enc/unicode.c

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/**********************************************************************
  unicode.c -  Oniguruma (regular expression library)
**********************************************************************/
/*-
 * Copyright (c) 2002-2008  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "regint.h"

#define ONIGENC_IS_UNICODE_ISO_8859_1_CTYPE(code,ctype) \
  ((EncUNICODE_ISO_8859_1_CtypeTable[code] & CTYPE_TO_BIT(ctype)) != 0)
#if 0
#define ONIGENC_IS_UNICODE_ISO_8859_1_BIT_CTYPE(code,cbit) \
  ((EncUNICODE_ISO_8859_1_CtypeTable[code] & (cbit)) != 0)
#endif

static const unsigned short EncUNICODE_ISO_8859_1_CtypeTable[256] = {
  0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008,
  0x4008, 0x420c, 0x4209, 0x4208, 0x4208, 0x4208, 0x4008, 0x4008,
  0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008,
  0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008, 0x4008,
  0x4284, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0,
  0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0,
  0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0, 0x78b0,
  0x78b0, 0x78b0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x41a0,
  0x41a0, 0x7ca2, 0x7ca2, 0x7ca2, 0x7ca2, 0x7ca2, 0x7ca2, 0x74a2,
  0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2,
  0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2, 0x74a2,
  0x74a2, 0x74a2, 0x74a2, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x51a0,
  0x41a0, 0x78e2, 0x78e2, 0x78e2, 0x78e2, 0x78e2, 0x78e2, 0x70e2,
  0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2,
  0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2, 0x70e2,
  0x70e2, 0x70e2, 0x70e2, 0x41a0, 0x41a0, 0x41a0, 0x41a0, 0x4008,
  0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0288, 0x0008, 0x0008,
  0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0008,
  0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0008,
  0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0008, 0x0008,
  0x0284, 0x01a0, 0x00a0, 0x00a0, 0x00a0, 0x00a0, 0x00a0, 0x00a0,
  0x00a0, 0x00a0, 0x30e2, 0x01a0, 0x00a0, 0x00a8, 0x00a0, 0x00a0,
  0x00a0, 0x00a0, 0x10a0, 0x10a0, 0x00a0, 0x30e2, 0x00a0, 0x01a0,
  0x00a0, 0x10a0, 0x30e2, 0x01a0, 0x10a0, 0x10a0, 0x10a0, 0x01a0,
  0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2,
  0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2,
  0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x00a0,
  0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x34a2, 0x30e2,
  0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2,
  0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2,
  0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x00a0,
  0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2, 0x30e2
};

#include "enc/unicode/name2ctype.h"

typedef struct {
  int n;
  OnigCodePoint code[3];
} CodePointList3;

typedef struct {
  OnigCodePoint  from;
  CodePointList3 to;
} CaseFold_11_Type;

typedef struct {
  OnigCodePoint  from;
  CodePointList3 to;
} CaseUnfold_11_Type;

typedef struct {
  int n;
  OnigCodePoint code[2];
} CodePointList2;

typedef struct {
  OnigCodePoint  from[2];
  CodePointList2 to;
} CaseUnfold_12_Type;

typedef struct {
  OnigCodePoint  from[3];
  CodePointList2 to;
} CaseUnfold_13_Type;

#include "enc/unicode/casefold.h"


#define numberof(array) (int)(sizeof(array) / sizeof((array)[0]))
#define CODE_RANGES_NUM numberof(CodeRanges)

extern int
onigenc_unicode_is_code_ctype(OnigCodePoint code, unsigned int ctype, OnigEncoding enc ARG_UNUSED)
{
  if (
#ifdef USE_UNICODE_PROPERTIES
      ctype <= ONIGENC_MAX_STD_CTYPE &&
#endif
      code < 256) {
    return ONIGENC_IS_UNICODE_ISO_8859_1_CTYPE(code, ctype);
  }

  if (ctype >= CODE_RANGES_NUM) {
    return ONIGERR_TYPE_BUG;
  }

  return onig_is_in_code_range((UChar* )CodeRanges[ctype], code);
}


extern int
onigenc_unicode_ctype_code_range(int ctype, const OnigCodePoint* ranges[])
{
  if (ctype >= CODE_RANGES_NUM) {
    return ONIGERR_TYPE_BUG;
  }

  *ranges = CodeRanges[ctype];

  return 0;
}

extern int
onigenc_utf16_32_get_ctype_code_range(OnigCtype ctype, OnigCodePoint* sb_out,
                                      const OnigCodePoint* ranges[],
                                      struct OnigEncodingTypeST* enc ARG_UNUSED)
{
  *sb_out = 0x00;
  return onigenc_unicode_ctype_code_range(ctype, ranges);
}

#include "ruby/st.h"

#define PROPERTY_NAME_MAX_SIZE    (MAX_WORD_LENGTH + 1)

extern int
onigenc_unicode_property_name_to_ctype(OnigEncoding enc, UChar* name, UChar* end)
{
  int len;
  int ctype;
  UChar buf[PROPERTY_NAME_MAX_SIZE];
  UChar *p;
  OnigCodePoint code;

  len = 0;
  for (p = name; p < end; p += enclen(enc, p, end)) {
    code = ONIGENC_MBC_TO_CODE(enc, p, end);
    if (code == ' ' || code == '-' || code == '_')
      continue;
    if (code >= 0x80)
      return ONIGERR_INVALID_CHAR_PROPERTY_NAME;

    buf[len++] = ONIGENC_ASCII_CODE_TO_LOWER_CASE(code);
    if (len >= PROPERTY_NAME_MAX_SIZE)
      return ONIGERR_INVALID_CHAR_PROPERTY_NAME;
  }

  buf[len] = 0;

  if ((ctype = uniname2ctype(buf, len)) < 0) {
    return ONIGERR_INVALID_CHAR_PROPERTY_NAME;
  }

  return ctype;
}


static int
code2_cmp(OnigCodePoint* x, OnigCodePoint* y)
{
  if (x[0] == y[0] && x[1] == y[1]) return 0;
  return 1;
}

static st_index_t
code2_hash(OnigCodePoint* x)
{
  return (st_index_t )(x[0] + x[1]);
}

static const struct st_hash_type type_code2_hash = {
  code2_cmp,
  code2_hash,
};

static int
code3_cmp(OnigCodePoint* x, OnigCodePoint* y)
{
  if (x[0] == y[0] && x[1] == y[1] && x[2] == y[2]) return 0;
  return 1;
}

static st_index_t
code3_hash(OnigCodePoint* x)
{
  return (st_index_t )(x[0] + x[1] + x[2]);
}

static const struct st_hash_type type_code3_hash = {
  code3_cmp,
  code3_hash,
};


static st_table* FoldTable;    /* fold-1, fold-2, fold-3 */
static st_table* Unfold1Table;
static st_table* Unfold2Table;
static st_table* Unfold3Table;
static int CaseFoldInited = 0;

static int init_case_fold_table(void)
{
  const CaseFold_11_Type   *p;
  const CaseUnfold_11_Type *p1;
  const CaseUnfold_12_Type *p2;
  const CaseUnfold_13_Type *p3;
  int i;

  THREAD_ATOMIC_START;

  FoldTable = st_init_numtable_with_size(FOLD_TABLE_SIZE);
  if (ONIG_IS_NULL(FoldTable)) return ONIGERR_MEMORY;
  for (i = 0; i < numberof(CaseFold); i++) {
    p = &CaseFold[i];
    st_add_direct(FoldTable, (st_data_t )p->from, (st_data_t )&(p->to));
  }
  for (i = 0; i < numberof(CaseFold_Locale); i++) {
    p = &CaseFold_Locale[i];
    st_add_direct(FoldTable, (st_data_t )p->from, (st_data_t )&(p->to));
  }

  Unfold1Table = st_init_numtable_with_size(UNFOLD1_TABLE_SIZE);
  if (ONIG_IS_NULL(Unfold1Table)) return ONIGERR_MEMORY;

  for (i = 0; i < numberof(CaseUnfold_11); i++) {
    p1 = &CaseUnfold_11[i];
    st_add_direct(Unfold1Table, (st_data_t )p1->from, (st_data_t )&(p1->to));
  }
  for (i = 0; i < numberof(CaseUnfold_11_Locale); i++) {
    p1 = &CaseUnfold_11_Locale[i];
    st_add_direct(Unfold1Table, (st_data_t )p1->from, (st_data_t )&(p1->to));
  }

  Unfold2Table = st_init_table_with_size(&type_code2_hash, UNFOLD2_TABLE_SIZE);
  if (ONIG_IS_NULL(Unfold2Table)) return ONIGERR_MEMORY;

  for (i = 0; i < numberof(CaseUnfold_12); i++) {
    p2 = &CaseUnfold_12[i];
    st_add_direct(Unfold2Table, (st_data_t )p2->from, (st_data_t )(&p2->to));
  }
  for (i = 0; i < numberof(CaseUnfold_12_Locale); i++) {
    p2 = &CaseUnfold_12_Locale[i];
    st_add_direct(Unfold2Table, (st_data_t )p2->from, (st_data_t )(&p2->to));
  }

  Unfold3Table = st_init_table_with_size(&type_code3_hash, UNFOLD3_TABLE_SIZE);
  if (ONIG_IS_NULL(Unfold3Table)) return ONIGERR_MEMORY;

  for (i = 0; i < numberof(CaseUnfold_13); i++) {
    p3 = &CaseUnfold_13[i];
    st_add_direct(Unfold3Table, (st_data_t )p3->from, (st_data_t )(&p3->to));
  }

  CaseFoldInited = 1;
  THREAD_ATOMIC_END;
  return 0;
}

extern int
onigenc_unicode_mbc_case_fold(OnigEncoding enc,
    OnigCaseFoldType flag ARG_UNUSED, const UChar** pp, const UChar* end,
    UChar* fold)
{
  CodePointList3 *to;
  OnigCodePoint code;
  int i, len, rlen;
  const UChar *p = *pp;

  if (CaseFoldInited == 0) init_case_fold_table();

  code = ONIGENC_MBC_TO_CODE(enc, p, end);
  len = enclen(enc, p, end);
  *pp += len;

#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
  if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
    if (code == 0x0049) {
      return ONIGENC_CODE_TO_MBC(enc, 0x0131, fold);
    }
    else if (code == 0x0130) {
      return ONIGENC_CODE_TO_MBC(enc, 0x0069, fold);
    }
  }
#endif

  if (onig_st_lookup(FoldTable, (st_data_t )code, (void* )&to) != 0) {
    if (to->n == 1) {
      return ONIGENC_CODE_TO_MBC(enc, to->code[0], fold);
    }
#if 0
    /* NO NEEDS TO CHECK */
    else if ((flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0)
#else
    else
#endif
    {
      rlen = 0;
      for (i = 0; i < to->n; i++) {
        len = ONIGENC_CODE_TO_MBC(enc, to->code[i], fold);
        fold += len;
        rlen += len;
      }
      return rlen;
    }
  }

  for (i = 0; i < len; i++) {
    *fold++ = *p++;
  }
  return len;
}

extern int
onigenc_unicode_apply_all_case_fold(OnigCaseFoldType flag,
                                    OnigApplyAllCaseFoldFunc f, void* arg,
                                    OnigEncoding enc ARG_UNUSED)
{
  const CaseUnfold_11_Type* p11;
  OnigCodePoint code;
  int i, j, k, r;

  /* if (CaseFoldInited == 0) init_case_fold_table(); */

  for (i = 0; i < numberof(CaseUnfold_11); i++) {
    p11 = &CaseUnfold_11[i];
    for (j = 0; j < p11->to.n; j++) {
      code = p11->from;
      r = (*f)(p11->to.code[j], &code, 1, arg);
      if (r != 0) return r;

      code = p11->to.code[j];
      r = (*f)(p11->from, &code, 1, arg);
      if (r != 0) return r;

      for (k = 0; k < j; k++) {
        r = (*f)(p11->to.code[j], (OnigCodePoint* )(&p11->to.code[k]), 1, arg);
        if (r != 0) return r;

        r = (*f)(p11->to.code[k], (OnigCodePoint* )(&p11->to.code[j]), 1, arg);
        if (r != 0) return r;
      }
    }
  }

#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
  if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
    code = 0x0131;
    r = (*f)(0x0049, &code, 1, arg);
    if (r != 0) return r;
    code = 0x0049;
    r = (*f)(0x0131, &code, 1, arg);
    if (r != 0) return r;

    code = 0x0130;
    r = (*f)(0x0069, &code, 1, arg);
    if (r != 0) return r;
    code = 0x0069;
    r = (*f)(0x0130, &code, 1, arg);
    if (r != 0) return r;
  }
  else {
#endif
    for (i = 0; i < numberof(CaseUnfold_11_Locale); i++) {
      p11 = &CaseUnfold_11_Locale[i];
      for (j = 0; j < p11->to.n; j++) {
        code = p11->from;
        r = (*f)(p11->to.code[j], &code, 1, arg);
        if (r != 0) return r;

        code = p11->to.code[j];
        r = (*f)(p11->from, &code, 1, arg);
        if (r != 0) return r;

        for (k = 0; k < j; k++) {
          r = (*f)(p11->to.code[j], (OnigCodePoint* )(&p11->to.code[k]),
                   1, arg);
          if (r != 0) return r;

          r = (*f)(p11->to.code[k], (OnigCodePoint* )(&p11->to.code[j]),
                   1, arg);
          if (r != 0) return r;
        }
      }
    }
#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
  }
#endif

  if ((flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0) {
    for (i = 0; i < numberof(CaseUnfold_12); i++) {
      for (j = 0; j < CaseUnfold_12[i].to.n; j++) {
        r = (*f)(CaseUnfold_12[i].to.code[j],
                 (OnigCodePoint* )CaseUnfold_12[i].from, 2, arg);
        if (r != 0) return r;

        for (k = 0; k < CaseUnfold_12[i].to.n; k++) {
          if (k == j) continue;

          r = (*f)(CaseUnfold_12[i].to.code[j],
                   (OnigCodePoint* )(&CaseUnfold_12[i].to.code[k]), 1, arg);
          if (r != 0) return r;
        }
      }
    }

#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
    if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) == 0) {
#endif
      for (i = 0; i < numberof(CaseUnfold_12_Locale); i++) {
        for (j = 0; j < CaseUnfold_12_Locale[i].to.n; j++) {
          r = (*f)(CaseUnfold_12_Locale[i].to.code[j],
                   (OnigCodePoint* )CaseUnfold_12_Locale[i].from, 2, arg);
          if (r != 0) return r;

          for (k = 0; k < CaseUnfold_12_Locale[i].to.n; k++) {
            if (k == j) continue;

            r = (*f)(CaseUnfold_12_Locale[i].to.code[j],
                     (OnigCodePoint* )(&CaseUnfold_12_Locale[i].to.code[k]),
                     1, arg);
            if (r != 0) return r;
          }
        }
      }
#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
    }
#endif

    for (i = 0; i < numberof(CaseUnfold_13); i++) {
      for (j = 0; j < CaseUnfold_13[i].to.n; j++) {
        r = (*f)(CaseUnfold_13[i].to.code[j],
                 (OnigCodePoint* )CaseUnfold_13[i].from, 3, arg);
        if (r != 0) return r;

        for (k = 0; k < CaseUnfold_13[i].to.n; k++) {
          if (k == j) continue;

          r = (*f)(CaseUnfold_13[i].to.code[j],
                   (OnigCodePoint* )(&CaseUnfold_13[i].to.code[k]), 1, arg);
          if (r != 0) return r;
        }
      }
    }
  }

  return 0;
}

extern int
onigenc_unicode_get_case_fold_codes_by_str(OnigEncoding enc,
    OnigCaseFoldType flag, const OnigUChar* p, const OnigUChar* end,
    OnigCaseFoldCodeItem items[])
{
  int n, i, j, k, len;
  OnigCodePoint code, codes[3];
  CodePointList3 *to, *z3;
  CodePointList2 *z2;

  if (CaseFoldInited == 0) init_case_fold_table();

  n = 0;

  code = ONIGENC_MBC_TO_CODE(enc, p, end);
  len = enclen(enc, p, end);

#ifdef USE_UNICODE_CASE_FOLD_TURKISH_AZERI
  if ((flag & ONIGENC_CASE_FOLD_TURKISH_AZERI) != 0) {
    if (code == 0x0049) {
      items[0].byte_len = len;
      items[0].code_len = 1;
      items[0].code[0]  = 0x0131;
      return 1;
    }
    else if (code == 0x0130) {
      items[0].byte_len = len;
      items[0].code_len = 1;
      items[0].code[0]  = 0x0069;
      return 1;
    }
    else if (code == 0x0131) {
      items[0].byte_len = len;
      items[0].code_len = 1;
      items[0].code[0]  = 0x0049;
      return 1;
    }
    else if (code == 0x0069) {
      items[0].byte_len = len;
      items[0].code_len = 1;
      items[0].code[0]  = 0x0130;
      return 1;
    }
  }
#endif

  if (onig_st_lookup(FoldTable, (st_data_t )code, (void* )&to) != 0) {
    if (to->n == 1) {
      OnigCodePoint orig_code = code;

      items[0].byte_len = len;
      items[0].code_len = 1;
      items[0].code[0]  = to->code[0];
      n++;

      code = to->code[0];
      if (onig_st_lookup(Unfold1Table, (st_data_t )code, (void* )&to) != 0) {
        for (i = 0; i < to->n; i++) {
          if (to->code[i] != orig_code) {
            items[n].byte_len = len;
            items[n].code_len = 1;
            items[n].code[0]  = to->code[i];
            n++;
          }
        }
      }
    }
    else if ((flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0) {
      OnigCodePoint cs[3][4];
      int fn, ncs[3];

      for (fn = 0; fn < to->n; fn++) {
        cs[fn][0] = to->code[fn];
        if (onig_st_lookup(Unfold1Table, (st_data_t )cs[fn][0],
                           (void* )&z3) != 0) {
          for (i = 0; i < z3->n; i++) {
            cs[fn][i+1] = z3->code[i];
          }
          ncs[fn] = z3->n + 1;
        }
        else
          ncs[fn] = 1;
      }

      if (fn == 2) {
        for (i = 0; i < ncs[0]; i++) {
          for (j = 0; j < ncs[1]; j++) {
            items[n].byte_len = len;
            items[n].code_len = 2;
            items[n].code[0]  = cs[0][i];
            items[n].code[1]  = cs[1][j];
            n++;
          }
        }

        if (onig_st_lookup(Unfold2Table, (st_data_t )to->code,
                           (void* )&z2) != 0) {
          for (i = 0; i < z2->n; i++) {
            if (z2->code[i] == code) continue;

            items[n].byte_len = len;
            items[n].code_len = 1;
            items[n].code[0]  = z2->code[i];
            n++;
          }
        }
      }
      else {
        for (i = 0; i < ncs[0]; i++) {
          for (j = 0; j < ncs[1]; j++) {
            for (k = 0; k < ncs[2]; k++) {
              items[n].byte_len = len;
              items[n].code_len = 3;
              items[n].code[0]  = cs[0][i];
              items[n].code[1]  = cs[1][j];
              items[n].code[2]  = cs[2][k];
              n++;
            }
          }
        }

        if (onig_st_lookup(Unfold3Table, (st_data_t )to->code,
                           (void* )&z2) != 0) {
          for (i = 0; i < z2->n; i++) {
            if (z2->code[i] == code) continue;

            items[n].byte_len = len;
            items[n].code_len = 1;
            items[n].code[0]  = z2->code[i];
            n++;
          }
        }
      }

      /* multi char folded code is not head of another folded multi char */
      flag = 0; /* DISABLE_CASE_FOLD_MULTI_CHAR(flag); */
    }
  }
  else {
    if (onig_st_lookup(Unfold1Table, (st_data_t )code, (void* )&to) != 0) {
      for (i = 0; i < to->n; i++) {
        items[n].byte_len = len;
        items[n].code_len = 1;
        items[n].code[0]  = to->code[i];
        n++;
      }
    }
  }


  if ((flag & INTERNAL_ONIGENC_CASE_FOLD_MULTI_CHAR) != 0) {
    p += len;
    if (p < end) {
      int clen;

      codes[0] = code;
      code = ONIGENC_MBC_TO_CODE(enc, p, end);
      if (onig_st_lookup(FoldTable, (st_data_t )code, (void* )&to) != 0
          && to->n == 1) {
        codes[1] = to->code[0];
      }
      else
        codes[1] = code;

      clen = enclen(enc, p, end);
      len += clen;
      if (onig_st_lookup(Unfold2Table, (st_data_t )codes, (void* )&z2) != 0) {
        for (i = 0; i < z2->n; i++) {
          items[n].byte_len = len;
          items[n].code_len = 1;
          items[n].code[0]  = z2->code[i];
          n++;
        }
      }

      p += clen;
      if (p < end) {
        code = ONIGENC_MBC_TO_CODE(enc, p, end);
        if (onig_st_lookup(FoldTable, (st_data_t )code, (void* )&to) != 0
            && to->n == 1) {
          codes[2] = to->code[0];
        }
        else
          codes[2] = code;

        clen = enclen(enc, p, end);
        len += clen;
        if (onig_st_lookup(Unfold3Table, (st_data_t )codes,
                           (void* )&z2) != 0) {
          for (i = 0; i < z2->n; i++) {
            items[n].byte_len = len;
            items[n].code_len = 1;
            items[n].code[0]  = z2->code[i];
            n++;
          }
        }
      }
    }
  }

  return n;
}

---