This file is indexed.

/usr/include/sofia-sip-1.12/sofia-sip/htable.h is in libsofia-sip-ua-dev 1.12.11+20110422.1-2ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
/*
 * This file is part of the Sofia-SIP package
 *
 * Copyright (C) 2005 Nokia Corporation.
 *
 * Contact: Pekka Pessi <pekka.pessi@nokia.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#ifndef HTABLE_H
/** Defined when <sofia-sip/htable.h> has been included. */
#define HTABLE_H

/**@ingroup su_htable
 * @file sofia-sip/htable.h
 *
 * Hash tables templates.
 *
 * This file contain a hash table template for C.  The hash tables are
 * resizeable, and they usually contain pointers to entries.  The
 * declaration for template datatypes is instantiated with macro
 * HTABLE_DECLARE().  The prototypes for hashing functions are instantiated
 * with macro HTABLE_PROTOS().  The implementation is instantiated with
 * macro HTABLE_BODIES().
 *
 * The hash table template is most efficient when the hash value is
 * precalculated and stored in each entry.  The hash "function" given to the
 * HTABLE_BODIES() would then be something like macro
 * @code
 * #define HTABLE_ENTRY_HASH(e) ((e)->e_hash_value)
 * @endcode
 *
 * When a entry with new identical hash key is added to the table, it can be
 * either @e inserted (before any other entry with same key value) or
 * @e appended.
 *
 * Example code can be found from <htable_test.c>.
 *
 * @author Pekka Pessi <Pekka.Pessi@nokia.com>
 *
 * @date Created: Tue Sep 25 17:42:40 2001 ppessi
 */

typedef unsigned long hash_value_t;

/** Minimum size of hash table */
#define HTABLE_MIN_SIZE 31

/** Declare hash table structure type.
 *
 * The macro HTABLE_DECLARE() expands to a declaration for hash table
 * structure.  The its typedef will be <em>prefix</em><code>_t</code>, the
 * field names start withb @a pr.  The entry type is @a entry_t.
 *
 * @param prefix  hash table type and function prefix
 * @param pr      hash table field prefix
 * @param entry_t entry type
 */
#define HTABLE_DECLARE(prefix, pr, entry_t)		\
  HTABLE_DECLARE_WITH(prefix, pr, entry_t, unsigned, hash_value_t)

#define HTABLE_DECLARE_WITH(prefix, pr, entry_t, size_t, hash_value_t)	\
  typedef struct prefix##_s {						\
    size_t pr##_size;							\
    size_t pr##_used;							\
    entry_t**pr##_table; /**< Hash table itself */			\
  } prefix##_t

#ifndef HTABLE_SCOPE
/** Default scope for hash table functions. */
#define HTABLE_SCOPE su_inline
#endif

/** Prototypes for hash table
 *
 * The macro HTABLE_PROTOS() expands to the prototypes of hash table
 * functions.  The function and type names start with @a prefix, the field
 * names start with @a pr.  The entry type is @a entry_t.
 *
 * @param prefix  hash table type and function prefix
 * @param pr      hash table field prefix
 * @param entry_t entry type
 */
#define HTABLE_PROTOS(prefix, pr, entry_t) \
  HTABLE_PROTOS_WITH(prefix, pr, entry_t, unsigned, hash_value_t)

#define HTABLE_PROTOS_WITH(prefix, pr, entry_t, size_t, hash_value_t)	\
HTABLE_SCOPE int prefix##_resize(su_home_t *, prefix##_t pr[1], size_t); \
HTABLE_SCOPE int prefix##_is_full(prefix##_t const *); \
HTABLE_SCOPE entry_t **prefix##_hash(prefix##_t const *, hash_value_t hv); \
HTABLE_SCOPE entry_t **prefix##_next(prefix##_t const *, entry_t * const *ee); \
HTABLE_SCOPE void prefix##_append(prefix##_t *pr, entry_t const *e); \
HTABLE_SCOPE void prefix##_insert(prefix##_t *pr, entry_t const *e); \
HTABLE_SCOPE int prefix##_remove(prefix##_t *, entry_t const *e)

/** Hash table implementation.
 *
 * The macro HTABLE_BODIES() expands the hash table functions.  The function
 * and type names start with @a prefix, the field names start with @a pr.
 * The entry type is @a entry_t.  The function (or macro) name returning
 * hash value of each entry is given as @a hfun.
 *
 * @param prefix  hash table type and function prefix
 * @param pr      hash table field prefix
 * @param entry_t entry type
 * @param hfun    function or macro returning hash value of entry
 */
#define HTABLE_BODIES(prefix, pr, entry_t, hfun) \
  HTABLE_BODIES_WITH(prefix, pr, entry_t, hfun, unsigned, hash_value_t)

#define HTABLE_BODIES_WITH(prefix, pr, entry_t, hfun, size_t, hash_value_t) \
/** Reallocate new hash table */ \
HTABLE_SCOPE \
int prefix##_resize(su_home_t *home, \
                    prefix##_t pr[], \
		    size_t new_size) \
{ \
  entry_t **new_hash; \
  entry_t **old_hash = pr->pr##_table; \
  size_t old_size; \
  size_t i, j, i0; \
  unsigned again = 0; \
  size_t used = 0, collisions = 0; \
\
  if (new_size == 0) \
    new_size = 2 * pr->pr##_size + 1; \
  if (new_size < HTABLE_MIN_SIZE) \
    new_size = HTABLE_MIN_SIZE; \
  if (new_size < 5 * pr->pr##_used / 4) \
    new_size = 5 * pr->pr##_used / 4; \
\
  if (!(new_hash = su_zalloc(home, sizeof(*new_hash) * new_size))) \
    return -1; \
\
  old_size = pr->pr##_size; \
\
  do for (j = 0; j < old_size; j++) { \
    if (!old_hash[j]) \
      continue; \
\
    if (again < 2 && hfun(old_hash[j]) % old_size > j) { \
      /* Wrapped, leave entry for second pass */ \
      again = 1; continue; \
    } \
\
    i0 = hfun(old_hash[j]) % new_size; \
\
    for (i = i0; new_hash[i]; i = (i + 1) % new_size, assert(i != i0)) \
      collisions++; \
\
    new_hash[i] = old_hash[j], old_hash[j] = NULL; \
    used++; \
  } \
  while (again++ == 1); \
\
  pr->pr##_table = new_hash, pr->pr##_size = new_size; \
\
  assert(pr->pr##_used == used); \
\
  su_free(home, old_hash); \
\
  return 0; \
} \
\
HTABLE_SCOPE \
int prefix##_is_full(prefix##_t const *pr) \
{ \
  return pr->pr##_table == NULL || 3 * pr->pr##_used > 2 * pr->pr##_size; \
} \
\
HTABLE_SCOPE \
entry_t **prefix##_hash(prefix##_t const *pr, hash_value_t hv) \
{ \
  return pr->pr##_table + hv % pr->pr##_size; \
} \
\
HTABLE_SCOPE \
entry_t **prefix##_next(prefix##_t const *pr, entry_t * const *ee) \
{ \
  if (++ee < pr->pr##_table + pr->pr##_size && ee >= pr->pr##_table) \
    return (entry_t **)ee; \
  else \
    return pr->pr##_table; \
}  \
\
HTABLE_SCOPE \
void prefix##_append(prefix##_t *pr, entry_t const *e) \
{ \
  entry_t **ee; \
\
  pr->pr##_used++; \
  for (ee = prefix##_hash(pr, hfun(e)); *ee; ee = prefix##_next(pr, ee)) \
   ; \
  *ee = (entry_t *)e; \
} \
\
HTABLE_SCOPE \
void prefix##_insert(prefix##_t *pr, entry_t const *e) \
{ \
  entry_t *e0, **ee; \
\
  pr->pr##_used++; \
  /* Insert entry into hash table (before other entries with same hash) */ \
  for (ee = prefix##_hash(pr, hfun(e));  \
       (e0 = *ee); \
       ee = prefix##_next(pr, ee)) \
    *ee = (entry_t *)e, e = e0; \
  *ee = (entry_t *)e; \
} \
\
HTABLE_SCOPE \
int prefix##_remove(prefix##_t *pr, entry_t const *e) \
{ \
  size_t i, j, k; \
  size_t size = pr->pr##_size; \
  entry_t **htable = pr->pr##_table; \
\
  if (!e) return -1; \
\
  /* Search for entry */ \
  for (i = hfun(e) % size; htable[i]; i = (i + 1) % size) \
    if (e == htable[i]) \
      break; \
\
  /* Entry is not in table? */ \
  if (!htable[i]) return -1; \
\
  /* Move table entries towards their primary place  */ \
  for (j = (i + 1) % size; htable[j]; j = (j + 1) % size) { \
    /* k is primary place for entry */ \
    k = hfun(htable[j]) % size; \
    if (k == j)			/* entry is in its primary place? */ \
      continue; \
    /* primary place is between i and j - do not move this to i */ \
    if (j > i ? (i < k && k < j) : (i < k || k < j)) \
      continue; \
\
    htable[i] = htable[j], i = j; \
  } \
\
  pr->pr##_used--; \
\
  htable[i] = NULL; \
\
  return 0; \
} \
extern int prefix##_dummy

#endif /** !defined(HTABLE_H) */