diff options
Diffstat (limited to 'openssl/crypto/lhash/lhash.c')
| -rw-r--r-- | openssl/crypto/lhash/lhash.c | 475 |
1 files changed, 475 insertions, 0 deletions
diff --git a/openssl/crypto/lhash/lhash.c b/openssl/crypto/lhash/lhash.c new file mode 100644 index 00000000..47f74808 --- /dev/null +++ b/openssl/crypto/lhash/lhash.c @@ -0,0 +1,475 @@ +/* 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; + } |