1/* Copyright (C) 2000, 2003 Free Software Foundation, Inc.
2   This file is part of the GNU C Library.
3   Contributed by Bruno Haible <haible@clisp.cons.org>, 2000.
4
5   The GNU C Library is free software; you can redistribute it and/or
6   modify it under the terms of the GNU Lesser General Public
7   License as published by the Free Software Foundation; either
8   version 2.1 of the License, or (at your option) any later version.
9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, write to the Free
17   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18   02111-1307 USA.  */
19
20#include <stdint.h>
21
22#ifndef internal_function
23#	define internal_function
24#endif
25
26/* Lookup in a table of int32_t, with default value 0.  */
27int32_t
28internal_function
29__collidx_table_lookup (const char *table, uint32_t wc)
30{
31  uint32_t shift1 = ((const uint32_t *) table)[0];
32  uint32_t index1 = wc >> shift1;
33  uint32_t bound = ((const uint32_t *) table)[1];
34  if (index1 < bound)
35    {
36      uint32_t lookup1 = ((const uint32_t *) table)[5 + index1];
37      if (lookup1 != 0)
38	{
39	  uint32_t shift2 = ((const uint32_t *) table)[2];
40	  uint32_t mask2 = ((const uint32_t *) table)[3];
41	  uint32_t index2 = (wc >> shift2) & mask2;
42	  uint32_t lookup2 = ((const uint32_t *)(table + lookup1))[index2];
43	  if (lookup2 != 0)
44	    {
45	      uint32_t mask3 = ((const uint32_t *) table)[4];
46	      uint32_t index3 = wc & mask3;
47	      int32_t lookup3 = ((const int32_t *)(table + lookup2))[index3];
48
49	      return lookup3;
50	    }
51	}
52    }
53  return 0;
54}
55
56
57/* Lookup in a table of uint32_t, with default value 0xffffffff.  */
58uint32_t
59internal_function
60__collseq_table_lookup (const char *table, uint32_t wc)
61{
62  uint32_t shift1 = ((const uint32_t *) table)[0];
63  uint32_t index1 = wc >> shift1;
64  uint32_t bound = ((const uint32_t *) table)[1];
65  if (index1 < bound)
66    {
67      uint32_t lookup1 = ((const uint32_t *) table)[5 + index1];
68      if (lookup1 != 0)
69	{
70	  uint32_t shift2 = ((const uint32_t *) table)[2];
71	  uint32_t mask2 = ((const uint32_t *) table)[3];
72	  uint32_t index2 = (wc >> shift2) & mask2;
73	  uint32_t lookup2 = ((const uint32_t *)(table + lookup1))[index2];
74	  if (lookup2 != 0)
75	    {
76	      uint32_t mask3 = ((const uint32_t *) table)[4];
77	      uint32_t index3 = wc & mask3;
78	      uint32_t lookup3 = ((const uint32_t *)(table + lookup2))[index3];
79
80	      return lookup3;
81	    }
82	}
83    }
84  return ~((uint32_t) 0);
85}
86