e6b5c341b9
Make LHASH_OF use static inline functions. Add new lh_get_down_load and lh_set_down_load functions and their typesafe inline equivalents. Make lh_error a function instead of a macro. Reviewed-by: Rich Salz <rsalz@openssl.org>
439 lines
12 KiB
C
439 lines
12 KiB
C
/* crypto/lhash/lhash.c */
|
|
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
|
|
* All rights reserved.
|
|
*
|
|
* This package is an SSL implementation written
|
|
* by Eric Young (eay@cryptsoft.com).
|
|
* The implementation was written so as to conform with Netscapes SSL.
|
|
*
|
|
* This library is free for commercial and non-commercial use as long as
|
|
* the following conditions are aheared to. The following conditions
|
|
* apply to all code found in this distribution, be it the RC4, RSA,
|
|
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
|
|
* included with this distribution is covered by the same copyright terms
|
|
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
|
|
*
|
|
* Copyright remains Eric Young's, and as such any Copyright notices in
|
|
* the code are not to be removed.
|
|
* If this package is used in a product, Eric Young should be given attribution
|
|
* as the author of the parts of the library used.
|
|
* This can be in the form of a textual message at program startup or
|
|
* in documentation (online or textual) provided with the package.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* "This product includes cryptographic software written by
|
|
* Eric Young (eay@cryptsoft.com)"
|
|
* The word 'cryptographic' can be left out if the rouines from the library
|
|
* being used are not cryptographic related :-).
|
|
* 4. If you include any Windows specific code (or a derivative thereof) from
|
|
* the apps directory (application code) you must include an acknowledgement:
|
|
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* The licence and distribution terms for any publically available version or
|
|
* derivative of this code cannot be changed. i.e. this code cannot simply be
|
|
* copied and put under another distribution licence
|
|
* [including the GNU Public Licence.]
|
|
*/
|
|
|
|
/*-
|
|
* Code for dynamic hash table routines
|
|
* Author - Eric Young v 2.0
|
|
*
|
|
* 2.2 eay - added #include "crypto.h" so the memory leak checking code is
|
|
* present. eay 18-Jun-98
|
|
*
|
|
* 2.1 eay - Added an 'error in last operation' flag. eay 6-May-98
|
|
*
|
|
* 2.0 eay - Fixed a bug that occurred when using lh_delete
|
|
* from inside lh_doall(). As entries were deleted,
|
|
* the 'table' was 'contract()ed', making some entries
|
|
* jump from the end of the table to the start, there by
|
|
* skipping the lh_doall() processing. eay - 4/12/95
|
|
*
|
|
* 1.9 eay - Fixed a memory leak in lh_free, the LHASH_NODEs
|
|
* were not being free()ed. 21/11/95
|
|
*
|
|
* 1.8 eay - Put the stats routines into a separate file, lh_stats.c
|
|
* 19/09/95
|
|
*
|
|
* 1.7 eay - Removed the fputs() for realloc failures - the code
|
|
* should silently tolerate them. I have also fixed things
|
|
* lint complained about 04/05/95
|
|
*
|
|
* 1.6 eay - Fixed an invalid pointers in contract/expand 27/07/92
|
|
*
|
|
* 1.5 eay - Fixed a misuse of realloc in expand 02/03/1992
|
|
*
|
|
* 1.4 eay - Fixed lh_doall so the function can call lh_delete 28/05/91
|
|
*
|
|
* 1.3 eay - Fixed a few lint problems 19/3/1991
|
|
*
|
|
* 1.2 eay - Fixed lh_doall problem 13/3/1991
|
|
*
|
|
* 1.1 eay - Added lh_doall
|
|
*
|
|
* 1.0 eay - First version
|
|
*/
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <openssl/crypto.h>
|
|
#include <openssl/lhash.h>
|
|
|
|
#undef MIN_NODES
|
|
#define MIN_NODES 16
|
|
#define UP_LOAD (2*LH_LOAD_MULT) /* load times 256 (default 2) */
|
|
#define DOWN_LOAD (LH_LOAD_MULT) /* load times 256 (default 1) */
|
|
|
|
static void expand(_LHASH *lh);
|
|
static void contract(_LHASH *lh);
|
|
static LHASH_NODE **getrn(_LHASH *lh, const void *data, unsigned long *rhash);
|
|
|
|
_LHASH *lh_new(LHASH_HASH_FN_TYPE h, LHASH_COMP_FN_TYPE c)
|
|
{
|
|
_LHASH *ret;
|
|
|
|
if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
|
|
goto err0;
|
|
if ((ret->b = OPENSSL_zalloc(sizeof(*ret->b) * MIN_NODES)) == NULL)
|
|
goto err1;
|
|
ret->comp = ((c == NULL) ? (LHASH_COMP_FN_TYPE)strcmp : c);
|
|
ret->hash = ((h == NULL) ? (LHASH_HASH_FN_TYPE)lh_strhash : h);
|
|
ret->num_nodes = MIN_NODES / 2;
|
|
ret->num_alloc_nodes = MIN_NODES;
|
|
ret->pmax = MIN_NODES / 2;
|
|
ret->up_load = UP_LOAD;
|
|
ret->down_load = DOWN_LOAD;
|
|
return (ret);
|
|
|
|
err1:
|
|
OPENSSL_free(ret);
|
|
err0:
|
|
return (NULL);
|
|
}
|
|
|
|
void lh_free(_LHASH *lh)
|
|
{
|
|
unsigned int i;
|
|
LHASH_NODE *n, *nn;
|
|
|
|
if (lh == NULL)
|
|
return;
|
|
|
|
for (i = 0; i < lh->num_nodes; i++) {
|
|
n = lh->b[i];
|
|
while (n != NULL) {
|
|
nn = n->next;
|
|
OPENSSL_free(n);
|
|
n = nn;
|
|
}
|
|
}
|
|
OPENSSL_free(lh->b);
|
|
OPENSSL_free(lh);
|
|
}
|
|
|
|
void *lh_insert(_LHASH *lh, void *data)
|
|
{
|
|
unsigned long hash;
|
|
LHASH_NODE *nn, **rn;
|
|
void *ret;
|
|
|
|
lh->error = 0;
|
|
if (lh->up_load <= (lh->num_items * LH_LOAD_MULT / lh->num_nodes))
|
|
expand(lh);
|
|
|
|
rn = getrn(lh, data, &hash);
|
|
|
|
if (*rn == NULL) {
|
|
if ((nn = OPENSSL_malloc(sizeof(*nn))) == NULL) {
|
|
lh->error++;
|
|
return (NULL);
|
|
}
|
|
nn->data = data;
|
|
nn->next = NULL;
|
|
nn->hash = hash;
|
|
*rn = nn;
|
|
ret = NULL;
|
|
lh->num_insert++;
|
|
lh->num_items++;
|
|
} else { /* replace same key */
|
|
|
|
ret = (*rn)->data;
|
|
(*rn)->data = data;
|
|
lh->num_replace++;
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
void *lh_delete(_LHASH *lh, const void *data)
|
|
{
|
|
unsigned long hash;
|
|
LHASH_NODE *nn, **rn;
|
|
void *ret;
|
|
|
|
lh->error = 0;
|
|
rn = getrn(lh, data, &hash);
|
|
|
|
if (*rn == NULL) {
|
|
lh->num_no_delete++;
|
|
return (NULL);
|
|
} else {
|
|
nn = *rn;
|
|
*rn = nn->next;
|
|
ret = nn->data;
|
|
OPENSSL_free(nn);
|
|
lh->num_delete++;
|
|
}
|
|
|
|
lh->num_items--;
|
|
if ((lh->num_nodes > MIN_NODES) &&
|
|
(lh->down_load >= (lh->num_items * LH_LOAD_MULT / lh->num_nodes)))
|
|
contract(lh);
|
|
|
|
return (ret);
|
|
}
|
|
|
|
void *lh_retrieve(_LHASH *lh, const void *data)
|
|
{
|
|
unsigned long hash;
|
|
LHASH_NODE **rn;
|
|
void *ret;
|
|
|
|
lh->error = 0;
|
|
rn = getrn(lh, data, &hash);
|
|
|
|
if (*rn == NULL) {
|
|
lh->num_retrieve_miss++;
|
|
return (NULL);
|
|
} else {
|
|
ret = (*rn)->data;
|
|
lh->num_retrieve++;
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
static void doall_util_fn(_LHASH *lh, int use_arg, LHASH_DOALL_FN_TYPE func,
|
|
LHASH_DOALL_ARG_FN_TYPE func_arg, void *arg)
|
|
{
|
|
int i;
|
|
LHASH_NODE *a, *n;
|
|
|
|
if (lh == NULL)
|
|
return;
|
|
|
|
/*
|
|
* reverse the order so we search from 'top to bottom' We were having
|
|
* memory leaks otherwise
|
|
*/
|
|
for (i = lh->num_nodes - 1; i >= 0; i--) {
|
|
a = lh->b[i];
|
|
while (a != NULL) {
|
|
/*
|
|
* 28/05/91 - eay - n added so items can be deleted via lh_doall
|
|
*/
|
|
/*
|
|
* 22/05/08 - ben - eh? since a is not passed, this should not be
|
|
* needed
|
|
*/
|
|
n = a->next;
|
|
if (use_arg)
|
|
func_arg(a->data, arg);
|
|
else
|
|
func(a->data);
|
|
a = n;
|
|
}
|
|
}
|
|
}
|
|
|
|
void lh_doall(_LHASH *lh, LHASH_DOALL_FN_TYPE func)
|
|
{
|
|
doall_util_fn(lh, 0, func, (LHASH_DOALL_ARG_FN_TYPE)0, NULL);
|
|
}
|
|
|
|
void lh_doall_arg(_LHASH *lh, LHASH_DOALL_ARG_FN_TYPE func, void *arg)
|
|
{
|
|
doall_util_fn(lh, 1, (LHASH_DOALL_FN_TYPE)0, func, arg);
|
|
}
|
|
|
|
static void expand(_LHASH *lh)
|
|
{
|
|
LHASH_NODE **n, **n1, **n2, *np;
|
|
unsigned int p, i, j;
|
|
unsigned long hash, nni;
|
|
|
|
lh->num_nodes++;
|
|
lh->num_expands++;
|
|
p = (int)lh->p++;
|
|
n1 = &(lh->b[p]);
|
|
n2 = &(lh->b[p + (int)lh->pmax]);
|
|
*n2 = NULL; /* 27/07/92 - eay - undefined pointer bug */
|
|
nni = lh->num_alloc_nodes;
|
|
|
|
for (np = *n1; np != NULL;) {
|
|
hash = np->hash;
|
|
if ((hash % nni) != p) { /* move it */
|
|
*n1 = (*n1)->next;
|
|
np->next = *n2;
|
|
*n2 = np;
|
|
} else
|
|
n1 = &((*n1)->next);
|
|
np = *n1;
|
|
}
|
|
|
|
if ((lh->p) >= lh->pmax) {
|
|
j = (int)lh->num_alloc_nodes * 2;
|
|
n = OPENSSL_realloc(lh->b, (int)(sizeof(LHASH_NODE *) * j));
|
|
if (n == NULL) {
|
|
/* fputs("realloc error in lhash",stderr); */
|
|
lh->error++;
|
|
lh->p = 0;
|
|
return;
|
|
}
|
|
for (i = (int)lh->num_alloc_nodes; i < j; i++) /* 26/02/92 eay */
|
|
n[i] = NULL; /* 02/03/92 eay */
|
|
lh->pmax = lh->num_alloc_nodes;
|
|
lh->num_alloc_nodes = j;
|
|
lh->num_expand_reallocs++;
|
|
lh->p = 0;
|
|
lh->b = n;
|
|
}
|
|
}
|
|
|
|
static void contract(_LHASH *lh)
|
|
{
|
|
LHASH_NODE **n, *n1, *np;
|
|
|
|
np = lh->b[lh->p + lh->pmax - 1];
|
|
lh->b[lh->p + lh->pmax - 1] = NULL; /* 24/07-92 - eay - weird but :-( */
|
|
if (lh->p == 0) {
|
|
n = OPENSSL_realloc(lh->b,
|
|
(unsigned int)(sizeof(LHASH_NODE *) * lh->pmax));
|
|
if (n == NULL) {
|
|
/* fputs("realloc error in lhash",stderr); */
|
|
lh->error++;
|
|
return;
|
|
}
|
|
lh->num_contract_reallocs++;
|
|
lh->num_alloc_nodes /= 2;
|
|
lh->pmax /= 2;
|
|
lh->p = lh->pmax - 1;
|
|
lh->b = n;
|
|
} else
|
|
lh->p--;
|
|
|
|
lh->num_nodes--;
|
|
lh->num_contracts++;
|
|
|
|
n1 = lh->b[(int)lh->p];
|
|
if (n1 == NULL)
|
|
lh->b[(int)lh->p] = np;
|
|
else {
|
|
while (n1->next != NULL)
|
|
n1 = n1->next;
|
|
n1->next = np;
|
|
}
|
|
}
|
|
|
|
static LHASH_NODE **getrn(_LHASH *lh, const void *data, unsigned long *rhash)
|
|
{
|
|
LHASH_NODE **ret, *n1;
|
|
unsigned long hash, nn;
|
|
LHASH_COMP_FN_TYPE cf;
|
|
|
|
hash = (*(lh->hash)) (data);
|
|
lh->num_hash_calls++;
|
|
*rhash = hash;
|
|
|
|
nn = hash % lh->pmax;
|
|
if (nn < lh->p)
|
|
nn = hash % lh->num_alloc_nodes;
|
|
|
|
cf = lh->comp;
|
|
ret = &(lh->b[(int)nn]);
|
|
for (n1 = *ret; n1 != NULL; n1 = n1->next) {
|
|
lh->num_hash_comps++;
|
|
if (n1->hash != hash) {
|
|
ret = &(n1->next);
|
|
continue;
|
|
}
|
|
lh->num_comp_calls++;
|
|
if (cf(n1->data, data) == 0)
|
|
break;
|
|
ret = &(n1->next);
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* The following hash seems to work very well on normal text strings no
|
|
* collisions on /usr/dict/words and it distributes on %2^n quite well, not
|
|
* as good as MD5, but still good.
|
|
*/
|
|
unsigned long lh_strhash(const char *c)
|
|
{
|
|
unsigned long ret = 0;
|
|
long n;
|
|
unsigned long v;
|
|
int r;
|
|
|
|
if ((c == NULL) || (*c == '\0'))
|
|
return (ret);
|
|
/*-
|
|
unsigned char b[16];
|
|
MD5(c,strlen(c),b);
|
|
return(b[0]|(b[1]<<8)|(b[2]<<16)|(b[3]<<24));
|
|
*/
|
|
|
|
n = 0x100;
|
|
while (*c) {
|
|
v = n | (*c);
|
|
n += 0x100;
|
|
r = (int)((v >> 2) ^ v) & 0x0f;
|
|
ret = (ret << r) | (ret >> (32 - r));
|
|
ret &= 0xFFFFFFFFL;
|
|
ret ^= v * v;
|
|
c++;
|
|
}
|
|
return ((ret >> 16) ^ ret);
|
|
}
|
|
|
|
unsigned long lh_num_items(const _LHASH *lh)
|
|
{
|
|
return lh ? lh->num_items : 0;
|
|
}
|
|
|
|
unsigned long lh_get_down_load(const _LHASH *lh)
|
|
{
|
|
return lh->down_load;
|
|
}
|
|
|
|
void lh_set_down_load(_LHASH *lh, unsigned long down_load)
|
|
{
|
|
lh->down_load = down_load;
|
|
}
|
|
|
|
int lh_error(_LHASH *lh)
|
|
{
|
|
return lh->error;
|
|
}
|