diff options
author | Benny Prijono <bennylp@teluu.com> | 2005-11-13 19:40:44 +0000 |
---|---|---|
committer | Benny Prijono <bennylp@teluu.com> | 2005-11-13 19:40:44 +0000 |
commit | a08b589d09d5197f9a76d549a189e4686bd2ca8c (patch) | |
tree | 549904e7680dfab96b3ce579b1843c5d58107100 /pjlib/src/pj/hash.c | |
parent | 8df70c6d5fef443506618bf31b686d53fef3f259 (diff) |
Applying license to pjproject
git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@49 74dad513-b988-da41-8d7b-12977e46ad98
Diffstat (limited to 'pjlib/src/pj/hash.c')
-rw-r--r-- | pjlib/src/pj/hash.c | 508 |
1 files changed, 265 insertions, 243 deletions
diff --git a/pjlib/src/pj/hash.c b/pjlib/src/pj/hash.c index 195c8817..499032cb 100644 --- a/pjlib/src/pj/hash.c +++ b/pjlib/src/pj/hash.c @@ -1,55 +1,77 @@ -/* $Id$ - */ -#include <pj/hash.h> -#include <pj/log.h> -#include <pj/string.h> -#include <pj/pool.h> -#include <pj/os.h> - -/** - * The hash multiplier used to calculate hash value. - */ -#define PJ_HASH_MULTIPLIER 33 - - -struct pj_hash_entry -{ - struct pj_hash_entry *next; - const void *key; - pj_uint32_t hash; - pj_uint32_t keylen; - void *value; -}; - - -struct pj_hash_table_t -{ - pj_hash_entry **table; - unsigned count, rows; - pj_hash_iterator_t iterator; -}; - - - -PJ_DEF(pj_uint32_t) pj_hash_calc(pj_uint32_t hash, const void *key, unsigned keylen) -{ - PJ_CHECK_STACK(); - - if (keylen==PJ_HASH_KEY_STRING) { - const unsigned char *p = key; - for ( ; *p; ++p ) { - hash = hash * PJ_HASH_MULTIPLIER + *p; - } - keylen = p - (const unsigned char*)key; - } else { - const unsigned char *p = key, - *end = p + keylen; - for ( ; p!=end; ++p) { - hash = hash * PJ_HASH_MULTIPLIER + *p; - } - } - return hash; -} +/* $Id$
+ */
+/*
+ * PJLIB - PJ Foundation Library
+ * (C)2003-2005 Benny Prijono <bennylp@bulukucing.org>
+ *
+ * Author:
+ * Benny Prijono <bennylp@bulukucing.org>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <pj/hash.h>
+#include <pj/log.h>
+#include <pj/string.h>
+#include <pj/pool.h>
+#include <pj/os.h>
+#include <pj/ctype.h>
+
+/**
+ * The hash multiplier used to calculate hash value.
+ */
+#define PJ_HASH_MULTIPLIER 33
+
+
+struct pj_hash_entry
+{
+ struct pj_hash_entry *next;
+ const void *key;
+ pj_uint32_t hash;
+ pj_uint32_t keylen;
+ void *value;
+};
+
+
+struct pj_hash_table_t
+{
+ pj_hash_entry **table;
+ unsigned count, rows;
+ pj_hash_iterator_t iterator;
+};
+
+
+
+PJ_DEF(pj_uint32_t) pj_hash_calc(pj_uint32_t hash, const void *key, unsigned keylen)
+{
+ PJ_CHECK_STACK();
+
+ if (keylen==PJ_HASH_KEY_STRING) {
+ const unsigned char *p = key;
+ for ( ; *p; ++p ) {
+ hash = hash * PJ_HASH_MULTIPLIER + *p;
+ }
+ keylen = p - (const unsigned char*)key;
+ } else {
+ const unsigned char *p = key,
+ *end = p + keylen;
+ for ( ; p!=end; ++p) {
+ hash = hash * PJ_HASH_MULTIPLIER + *p;
+ }
+ }
+ return hash;
+}
PJ_DEF(pj_uint32_t) pj_hash_calc_tolower( pj_uint32_t hval,
char *result,
@@ -64,194 +86,194 @@ PJ_DEF(pj_uint32_t) pj_hash_calc_tolower( pj_uint32_t hval, return hval;
}
- - -PJ_DEF(pj_hash_table_t*) pj_hash_create(pj_pool_t *pool, unsigned size) -{ - pj_hash_table_t *h; - unsigned table_size; - - h = pj_pool_alloc(pool, sizeof(pj_hash_table_t)); - h->count = 0; - - PJ_LOG( 5, ("hashtbl", "hash table %p created from pool %s", h, pj_pool_getobjname(pool))); - - /* size must be 2^n - 1. - round-up the size to this rule, except when size is 2^n, then size - will be round-down to 2^n-1. - */ - table_size = 8; - do { - table_size <<= 1; - } while (table_size <= size); - table_size -= 1; - - h->rows = table_size; - h->table = pj_pool_calloc(pool, table_size+1, sizeof(pj_hash_entry*)); - return h; -} - -static pj_hash_entry **find_entry( pj_pool_t *pool, pj_hash_table_t *ht, - const void *key, unsigned keylen, - void *val) -{ - pj_uint32_t hash; - pj_hash_entry **p_entry, *entry; - - hash=0; - if (keylen==PJ_HASH_KEY_STRING) { - const unsigned char *p = key; - for ( ; *p; ++p ) { - hash = hash * PJ_HASH_MULTIPLIER + *p; - } - keylen = p - (const unsigned char*)key; - } else { - const unsigned char *p = key, - *end = p + keylen; - for ( ; p!=end; ++p) { - hash = hash * PJ_HASH_MULTIPLIER + *p; - } - } - - /* scan the linked list */ - for (p_entry = &ht->table[hash & ht->rows], entry=*p_entry; - entry; - p_entry = &entry->next, entry = *p_entry) - { - if (entry->hash==hash && entry->keylen==keylen && - memcmp(entry->key, key, keylen)==0) - { - break; - } - } - - if (entry || val==NULL) - return p_entry; - - /* create a new entry */ - entry = pj_pool_alloc(pool, sizeof(pj_hash_entry)); - PJ_LOG(5, ("hashtbl", "%p: New p_entry %p created, pool used=%u, cap=%u", ht, entry, - pj_pool_get_used_size(pool), pj_pool_get_capacity(pool))); - entry->next = NULL; - entry->hash = hash; - entry->key = key; - entry->keylen = keylen; - entry->value = val; - *p_entry = entry; - - ++ht->count; - - return p_entry; -} - -PJ_DEF(void *) pj_hash_get( pj_hash_table_t *ht, - const void *key, unsigned keylen ) -{ - pj_hash_entry *entry; - entry = *find_entry( NULL, ht, key, keylen, NULL); - return entry ? entry->value : NULL; -} - -PJ_DEF(void) pj_hash_set( pj_pool_t *pool, pj_hash_table_t *ht, - const void *key, unsigned keylen, - void *value ) -{ - pj_hash_entry **p_entry; - - p_entry = find_entry( pool, ht, key, keylen, value ); - if (*p_entry) { - if (value == NULL) { - /* delete entry */ - PJ_LOG(5, ("hashtbl", "%p: p_entry %p deleted", ht, *p_entry)); - *p_entry = (*p_entry)->next; - --ht->count; - - } else { - /* overwrite */ - (*p_entry)->value = value; - PJ_LOG(5, ("hashtbl", "%p: p_entry %p value set to %p", ht, *p_entry, value)); - } - } -} - -PJ_DEF(unsigned) pj_hash_count( pj_hash_table_t *ht ) -{ - return ht->count; -} - -PJ_DEF(pj_hash_iterator_t*) pj_hash_first( pj_hash_table_t *ht, - pj_hash_iterator_t *it ) -{ - it->index = 0; - it->entry = NULL; - - for (; it->index < ht->rows; ++it->index) { - it->entry = ht->table[it->index]; - if (it->entry) { - break; - } - } - - return it->entry ? it : NULL; -} - -PJ_DEF(pj_hash_iterator_t*) pj_hash_next( pj_hash_table_t *ht, - pj_hash_iterator_t *it ) -{ - it->entry = it->entry->next; - if (it->entry) { - return it; - } - - for (++it->index; it->index < ht->rows; ++it->index) { - it->entry = ht->table[it->index]; - if (it->entry) { - break; - } - } - - return it->entry ? it : NULL; -} - -PJ_DEF(void*) pj_hash_this( pj_hash_table_t *ht, pj_hash_iterator_t *it ) -{ - PJ_CHECK_STACK(); - PJ_UNUSED_ARG(ht); - return it->entry->value; -} - -#if 0 -void pj_hash_dump_collision( pj_hash_table_t *ht ) -{ - unsigned min=0xFFFFFFFF, max=0; - unsigned i; - char line[120]; - int len, totlen = 0; - - for (i=0; i<ht->rows; ++i) { - unsigned count = 0; - pj_hash_entry *entry = ht->table[i]; - while (entry) { - ++count; - entry = entry->next; - } - if (count < min) - min = count; - if (count > max) - max = count; - len = pj_snprintf( line+totlen, sizeof(line)-totlen, "%3d:%3d ", i, count); - if (len < 1) - break; - totlen += len; - - if ((i+1) % 10 == 0) { - line[totlen] = '\0'; - PJ_LOG(4,(__FILE__, line)); - } - } - - PJ_LOG(4,(__FILE__,"Count: %d, min: %d, max: %d\n", ht->count, min, max)); -} -#endif - - +
+
+PJ_DEF(pj_hash_table_t*) pj_hash_create(pj_pool_t *pool, unsigned size)
+{
+ pj_hash_table_t *h;
+ unsigned table_size;
+
+ h = pj_pool_alloc(pool, sizeof(pj_hash_table_t));
+ h->count = 0;
+
+ PJ_LOG( 5, ("hashtbl", "hash table %p created from pool %s", h, pj_pool_getobjname(pool)));
+
+ /* size must be 2^n - 1.
+ round-up the size to this rule, except when size is 2^n, then size
+ will be round-down to 2^n-1.
+ */
+ table_size = 8;
+ do {
+ table_size <<= 1;
+ } while (table_size <= size);
+ table_size -= 1;
+
+ h->rows = table_size;
+ h->table = pj_pool_calloc(pool, table_size+1, sizeof(pj_hash_entry*));
+ return h;
+}
+
+static pj_hash_entry **find_entry( pj_pool_t *pool, pj_hash_table_t *ht,
+ const void *key, unsigned keylen,
+ void *val)
+{
+ pj_uint32_t hash;
+ pj_hash_entry **p_entry, *entry;
+
+ hash=0;
+ if (keylen==PJ_HASH_KEY_STRING) {
+ const unsigned char *p = key;
+ for ( ; *p; ++p ) {
+ hash = hash * PJ_HASH_MULTIPLIER + *p;
+ }
+ keylen = p - (const unsigned char*)key;
+ } else {
+ const unsigned char *p = key,
+ *end = p + keylen;
+ for ( ; p!=end; ++p) {
+ hash = hash * PJ_HASH_MULTIPLIER + *p;
+ }
+ }
+
+ /* scan the linked list */
+ for (p_entry = &ht->table[hash & ht->rows], entry=*p_entry;
+ entry;
+ p_entry = &entry->next, entry = *p_entry)
+ {
+ if (entry->hash==hash && entry->keylen==keylen &&
+ memcmp(entry->key, key, keylen)==0)
+ {
+ break;
+ }
+ }
+
+ if (entry || val==NULL)
+ return p_entry;
+
+ /* create a new entry */
+ entry = pj_pool_alloc(pool, sizeof(pj_hash_entry));
+ PJ_LOG(5, ("hashtbl", "%p: New p_entry %p created, pool used=%u, cap=%u", ht, entry,
+ pj_pool_get_used_size(pool), pj_pool_get_capacity(pool)));
+ entry->next = NULL;
+ entry->hash = hash;
+ entry->key = key;
+ entry->keylen = keylen;
+ entry->value = val;
+ *p_entry = entry;
+
+ ++ht->count;
+
+ return p_entry;
+}
+
+PJ_DEF(void *) pj_hash_get( pj_hash_table_t *ht,
+ const void *key, unsigned keylen )
+{
+ pj_hash_entry *entry;
+ entry = *find_entry( NULL, ht, key, keylen, NULL);
+ return entry ? entry->value : NULL;
+}
+
+PJ_DEF(void) pj_hash_set( pj_pool_t *pool, pj_hash_table_t *ht,
+ const void *key, unsigned keylen,
+ void *value )
+{
+ pj_hash_entry **p_entry;
+
+ p_entry = find_entry( pool, ht, key, keylen, value );
+ if (*p_entry) {
+ if (value == NULL) {
+ /* delete entry */
+ PJ_LOG(5, ("hashtbl", "%p: p_entry %p deleted", ht, *p_entry));
+ *p_entry = (*p_entry)->next;
+ --ht->count;
+
+ } else {
+ /* overwrite */
+ (*p_entry)->value = value;
+ PJ_LOG(5, ("hashtbl", "%p: p_entry %p value set to %p", ht, *p_entry, value));
+ }
+ }
+}
+
+PJ_DEF(unsigned) pj_hash_count( pj_hash_table_t *ht )
+{
+ return ht->count;
+}
+
+PJ_DEF(pj_hash_iterator_t*) pj_hash_first( pj_hash_table_t *ht,
+ pj_hash_iterator_t *it )
+{
+ it->index = 0;
+ it->entry = NULL;
+
+ for (; it->index < ht->rows; ++it->index) {
+ it->entry = ht->table[it->index];
+ if (it->entry) {
+ break;
+ }
+ }
+
+ return it->entry ? it : NULL;
+}
+
+PJ_DEF(pj_hash_iterator_t*) pj_hash_next( pj_hash_table_t *ht,
+ pj_hash_iterator_t *it )
+{
+ it->entry = it->entry->next;
+ if (it->entry) {
+ return it;
+ }
+
+ for (++it->index; it->index < ht->rows; ++it->index) {
+ it->entry = ht->table[it->index];
+ if (it->entry) {
+ break;
+ }
+ }
+
+ return it->entry ? it : NULL;
+}
+
+PJ_DEF(void*) pj_hash_this( pj_hash_table_t *ht, pj_hash_iterator_t *it )
+{
+ PJ_CHECK_STACK();
+ PJ_UNUSED_ARG(ht);
+ return it->entry->value;
+}
+
+#if 0
+void pj_hash_dump_collision( pj_hash_table_t *ht )
+{
+ unsigned min=0xFFFFFFFF, max=0;
+ unsigned i;
+ char line[120];
+ int len, totlen = 0;
+
+ for (i=0; i<ht->rows; ++i) {
+ unsigned count = 0;
+ pj_hash_entry *entry = ht->table[i];
+ while (entry) {
+ ++count;
+ entry = entry->next;
+ }
+ if (count < min)
+ min = count;
+ if (count > max)
+ max = count;
+ len = pj_snprintf( line+totlen, sizeof(line)-totlen, "%3d:%3d ", i, count);
+ if (len < 1)
+ break;
+ totlen += len;
+
+ if ((i+1) % 10 == 0) {
+ line[totlen] = '\0';
+ PJ_LOG(4,(__FILE__, line));
+ }
+ }
+
+ PJ_LOG(4,(__FILE__,"Count: %d, min: %d, max: %d\n", ht->count, min, max));
+}
+#endif
+
+
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