/* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#include "my_config.h"
#include <gtest/gtest.h>


#include <m_ctype.h>
#include <sql_class.h>

namespace strings_utf8_unittest {

class StringsUTF8Test : public ::testing::Test
{
protected:
  virtual void SetUp()
  {
    // Save global settings.
    m_charset= system_charset_info;

    system_charset_info= &my_charset_utf8_bin;
  }

  virtual void TearDown()
  {
    // Restore global settings.
    system_charset_info= m_charset;
  }

private:
  CHARSET_INFO *m_charset;
};

TEST_F(StringsUTF8Test, MyStrchr)
{
  const char* null_pos= NULL;
  char* pos;
  char valid_utf8_string[]= "str1";

  /*
    All valid utf8 characters in str arg passed to  my_strchr and  char to be
    found not in str.
  */

  pos= my_strchr(system_charset_info, valid_utf8_string,
                 valid_utf8_string + 3, 't');

  EXPECT_EQ(valid_utf8_string + 1, pos);

  /*
    All valid utf8 characters in str arg passed to  my_strchr and  char to be
    found not in str.
  */
  pos= my_strchr(system_charset_info, valid_utf8_string,
                 valid_utf8_string + 3, 'd');

  ASSERT_EQ(null_pos, pos);

  // Assign an invalid utf8 char to valid_utf8_str
  valid_utf8_string[0]= '\xff';

  // Invalid utf8 character in str arg passed to my_strchr.
  pos= my_strchr(system_charset_info, valid_utf8_string,
                 valid_utf8_string + 3,'y');
  ASSERT_EQ(null_pos, pos);

}

TEST_F(StringsUTF8Test, MyStrcasecmpMb)
{
  std::string utf8_src= "str";
  std::string utf8_dst= "str";

  EXPECT_EQ(0, my_strcasecmp_mb(system_charset_info, utf8_src.c_str(),
                                utf8_dst.c_str()));

  utf8_dst[1]= 'd';
  
  // src and dst are different utf8 strings
  EXPECT_EQ(1, my_strcasecmp_mb(system_charset_info, utf8_src.c_str(),
                                utf8_dst.c_str()));

  // dst contain an invalid utf8 string
  utf8_dst[1]= '\xFF';
  EXPECT_EQ(1, my_strcasecmp_mb(system_charset_info, utf8_src.c_str(),
                                utf8_dst.c_str()));
}

TEST_F(StringsUTF8Test, MyWellFormedLenUtf8)
{
  char utf8_src[32]= "\x00\x7f\xc2\x80\xdf\xbf\xe0\xa0\x80\xef\xbf\xbf";
  int error;
  
  /* valid utf8 charaters, testing for boundry values */
  EXPECT_EQ(12U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                            utf8_src,
                                                            utf8_src + 12,
                                                            6, &error));
  ASSERT_EQ(0, error);

  /* test for 0 length string */
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src,
                                                           6, &error));
  ASSERT_EQ(0, error);

  /* test for illegal utf8 char */
  utf8_src[0]= '\xc1';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 1,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xdf';
  utf8_src[1]= '\x00';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 2,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xe0';
  utf8_src[1]= '\xbf';
  utf8_src[2]= '\x00';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 3,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xe0';
  utf8_src[1]= '\x80';
  utf8_src[2]= '\x80';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 3,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xf0';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 1,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xc2';
  utf8_src[1]= '\x80';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 1,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xef';
  utf8_src[1]= '\xbf';
  utf8_src[2]= '\xbf';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 2,
                                                           1, &error));
  ASSERT_EQ(1, error);
}

TEST_F(StringsUTF8Test, MyIsmbcharUtf8)
{
  char utf8_src[8];

  /* valid utf8 charaters, testing for boundry values */
  utf8_src[0]= '\x00';
  EXPECT_EQ(0U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 1));

  utf8_src[0]= '\x7f';
  EXPECT_EQ(0U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 1));

  utf8_src[0]= '\xc2';
  utf8_src[1]= '\x80';
  EXPECT_EQ(2U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 2));

  utf8_src[0]= '\xdf';
  utf8_src[1]= '\xbf';
  EXPECT_EQ(2U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 2));

  utf8_src[0]= '\xe0';
  utf8_src[1]= '\xa0';
  utf8_src[2]= '\x80';
  EXPECT_EQ(3U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 3));

  utf8_src[0]= '\xef';
  utf8_src[1]= '\xbf';
  utf8_src[2]= '\xbf';
  EXPECT_EQ(3U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 3));

  /* Not testing for illegal charaters as same is tested in above test case */

}

class StringsUTF8mb4Test : public ::testing::Test
{
protected:
  virtual void SetUp()
  {
    // Save global settings.
    m_charset= system_charset_info;

    system_charset_info= &my_charset_utf8mb4_bin;
  }

  virtual void TearDown()
  {
    // Restore global settings.
    system_charset_info= m_charset;
  }

private:
  CHARSET_INFO *m_charset;
};

TEST_F(StringsUTF8mb4Test, MyWellFormedLenUtf8mb4)
{
  char utf8_src[32]= "\x00\x7f\xc2\x80\xdf\xbf\xe0\xa0\x80\xef\xbf\xbf"
                     "\xf0\x90\x80\x80\xF4\x8F\xBF\xBF";
  int error;

  /* valid utf8mb4 charaters, testing for boundry values */
  EXPECT_EQ(20U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                            utf8_src,
                                                            utf8_src + 20,
                                                            8, &error));
  ASSERT_EQ(0, error);

  /* test for 0 length string */
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src, utf8_src,
                                                           8, &error));
  ASSERT_EQ(0, error);

  /* test for illegal utf8mb4 char */
  utf8_src[0]= '\xc1';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 1,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xdf';
  utf8_src[1]= '\x00';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 2,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xe0';
  utf8_src[1]= '\xbf';
  utf8_src[2]= '\x00';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 3,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xe0';
  utf8_src[1]= '\x80';
  utf8_src[2]= '\x80';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 3,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xe0';
  utf8_src[1]= '\xbf';
  utf8_src[2]= '\x00';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 3,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xf0';
  utf8_src[1]= '\x80';
  utf8_src[2]= '\x80';
  utf8_src[3]= '\x80';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 4,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xf4';
  utf8_src[1]= '\x9f';
  utf8_src[2]= '\x80';
  utf8_src[3]= '\x80';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 4,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xf0';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 1,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xc2';
  utf8_src[1]= '\x80';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 1,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xef';
  utf8_src[1]= '\xbf';
  utf8_src[2]= '\xbf';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 2,
                                                           1, &error));
  ASSERT_EQ(1, error);

  utf8_src[0]= '\xf4';
  utf8_src[1]= '\x8f';
  utf8_src[2]= '\xbf';
  utf8_src[3]= '\xbf';
  EXPECT_EQ(0U, system_charset_info->cset->well_formed_len(system_charset_info,
                                                           utf8_src,
                                                           utf8_src + 2,
                                                           1, &error));
  ASSERT_EQ(1, error);
}

TEST_F(StringsUTF8mb4Test, MyIsmbcharUtf8mb4)
{
  char utf8_src[8];

  /* valid utf8mb4 charaters, testing for boundry values */
  utf8_src[0]= '\x00';
  EXPECT_EQ(0U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src,utf8_src + 1));
  utf8_src[0]= '\x7f';
  EXPECT_EQ(0U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 1));
  utf8_src[0]= '\xc2';
  utf8_src[1]= '\x80';
  EXPECT_EQ(2U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 2));
  utf8_src[0]= '\xdf';
  utf8_src[1]= '\xbf';
  EXPECT_EQ(2U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 2));
  utf8_src[0]= '\xe0';
  utf8_src[1]= '\xa0';
  utf8_src[2]= '\x80';
  EXPECT_EQ(3U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 3));
  utf8_src[0]= '\xef';
  utf8_src[1]= '\xbf';
  utf8_src[2]= '\xbf';
  EXPECT_EQ(3U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 3));
  utf8_src[0]= '\xf0';
  utf8_src[1]= '\x90';
  utf8_src[2]= '\x80';
  utf8_src[3]= '\x80';
  EXPECT_EQ(4U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 4));
  utf8_src[0]= '\xf4';
  utf8_src[1]= '\x8f';
  utf8_src[2]= '\xbf';
  utf8_src[3]= '\xbf';
  EXPECT_EQ(4U, system_charset_info->cset->ismbchar(system_charset_info,
                                                    utf8_src, utf8_src + 4));

  /* Not testing for illegal charaters as same is tested in above test case */
}

}
