/* Copyright (c) 2002, 2016, 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 as published by
   the Free Software Foundation; version 2 of the License.

   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 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_global.h>
#include "m_ctype.h"
#include "m_string.h"


size_t my_caseup_str_mb(const CHARSET_INFO *cs, char *str)
{
  uint32 l;
  const uchar *map= cs->to_upper;
  char *str_orig= str;

  while (*str)
  {
    /* Pointing after the '\0' is safe here. */
    if ((l= my_ismbchar(cs, str, str + cs->mbmaxlen)))
      str+= l;
    else
    { 
      *str= (char) map[(uchar)*str];
      str++;
    }
  }
  return (size_t) (str - str_orig);
}


size_t my_casedn_str_mb(const CHARSET_INFO *cs, char *str)
{
  uint32 l;
  const uchar *map= cs->to_lower;
  char *str_orig= str;

  while (*str)
  {
    /* Pointing after the '\0' is safe here. */
    if ((l= my_ismbchar(cs, str, str + cs->mbmaxlen)))
      str+= l;
    else
    {
      *str= (char) map[(uchar)*str];
      str++;
    }
  }
  return (size_t) (str - str_orig);
}


static inline const MY_UNICASE_CHARACTER*
get_case_info_for_ch(const CHARSET_INFO *cs, uint page, uint offs)
{
  const MY_UNICASE_CHARACTER *p;
  return cs->caseinfo ? ((p= cs->caseinfo->page[page]) ? &p[offs] : NULL) :  NULL;
}


/*
  For character sets which don't change octet length in case conversion.
*/
size_t my_caseup_mb(const CHARSET_INFO *cs, char *src, size_t srclen,
                    char *dst MY_ATTRIBUTE((unused)),
                    size_t dstlen MY_ATTRIBUTE((unused)))
{
  uint32 l;
  char *srcend= src + srclen;
  const uchar *map= cs->to_upper;

  DBUG_ASSERT(cs->caseup_multiply == 1);
  DBUG_ASSERT(src == dst && srclen == dstlen);
  DBUG_ASSERT(cs->mbmaxlen == 2);

  while (src < srcend)
  {
    if ((l=my_ismbchar(cs, src, srcend)))
    {
      const MY_UNICASE_CHARACTER *ch;
      if ((ch= get_case_info_for_ch(cs, (uchar) src[0], (uchar) src[1])))
      {
        *src++= ch->toupper >> 8;
        *src++= ch->toupper & 0xFF;
      }
      else
        src+= l;
    }
    else 
    {
      *src=(char) map[(uchar) *src];
      src++;
    }
  }
  return srclen;
}


size_t my_casedn_mb(const CHARSET_INFO *cs, char *src, size_t srclen,
                    char *dst MY_ATTRIBUTE((unused)),
                    size_t dstlen MY_ATTRIBUTE((unused)))
{
  uint32 l;
  char *srcend= src + srclen;
  const uchar *map=cs->to_lower;

  DBUG_ASSERT(cs->casedn_multiply == 1);
  DBUG_ASSERT(src == dst && srclen == dstlen);
  DBUG_ASSERT(cs->mbmaxlen == 2);

  while (src < srcend)
  {
    if ((l= my_ismbchar(cs, src, srcend)))
    {
      const MY_UNICASE_CHARACTER *ch;
      if ((ch= get_case_info_for_ch(cs, (uchar) src[0], (uchar) src[1])))
      {
        *src++= ch->tolower >> 8;
        *src++= ch->tolower & 0xFF;
      }
      else
        src+= l;
    }
    else
    {
      *src= (char) map[(uchar)*src];
      src++;
    }
  }
  return srclen;
}


/*
  Case folding functions for character set
  where case conversion can change string octet length.
  For example, in EUCKR,
    _euckr 0xA9A5 == "LATIN LETTER DOTLESS I" (Turkish letter)
  is upper-cased to to
    _euckr 0x49 "LATIN CAPITAL LETTER I"  ('usual' letter I)
  Length is reduced in this example from two bytes to one byte.
*/
static size_t
my_casefold_mb_varlen(const CHARSET_INFO *cs,
                      char *src, size_t srclen,
                      char *dst, size_t dstlen MY_ATTRIBUTE((unused)),
                      const uchar *map,
                      size_t is_upper)
{
  char *srcend= src + srclen, *dst0= dst;

  DBUG_ASSERT(cs->mbmaxlen == 2);

  while (src < srcend)
  {
    size_t mblen= my_ismbchar(cs, src, srcend);
    if (mblen)
    {
      const MY_UNICASE_CHARACTER *ch;
      if ((ch= get_case_info_for_ch(cs, (uchar) src[0], (uchar) src[1])))
      {
        int code= is_upper ? ch->toupper : ch->tolower;
        src+= 2;
        if (code > 0xFF)
          *dst++= code >> 8;
        *dst++= code & 0xFF;
      }
      else
      {
        *dst++= *src++;
        *dst++= *src++;
      }
    }
    else
    {
      *dst++= (char) map[(uchar) *src++];
    }
  }
  return (size_t) (dst - dst0);
}


size_t
my_casedn_mb_varlen(const CHARSET_INFO *cs, char *src, size_t srclen,
                    char *dst, size_t dstlen)
{
  DBUG_ASSERT(dstlen >= srclen * cs->casedn_multiply); 
  DBUG_ASSERT(src != dst || cs->casedn_multiply == 1);
  return my_casefold_mb_varlen(cs, src, srclen, dst, dstlen, cs->to_lower, 0);
}


size_t
my_caseup_mb_varlen(const CHARSET_INFO *cs, char *src, size_t srclen,
                    char *dst, size_t dstlen)
{
  DBUG_ASSERT(dstlen >= srclen * cs->caseup_multiply);
  DBUG_ASSERT(src != dst || cs->caseup_multiply == 1);
  return my_casefold_mb_varlen(cs, src, srclen, dst, dstlen, cs->to_upper, 1);
}


/*
  my_strcasecmp_mb() returns 0 if strings are equal, non-zero otherwise.
 */

int my_strcasecmp_mb(const CHARSET_INFO *cs,const char *s, const char *t)
{
  uint32 l;
  const uchar *map=cs->to_upper;

  while (*s && *t)
  {
    /* Pointing after the '\0' is safe here. */
    if ((l=my_ismbchar(cs, s, s + cs->mbmaxlen)))
    {
      while (l--)
        if (*s++ != *t++)
          return 1;
    }
    else if (my_mbcharlen(cs, *t) != 1 ||
             map[(uchar) *s++] != map[(uchar) *t++])
      return 1;
  }
  /* At least one of '*s' and '*t' is zero here. */
  DBUG_ASSERT(!*t || !*s);
  return (*t != *s);
}


/*
** Compare string against string with wildcard
**	0 if matched
**	-1 if not matched with wildcard
**	 1 if matched with wildcard
*/

#define INC_PTR(cs,A,B) A+=(my_ismbchar(cs,A,B) ? my_ismbchar(cs,A,B) : 1)

#define likeconv(s,A) (uchar) (s)->sort_order[(uchar) (A)]

static
int my_wildcmp_mb_impl(const CHARSET_INFO *cs,
                       const char *str,const char *str_end,
                       const char *wildstr,const char *wildend,
                       int escape, int w_one, int w_many, int recurse_level)
{
  int result= -1;				/* Not found, using wildcards */

  if (my_string_stack_guard && my_string_stack_guard(recurse_level))
     return 1;
  while (wildstr != wildend)
  {
    while (*wildstr != w_many && *wildstr != w_one)
    {
      int l;
      if (*wildstr == escape && wildstr+1 != wildend)
	wildstr++;
      if ((l = my_ismbchar(cs, wildstr, wildend)))
      {
	  if (str+l > str_end || memcmp(str, wildstr, l) != 0)
	      return 1;
	  str += l;
	  wildstr += l;
      }
      else
      if (str == str_end || likeconv(cs,*wildstr++) != likeconv(cs,*str++))
	return(1);				/* No match */
      if (wildstr == wildend)
	return (str != str_end);		/* Match if both are at end */
      result=1;					/* Found an anchor char */
    }
    if (*wildstr == w_one)
    {
      do
      {
	if (str == str_end)			/* Skip one char if possible */
	  return (result);
	INC_PTR(cs,str,str_end);
      } while (++wildstr < wildend && *wildstr == w_one);
      if (wildstr == wildend)
	break;
    }
    if (*wildstr == w_many)
    {						/* Found w_many */
      uchar cmp;
      const char* mb = wildstr;
      int mb_len=0;
      
      wildstr++;
      /* Remove any '%' and '_' from the wild search string */
      for (; wildstr != wildend ; wildstr++)
      {
	if (*wildstr == w_many)
	  continue;
	if (*wildstr == w_one)
	{
	  if (str == str_end)
	    return (-1);
	  INC_PTR(cs,str,str_end);
	  continue;
	}
	break;					/* Not a wild character */
      }
      if (wildstr == wildend)
	return(0);				/* Ok if w_many is last */
      if (str == str_end)
	return -1;
      
      if ((cmp= *wildstr) == escape && wildstr+1 != wildend)
	cmp= *++wildstr;
	
      mb=wildstr;
      mb_len= my_ismbchar(cs, wildstr, wildend);
      INC_PTR(cs,wildstr,wildend);		/* This is compared trough cmp */
      cmp=likeconv(cs,cmp);   
      do
      {
        for (;;)
        {
          if (str >= str_end)
            return -1;
          if (mb_len)
          {
            if (str+mb_len <= str_end && memcmp(str, mb, mb_len) == 0)
            {
              str += mb_len;
              break;
            }
          }
          else if (!my_ismbchar(cs, str, str_end) &&
                   likeconv(cs,*str) == cmp)
          {
            str++;
            break;
          }
          INC_PTR(cs,str, str_end);
        }
	{
	  int tmp=my_wildcmp_mb_impl(cs,str,str_end,
                                     wildstr,wildend,escape,w_one,
                                     w_many, recurse_level + 1);
	  if (tmp <= 0)
	    return (tmp);
	}
      } while (str != str_end && wildstr[0] != w_many);
      return(-1);
    }
  }
  return (str != str_end ? 1 : 0);
}

int my_wildcmp_mb(const CHARSET_INFO *cs,
                  const char *str,const char *str_end,
                  const char *wildstr,const char *wildend,
                  int escape, int w_one, int w_many)
{
  return my_wildcmp_mb_impl(cs, str, str_end,
                            wildstr, wildend,
                            escape, w_one, w_many, 1);
}


size_t my_numchars_mb(const CHARSET_INFO *cs MY_ATTRIBUTE((unused)),
		      const char *pos, const char *end)
{
  size_t count= 0;
  while (pos < end) 
  {
    uint mb_len;
    pos+= (mb_len= my_ismbchar(cs,pos,end)) ? mb_len : 1;
    count++;
  }
  return count;
}


size_t my_charpos_mb(const CHARSET_INFO *cs MY_ATTRIBUTE((unused)),
		     const char *pos, const char *end, size_t length)
{
  const char *start= pos;
  
  while (length && pos < end)
  {
    uint mb_len;
    pos+= (mb_len= my_ismbchar(cs, pos, end)) ? mb_len : 1;
    length--;
  }
  return (size_t) (length ? end+2-start : pos-start);
}


size_t my_well_formed_len_mb(const CHARSET_INFO *cs, const char *b,
                             const char *e, size_t pos, int *error)
{
  const char *b_start= b;
  *error= 0;
  while (pos)
  {
    my_wc_t wc;
    int mb_len;

    if ((mb_len= cs->cset->mb_wc(cs, &wc, (uchar*) b, (uchar*) e)) <= 0)
    {
      *error= b < e ? 1 : 0;
      break;
    }
    b+= mb_len;
    pos--;
  }
  return (size_t) (b - b_start);
}


uint my_instr_mb(const CHARSET_INFO *cs,
                 const char *b, size_t b_length, 
                 const char *s, size_t s_length,
                 my_match_t *match, uint nmatch)
{
  const char *end, *b0;
  int res= 0;
  
  if (s_length <= b_length)
  {
    if (!s_length)
    {
      if (nmatch)
      {
        match->beg= 0;
        match->end= 0;
        match->mb_len= 0;
      }
      return 1;		/* Empty string is always found */
    }
    
    b0= b;
    end= b+b_length-s_length+1;
    
    while (b < end)
    {
      int mb_len;
      
      if (!cs->coll->strnncoll(cs, (uchar*) b,   s_length, 
      				   (uchar*) s, s_length, 0))
      {
        if (nmatch)
        {
          match[0].beg= 0;
          match[0].end= (uint) (b-b0);
          match[0].mb_len= res;
          if (nmatch > 1)
          {
            match[1].beg= match[0].end;
            match[1].end= match[0].end + (uint)s_length;
            match[1].mb_len= 0;	/* Not computed */
          }
        }
        return 2;
      }
      mb_len= (mb_len= my_ismbchar(cs, b, end)) ? mb_len : 1;
      b+= mb_len;
      b_length-= mb_len;
      res++;
    }
  }
  return 0;
}


/* BINARY collations handlers for MB charsets */

int
my_strnncoll_mb_bin(const CHARSET_INFO *cs MY_ATTRIBUTE((unused)),
                    const uchar *s, size_t slen,
                    const uchar *t, size_t tlen,
                    my_bool t_is_prefix)
{
  size_t len= MY_MIN(slen,tlen);
  int cmp= memcmp(s,t,len);
  return cmp ? cmp : (int) ((t_is_prefix ? len : slen) - tlen);
}


/*
  Compare two strings. 
  
  SYNOPSIS
    my_strnncollsp_mb_bin()
    cs			Chararacter set
    s			String to compare
    slen		Length of 's'
    t			String to compare
    tlen		Length of 't'
    diff_if_only_endspace_difference
		        Set to 1 if the strings should be regarded as different
                        if they only difference in end space

  NOTE
   This function is used for character strings with binary collations.
   The shorter string is extended with end space to be as long as the longer
   one.

  RETURN
    A negative number if s < t
    A positive number if s > t
    0 if strings are equal
*/

int
my_strnncollsp_mb_bin(const CHARSET_INFO *cs MY_ATTRIBUTE((unused)),
                      const uchar *a, size_t a_length, 
                      const uchar *b, size_t b_length,
                      my_bool diff_if_only_endspace_difference)
{
  const uchar *end;
  size_t length;
  int res;

#ifndef VARCHAR_WITH_DIFF_ENDSPACE_ARE_DIFFERENT_FOR_UNIQUE
  diff_if_only_endspace_difference= 0;
#endif
  
  end= a + (length= MY_MIN(a_length, b_length));
  while (a < end)
  {
    if (*a++ != *b++)
      return ((int) a[-1] - (int) b[-1]);
  }
  res= 0;
  if (a_length != b_length)
  {
    int swap= 1;
    if (diff_if_only_endspace_difference)
      res= 1;                                   /* Assume 'a' is bigger */
    /*
      Check the next not space character of the longer key. If it's < ' ',
      then it's smaller than the other key.
    */
    if (a_length < b_length)
    {
      /* put shorter key in s */
      a_length= b_length;
      a= b;
      swap= -1;					/* swap sign of result */
      res= -res;
    }
    for (end= a + a_length-length; a < end ; a++)
    {
      if (*a != ' ')
	return (*a < ' ') ? -swap : swap;
    }
  }
  return res;
}


/*
  Copy one non-ascii character.
  "dst" must have enough room for the character.
  Note, we don't use sort_order[] in this macros.
  This is correct even for case insensitive collations:
  - basic Latin letters are processed outside this macros;
  - for other characters sort_order[x] is equal to x.
*/
#define my_strnxfrm_mb_non_ascii_char(cs, dst, src, se)                  \
{                                                                        \
  switch (cs->cset->ismbchar(cs, (const char*) src, (const char*) se)) { \
  case 4:                                                                \
    *dst++= *src++;                                                      \
    /* fall through */                                                   \
  case 3:                                                                \
    *dst++= *src++;                                                      \
    /* fall through */                                                   \
  case 2:                                                                \
    *dst++= *src++;                                                      \
    /* fall through */                                                   \
  case 0:                                                                \
    *dst++= *src++; /* byte in range 0x80..0xFF which is not MB head */  \
  }                                                                      \
}


/*
  For character sets with two or three byte multi-byte
  characters having multibyte weights *equal* to their codes:
  cp932, euckr, gb2312, sjis, eucjpms, ujis.
*/
size_t
my_strnxfrm_mb(const CHARSET_INFO *cs,
               uchar *dst, size_t dstlen, uint nweights,
               const uchar *src, size_t srclen, uint flags)
{
  uchar *d0= dst;
  uchar *de= dst + dstlen;
  const uchar *se= src + srclen;
  const uchar *sort_order= cs->sort_order;

  DBUG_ASSERT(cs->mbmaxlen <= 4);

  /*
    If "srclen" is smaller than both "dstlen" and "nweights"
    then we can run a simplified loop -
    without checking "nweights" and "de".
  */
  if (dstlen >= srclen && nweights >= srclen)
  {
    if (sort_order)
    {
      /* Optimized version for a case insensitive collation */
      for (; src < se; nweights--)
      {
        if (*src < 128) /* quickly catch ASCII characters */
          *dst++= sort_order[*src++];
        else
          my_strnxfrm_mb_non_ascii_char(cs, dst, src, se);
      }
    }
    else
    {
      /* Optimized version for a case sensitive collation (no sort_order) */
      for (; src < se; nweights--)
      {
        if (*src < 128) /* quickly catch ASCII characters */
          *dst++= *src++;
        else
          my_strnxfrm_mb_non_ascii_char(cs, dst, src, se);
      }
    }
    goto pad;
  }

  /*
    A thourough loop, checking all possible limits:
    "se", "nweights" and "de".
  */
  for (; src < se && nweights && dst < de; nweights--)
  {
    int chlen;
    if (*src < 128 ||
        !(chlen= cs->cset->ismbchar(cs, (const char*) src, (const char*) se)))
    {
      /* Single byte character */
      *dst++= sort_order ? sort_order[*src++] : *src++;
    }
    else
    {
      /* Multi-byte character */
      size_t len= (dst + chlen <= de) ? chlen : de - dst;
      memcpy(dst, src, len);
      dst+= len;
      src+= len;
    }
  }

pad:
  return my_strxfrm_pad_desc_and_reverse(cs, d0, dst, de, nweights, flags, 0);
}


int
my_strcasecmp_mb_bin(const CHARSET_INFO *cs MY_ATTRIBUTE((unused)),
                     const char *s, const char *t)
{
  return strcmp(s,t);
}


void
my_hash_sort_mb_bin(const CHARSET_INFO *cs MY_ATTRIBUTE((unused)),
                    const uchar *key, size_t len,ulong *nr1, ulong *nr2)
{
  const uchar *pos = key;
  
  /*
     Remove trailing spaces. We have to do this to be able to compare
    'A ' and 'A' as identical
  */
  key= skip_trailing_space(key, len);
  
  for (; pos < (uchar*) key ; pos++)
  {
    nr1[0]^=(ulong) ((((uint) nr1[0] & 63)+nr2[0]) * 
	     ((uint)*pos)) + (nr1[0] << 8);
    nr2[0]+=3;
  }
}


/* 
  Fill the given buffer with 'maximum character' for given charset
  SYNOPSIS
      pad_max_char()
      cs   Character set
      str  Start of buffer to fill
      end  End of buffer to fill

  DESCRIPTION
      Write max key:
      - for non-Unicode character sets:
        just memset using max_sort_char if max_sort_char is one byte.
        In case when max_sort_char is two bytes, fill with double-byte pairs
        and optionally pad with a single space character.
      - for Unicode character set (utf-8):
        create a buffer with multibyte representation of the max_sort_char
        character, and copy it into max_str in a loop. 
*/
static void pad_max_char(const CHARSET_INFO *cs, char *str, char *end)
{
  char buf[10];
  char buflen;
  
  if (!(cs->state & MY_CS_UNICODE))
  {
    if (cs->max_sort_char <= 255)
    {
      memset(str, cs->max_sort_char, end - str);
      return;
    }
    else if (cs->max_sort_char <= 0xFFFF)
    {
      buf[0]= (char)(cs->max_sort_char >> 8);
      buf[1]= cs->max_sort_char & 0xFF;
      buflen= 2;
    }
    else
    {
      /* Currently, it's only for GB18030, so it must be a 4-byte char */
      DBUG_ASSERT(cs->max_sort_char > 0xFFFFFF);
      buf[0]= cs->max_sort_char >> 24 & 0xFF;
      buf[1]= cs->max_sort_char >> 16 & 0xFF;
      buf[2]= cs->max_sort_char >> 8 & 0xFF;
      buf[3]= cs->max_sort_char & 0xFF;
      buflen= 4;
    }
  }
  else
  {
    buflen= cs->cset->wc_mb(cs, cs->max_sort_char, (uchar*) buf,
                            (uchar*) buf + sizeof(buf));
  }
  
  DBUG_ASSERT(buflen > 0);
  do
  {
    if ((str + buflen) <= end)
    {
      /* Enough space for the characer */
      memcpy(str, buf, buflen);
      str+= buflen;
    }
    else
    {
      /* 
        There is no space for whole multibyte
        character, then add trailing spaces.
      */  
      *str++= ' ';
    }
  } while (str < end);
}

/*
** Calculate min_str and max_str that ranges a LIKE string.
** Arguments:
** ptr		Pointer to LIKE string.
** ptr_length	Length of LIKE string.
** escape	Escape character in LIKE.  (Normally '\').
**		All escape characters should be removed from min_str and max_str
** res_length	Length of min_str and max_str.
** min_str	Smallest case sensitive string that ranges LIKE.
**		Should be space padded to res_length.
** max_str	Largest case sensitive string that ranges LIKE.
**		Normally padded with the biggest character sort value.
**
** The function should return 0 if ok and 1 if the LIKE string can't be
** optimized !
*/

my_bool my_like_range_mb(const CHARSET_INFO *cs,
			 const char *ptr,size_t ptr_length,
			 pbool escape, pbool w_one, pbool w_many,
			 size_t res_length,
			 char *min_str,char *max_str,
			 size_t *min_length,size_t *max_length)
{
  uint mb_len;
  const char *end= ptr + ptr_length;
  char *min_org= min_str;
  char *min_end= min_str + res_length;
  char *max_end= max_str + res_length;
  size_t maxcharlen= res_length / cs->mbmaxlen;
  const MY_CONTRACTIONS *contractions= my_charset_get_contractions(cs, 0);

  for (; ptr != end && min_str != min_end && maxcharlen ; maxcharlen--)
  {
    /* We assume here that escape, w_any, w_namy are one-byte characters */
    if (*ptr == escape && ptr+1 != end)
      ptr++;                                    /* Skip escape */
    else if (*ptr == w_one || *ptr == w_many)   /* '_' and '%' in SQL */
    {      
fill_max_and_min:
      /*
        Calculate length of keys:
        'a\0\0... is the smallest possible string when we have space expand
        a\ff\ff... is the biggest possible string
      */
      *min_length= ((cs->state & MY_CS_BINSORT) ? (size_t) (min_str - min_org) :
                    res_length);
      *max_length= res_length;
      /* Create min key  */
      do
      {
	*min_str++= (char) cs->min_sort_char;
      } while (min_str != min_end);
      
      /* 
        Write max key: create a buffer with multibyte
        representation of the max_sort_char character,
        and copy it into max_str in a loop. 
      */
      *max_length= res_length;
      pad_max_char(cs, max_str, max_end);
      return 0;
    }
    if ((mb_len= my_ismbchar(cs, ptr, end)) > 1)
    {
      if (ptr+mb_len > end || min_str+mb_len > min_end)
        break;
      while (mb_len--)
       *min_str++= *max_str++= *ptr++;
    }
    else
    {
      /*
        Special case for collations with contractions.
        For example, in Chezh, 'ch' is a separate letter
        which is sorted between 'h' and 'i'.
        If the pattern 'abc%', 'c' at the end can mean:
        - letter 'c' itself,
        - beginning of the contraction 'ch'.

        If we simply return this LIKE range:

         'abc\min\min\min' and 'abc\max\max\max'

        then this query: SELECT * FROM t1 WHERE a LIKE 'abc%'
        will only find values starting from 'abc[^h]',
        but won't find values starting from 'abch'.

        We must ignore contraction heads followed by w_one or w_many.
        ('Contraction head' means any letter which can be the first
        letter in a contraction)

        For example, for Czech 'abc%', we will return LIKE range,
        which is equal to LIKE range for 'ab%':

        'ab\min\min\min\min' and 'ab\max\max\max\max'.

      */
      if (contractions && ptr + 1 < end &&
          my_uca_can_be_contraction_head(contractions, (uchar) *ptr))
      {
        /* Ptr[0] is a contraction head. */
        
        if (ptr[1] == w_one || ptr[1] == w_many)
        {
          /* Contraction head followed by a wildcard, quit. */
          goto fill_max_and_min;
        }
        
        /*
          Some letters can be both contraction heads and contraction tails.
          For example, in Danish 'aa' is a separate single letter which
          is sorted after 'z'. So 'a' can be both head and tail.
          
          If ptr[0]+ptr[1] is a contraction,
          then put both letters together.
          
          If ptr[1] can be a contraction part, but ptr[0]+ptr[1]
          is not a contraction, then we put only ptr[0],
          and continue with ptr[1] on the next loop.
        */
        if (my_uca_can_be_contraction_tail(contractions, (uchar) ptr[1]) &&
            my_uca_contraction2_weight(contractions, (uchar) ptr[0], ptr[1]))
        {
          /* Contraction found */
          if (maxcharlen == 1 || min_str + 1 >= min_end)
          {
            /* Both contraction parts don't fit, quit */
            goto fill_max_and_min;
          }
          
          /* Put contraction head */
          *min_str++= *max_str++= *ptr++;
          maxcharlen--;
        }
      }
      /* Put contraction tail, or a single character */
      *min_str++= *max_str++= *ptr++;    
    }
  }

  *min_length= *max_length = (size_t) (min_str - min_org);
  while (min_str != min_end)
    *min_str++= *max_str++= ' ';           /* Because if key compression */
  return 0;
}


/**
   Calculate min_str and max_str that ranges a LIKE string.
   Generic function, currently used for ucs2, utf16, utf32,
   but should be suitable for any other character sets with
   cs->min_sort_char and cs->max_sort_char represented in
   Unicode code points.

   @param cs           Character set and collation pointer
   @param ptr          Pointer to LIKE pattern.
   @param ptr_length   Length of LIKE pattern.
   @param escape       Escape character pattern,  typically '\'.
   @param w_one        'One character' pattern,   typically '_'.
   @param w_many       'Many characters' pattern, typically '%'.
   @param res_length   Length of min_str and max_str.

   @param[out] min_str Smallest string that ranges LIKE.
   @param[out] max_str Largest string that ranges LIKE.
   @param[out] min_len Length of min_str
   @param[out] max_len Length of max_str

   @return Optimization status.
   @retval FALSE if LIKE pattern can be optimized
   @rerval TRUE if LIKE can't be optimized.
*/
my_bool
my_like_range_generic(const CHARSET_INFO *cs,
                      const char *ptr, size_t ptr_length,
                      pbool escape, pbool w_one, pbool w_many,
                      size_t res_length,
                      char *min_str,char *max_str,
                      size_t *min_length,size_t *max_length)
{
  const char *end= ptr + ptr_length;
  const char *min_org= min_str;
  const char *max_org= max_str;
  char *min_end= min_str + res_length;
  char *max_end= max_str + res_length;
  size_t charlen= res_length / cs->mbmaxlen;
  size_t res_length_diff;
  const MY_CONTRACTIONS *contractions= my_charset_get_contractions(cs, 0);

  for ( ; charlen > 0; charlen--)
  {
    my_wc_t wc, wc2;
    int res;
    if ((res= cs->cset->mb_wc(cs, &wc, (uchar*) ptr, (uchar*) end)) <= 0)
    {
      if (res == MY_CS_ILSEQ) /* Bad sequence */
        return TRUE; /* min_length and max_length are not important */
      break; /* End of the string */
    }
    ptr+= res;

    if (wc == (my_wc_t) escape)
    {
      if ((res= cs->cset->mb_wc(cs, &wc, (uchar*) ptr, (uchar*) end)) <= 0)
      {
        if (res == MY_CS_ILSEQ)
          return TRUE; /* min_length and max_length are not important */
        /*
           End of the string: Escape is the last character.
           Put escape as a normal character.
           We'll will leave the loop on the next iteration.
        */
      }
      else
        ptr+= res;

      /* Put escape character to min_str and max_str  */
      if ((res= cs->cset->wc_mb(cs, wc,
                                (uchar*) min_str, (uchar*) min_end)) <= 0)
        goto pad_set_lengths; /* No space */
      min_str+= res;

      if ((res= cs->cset->wc_mb(cs, wc,
                                (uchar*) max_str, (uchar*) max_end)) <= 0)
        goto pad_set_lengths; /* No space */
      max_str+= res;
      continue;
    }
    else if (wc == (my_wc_t) w_one)
    {
      if ((res= cs->cset->wc_mb(cs, cs->min_sort_char,
                                (uchar*) min_str, (uchar*) min_end)) <= 0)
        goto pad_set_lengths;
      min_str+= res;

      if ((res= cs->cset->wc_mb(cs, cs->max_sort_char,
                                (uchar*) max_str, (uchar*) max_end)) <= 0)
        goto pad_set_lengths;
      max_str+= res;
      continue;
    }
    else if (wc == (my_wc_t) w_many)
    {
      /*
        Calculate length of keys:
        a\min\min... is the smallest possible string
        a\max\max... is the biggest possible string
      */
      *min_length= ((cs->state & MY_CS_BINSORT) ?
                    (size_t) (min_str - min_org) :
                    res_length);
      *max_length= res_length;
      goto pad_min_max;
    }

    if (contractions &&
        my_uca_can_be_contraction_head(contractions, wc) &&
        (res= cs->cset->mb_wc(cs, &wc2, (uchar*) ptr, (uchar*) end)) > 0)
    {
      uint16 *weight;
      if ((wc2 == (my_wc_t) w_one || wc2 == (my_wc_t) w_many))
      {
        /* Contraction head followed by a wildcard */
        *min_length= *max_length= res_length;
        goto pad_min_max;
      }

      if (my_uca_can_be_contraction_tail(contractions, wc2) &&
          (weight= my_uca_contraction2_weight(contractions, wc, wc2)) && weight[0])
      {
        /* Contraction found */
        if (charlen == 1)
        {
          /* contraction does not fit to result */
          *min_length= *max_length= res_length;
          goto pad_min_max;
        }

        ptr+= res;
        charlen--;

        /* Put contraction head */
        if ((res= cs->cset->wc_mb(cs, wc,
                                  (uchar*) min_str, (uchar*) min_end)) <= 0)
          goto pad_set_lengths;
        min_str+= res;

        if ((res= cs->cset->wc_mb(cs, wc,
                                  (uchar*) max_str, (uchar*) max_end)) <= 0)
          goto pad_set_lengths;
        max_str+= res;
        wc= wc2; /* Prepare to put contraction tail */
      }
    }

    /* Normal character, or contraction tail */
    if ((res= cs->cset->wc_mb(cs, wc,
                              (uchar*) min_str, (uchar*) min_end)) <= 0)
      goto pad_set_lengths;
    min_str+= res;
    if ((res= cs->cset->wc_mb(cs, wc,
                              (uchar*) max_str, (uchar*) max_end)) <= 0)
      goto pad_set_lengths;
    max_str+= res;
  }

pad_set_lengths:
  *min_length= (size_t) (min_str - min_org);
  *max_length= (size_t) (max_str - max_org);

pad_min_max:
  /*
    Fill up max_str and min_str to res_length.
    fill() cannot set incomplete characters and
    requires that "length" argument is divisible to mbminlen.
    Make sure to call fill() with proper "length" argument.
  */
  res_length_diff= res_length % cs->mbminlen;
  cs->cset->fill(cs, min_str, min_end - min_str - res_length_diff,
                 cs->min_sort_char);
  cs->cset->fill(cs, max_str, max_end - max_str - res_length_diff,
                 cs->max_sort_char);

  /* In case of incomplete characters set the remainder to 0x00's */
  if (res_length_diff)
  {
    /* Example: odd res_length for ucs2 */
    memset(min_end - res_length_diff, 0, res_length_diff);
    memset(max_end - res_length_diff, 0, res_length_diff);
  }
  return FALSE;
}


static
int
my_wildcmp_mb_bin_impl(const CHARSET_INFO *cs,
                       const char *str,const char *str_end,
                       const char *wildstr,const char *wildend,
                       int escape, int w_one, int w_many, int recurse_level)
{
  int result= -1;				/* Not found, using wildcards */

  if (my_string_stack_guard && my_string_stack_guard(recurse_level))
    return 1;
  while (wildstr != wildend)
  {
    while (*wildstr != w_many && *wildstr != w_one)
    {
      int l;
      if (*wildstr == escape && wildstr+1 != wildend)
	wildstr++;
      if ((l = my_ismbchar(cs, wildstr, wildend)))
      {
	  if (str+l > str_end || memcmp(str, wildstr, l) != 0)
	      return 1;
	  str += l;
	  wildstr += l;
      }
      else
      if (str == str_end || *wildstr++ != *str++)
	return(1);				/* No match */
      if (wildstr == wildend)
	return (str != str_end);		/* Match if both are at end */
      result=1;					/* Found an anchor char */
    }
    if (*wildstr == w_one)
    {
      do
      {
	if (str == str_end)			/* Skip one char if possible */
	  return (result);
	INC_PTR(cs,str,str_end);
      } while (++wildstr < wildend && *wildstr == w_one);
      if (wildstr == wildend)
	break;
    }
    if (*wildstr == w_many)
    {						/* Found w_many */
      int cmp;
      const char* mb = wildstr;
      int mb_len=0;
      
      wildstr++;
      /* Remove any '%' and '_' from the wild search string */
      for (; wildstr != wildend ; wildstr++)
      {
	if (*wildstr == w_many)
	  continue;
	if (*wildstr == w_one)
	{
	  if (str == str_end)
	    return (-1);
	  INC_PTR(cs,str,str_end);
	  continue;
	}
	break;					/* Not a wild character */
      }
      if (wildstr == wildend)
	return(0);				/* Ok if w_many is last */
      if (str == str_end)
	return -1;
      
      if ((cmp= *wildstr) == escape && wildstr+1 != wildend)
	cmp= *++wildstr;
	
      mb=wildstr;
      mb_len= my_ismbchar(cs, wildstr, wildend);
      INC_PTR(cs,wildstr,wildend);		/* This is compared trough cmp */
      do
      {
        for (;;)
        {
          if (str >= str_end)
            return -1;
          if (mb_len)
          {
            if (str+mb_len <= str_end && memcmp(str, mb, mb_len) == 0)
            {
              str += mb_len;
              break;
            }
          }
          else if (!my_ismbchar(cs, str, str_end) && *str == cmp)
          {
            str++;
            break;
          }
          INC_PTR(cs,str, str_end);
        }
	{
	  int tmp=my_wildcmp_mb_bin_impl(cs,str,str_end,
                                         wildstr,wildend,escape,
                                         w_one,w_many, recurse_level + 1);
	  if (tmp <= 0)
	    return (tmp);
	}
      } while (str != str_end && wildstr[0] != w_many);
      return(-1);
    }
  }
  return (str != str_end ? 1 : 0);
}

int
my_wildcmp_mb_bin(const CHARSET_INFO *cs,
                  const char *str,const char *str_end,
                  const char *wildstr,const char *wildend,
                  int escape, int w_one, int w_many)
{
  return my_wildcmp_mb_bin_impl(cs, str, str_end,
                                wildstr, wildend,
                                escape, w_one, w_many, 1);
}


/*
  Data was produced from EastAsianWidth.txt
  using utt11-dump utility.
*/
static const char pg11[256]=
{
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,1,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};

static const char pg23[256]=
{
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};

static const char pg2E[256]=
{
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0
};

static const char pg2F[256]=
{
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0
};

static const char pg30[256]=
{
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,
0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
};

static const char pg31[256]=
{
0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
};

static const char pg32[256]=
{
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0
};

static const char pg4D[256]=
{
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};

static const char pg9F[256]=
{
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};

static const char pgA4[256]=
{
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};

static const char pgD7[256]=
{
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};

static const char pgFA[256]=
{
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};

static const char pgFE[256]=
{
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};

static const char pgFF[256]=
{
0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
};

static const struct {int page; const char *p;} utr11_data[256]=
{
{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},
{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},
{0,NULL},{0,pg11},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},
{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},
{0,NULL},{0,NULL},{0,NULL},{0,pg23},{0,NULL},{0,NULL},{0,NULL},{0,NULL},
{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,pg2E},{0,pg2F},
{0,pg30},{0,pg31},{0,pg32},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{0,pg4D},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{0,pg9F},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{0,pgA4},{0,NULL},{0,NULL},{0,NULL},
{0,NULL},{0,NULL},{0,NULL},{0,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},
{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{1,NULL},{0,pgD7},
{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},
{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},
{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},
{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},{0,NULL},
{0,NULL},{1,NULL},{0,pgFA},{0,NULL},{0,NULL},{0,NULL},{0,pgFE},{0,pgFF}
};


size_t my_numcells_mb(const CHARSET_INFO *cs, const char *b, const char *e)
{
  my_wc_t wc;
  size_t clen= 0;
  
  while (b < e)
  {
    int mb_len;
    uint pg;
    if ((mb_len= cs->cset->mb_wc(cs, &wc, (uchar*) b, (uchar*) e)) <= 0 ||
        wc > 0xFFFF)
    {
      /*
        Let's think a wrong sequence takes 1 dysplay cell.
        Also, consider supplementary characters as taking one cell.
      */
      mb_len= 1;
      b++;
      continue;
    }
    b+= mb_len;
    if (wc > 0xFFFF)
    {
      if (wc >= 0x20000 && wc <= 0x3FFFD) /* CJK Ideograph Extension B, C */
        clen+= 1;
    }
    else
    {
      pg= (wc >> 8) & 0xFF;
      clen+= utr11_data[pg].p ? utr11_data[pg].p[wc & 0xFF] : utr11_data[pg].page;
    }
    clen++;
  }
  return clen;
}


int my_mb_ctype_mb(const CHARSET_INFO *cs, int *ctype,
                   const uchar *s, const uchar *e)
{
  my_wc_t wc;
  int res= cs->cset->mb_wc(cs, &wc, s, e);
  if (res <= 0 || wc > 0xFFFF)
    *ctype= 0;
  else
    *ctype= my_uni_ctype[wc>>8].ctype ?
            my_uni_ctype[wc>>8].ctype[wc&0xFF] :
            my_uni_ctype[wc>>8].pctype;    
  return res;
}


MY_COLLATION_HANDLER my_collation_mb_bin_handler =
{
    NULL,		/* init */
    my_strnncoll_mb_bin,
    my_strnncollsp_mb_bin,
    my_strnxfrm_mb,
    my_strnxfrmlen_simple,
    my_like_range_mb,
    my_wildcmp_mb_bin,
    my_strcasecmp_mb_bin,
    my_instr_mb,
    my_hash_sort_mb_bin,
    my_propagate_simple
};