--- /dev/null
+/* 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>
+
+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=OPENSSL_malloc(sizeof(_LHASH))) == NULL)
+ goto err0;
+ if ((ret->b=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, 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=(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(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; )
+ {
+#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,
+ (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;
+ 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)
+ {
+#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.
+ */
+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;
+ }
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