+
−/* Canonical composition of Unicode characters.
+
−   Copyright (C) 2002, 2006, 2009 Free Software Foundation, Inc.
+
−   Written by Bruno Haible <bruno@clisp.org>, 2009.
+
−
+
−   This program is free software: you can redistribute it and/or modify it
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−   under the terms of the GNU Lesser General Public License as published
+
−   by the Free Software Foundation; either version 3 of the License, or
+
−   (at your option) any later version.
+
−
+
−   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
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−   Lesser General Public License for more details.
+
−
+
−   You should have received a copy of the GNU Lesser General Public License
+
−   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
−
+
−#include <config.h>
+
−
+
−/* Specification.  */
+
−#include "uninorm.h"
+
−
+
−#include <string.h>
+
−
+
−struct composition_rule { char codes[4]; unsigned short combined; };
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−
+
−#include "composition-table.h"
+
−
+
−ucs4_t
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−uc_composition (ucs4_t uc1, ucs4_t uc2)
+
−{
+
−  if (uc1 < 0x10000 && uc2 < 0x10000)
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−    {
+
−      if (uc2 >= 0x1161 && uc2 < 0x1161 + 21
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−	  && uc1 >= 0x1100 && uc1 < 0x1100 + 19)
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−	{
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−	  /* Hangul: Combine single letter L and single letter V to form
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−	     two-letter syllable LV.  */
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−	  return 0xAC00 + ((uc1 - 0x1100) * 21 + (uc2 - 0x1161)) * 28;
+
−	}
+
−      else if (uc2 > 0x11A7 && uc2 < 0x11A7 + 28
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−	       && uc1 >= 0xAC00 && uc1 < 0xD7A4 && ((uc1 - 0xAC00) % 28) == 0)
+
−	{
+
−	  /* Hangul: Combine two-letter syllable LV with single-letter T
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−	     to form three-letter syllable LVT.  */
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−	  return uc1 + (uc2 - 0x11A7);
+
−	}
+
−      else
+
−	{
+
−#if 0
+
−	  unsigned int uc = MUL1 * uc1 * MUL2 * uc2;
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−	  unsigned int index1 = uc >> composition_header_0;
+
−	  if (index1 < composition_header_1)
+
−	    {
+
−	      int lookup1 = u_composition.level1[index1];
+
−	      if (lookup1 >= 0)
+
−		{
+
−		  unsigned int index2 = (uc >> composition_header_2) & composition_header_3;
+
−		  int lookup2 = u_composition.level2[lookup1 + index2];
+
−		  if (lookup2 >= 0)
+
−		    {
+
−		      unsigned int index3 = (uc & composition_header_4);
+
−		      unsigned int lookup3 = u_composition.level3[lookup2 + index3];
+
−		      if ((lookup3 >> 16) == uc2)
+
−			return lookup3 & ((1U << 16) - 1);
+
−		    }
+
−		}
+
−	    }
+
−#else
+
−	  char codes[4];
+
−	  const struct composition_rule *rule;
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−
+
−	  codes[0] = (uc1 >> 8) & 0xff;
+
−	  codes[1] = uc1 & 0xff;
+
−	  codes[2] = (uc2 >> 8) & 0xff;
+
−	  codes[3] = uc2 & 0xff;
+
−
+
−	  rule = gl_uninorm_compose_lookup (codes, 4);
+
−	  if (rule != NULL)
+
−	    return rule->combined;
+
−#endif
+
−	}
+
−    }
+
−  return 0;
+
−}