aboutsummaryrefslogtreecommitdiff
path: root/locale/programs/3level.h
blob: 19c7daf73113e7fabc75de550f1eed3c54317363 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
/* Copyright (C) 2000-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Bruno Haible <haible@clisp.cons.org>, 2000.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published
   by the Free Software Foundation; version 2 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.  */

#include <stdint.h>

/* Construction of sparse 3-level tables.
   See wchar-lookup.h or coll-lookup.h for their structure and the
   meaning of p and q.

   Before including this file, set
     TABLE        to the name of the structure to be defined
     ELEMENT      to the type of every entry
     DEFAULT      to the default value for empty entries
     ITERATE      if you want the TABLE_iterate function to be defined
     NO_ADD_LOCALE  if you don't want the add_locale_TABLE function
		    to be defined

   This will define

     struct TABLE;
     void TABLE_init (struct TABLE *t);
     ELEMENT TABLE_get (struct TABLE *t, uint32_t wc);
     void TABLE_add (struct TABLE *t, uint32_t wc, ELEMENT value);
     void TABLE_iterate (struct TABLE *t,
			 void (*fn) (uint32_t wc, ELEMENT value));
     void add_locale_TABLE (struct locale_file *file, struct TABLE *t);
*/

#define CONCAT(a,b) CONCAT1(a,b)
#define CONCAT1(a,b) a##b

struct TABLE
{
  /* Parameters.  */
  unsigned int p;
  unsigned int q;
  /* Working representation.  */
  size_t level1_alloc;
  size_t level1_size;
  uint32_t *level1;
  size_t level2_alloc;
  size_t level2_size;
  uint32_t *level2;
  size_t level3_alloc;
  size_t level3_size;
  ELEMENT *level3;
  /* Size of compressed representation.  */
  size_t result_size;
};

/* Initialize.  Assumes t->p and t->q have already been set.  */
static inline void
CONCAT(TABLE,_init) (struct TABLE *t)
{
  t->level1 = NULL;
  t->level1_alloc = t->level1_size = 0;
  t->level2 = NULL;
  t->level2_alloc = t->level2_size = 0;
  t->level3 = NULL;
  t->level3_alloc = t->level3_size = 0;
}

/* Marker for an empty slot.  This has the value 0xFFFFFFFF, regardless
   whether 'int' is 16 bit, 32 bit, or 64 bit.  */
#define EMPTY ((uint32_t) ~0)

/* Retrieve an entry.  */
static inline ELEMENT
__attribute ((always_inline))
CONCAT(TABLE,_get) (struct TABLE *t, uint32_t wc)
{
  uint32_t index1 = wc >> (t->q + t->p);
  if (index1 < t->level1_size)
    {
      uint32_t lookup1 = t->level1[index1];
      if (lookup1 != EMPTY)
	{
	  uint32_t index2 = ((wc >> t->p) & ((1 << t->q) - 1))
			    + (lookup1 << t->q);
	  uint32_t lookup2 = t->level2[index2];
	  if (lookup2 != EMPTY)
	    {
	      uint32_t index3 = (wc & ((1 << t->p) - 1))
				+ (lookup2 << t->p);
	      ELEMENT lookup3 = t->level3[index3];

	      return lookup3;
	    }
	}
    }
  return DEFAULT;
}

/* Add one entry.  */
static void
CONCAT(TABLE,_add) (struct TABLE *t, uint32_t wc, ELEMENT value)
{
  uint32_t index1 = wc >> (t->q + t->p);
  uint32_t index2 = (wc >> t->p) & ((1 << t->q) - 1);
  uint32_t index3 = wc & ((1 << t->p) - 1);
  size_t i, i1, i2;

  if (value == CONCAT(TABLE,_get) (t, wc))
    return;

  if (index1 >= t->level1_size)
    {
      if (index1 >= t->level1_alloc)
	{
	  size_t alloc = 2 * t->level1_alloc;
	  if (alloc <= index1)
	    alloc = index1 + 1;
	  t->level1 = (uint32_t *) xrealloc ((char *) t->level1,
					     alloc * sizeof (uint32_t));
	  t->level1_alloc = alloc;
	}
      while (index1 >= t->level1_size)
	t->level1[t->level1_size++] = EMPTY;
    }

  if (t->level1[index1] == EMPTY)
    {
      if (t->level2_size == t->level2_alloc)
	{
	  size_t alloc = 2 * t->level2_alloc + 1;
	  t->level2 = (uint32_t *) xrealloc ((char *) t->level2,
					     (alloc << t->q) * sizeof (uint32_t));
	  t->level2_alloc = alloc;
	}
      i1 = t->level2_size << t->q;
      i2 = (t->level2_size + 1) << t->q;
      for (i = i1; i < i2; i++)
	t->level2[i] = EMPTY;
      t->level1[index1] = t->level2_size++;
    }

  index2 += t->level1[index1] << t->q;

  if (t->level2[index2] == EMPTY)
    {
      if (t->level3_size == t->level3_alloc)
	{
	  size_t alloc = 2 * t->level3_alloc + 1;
	  t->level3 = (ELEMENT *) xrealloc ((char *) t->level3,
					    (alloc << t->p) * sizeof (ELEMENT));
	  t->level3_alloc = alloc;
	}
      i1 = t->level3_size << t->p;
      i2 = (t->level3_size + 1) << t->p;
      for (i = i1; i < i2; i++)
	t->level3[i] = DEFAULT;
      t->level2[index2] = t->level3_size++;
    }

  index3 += t->level2[index2] << t->p;

  t->level3[index3] = value;
}

#ifdef ITERATE
/* Apply a function to all entries in the table.  */
static void
CONCAT(TABLE,_iterate) (struct TABLE *t,
			void (*fn) (uint32_t wc, ELEMENT value))
{
  uint32_t index1;
  for (index1 = 0; index1 < t->level1_size; index1++)
    {
      uint32_t lookup1 = t->level1[index1];
      if (lookup1 != EMPTY)
	{
	  uint32_t lookup1_shifted = lookup1 << t->q;
	  uint32_t index2;
	  for (index2 = 0; index2 < (1 << t->q); index2++)
	    {
	      uint32_t lookup2 = t->level2[index2 + lookup1_shifted];
	      if (lookup2 != EMPTY)
		{
		  uint32_t lookup2_shifted = lookup2 << t->p;
		  uint32_t index3;
		  for (index3 = 0; index3 < (1 << t->p); index3++)
		    {
		      ELEMENT lookup3 = t->level3[index3 + lookup2_shifted];
		      if (lookup3 != DEFAULT)
			fn ((((index1 << t->q) + index2) << t->p) + index3,
			    lookup3);
		    }
		}
	    }
	}
    }
}
#endif

#ifndef NO_ADD_LOCALE
/* Finalize and shrink.  */
static void
CONCAT(add_locale_,TABLE) (struct locale_file *file, struct TABLE *t)
{
  size_t i, j, k;
  uint32_t reorder3[t->level3_size];
  uint32_t reorder2[t->level2_size];
  uint32_t level2_offset, level3_offset, last_offset;

  /* Uniquify level3 blocks.  */
  k = 0;
  for (j = 0; j < t->level3_size; j++)
    {
      for (i = 0; i < k; i++)
	if (memcmp (&t->level3[i << t->p], &t->level3[j << t->p],
		    (1 << t->p) * sizeof (ELEMENT)) == 0)
	  break;
      /* Relocate block j to block i.  */
      reorder3[j] = i;
      if (i == k)
	{
	  if (i != j)
	    memcpy (&t->level3[i << t->p], &t->level3[j << t->p],
		    (1 << t->p) * sizeof (ELEMENT));
	  k++;
	}
    }
  t->level3_size = k;

  for (i = 0; i < (t->level2_size << t->q); i++)
    if (t->level2[i] != EMPTY)
      t->level2[i] = reorder3[t->level2[i]];

  /* Uniquify level2 blocks.  */
  k = 0;
  for (j = 0; j < t->level2_size; j++)
    {
      for (i = 0; i < k; i++)
	if (memcmp (&t->level2[i << t->q], &t->level2[j << t->q],
		    (1 << t->q) * sizeof (uint32_t)) == 0)
	  break;
      /* Relocate block j to block i.  */
      reorder2[j] = i;
      if (i == k)
	{
	  if (i != j)
	    memcpy (&t->level2[i << t->q], &t->level2[j << t->q],
		    (1 << t->q) * sizeof (uint32_t));
	  k++;
	}
    }
  t->level2_size = k;

  for (i = 0; i < t->level1_size; i++)
    if (t->level1[i] != EMPTY)
      t->level1[i] = reorder2[t->level1[i]];

  /* Create and fill the resulting compressed representation.  */
  last_offset =
    5 * sizeof (uint32_t)
    + t->level1_size * sizeof (uint32_t)
    + (t->level2_size << t->q) * sizeof (uint32_t)
    + (t->level3_size << t->p) * sizeof (ELEMENT);
  t->result_size = LOCFILE_ALIGN_UP (last_offset);

  level2_offset =
    5 * sizeof (uint32_t)
    + t->level1_size * sizeof (uint32_t);
  level3_offset =
    5 * sizeof (uint32_t)
    + t->level1_size * sizeof (uint32_t)
    + (t->level2_size << t->q) * sizeof (uint32_t);

  start_locale_structure (file);
  add_locale_uint32 (file, t->q + t->p);
  add_locale_uint32 (file, t->level1_size);
  add_locale_uint32 (file, t->p);
  add_locale_uint32 (file, (1 << t->q) - 1);
  add_locale_uint32 (file, (1 << t->p) - 1);

  for (i = 0; i < t->level1_size; i++)
    add_locale_uint32
      (file,
       t->level1[i] == EMPTY
       ? 0
       : (t->level1[i] << t->q) * sizeof (uint32_t) + level2_offset);

  for (i = 0; i < (t->level2_size << t->q); i++)
    add_locale_uint32
      (file,
       t->level2[i] == EMPTY
       ? 0
       : (t->level2[i] << t->p) * sizeof (ELEMENT) + level3_offset);

  if (sizeof (ELEMENT) == 1)
    add_locale_raw_data (file, t->level3, t->level3_size << t->p);
  else if (sizeof (ELEMENT) == sizeof (uint32_t))
    add_locale_uint32_array (file, (uint32_t *) t->level3,
			     t->level3_size << t->p);
  else
    abort ();
  align_locale_data (file, LOCFILE_ALIGN);
  end_locale_structure (file);

  if (t->level1_alloc > 0)
    free (t->level1);
  if (t->level2_alloc > 0)
    free (t->level2);
  if (t->level3_alloc > 0)
    free (t->level3);
}
#endif

#undef EMPTY
#undef TABLE
#undef ELEMENT
#undef DEFAULT
#undef ITERATE
#undef NO_ADD_LOCALE