string_find_byte_backward (&str, _dbus_string_get_length (&str), 'H', &i))
    _dbus_assert_not_reached ("Did not find 'H'");
  _dbus_assert (i == 0);

  if (!_dbus_string_find_byte_backward (&str, _dbus_string_get_length (&str), 'o', &i))
    _dbus_assert_not_reached ("Did not find 'o'");
  _dbus_assert (i == _dbus_string_get_length (&str) - 1);

  if (_dbus_string_find_byte_backward (&str, _dbus_string_get_length (&str) - 1, 'o', &i))
    _dbus_assert_not_reached ("Did find 'o'");
  _dbus_assert (i == -1);

  if (_dbus_string_find_byte_backward (&str, 1, 'e', &i))
    _dbus_assert_not_reached ("Did find 'e'");
  _dbus_assert (i == -1);

  if (!_dbus_string_find_byte_backward (&str, 2, 'e', &i))
    _dbus_assert_not_reached ("Didn't find 'e'");
  _dbus_assert (i == 1);
  
  _dbus_string_free (&str);

  /* Hex encoding */
  _dbus_string_init_const (&str, "cafebabe, this is a bogus hex string");
  if (!_dbus_string_init (&other))
    _dbus_assert_not_reached ("could not init string");

  if (!_dbus_string_hex_decode (&str, 0, &end, &other, 0))
    _dbus_assert_not_reached ("deccoded bogus hex string with no error");

  _dbus_assert (end == 8);

  _dbus_string_free (&other);

  test_roundtrips (test_hex_roundtrip);
  
  _dbus_string_free (&str);

  {                                                                                           
    int found, found_len;  

    _dbus_string_init_const (&str, "012\r\n567\n90");
    
    if (!_dbus_string_find_eol (&str, 0, &found, &found_len) || found != 3 || found_len != 2)
      _dbus_assert_not_reached ("Did not find '\\r\\n'");                                       
    if (found != 3 || found_len != 2)                                                           
      _dbus_assert_not_reached ("invalid return values");                                       
    
    if (!_dbus_string_find_eol (&str, 5, &found, &found_len))                                    
      _dbus_assert_not_reached ("Did not find '\\n'");                                          
    if (found != 8 || found_len != 1)                                                           
      _dbus_assert_not_reached ("invalid return values");                                       
    
    if (_dbus_string_find_eol (&str, 9, &found, &found_len))                                     
      _dbus_assert_not_reached ("Found not expected '\\n'");                                    
    else if (found != 11 || found_len != 0)                                                     
      _dbus_assert_not_reached ("invalid return values '\\n'");                                 

    found = -1;
    found_len = -1;
    _dbus_string_init_const (&str, "");
    if (_dbus_string_find_eol (&str, 0, &found, &found_len))
      _dbus_assert_not_reached ("found an eol in an empty string");
    _dbus_assert (found == 0);
    _dbus_assert (found_len == 0);
    
    found = -1;
    found_len = -1;
    _dbus_string_init_const (&str, "foobar");
    if (_dbus_string_find_eol (&str, 0, &found, &found_len))
      _dbus_assert_not_reached ("found eol in string that lacks one");
    _dbus_assert (found == 6);
    _dbus_assert (found_len == 0);

    found = -1;
    found_len = -1;
    _dbus_string_init_const (&str, "foobar\n");
    if (!_dbus_string_find_eol (&str, 0, &found, &found_len))
      _dbus_assert_not_reached ("did not find eol in string that has one at end");
    _dbus_assert (found == 6);
    _dbus_assert (found_len == 1);
  }

  {
    DBusString line;

#define FIRST_LINE "this is a line"
#define SECOND_LINE "this is a second line"
    /* third line is empty */
#define THIRD_LINE ""
#define FOURTH_LINE "this is a fourth line"
    
    if (!_dbus_string_init (&str))
      _dbus_assert_not_reached ("no memory");

    if (!_dbus_string_append (&str, FIRST_LINE "\n" SECOND_LINE "\r\n" THIRD_LINE "\n" FOURTH_LINE))
      _dbus_assert_not_reached ("no memory");
    
    if (!_dbus_string_init (&line))
      _dbus_assert_not_reached ("no memory");
    
    if (!_dbus_string_pop_line (&str, &line))
      _dbus_assert_not_reached ("failed to pop first line");

    _dbus_assert (_dbus_string_equal_c_str (&line, FIRST_LINE));
    
    if (!_dbus_string_pop_line (&str, &line))
      _dbus_assert_not_reached ("failed to pop second line");

    _dbus_assert (_dbus_string_equal_c_str (&line, SECOND_LINE));
    
    if (!_dbus_string_pop_line (&str, &line))
      _dbus_assert_not_reached ("failed to pop third line");

    _dbus_assert (_dbus_string_equal_c_str (&line, THIRD_LINE));
    
    if (!_dbus_string_pop_line (&str, &line))
      _dbus_assert_not_reached ("failed to pop fourth line");

    _dbus_assert (_dbus_string_equal_c_str (&line, FOURTH_LINE));
    
    _dbus_string_free (&str);
    _dbus_string_free (&line);
  }

  {
    if (!_dbus_string_init (&str))
      _dbus_assert_not_reached ("no memory");

    for (i = 0; i < 10000; i++)
      if (!_dbus_string_append (&str, "abcdefghijklmnopqrstuvwxyz"))
        _dbus_assert_not_reached ("no memory");

    if (!_dbus_string_set_length (&str, 10))
      _dbus_assert_not_reached ("failed to set length");

    /* actually compact */
    if (!_dbus_string_compact (&str, 2048))
      _dbus_assert_not_reached ("failed to compact after set_length");

    /* peek inside to make sure it worked */
    if (((DBusRealString *)&str)->allocated > 30)
      _dbus_assert_not_reached ("compacting string didn't do anything");

    if (!_dbus_string_equal_c_str (&str, "abcdefghij"))
      _dbus_assert_not_reached ("unexpected content after compact");

    /* compact nothing */
    if (!_dbus_string_compact (&str, 2048))
      _dbus_assert_not_reached ("failed to compact 2nd time");

    if (!_dbus_string_equal_c_str (&str, "abcdefghij"))
      _dbus_assert_not_reached ("unexpected content after 2nd compact");

    /* and make sure it still works...*/
    if (!_dbus_string_append (&str, "123456"))
      _dbus_assert_not_reached ("failed to append after compact");

    if (!_dbus_string_equal_c_str (&str, "abcdefghij123456"))
      _dbus_assert_not_reached ("unexpected content after append");

    /* after growing automatically, this should do nothing */
    if (!_dbus_string_compact (&str, 20000))
      _dbus_assert_not_reached ("failed to compact after grow");

    /* but this one will do something */
    if (!_dbus_string_compact (&str, 0))
      _dbus_assert_not_reached ("failed to compact after grow");

    if (!_dbus_string_equal_c_str (&str, "abcdefghij123456"))
      _dbus_assert_not_reached ("unexpected content");

    if (!_dbus_string_append (&str, "!@#$%"))
      _dbus_assert_not_reached ("failed to append after compact");

    if (!_dbus_string_equal_c_str (&str, "abcdefghij123456!@#$%"))
      _dbus_assert_not_reached ("unexpected content");

    _dbus_string_free (&str);
  }

  {
    const char two_strings[] = "one\ttwo";

    if (!_dbus_string_init (&str))
      _dbus_assert_not_reached ("no memory");

    if (!_dbus_string_init (&other))
      _dbus_assert_not_reached ("no memory");

    if (!_dbus_string_append (&str, two_strings))
      _dbus_assert_not_reached ("no memory");

    if (!_dbus_string_split_on_byte (&str, '\t', &other))
      _dbus_assert_not_reached ("no memory or delimiter not found");

    if (strcmp (_dbus_string_get_data (&str), "one") != 0)
      _dbus_assert_not_reached ("left side after split on tab is wrong");

    if (strcmp (_dbus_string_get_data (&other), "two") != 0)
      _dbus_assert_not_reached ("right side after split on tab is wrong");

    _dbus_string_free (&str);
    _dbus_string_free (&other);
  }
  
  return TRUE;
}
コード例 #2
0
static DBusValidity
load_and_validate_field (DBusHeader     *header,
                         int             field,
                         DBusTypeReader *variant_reader)
{
  int type;
  int expected_type;
  const DBusString *value_str;
  int value_pos;
  int str_data_pos;
  dbus_uint32_t v_UINT32;
  int bad_string_code;
  dbus_bool_t (* string_validation_func) (const DBusString *str,
                                          int start, int len);

  /* Supposed to have been checked already */
  _dbus_assert (field <= DBUS_HEADER_FIELD_LAST);
  _dbus_assert (field != DBUS_HEADER_FIELD_INVALID);

  /* Before we can cache a field, we need to know it has the right type */
  type = _dbus_type_reader_get_current_type (variant_reader);

  _dbus_assert (_dbus_header_field_types[field].code == field);

  expected_type = EXPECTED_TYPE_OF_FIELD (field);
  if (type != expected_type)
    {
      _dbus_verbose ("Field %d should have type %d but has %d\n",
                     field, expected_type, type);
      return DBUS_INVALID_HEADER_FIELD_HAS_WRONG_TYPE;
    }

  /* If the field was provided twice, we aren't happy */
  if (header->fields[field].value_pos >= 0)
    {
      _dbus_verbose ("Header field %d seen a second time\n", field);
      return DBUS_INVALID_HEADER_FIELD_APPEARS_TWICE;
    }

  /* Now we can cache and look at the field content */
  _dbus_verbose ("initially caching field %d\n", field);
  _dbus_header_cache_one (header, field, variant_reader);

  string_validation_func = NULL;

  /* make compiler happy that all this is initialized */
  v_UINT32 = 0;
  value_str = NULL;
  value_pos = -1;
  str_data_pos = -1;
  bad_string_code = DBUS_VALID;

  if (expected_type == DBUS_TYPE_UINT32)
    {
      _dbus_header_get_field_basic (header, field, expected_type,
                                    &v_UINT32);
    }
  else if (expected_type == DBUS_TYPE_STRING ||
           expected_type == DBUS_TYPE_OBJECT_PATH ||
           expected_type == DBUS_TYPE_SIGNATURE)
    {
      _dbus_header_get_field_raw (header, field,
                                  &value_str, &value_pos);
      str_data_pos = _DBUS_ALIGN_VALUE (value_pos, 4) + 4;
    }
  else
    {
      _dbus_assert_not_reached ("none of the known fields should have this type");
    }

  switch (field)
    {
    case DBUS_HEADER_FIELD_DESTINATION:
      string_validation_func = _dbus_validate_bus_name;
      bad_string_code = DBUS_INVALID_BAD_DESTINATION;
      break;
    case DBUS_HEADER_FIELD_INTERFACE:
      string_validation_func = _dbus_validate_interface;
      bad_string_code = DBUS_INVALID_BAD_INTERFACE;

      if (_dbus_string_equal_substring (&_dbus_local_interface_str,
                                        0,
                                        _dbus_string_get_length (&_dbus_local_interface_str),
                                        value_str, str_data_pos))
        {
          _dbus_verbose ("Message is on the local interface\n");
          return DBUS_INVALID_USES_LOCAL_INTERFACE;
        }
      break;

    case DBUS_HEADER_FIELD_MEMBER:
      string_validation_func = _dbus_validate_member;
      bad_string_code = DBUS_INVALID_BAD_MEMBER;
      break;

    case DBUS_HEADER_FIELD_ERROR_NAME:
      string_validation_func = _dbus_validate_error_name;
      bad_string_code = DBUS_INVALID_BAD_ERROR_NAME;
      break;

    case DBUS_HEADER_FIELD_SENDER:
      string_validation_func = _dbus_validate_bus_name;
      bad_string_code = DBUS_INVALID_BAD_SENDER;
      break;

    case DBUS_HEADER_FIELD_PATH:
      /* OBJECT_PATH was validated generically due to its type */
      string_validation_func = NULL;

      if (_dbus_string_equal_substring (&_dbus_local_path_str,
                                        0,
                                        _dbus_string_get_length (&_dbus_local_path_str),
                                        value_str, str_data_pos))
        {
          _dbus_verbose ("Message is from the local path\n");
          return DBUS_INVALID_USES_LOCAL_PATH;
        }
      break;

    case DBUS_HEADER_FIELD_REPLY_SERIAL:
      /* Can't be 0 */
      if (v_UINT32 == 0)
        {
          return DBUS_INVALID_BAD_SERIAL;
        }
      break;

    case DBUS_HEADER_FIELD_SIGNATURE:
      /* SIGNATURE validated generically due to its type */
      string_validation_func = NULL;
      break;

    default:
      _dbus_assert_not_reached ("unknown field shouldn't be seen here");
      break;
    }

  if (string_validation_func)
    {
      dbus_uint32_t len;

      _dbus_assert (bad_string_code != DBUS_VALID);

      len = _dbus_marshal_read_uint32 (value_str, value_pos,
                                       header->byte_order, NULL);

#if 0
      _dbus_verbose ("Validating string header field; code %d if fails\n",
                     bad_string_code);
#endif
      if (!(*string_validation_func) (value_str, str_data_pos, len))
        return bad_string_code;
    }

  return DBUS_VALID;
}