SQLLEN get_transfer_octet_length()

in driver/utility.cc [1627:1723]

• 68 lines of code
• 38 McCabe index (conditional complexity)

SQLLEN get_transfer_octet_length(STMT *stmt, MYSQL_FIELD *field)
{
  int capint32= stmt->dbc->ds->opt_COLUMN_SIZE_S32 ? 1 : 0;
  SQLLEN length;
  /* cap at INT_MAX32 due to signed value */
  if (field->length > INT_MAX32)
    length= INT_MAX32;
  else
    length= field->length;

  switch (field->type) {
  case MYSQL_TYPE_TINY:
    return 1;

  case MYSQL_TYPE_SHORT:
    return 2;

  case MYSQL_TYPE_INT24:
    return 3;

  case MYSQL_TYPE_LONG:
    return 4;

  case MYSQL_TYPE_FLOAT:
    return 4;

  case MYSQL_TYPE_DOUBLE:
    return 8;

  case MYSQL_TYPE_NULL:
    return 1;

  case MYSQL_TYPE_LONGLONG:
    return 20;

  case MYSQL_TYPE_DATE:
    return sizeof(SQL_DATE_STRUCT);

  case MYSQL_TYPE_TIME:
    return sizeof(SQL_TIME_STRUCT);

  case MYSQL_TYPE_TIMESTAMP:
  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_NEWDATE:
    return sizeof(SQL_TIMESTAMP_STRUCT);

  case MYSQL_TYPE_YEAR:
    return 1;

  case MYSQL_TYPE_DECIMAL:
  case MYSQL_TYPE_NEWDECIMAL:
    return field->length;

  case MYSQL_TYPE_BIT:
    /*
      We treat a BIT(n) as a SQL_BIT if n == 1, otherwise we treat it
      as a SQL_BINARY, so length is (bits + 7) / 8. field->length has
      the number of bits.
    */
    return (field->length + 7) / 8;

  case MYSQL_TYPE_STRING:
    if (stmt->dbc->ds->opt_PAD_SPACE)
    {
      unsigned int csmaxlen = get_charset_maxlen(field->charsetnr);
      if (!csmaxlen)
        return SQL_NO_TOTAL;

      /*
        We need to find out the real length using the database length and
        the current mode (ANSI or UNICODE)
      */
      length= (field->max_length > field->length ? field->max_length : field->length) / csmaxlen;
      return length;
    }
    /* FALLTHROUGH */

  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:
  case MYSQL_TYPE_VARCHAR:
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
  case MYSQL_TYPE_GEOMETRY:
  case MYSQL_TYPE_JSON:
    if (field->charsetnr != stmt->dbc->ansi_charset_info->number &&
        field->charsetnr != BINARY_CHARSET_NUMBER)
      length *= stmt->dbc->ansi_charset_info->mbmaxlen;
    if (capint32 && length > INT_MAX32)
      length= INT_MAX32;
    return length;
  }

  return SQL_NO_TOTAL;
}