GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/lhash/lhash.c Lines: 163 185 88.1 %
Date: 2017-11-13 Branches: 56 70 80.0 %

Line Branch Exec Source
1
/* $OpenBSD: lhash.c,v 1.18 2016/11/08 20:20:06 miod Exp $ */
2
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3
 * All rights reserved.
4
 *
5
 * This package is an SSL implementation written
6
 * by Eric Young (eay@cryptsoft.com).
7
 * The implementation was written so as to conform with Netscapes SSL.
8
 *
9
 * This library is free for commercial and non-commercial use as long as
10
 * the following conditions are aheared to.  The following conditions
11
 * apply to all code found in this distribution, be it the RC4, RSA,
12
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13
 * included with this distribution is covered by the same copyright terms
14
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15
 *
16
 * Copyright remains Eric Young's, and as such any Copyright notices in
17
 * the code are not to be removed.
18
 * If this package is used in a product, Eric Young should be given attribution
19
 * as the author of the parts of the library used.
20
 * This can be in the form of a textual message at program startup or
21
 * in documentation (online or textual) provided with the package.
22
 *
23
 * Redistribution and use in source and binary forms, with or without
24
 * modification, are permitted provided that the following conditions
25
 * are met:
26
 * 1. Redistributions of source code must retain the copyright
27
 *    notice, this list of conditions and the following disclaimer.
28
 * 2. Redistributions in binary form must reproduce the above copyright
29
 *    notice, this list of conditions and the following disclaimer in the
30
 *    documentation and/or other materials provided with the distribution.
31
 * 3. All advertising materials mentioning features or use of this software
32
 *    must display the following acknowledgement:
33
 *    "This product includes cryptographic software written by
34
 *     Eric Young (eay@cryptsoft.com)"
35
 *    The word 'cryptographic' can be left out if the rouines from the library
36
 *    being used are not cryptographic related :-).
37
 * 4. If you include any Windows specific code (or a derivative thereof) from
38
 *    the apps directory (application code) you must include an acknowledgement:
39
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40
 *
41
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51
 * SUCH DAMAGE.
52
 *
53
 * The licence and distribution terms for any publically available version or
54
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55
 * copied and put under another distribution licence
56
 * [including the GNU Public Licence.]
57
 */
58
59
/* Code for dynamic hash table routines
60
 * Author - Eric Young v 2.0
61
 *
62
 * 2.2 eay - added #include "crypto.h" so the memory leak checking code is
63
 *	     present. eay 18-Jun-98
64
 *
65
 * 2.1 eay - Added an 'error in last operation' flag. eay 6-May-98
66
 *
67
 * 2.0 eay - Fixed a bug that occurred when using lh_delete
68
 *	     from inside lh_doall().  As entries were deleted,
69
 *	     the 'table' was 'contract()ed', making some entries
70
 *	     jump from the end of the table to the start, there by
71
 *	     skipping the lh_doall() processing. eay - 4/12/95
72
 *
73
 * 1.9 eay - Fixed a memory leak in lh_free, the LHASH_NODEs
74
 *	     were not being free()ed. 21/11/95
75
 *
76
 * 1.8 eay - Put the stats routines into a separate file, lh_stats.c
77
 *	     19/09/95
78
 *
79
 * 1.7 eay - Removed the fputs() for realloc failures - the code
80
 *           should silently tolerate them.  I have also fixed things
81
 *           lint complained about 04/05/95
82
 *
83
 * 1.6 eay - Fixed an invalid pointers in contract/expand 27/07/92
84
 *
85
 * 1.5 eay - Fixed a misuse of realloc in expand 02/03/1992
86
 *
87
 * 1.4 eay - Fixed lh_doall so the function can call lh_delete 28/05/91
88
 *
89
 * 1.3 eay - Fixed a few lint problems 19/3/1991
90
 *
91
 * 1.2 eay - Fixed lh_doall problem 13/3/1991
92
 *
93
 * 1.1 eay - Added lh_doall
94
 *
95
 * 1.0 eay - First version
96
 */
97
#include <stdio.h>
98
#include <string.h>
99
#include <stdlib.h>
100
101
#include <openssl/opensslconf.h>
102
103
#include <openssl/crypto.h>
104
#include <openssl/lhash.h>
105
106
#undef MIN_NODES
107
#define MIN_NODES	16
108
#define UP_LOAD		(2*LH_LOAD_MULT) /* load times 256  (default 2) */
109
#define DOWN_LOAD	(LH_LOAD_MULT)   /* load times 256  (default 1) */
110
111
static void expand(_LHASH *lh);
112
static void contract(_LHASH *lh);
113
static LHASH_NODE **getrn(_LHASH *lh, const void *data, unsigned long *rhash);
114
115
_LHASH *
116
lh_new(LHASH_HASH_FN_TYPE h, LHASH_COMP_FN_TYPE c)
117
{
118
	_LHASH *ret;
119
	int i;
120
121
31286
	if ((ret = malloc(sizeof(_LHASH))) == NULL)
122
		goto err0;
123
15643
	if ((ret->b = reallocarray(NULL, MIN_NODES, sizeof(LHASH_NODE *))) == NULL)
124
		goto err1;
125
531862
	for (i = 0; i < MIN_NODES; i++)
126
250288
		ret->b[i] = NULL;
127
15643
	ret->comp = ((c == NULL) ? (LHASH_COMP_FN_TYPE)strcmp : c);
128
15643
	ret->hash = ((h == NULL) ? (LHASH_HASH_FN_TYPE)lh_strhash : h);
129
15643
	ret->num_nodes = MIN_NODES / 2;
130
15643
	ret->num_alloc_nodes = MIN_NODES;
131
15643
	ret->p = 0;
132
15643
	ret->pmax = MIN_NODES / 2;
133
15643
	ret->up_load = UP_LOAD;
134
15643
	ret->down_load = DOWN_LOAD;
135
15643
	ret->num_items = 0;
136
137
15643
	ret->num_expands = 0;
138
15643
	ret->num_expand_reallocs = 0;
139
15643
	ret->num_contracts = 0;
140
15643
	ret->num_contract_reallocs = 0;
141
15643
	ret->num_hash_calls = 0;
142
15643
	ret->num_comp_calls = 0;
143
15643
	ret->num_insert = 0;
144
15643
	ret->num_replace = 0;
145
15643
	ret->num_delete = 0;
146
15643
	ret->num_no_delete = 0;
147
15643
	ret->num_retrieve = 0;
148
15643
	ret->num_retrieve_miss = 0;
149
15643
	ret->num_hash_comps = 0;
150
151
15643
	ret->error = 0;
152
15643
	return (ret);
153
154
err1:
155
	free(ret);
156
err0:
157
	return (NULL);
158
15643
}
159
160
void
161
lh_free(_LHASH *lh)
162
{
163
	unsigned int i;
164
	LHASH_NODE *n, *nn;
165
166
19808
	if (lh == NULL)
167
		return;
168
169
2996986
	for (i = 0; i < lh->num_nodes; i++) {
170
1488589
		n = lh->b[i];
171
8004420
		while (n != NULL) {
172
2513621
			nn = n->next;
173
2513621
			free(n);
174
			n = nn;
175
		}
176
	}
177
9904
	free(lh->b);
178
9904
	free(lh);
179
19808
}
180
181
void *
182
lh_insert(_LHASH *lh, void *data)
183
{
184
73251100
	unsigned long hash;
185
	LHASH_NODE *nn, **rn;
186
	void *ret;
187
188
36625550
	lh->error = 0;
189
36625550
	if (lh->up_load <= (lh->num_items * LH_LOAD_MULT / lh->num_nodes))
190
2450603
		expand(lh);
191
192
36625550
	rn = getrn(lh, data, &hash);
193
194
36625550
	if (*rn == NULL) {
195
5029898
		if ((nn = malloc(sizeof(LHASH_NODE))) == NULL) {
196
			lh->error++;
197
			return (NULL);
198
		}
199
5029898
		nn->data = data;
200
5029898
		nn->next = NULL;
201
#ifndef OPENSSL_NO_HASH_COMP
202
5029898
		nn->hash = hash;
203
#endif
204
5029898
		*rn = nn;
205
		ret = NULL;
206
5029898
		lh->num_insert++;
207
		lh->num_items++;
208
5029898
	}
209
	else /* replace same key */
210
	{
211
31595652
		ret = (*rn)->data;
212
31595652
		(*rn)->data = data;
213
31595652
		lh->num_replace++;
214
	}
215
36625550
	return (ret);
216
36625550
}
217
218
void *
219
lh_delete(_LHASH *lh, const void *data)
220
{
221
783042
	unsigned long hash;
222
	LHASH_NODE *nn, **rn;
223
	void *ret;
224
225
391521
	lh->error = 0;
226
391521
	rn = getrn(lh, data, &hash);
227
228
391521
	if (*rn == NULL) {
229
		lh->num_no_delete++;
230
		return (NULL);
231
	} else {
232
		nn= *rn;
233
391521
		*rn = nn->next;
234
391521
		ret = nn->data;
235
391521
		free(nn);
236
391521
		lh->num_delete++;
237
	}
238
239
391521
	lh->num_items--;
240

774198
	if ((lh->num_nodes > MIN_NODES) &&
241
382677
	    (lh->down_load >= (lh->num_items * LH_LOAD_MULT / lh->num_nodes)))
242
1568
		contract(lh);
243
244
391521
	return (ret);
245
391521
}
246
247
void *
248
lh_retrieve(_LHASH *lh, const void *data)
249
{
250
729018
	unsigned long hash;
251
	LHASH_NODE **rn;
252
	void *ret;
253
254
364509
	lh->error = 0;
255
364509
	rn = getrn(lh, data, &hash);
256
257
364509
	if (*rn == NULL) {
258
93923
		lh->num_retrieve_miss++;
259
93923
		return (NULL);
260
	} else {
261
270586
		ret = (*rn)->data;
262
270586
		lh->num_retrieve++;
263
	}
264
270586
	return (ret);
265
364509
}
266
267
static void
268
doall_util_fn(_LHASH *lh, int use_arg, LHASH_DOALL_FN_TYPE func,
269
    LHASH_DOALL_ARG_FN_TYPE func_arg, void *arg)
270
{
271
	int i;
272
	LHASH_NODE *a, *n;
273
274
20174
	if (lh == NULL)
275
28
		return;
276
277
	/* reverse the order so we search from 'top to bottom'
278
	 * We were having memory leaks otherwise */
279
1261474
	for (i = lh->num_nodes - 1; i >= 0; i--) {
280
620678
		a = lh->b[i];
281
2234776
		while (a != NULL) {
282
			/* 28/05/91 - eay - n added so items can be deleted
283
			 * via lh_doall */
284
			/* 22/05/08 - ben - eh? since a is not passed,
285
			 * this should not be needed */
286
496710
			n = a->next;
287
496710
			if (use_arg)
288
20974
				func_arg(a->data, arg);
289
			else
290
475736
				func(a->data);
291
			a = n;
292
		}
293
	}
294
20146
}
295
296
void
297
lh_doall(_LHASH *lh, LHASH_DOALL_FN_TYPE func)
298
{
299
15696
	doall_util_fn(lh, 0, func, (LHASH_DOALL_ARG_FN_TYPE)0, NULL);
300
7848
}
301
302
void
303
lh_doall_arg(_LHASH *lh, LHASH_DOALL_ARG_FN_TYPE func, void *arg)
304
{
305
4478
	doall_util_fn(lh, 1, (LHASH_DOALL_FN_TYPE)0, func, arg);
306
2239
}
307
308
static void
309
expand(_LHASH *lh)
310
{
311
	LHASH_NODE **n, **n1, **n2, *np;
312
	unsigned int p, i, j;
313
	unsigned long hash, nni;
314
315
4901206
	lh->num_nodes++;
316
2450603
	lh->num_expands++;
317
2450603
	p = (int)lh->p++;
318
2450603
	n1 = &(lh->b[p]);
319
2450603
	n2 = &(lh->b[p + (int)lh->pmax]);
320
2450603
	*n2 = NULL;        /* 27/07/92 - eay - undefined pointer bug */
321
2450603
	nni = lh->num_alloc_nodes;
322
323
21949368
	for (np = *n1; np != NULL; ) {
324
#ifndef OPENSSL_NO_HASH_COMP
325
8524081
		hash = np->hash;
326
#else
327
		hash = lh->hash(np->data);
328
		lh->num_hash_calls++;
329
#endif
330
8524081
		if ((hash % nni) != p) { /* move it */
331
1525686
			*n1 = (*n1)->next;
332
1525686
			np->next= *n2;
333
1525686
			*n2 = np;
334
1525686
		} else
335
			n1 = &((*n1)->next);
336
8524081
		np= *n1;
337
	}
338
339
2450603
	if ((lh->p) >= lh->pmax) {
340
28874
		j = (int)lh->num_alloc_nodes * 2;
341
28874
		n = reallocarray(lh->b, j, sizeof(LHASH_NODE *));
342
28874
		if (n == NULL) {
343
/*			fputs("realloc error in lhash", stderr); */
344
			lh->error++;
345
			lh->p = 0;
346
			return;
347
		}
348
		/* else */
349
6832948
		for (i = (int)lh->num_alloc_nodes; i < j; i++)/* 26/02/92 eay */
350
3387600
			n[i] = NULL;			  /* 02/03/92 eay */
351
28874
		lh->pmax = lh->num_alloc_nodes;
352
28874
		lh->num_alloc_nodes = j;
353
28874
		lh->num_expand_reallocs++;
354
28874
		lh->p = 0;
355
28874
		lh->b = n;
356
28874
	}
357
4901206
}
358
359
static void
360
contract(_LHASH *lh)
361
{
362
	LHASH_NODE **n, *n1, *np;
363
364
3136
	np = lh->b[lh->p + lh->pmax - 1];
365
1568
	lh->b[lh->p+lh->pmax - 1] = NULL; /* 24/07-92 - eay - weird but :-( */
366
1568
	if (lh->p == 0) {
367
		n = reallocarray(lh->b, lh->pmax, sizeof(LHASH_NODE *));
368
		if (n == NULL) {
369
/*			fputs("realloc error in lhash", stderr); */
370
			lh->error++;
371
			return;
372
		}
373
		lh->num_contract_reallocs++;
374
		lh->num_alloc_nodes /= 2;
375
		lh->pmax /= 2;
376
		lh->p = lh->pmax - 1;
377
		lh->b = n;
378
	} else
379
1568
		lh->p--;
380
381
1568
	lh->num_nodes--;
382
1568
	lh->num_contracts++;
383
384
1568
	n1 = lh->b[(int)lh->p];
385
1568
	if (n1 == NULL)
386
1568
		lh->b[(int)lh->p] = np;
387
	else {
388
		while (n1->next != NULL)
389
			n1 = n1->next;
390
		n1->next = np;
391
	}
392
3136
}
393
394
static LHASH_NODE **getrn(_LHASH *lh, const void *data, unsigned long *rhash)
395
{
396
	LHASH_NODE **ret, *n1;
397
	unsigned long hash, nn;
398
	LHASH_COMP_FN_TYPE cf;
399
400
74763160
	hash = (*(lh->hash))(data);
401
37381580
	lh->num_hash_calls++;
402
37381580
	*rhash = hash;
403
404
37381580
	nn = hash % lh->pmax;
405
37381580
	if (nn < lh->p)
406
16141570
		nn = hash % lh->num_alloc_nodes;
407
408
37381580
	cf = lh->comp;
409
37381580
	ret = &(lh->b[(int)nn]);
410
142659248
	for (n1 = *ret; n1 != NULL; n1 = n1->next) {
411
#ifndef OPENSSL_NO_HASH_COMP
412
66205803
		lh->num_hash_comps++;
413
66205803
		if (n1->hash != hash) {
414
31842301
			ret = &(n1->next);
415
31842301
			continue;
416
		}
417
#endif
418
34363502
		lh->num_comp_calls++;
419
34363502
		if (cf(n1->data, data) == 0)
420
			break;
421
2105743
		ret = &(n1->next);
422
2105743
	}
423
37381580
	return (ret);
424
}
425
426
/* The following hash seems to work very well on normal text strings
427
 * no collisions on /usr/dict/words and it distributes on %2^n quite
428
 * well, not as good as MD5, but still good.
429
 */
430
unsigned long
431
lh_strhash(const char *c)
432
{
433
	unsigned long ret = 0;
434
	unsigned long n, v;
435
	unsigned int r;
436
437

3969692
	if (c == NULL || *c == '\0')
438
6511
		return ret;
439
440
	n = 0x100;
441
30028542
	while (*c) {
442
13695381
		v = n | *c;
443
13695381
		n += 0x100;
444
13695381
		if ((r = ((v >> 2) ^ v) & 0x0f) != 0)
445
13693167
			ret = (ret << r) | (ret >> (32 - r));
446
13695381
		ret &= 0xFFFFFFFFUL;
447
13695381
		ret ^= v * v;
448
13695381
		c++;
449
	}
450
1318890
	return (ret >> 16) ^ ret;
451
1325401
}
452
453
unsigned long
454
lh_num_items(const _LHASH *lh)
455
{
456
6288
	return lh ? lh->num_items : 0;
457
}