libmisc: Add utf8proc-v1.1.5

utf8proc is a small library for processing UTF-8 encoded Unicode strings.
Some features are Unicode normalization, stripping of default ignorable characters, case folding and detection of grapheme cluster boundaries.
For the time beeing utf8proc is intended to be used for normalizing and folding UTF-8 strings
for comparison purposes when adding UTF-8 support to the FAT file system.

1 files changed, 587 insertions, 0 deletions

diff --git a/cpukit/libmisc/utf8proc/utf8proc.c b/cpukit/libmisc/utf8proc/utf8proc.c
new file mode 100644
index 0000000000..520760790c
--- /dev/null
+++ b/cpukit/libmisc/utf8proc/utf8proc.c
@@ -0,0 +1,587 @@
+/*
+ *  Copyright (c) 2009 Public Software Group e. V., Berlin, Germany
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a
+ *  copy of this software and associated documentation files (the "Software"),
+ *  to deal in the Software without restriction, including without limitation
+ *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ *  and/or sell copies of the Software, and to permit persons to whom the
+ *  Software is furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in
+ *  all copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ *  DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ *  This library contains derived data from a modified version of the
+ *  Unicode data files.
+ *
+ *  The original data files are available at
+ *  http://www.unicode.org/Public/UNIDATA/
+ *
+ *  Please notice the copyright statement in the file "utf8proc_data.c".
+ */
+
+
+/*
+ *  File name:    utf8proc.c
+ *
+ *  Description:
+ *  Implementation of libutf8proc.
+ */
+
+
+#include "utf8proc.h"
+#include "utf8proc_data.c"
+
+
+const int8_t utf8proc_utf8class[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,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
+  3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+  4, 4, 4, 4, 4, 4, 4, 4, 0, 0, 0, 0, 0, 0, 0, 0 };
+
+#define UTF8PROC_HANGUL_SBASE 0xAC00
+#define UTF8PROC_HANGUL_LBASE 0x1100
+#define UTF8PROC_HANGUL_VBASE 0x1161
+#define UTF8PROC_HANGUL_TBASE 0x11A7
+#define UTF8PROC_HANGUL_LCOUNT 19
+#define UTF8PROC_HANGUL_VCOUNT 21
+#define UTF8PROC_HANGUL_TCOUNT 28
+#define UTF8PROC_HANGUL_NCOUNT 588
+#define UTF8PROC_HANGUL_SCOUNT 11172
+/* END is exclusive */
+#define UTF8PROC_HANGUL_L_START  0x1100
+#define UTF8PROC_HANGUL_L_END    0x115A
+#define UTF8PROC_HANGUL_L_FILLER 0x115F
+#define UTF8PROC_HANGUL_V_START  0x1160
+#define UTF8PROC_HANGUL_V_END    0x11A3
+#define UTF8PROC_HANGUL_T_START  0x11A8
+#define UTF8PROC_HANGUL_T_END    0x11FA
+#define UTF8PROC_HANGUL_S_START  0xAC00
+#define UTF8PROC_HANGUL_S_END    0xD7A4
+
+
+#define UTF8PROC_BOUNDCLASS_START    0
+#define UTF8PROC_BOUNDCLASS_OTHER    1
+#define UTF8PROC_BOUNDCLASS_CR       2
+#define UTF8PROC_BOUNDCLASS_LF       3
+#define UTF8PROC_BOUNDCLASS_CONTROL  4
+#define UTF8PROC_BOUNDCLASS_EXTEND   5
+#define UTF8PROC_BOUNDCLASS_L        6
+#define UTF8PROC_BOUNDCLASS_V        7
+#define UTF8PROC_BOUNDCLASS_T        8
+#define UTF8PROC_BOUNDCLASS_LV       9
+#define UTF8PROC_BOUNDCLASS_LVT     10
+
+
+const char *utf8proc_version(void) {
+  return "1.1.5";
+}
+
+const char *utf8proc_errmsg(ssize_t errcode) {
+  switch (errcode) {
+    case UTF8PROC_ERROR_NOMEM:
+    return "Memory for processing UTF-8 data could not be allocated.";
+    case UTF8PROC_ERROR_OVERFLOW:
+    return "UTF-8 string is too long to be processed.";
+    case UTF8PROC_ERROR_INVALIDUTF8:
+    return "Invalid UTF-8 string";
+    case UTF8PROC_ERROR_NOTASSIGNED:
+    return "Unassigned Unicode code point found in UTF-8 string.";
+    case UTF8PROC_ERROR_INVALIDOPTS:
+    return "Invalid options for UTF-8 processing chosen.";
+    default:
+    return "An unknown error occured while processing UTF-8 data.";
+  }
+}
+
+ssize_t utf8proc_iterate(
+  const uint8_t *str, ssize_t strlen, int32_t *dst
+) {
+  int length;
+  int i;
+  int32_t uc = -1;
+  *dst = -1;
+  if (!strlen) return 0;
+  length = utf8proc_utf8class[str[0]];
+  if (!length) return UTF8PROC_ERROR_INVALIDUTF8;
+  if (strlen >= 0 && length > strlen) return UTF8PROC_ERROR_INVALIDUTF8;
+  for (i=1; i<length; i++) {
+    if ((str[i] & 0xC0) != 0x80) return UTF8PROC_ERROR_INVALIDUTF8;
+  }
+  switch (length) {
+    case 1:
+    uc = str[0];
+    break;
+    case 2:
+    uc = ((str[0] & 0x1F) <<  6) + (str[1] & 0x3F);
+    if (uc < 0x80) uc = -1;
+    break;
+    case 3:
+    uc = ((str[0] & 0x0F) << 12) + ((str[1] & 0x3F) <<  6)
+      + (str[2] & 0x3F);
+    if (uc < 0x800 || (uc >= 0xD800 && uc < 0xE000) ||
+      (uc >= 0xFDD0 && uc < 0xFDF0)) uc = -1;
+    break;
+    case 4:
+    uc = ((str[0] & 0x07) << 18) + ((str[1] & 0x3F) << 12)
+      + ((str[2] & 0x3F) <<  6) + (str[3] & 0x3F);
+    if (uc < 0x10000 || uc >= 0x110000) uc = -1;
+    break;
+  }
+  if (uc < 0 || ((uc & 0xFFFF) >= 0xFFFE))
+    return UTF8PROC_ERROR_INVALIDUTF8;
+  *dst = uc;
+  return length;
+}
+
+bool utf8proc_codepoint_valid(int32_t uc) {
+  if (uc < 0 || uc >= 0x110000 ||
+    ((uc & 0xFFFF) >= 0xFFFE) || (uc >= 0xD800 && uc < 0xE000) ||
+    (uc >= 0xFDD0 && uc < 0xFDF0)) return false;
+  else return true;
+}
+
+ssize_t utf8proc_encode_char(int32_t uc, uint8_t *dst) {
+  if (uc < 0x00) {
+    return 0;
+  } else if (uc < 0x80) {
+    dst[0] = uc;
+    return 1;
+  } else if (uc < 0x800) {
+    dst[0] = 0xC0 + (uc >> 6);
+    dst[1] = 0x80 + (uc & 0x3F);
+    return 2;
+  } else if (uc == 0xFFFF) {
+    dst[0] = 0xFF;
+    return 1;
+  } else if (uc == 0xFFFE) {
+    dst[0] = 0xFE;
+    return 1;
+  } else if (uc < 0x10000) {
+    dst[0] = 0xE0 + (uc >> 12);
+    dst[1] = 0x80 + ((uc >> 6) & 0x3F);
+    dst[2] = 0x80 + (uc & 0x3F);
+    return 3;
+  } else if (uc < 0x110000) {
+    dst[0] = 0xF0 + (uc >> 18);
+    dst[1] = 0x80 + ((uc >> 12) & 0x3F);
+    dst[2] = 0x80 + ((uc >> 6) & 0x3F);
+    dst[3] = 0x80 + (uc & 0x3F);
+    return 4;
+  } else return 0;
+}
+
+const utf8proc_property_t *utf8proc_get_property(int32_t uc) {
+  /* ASSERT: uc >= 0 && uc < 0x110000 */
+  return utf8proc_properties + (
+    utf8proc_stage2table[
+      utf8proc_stage1table[uc >> 8] + (uc & 0xFF)
+    ]
+  );
+}
+
+#define utf8proc_decompose_lump(replacement_uc) \
+  return utf8proc_decompose_char((replacement_uc), dst, bufsize, \
+  options & ~UTF8PROC_LUMP, last_boundclass)
+
+ssize_t utf8proc_decompose_char(int32_t uc, int32_t *dst, ssize_t bufsize,
+    int options, int *last_boundclass) {
+  /* ASSERT: uc >= 0 && uc < 0x110000 */
+  const utf8proc_property_t *property;
+  utf8proc_propval_t category;
+  int32_t hangul_sindex;
+  property = utf8proc_get_property(uc);
+  category = property->category;
+  hangul_sindex = uc - UTF8PROC_HANGUL_SBASE;
+  if (options & (UTF8PROC_COMPOSE|UTF8PROC_DECOMPOSE)) {
+    if (hangul_sindex >= 0 && hangul_sindex < UTF8PROC_HANGUL_SCOUNT) {
+      int32_t hangul_tindex;
+      if (bufsize >= 1) {
+        dst[0] = UTF8PROC_HANGUL_LBASE +
+          hangul_sindex / UTF8PROC_HANGUL_NCOUNT;
+        if (bufsize >= 2) dst[1] = UTF8PROC_HANGUL_VBASE +
+          (hangul_sindex % UTF8PROC_HANGUL_NCOUNT) / UTF8PROC_HANGUL_TCOUNT;
+      }
+      hangul_tindex = hangul_sindex % UTF8PROC_HANGUL_TCOUNT;
+      if (!hangul_tindex) return 2;
+      if (bufsize >= 3) dst[2] = UTF8PROC_HANGUL_TBASE + hangul_tindex;
+      return 3;
+    }
+  }
+  if (options & UTF8PROC_REJECTNA) {
+    if (!category) return UTF8PROC_ERROR_NOTASSIGNED;
+  }
+  if (options & UTF8PROC_IGNORE) {
+    if (property->ignorable) return 0;
+  }
+  if (options & UTF8PROC_LUMP) {
+    if (category == UTF8PROC_CATEGORY_ZS) utf8proc_decompose_lump(0x0020);
+    if (uc == 0x2018 || uc == 0x2019 || uc == 0x02BC || uc == 0x02C8)
+      utf8proc_decompose_lump(0x0027);
+    if (category == UTF8PROC_CATEGORY_PD || uc == 0x2212)
+      utf8proc_decompose_lump(0x002D);
+    if (uc == 0x2044 || uc == 0x2215) utf8proc_decompose_lump(0x002F);
+    if (uc == 0x2236) utf8proc_decompose_lump(0x003A);
+    if (uc == 0x2039 || uc == 0x2329 || uc == 0x3008)
+      utf8proc_decompose_lump(0x003C);
+    if (uc == 0x203A || uc == 0x232A || uc == 0x3009)
+      utf8proc_decompose_lump(0x003E);
+    if (uc == 0x2216) utf8proc_decompose_lump(0x005C);
+    if (uc == 0x02C4 || uc == 0x02C6 || uc == 0x2038 || uc == 0x2303)
+      utf8proc_decompose_lump(0x005E);
+    if (category == UTF8PROC_CATEGORY_PC || uc == 0x02CD)
+      utf8proc_decompose_lump(0x005F);
+    if (uc == 0x02CB) utf8proc_decompose_lump(0x0060);
+    if (uc == 0x2223) utf8proc_decompose_lump(0x007C);
+    if (uc == 0x223C) utf8proc_decompose_lump(0x007E);
+    if ((options & UTF8PROC_NLF2LS) && (options & UTF8PROC_NLF2PS)) {
+      if (category == UTF8PROC_CATEGORY_ZL ||
+          category == UTF8PROC_CATEGORY_ZP)
+        utf8proc_decompose_lump(0x000A);
+    }
+  }
+  if (options & UTF8PROC_STRIPMARK) {
+    if (category == UTF8PROC_CATEGORY_MN ||
+      category == UTF8PROC_CATEGORY_MC ||
+      category == UTF8PROC_CATEGORY_ME) return 0;
+  }
+  if (options & UTF8PROC_CASEFOLD) {
+    if (property->casefold_mapping) {
+      const int32_t *casefold_entry;
+      ssize_t written = 0;
+      for (casefold_entry = property->casefold_mapping;
+          *casefold_entry >= 0; casefold_entry++) {
+        written += utf8proc_decompose_char(*casefold_entry, dst+written,
+          (bufsize > written) ? (bufsize - written) : 0, options,
+          last_boundclass);
+        if (written < 0) return UTF8PROC_ERROR_OVERFLOW;
+      }
+      return written;
+    }
+  }
+  if (options & (UTF8PROC_COMPOSE|UTF8PROC_DECOMPOSE)) {
+    if (property->decomp_mapping &&
+        (!property->decomp_type || (options & UTF8PROC_COMPAT))) {
+      const int32_t *decomp_entry;
+      ssize_t written = 0;
+      for (decomp_entry = property->decomp_mapping;
+          *decomp_entry >= 0; decomp_entry++) {
+        written += utf8proc_decompose_char(*decomp_entry, dst+written,
+          (bufsize > written) ? (bufsize - written) : 0, options,
+        last_boundclass);
+        if (written < 0) return UTF8PROC_ERROR_OVERFLOW;
+      }
+      return written;
+    }
+  }
+  if (options & UTF8PROC_CHARBOUND) {
+    bool boundary;
+    int tbc, lbc;
+    tbc =
+      (uc == 0x000D) ? UTF8PROC_BOUNDCLASS_CR :
+      (uc == 0x000A) ? UTF8PROC_BOUNDCLASS_LF :
+      ((category == UTF8PROC_CATEGORY_ZL ||
+        category == UTF8PROC_CATEGORY_ZP ||
+        category == UTF8PROC_CATEGORY_CC ||
+        category == UTF8PROC_CATEGORY_CF) &&
+        !(uc == 0x200C || uc == 0x200D)) ? UTF8PROC_BOUNDCLASS_CONTROL :
+      property->extend ? UTF8PROC_BOUNDCLASS_EXTEND :
+      ((uc >= UTF8PROC_HANGUL_L_START && uc < UTF8PROC_HANGUL_L_END) ||
+        uc == UTF8PROC_HANGUL_L_FILLER) ? UTF8PROC_BOUNDCLASS_L :
+      (uc >= UTF8PROC_HANGUL_V_START && uc < UTF8PROC_HANGUL_V_END) ?
+        UTF8PROC_BOUNDCLASS_V :
+      (uc >= UTF8PROC_HANGUL_T_START && uc < UTF8PROC_HANGUL_T_END) ?
+        UTF8PROC_BOUNDCLASS_T :
+      (uc >= UTF8PROC_HANGUL_S_START && uc < UTF8PROC_HANGUL_S_END) ? (
+        ((uc-UTF8PROC_HANGUL_SBASE) % UTF8PROC_HANGUL_TCOUNT == 0) ?
+          UTF8PROC_BOUNDCLASS_LV : UTF8PROC_BOUNDCLASS_LVT
+      ) :
+      UTF8PROC_BOUNDCLASS_OTHER;
+    lbc = *last_boundclass;
+    boundary =
+      (tbc == UTF8PROC_BOUNDCLASS_EXTEND) ? false :
+      (lbc == UTF8PROC_BOUNDCLASS_START) ? true :
+      (lbc == UTF8PROC_BOUNDCLASS_CR &&
+       tbc == UTF8PROC_BOUNDCLASS_LF) ? false :
+      (lbc == UTF8PROC_BOUNDCLASS_CONTROL) ? true :
+      (tbc == UTF8PROC_BOUNDCLASS_CONTROL) ? true :
+      (lbc == UTF8PROC_BOUNDCLASS_L &&
+       (tbc == UTF8PROC_BOUNDCLASS_L ||
+        tbc == UTF8PROC_BOUNDCLASS_V ||
+        tbc == UTF8PROC_BOUNDCLASS_LV ||
+        tbc == UTF8PROC_BOUNDCLASS_LVT)) ? false :
+      ((lbc == UTF8PROC_BOUNDCLASS_LV ||
+        lbc == UTF8PROC_BOUNDCLASS_V) &&
+       (tbc == UTF8PROC_BOUNDCLASS_V ||
+        tbc == UTF8PROC_BOUNDCLASS_T)) ? false :
+      ((lbc == UTF8PROC_BOUNDCLASS_LVT ||
+        lbc == UTF8PROC_BOUNDCLASS_T) &&
+       tbc == UTF8PROC_BOUNDCLASS_T) ? false :
+       true;
+    *last_boundclass = tbc;
+    if (boundary) {
+      if (bufsize >= 1) dst[0] = 0xFFFF;
+      if (bufsize >= 2) dst[1] = uc;
+      return 2;
+    }
+  }
+  if (bufsize >= 1) *dst = uc;
+  return 1;
+}
+
+ssize_t utf8proc_decompose(
+  const uint8_t *str, ssize_t strlen,
+  int32_t *buffer, ssize_t bufsize, int options
+) {
+  /* strlen will be ignored, if UTF8PROC_NULLTERM is set in options */
+  ssize_t wpos = 0;
+  if ((options & UTF8PROC_COMPOSE) && (options & UTF8PROC_DECOMPOSE))
+    return UTF8PROC_ERROR_INVALIDOPTS;
+  if ((options & UTF8PROC_STRIPMARK) &&
+      !(options & UTF8PROC_COMPOSE) && !(options & UTF8PROC_DECOMPOSE))
+    return UTF8PROC_ERROR_INVALIDOPTS;
+  {
+    int32_t uc;
+    ssize_t rpos = 0;
+    ssize_t decomp_result;
+    int boundclass = UTF8PROC_BOUNDCLASS_START;
+    while (1) {
+      if (options & UTF8PROC_NULLTERM) {
+        rpos += utf8proc_iterate(str + rpos, -1, &uc);
+        /* checking of return value is not neccessary,
+           as 'uc' is < 0 in case of error */
+        if (uc < 0) return UTF8PROC_ERROR_INVALIDUTF8;
+        if (rpos < 0) return UTF8PROC_ERROR_OVERFLOW;
+        if (uc == 0) break;
+      } else {
+        if (rpos >= strlen) break;
+        rpos += utf8proc_iterate(str + rpos, strlen - rpos, &uc);
+        if (uc < 0) return UTF8PROC_ERROR_INVALIDUTF8;
+      }
+      decomp_result = utf8proc_decompose_char(
+        uc, buffer + wpos, (bufsize > wpos) ? (bufsize - wpos) : 0, options,
+        &boundclass
+      );
+      if (decomp_result < 0) return decomp_result;
+      wpos += decomp_result;
+      /* prohibiting integer overflows due to too long strings: */
+      if (wpos < 0 || wpos > SSIZE_MAX/sizeof(int32_t)/2)
+        return UTF8PROC_ERROR_OVERFLOW;
+    }
+  }
+  if ((options & (UTF8PROC_COMPOSE|UTF8PROC_DECOMPOSE)) && bufsize >= wpos) {
+    ssize_t pos = 0;
+    while (pos < wpos-1) {
+      int32_t uc1, uc2;
+      const utf8proc_property_t *property1, *property2;
+      uc1 = buffer[pos];
+      uc2 = buffer[pos+1];
+      property1 = utf8proc_get_property(uc1);
+      property2 = utf8proc_get_property(uc2);
+      if (property1->combining_class > property2->combining_class &&
+          property2->combining_class > 0) {
+        buffer[pos] = uc2;
+        buffer[pos+1] = uc1;
+        if (pos > 0) pos--; else pos++;
+      } else {
+        pos++;
+      }
+    }
+  }
+  return wpos;
+}
+
+ssize_t utf8proc_reencode(int32_t *buffer, ssize_t length, int options) {
+  /* UTF8PROC_NULLTERM option will be ignored, 'length' is never ignored
+     ASSERT: 'buffer' has one spare byte of free space at the end! */
+  if (options & (UTF8PROC_NLF2LS | UTF8PROC_NLF2PS | UTF8PROC_STRIPCC)) {
+    ssize_t rpos;
+    ssize_t wpos = 0;
+    int32_t uc;
+    for (rpos = 0; rpos < length; rpos++) {
+      uc = buffer[rpos];
+      if (uc == 0x000D && rpos < length-1 && buffer[rpos+1] == 0x000A) rpos++;
+      if (uc == 0x000A || uc == 0x000D || uc == 0x0085 ||
+          ((options & UTF8PROC_STRIPCC) && (uc == 0x000B || uc == 0x000C))) {
+        if (options & UTF8PROC_NLF2LS) {
+          if (options & UTF8PROC_NLF2PS) {
+            buffer[wpos++] = 0x000A;
+          } else {
+            buffer[wpos++] = 0x2028;
+          }
+        } else {
+          if (options & UTF8PROC_NLF2PS) {
+            buffer[wpos++] = 0x2029;
+          } else {
+            buffer[wpos++] = 0x0020;
+          }
+        }
+      } else if ((options & UTF8PROC_STRIPCC) &&
+          (uc < 0x0020 || (uc >= 0x007F && uc < 0x00A0))) {
+        if (uc == 0x0009) buffer[wpos++] = 0x0020;
+      } else {
+        buffer[wpos++] = uc;
+      }
+    }
+    length = wpos;
+  }
+  if (options & UTF8PROC_COMPOSE) {
+    int32_t *starter = NULL;
+    int32_t current_char;
+    const utf8proc_property_t *starter_property = NULL, *current_property;
+    utf8proc_propval_t max_combining_class = -1;
+    ssize_t rpos;
+    ssize_t wpos = 0;
+    int32_t composition;
+    for (rpos = 0; rpos < length; rpos++) {
+      current_char = buffer[rpos];
+      current_property = utf8proc_get_property(current_char);
+      if (starter && current_property->combining_class > max_combining_class) {
+        /* combination perhaps possible */
+        int32_t hangul_lindex;
+        int32_t hangul_sindex;
+        hangul_lindex = *starter - UTF8PROC_HANGUL_LBASE;
+        if (hangul_lindex >= 0 && hangul_lindex < UTF8PROC_HANGUL_LCOUNT) {
+          int32_t hangul_vindex;
+          hangul_vindex = current_char - UTF8PROC_HANGUL_VBASE;
+          if (hangul_vindex >= 0 && hangul_vindex < UTF8PROC_HANGUL_VCOUNT) {
+            *starter = UTF8PROC_HANGUL_SBASE +
+              (hangul_lindex * UTF8PROC_HANGUL_VCOUNT + hangul_vindex) *
+              UTF8PROC_HANGUL_TCOUNT;
+            starter_property = NULL;
+            continue;
+          }
+        }
+        hangul_sindex = *starter - UTF8PROC_HANGUL_SBASE;
+        if (hangul_sindex >= 0 && hangul_sindex < UTF8PROC_HANGUL_SCOUNT &&
+            (hangul_sindex % UTF8PROC_HANGUL_TCOUNT) == 0) {
+          int32_t hangul_tindex;
+          hangul_tindex = current_char - UTF8PROC_HANGUL_TBASE;
+          if (hangul_tindex >= 0 && hangul_tindex < UTF8PROC_HANGUL_TCOUNT) {
+            *starter += hangul_tindex;
+            starter_property = NULL;
+            continue;
+          }
+        }
+        if (!starter_property) {
+          starter_property = utf8proc_get_property(*starter);
+        }
+        if (starter_property->comb1st_index >= 0 &&
+            current_property->comb2nd_index >= 0) {
+          composition = utf8proc_combinations[
+            starter_property->comb1st_index +
+            current_property->comb2nd_index
+          ];
+          if (composition >= 0 && (!(options & UTF8PROC_STABLE) ||
+              !(utf8proc_get_property(composition)->comp_exclusion))) {
+            *starter = composition;
+            starter_property = NULL;
+            continue;
+          }
+        }
+      }
+      buffer[wpos] = current_char;
+      if (current_property->combining_class) {
+        if (current_property->combining_class > max_combining_class) {
+          max_combining_class = current_property->combining_class;
+        }
+      } else {
+        starter = buffer + wpos;
+        starter_property = NULL;
+        max_combining_class = -1;
+      }
+      wpos++;
+    }
+    length = wpos;
+  }
+  {
+    ssize_t rpos, wpos = 0;
+    int32_t uc;
+    for (rpos = 0; rpos < length; rpos++) {
+      uc = buffer[rpos];
+      wpos += utf8proc_encode_char(uc, ((uint8_t *)buffer) + wpos);
+    }
+    ((uint8_t *)buffer)[wpos] = 0;
+    return wpos;
+  }
+}
+
+ssize_t utf8proc_map(
+  const uint8_t *str, ssize_t strlen, uint8_t **dstptr, int options
+) {
+  int32_t *buffer;
+  ssize_t result;
+  *dstptr = NULL;
+  result = utf8proc_decompose(str, strlen, NULL, 0, options);
+  if (result < 0) return result;
+  buffer = malloc(result * sizeof(int32_t) + 1);
+  if (!buffer) return UTF8PROC_ERROR_NOMEM;
+  result = utf8proc_decompose(str, strlen, buffer, result, options);
+  if (result < 0) {
+    free(buffer);
+    return result;
+  }
+  result = utf8proc_reencode(buffer, result, options);
+  if (result < 0) {
+    free(buffer);
+    return result;
+  }
+  {
+    int32_t *newptr;
+    newptr = realloc(buffer, (size_t)result+1);
+    if (newptr) buffer = newptr;
+  }
+  *dstptr = (uint8_t *)buffer;
+  return result;
+}
+
+uint8_t *utf8proc_NFD(const uint8_t *str) {
+  uint8_t *retval;
+  utf8proc_map(str, 0, &retval, UTF8PROC_NULLTERM | UTF8PROC_STABLE |
+    UTF8PROC_DECOMPOSE);
+  return retval;
+}
+
+uint8_t *utf8proc_NFC(const uint8_t *str) {
+  uint8_t *retval;
+  utf8proc_map(str, 0, &retval, UTF8PROC_NULLTERM | UTF8PROC_STABLE |
+    UTF8PROC_COMPOSE);
+  return retval;
+}
+
+uint8_t *utf8proc_NFKD(const uint8_t *str) {
+  uint8_t *retval;
+  utf8proc_map(str, 0, &retval, UTF8PROC_NULLTERM | UTF8PROC_STABLE |
+    UTF8PROC_DECOMPOSE | UTF8PROC_COMPAT);
+  return retval;
+}
+
+uint8_t *utf8proc_NFKC(const uint8_t *str) {
+  uint8_t *retval;
+  utf8proc_map(str, 0, &retval, UTF8PROC_NULLTERM | UTF8PROC_STABLE |
+    UTF8PROC_COMPOSE | UTF8PROC_COMPAT);
+  return retval;
+}
+