-/* crypto/lhash/lhash.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2017 The OpenSSL Project Authors. 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.]
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
-/* 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>
+#include <openssl/err.h>
+#include "lhash_lcl.h"
-const char *lh_version="lhash" OPENSSL_VERSION_PTEXT;
-
-#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;
- int i;
-
- if ((ret=(LHASH *)OPENSSL_malloc(sizeof(LHASH))) == NULL)
- goto err0;
- if ((ret->b=(LHASH_NODE **)OPENSSL_malloc(sizeof(LHASH_NODE *)*MIN_NODES)) == NULL)
- goto err1;
- for (i=0; i<MIN_NODES; i++)
- ret->b[i]=NULL;
- 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->p=0;
- ret->pmax=MIN_NODES/2;
- ret->up_load=UP_LOAD;
- ret->down_load=DOWN_LOAD;
- ret->num_items=0;
-
- ret->num_expands=0;
- ret->num_expand_reallocs=0;
- ret->num_contracts=0;
- ret->num_contract_reallocs=0;
- ret->num_hash_calls=0;
- ret->num_comp_calls=0;
- ret->num_insert=0;
- ret->num_replace=0;
- ret->num_delete=0;
- ret->num_no_delete=0;
- ret->num_retrieve=0;
- ret->num_retrieve_miss=0;
- ret->num_hash_comps=0;
-
- ret->error=0;
- 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, const void *data)
- {
- unsigned long hash;
- LHASH_NODE *nn,**rn;
- const 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=(LHASH_NODE *)OPENSSL_malloc(sizeof(LHASH_NODE))) == NULL)
- {
- lh->error++;
- return(NULL);
- }
- nn->data=data;
- nn->next=NULL;
-#ifndef OPENSSL_NO_HASH_COMP
- nn->hash=hash;
-#endif
- *rn=nn;
- ret=NULL;
- lh->num_insert++;
- lh->num_items++;
- }
- else /* replace same key */
- {
- ret= (*rn)->data;
- (*rn)->data=data;
- lh->num_replace++;
- }
- return((void *)ret);
- }
-
-void *lh_delete(LHASH *lh, const void *data)
- {
- unsigned long hash;
- LHASH_NODE *nn,**rn;
- const 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((void *)ret);
- }
-
-void *lh_retrieve(LHASH *lh, const void *data)
- {
- unsigned long hash;
- LHASH_NODE **rn;
- const 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((void *)ret);
- }
-
-static void doall_util_fn(LHASH *lh, int use_arg, LHASH_DOALL_FN_TYPE func,
- LHASH_DOALL_ARG_FN_TYPE func_arg, const void *arg)
- {
- int i;
- LHASH_NODE *a,*n;
-
- /* 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 */
- 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)NULL, NULL);
- }
-
-void lh_doall_arg(LHASH *lh, LHASH_DOALL_ARG_FN_TYPE func, const void *arg)
- {
- doall_util_fn(lh, 1, (LHASH_DOALL_FN_TYPE)NULL, 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; )
- {
-#ifndef OPENSSL_NO_HASH_COMP
- hash=np->hash;
-#else
- hash=lh->hash(np->data);
- lh->num_hash_calls++;
-#endif
- 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=(LHASH_NODE **)OPENSSL_realloc(lh->b,
- (unsigned int)sizeof(LHASH_NODE *)*j);
- if (n == NULL)
- {
-/* fputs("realloc error in lhash",stderr); */
- lh->error++;
- lh->p=0;
- return;
- }
- /* else */
- 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=(LHASH_NODE **)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;
- int (*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)
- {
-#ifndef OPENSSL_NO_HASH_COMP
- lh->num_hash_comps++;
- if (n1->hash != hash)
- {
- ret= &(n1->next);
- continue;
- }
-#endif
- 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.
+/*
+ * A hashing implementation that appears to be based on the linear hashing
+ * alogrithm:
+ * https://en.wikipedia.org/wiki/Linear_hashing
+ *
+ * Litwin, Witold (1980), "Linear hashing: A new tool for file and table
+ * addressing", Proc. 6th Conference on Very Large Databases: 212-223
+ * http://hackthology.com/pdfs/Litwin-1980-Linear_Hashing.pdf
+ *
+ * From the wikipedia article "Linear hashing is used in the BDB Berkeley
+ * database system, which in turn is used by many software systems such as
+ * OpenLDAP, using a C implementation derived from the CACM article and first
+ * published on the Usenet in 1988 by Esmond Pitt."
+ *
+ * The CACM paper is available here:
+ * https://pdfs.semanticscholar.org/ff4d/1c5deca6269cc316bfd952172284dbf610ee.pdf
*/
-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);
+
+#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 int expand(OPENSSL_LHASH *lh);
+static void contract(OPENSSL_LHASH *lh);
+static OPENSSL_LH_NODE **getrn(OPENSSL_LHASH *lh, const void *data, unsigned long *rhash);
+
+OPENSSL_LHASH *OPENSSL_LH_new(OPENSSL_LH_HASHFUNC h, OPENSSL_LH_COMPFUNC c)
+{
+ OPENSSL_LHASH *ret;
+
+ if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) {
+ /*
+ * Do not set the error code, because the ERR code uses LHASH
+ * and we want to avoid possible endless error loop.
+ * CRYPTOerr(CRYPTO_F_OPENSSL_LH_NEW, ERR_R_MALLOC_FAILURE);
+ */
+ return NULL;
+ }
+ if ((ret->b = OPENSSL_zalloc(sizeof(*ret->b) * MIN_NODES)) == NULL)
+ goto err;
+ ret->comp = ((c == NULL) ? (OPENSSL_LH_COMPFUNC)strcmp : c);
+ ret->hash = ((h == NULL) ? (OPENSSL_LH_HASHFUNC)OPENSSL_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;
+
+err:
+ OPENSSL_free(ret->b);
+ OPENSSL_free(ret);
+ return NULL;
+}
+
+void OPENSSL_LH_free(OPENSSL_LHASH *lh)
+{
+ unsigned int i;
+ OPENSSL_LH_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 *OPENSSL_LH_insert(OPENSSL_LHASH *lh, void *data)
+{
+ unsigned long hash;
+ OPENSSL_LH_NODE *nn, **rn;
+ void *ret;
+
+ lh->error = 0;
+ if ((lh->up_load <= (lh->num_items * LH_LOAD_MULT / lh->num_nodes)) && !expand(lh))
+ return NULL; /* 'lh->error++' already done in 'expand' */
+
+ 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 *OPENSSL_LH_delete(OPENSSL_LHASH *lh, const void *data)
+{
+ unsigned long hash;
+ OPENSSL_LH_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 *OPENSSL_LH_retrieve(OPENSSL_LHASH *lh, const void *data)
+{
+ unsigned long hash;
+ OPENSSL_LH_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(OPENSSL_LHASH *lh, int use_arg,
+ OPENSSL_LH_DOALL_FUNC func,
+ OPENSSL_LH_DOALL_FUNCARG func_arg, void *arg)
+{
+ int i;
+ OPENSSL_LH_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) {
+ n = a->next;
+ if (use_arg)
+ func_arg(a->data, arg);
+ else
+ func(a->data);
+ a = n;
+ }
+ }
+}
+
+void OPENSSL_LH_doall(OPENSSL_LHASH *lh, OPENSSL_LH_DOALL_FUNC func)
+{
+ doall_util_fn(lh, 0, func, (OPENSSL_LH_DOALL_FUNCARG)0, NULL);
+}
+
+void OPENSSL_LH_doall_arg(OPENSSL_LHASH *lh, OPENSSL_LH_DOALL_FUNCARG func, void *arg)
+{
+ doall_util_fn(lh, 1, (OPENSSL_LH_DOALL_FUNC)0, func, arg);
+}
+
+static int expand(OPENSSL_LHASH *lh)
+{
+ OPENSSL_LH_NODE **n, **n1, **n2, *np;
+ unsigned int p, pmax, nni, j;
+ unsigned long hash;
+
+ nni = lh->num_alloc_nodes;
+ p = lh->p;
+ pmax = lh->pmax;
+ if (p + 1 >= pmax) {
+ j = nni * 2;
+ n = OPENSSL_realloc(lh->b, sizeof(OPENSSL_LH_NODE *) * j);
+ if (n == NULL) {
+ lh->error++;
+ return 0;
+ }
+ lh->b = n;
+ memset(n + nni, 0, sizeof(*n) * (j - nni));
+ lh->pmax = nni;
+ lh->num_alloc_nodes = j;
+ lh->num_expand_reallocs++;
+ lh->p = 0;
+ } else {
+ lh->p++;
+ }
+
+ lh->num_nodes++;
+ lh->num_expands++;
+ n1 = &(lh->b[p]);
+ n2 = &(lh->b[p + pmax]);
+ *n2 = NULL;
+
+ 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;
+ }
+
+ return 1;
+}
+
+static void contract(OPENSSL_LHASH *lh)
+{
+ OPENSSL_LH_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(OPENSSL_LH_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 OPENSSL_LH_NODE **getrn(OPENSSL_LHASH *lh,
+ const void *data, unsigned long *rhash)
+{
+ OPENSSL_LH_NODE **ret, *n1;
+ unsigned long hash, nn;
+ OPENSSL_LH_COMPFUNC 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;
+}
+
/*
- 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;
- }
+ * 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 OPENSSL_LH_strhash(const char *c)
+{
+ unsigned long ret = 0;
+ long n;
+ unsigned long v;
+ int r;
+
+ if ((c == NULL) || (*c == '\0'))
+ return ret;
+
+ 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 OPENSSL_LH_num_items(const OPENSSL_LHASH *lh)
+{
+ return lh ? lh->num_items : 0;
+}
+
+unsigned long OPENSSL_LH_get_down_load(const OPENSSL_LHASH *lh)
+{
+ return lh->down_load;
+}
+
+void OPENSSL_LH_set_down_load(OPENSSL_LHASH *lh, unsigned long down_load)
+{
+ lh->down_load = down_load;
+}
+
+int OPENSSL_LH_error(OPENSSL_LHASH *lh)
+{
+ return lh->error;
+}
projects / openssl.git / blobdiff