114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/*
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* Copyright (C) 2009 Red Hat, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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*/
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#include "hb-private.h"
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#include "hb-language.h"
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static const char canon_map[256] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '-', 0, 0,
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 0, 0, 0, 0, 0, 0,
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'-', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 0, 0, 0, 0, '-',
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0, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 0, 0, 0, 0, 0
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};
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static hb_bool_t
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lang_equal (const void *v1,
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const void *v2)
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{
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const unsigned char *p1 = v1;
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const unsigned char *p2 = v2;
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while (canon_map[*p1] && canon_map[*p1] == canon_map[*p2])
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{
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p1++, p2++;
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}
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return (canon_map[*p1] == canon_map[*p2]);
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}
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#if 0
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static unsigned int
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lang_hash (const void *key)
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{
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const unsigned char *p = key;
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unsigned int h = 0;
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while (canon_map[*p])
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{
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h = (h << 5) - h + canon_map[*p];
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p++;
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}
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return h;
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}
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#endif
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hb_language_t
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hb_language_from_string (const char *str)
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{
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static unsigned int num_langs;
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static unsigned int num_alloced;
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static const char **langs;
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unsigned int i;
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unsigned char *p;
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/* TODO Use a hash table or something */
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if (!str)
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return NULL;
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for (i = 0; i < num_langs; i++)
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if (lang_equal (str, langs[i]))
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return langs[i];
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if (HB_UNLIKELY (num_langs == num_alloced)) {
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unsigned int new_alloced = 2 * (8 + num_alloced);
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const char **new_langs = realloc (langs, new_alloced * sizeof (langs[0]));
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if (!new_langs)
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return NULL;
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num_alloced = new_alloced;
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langs = new_langs;
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}
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langs[i] = strdup (str);
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for (p = (unsigned char *) langs[i]; *p; p++)
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*p = canon_map[*p];
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return (hb_language_t) langs[i];
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}
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const char *
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hb_language_to_string (hb_language_t language)
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{
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return (const char *) language;
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}
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