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htshash.c
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2004-05-09
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/* ------------------------------------------------------------ */
/*
HTTrack Website Copier, Offline Browser for Windows and Unix
Copyright (C) Xavier Roche and other contributors
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Important notes:
- We hereby ask people using this source NOT to use it in purpose of grabbing
emails addresses, or collecting any other private information on persons.
This would disgrace our work, and spoil the many hours we spent on it.
Please visit our Website: http://www.httrack.com
*/
/* ------------------------------------------------------------ */
/* File: httrack.c subroutines: */
/* hash table system (fast index) */
/* Author: Xavier Roche */
/* ------------------------------------------------------------ */
/* Internal engine bytecode */
#define HTS_INTERNAL_BYTECODE
#include "htshash.h"
/* specific definitions */
#include "htsbase.h"
#include "htsglobal.h"
#include "htsmd5.h"
/* END specific definitions */
/* Specific macros */
#ifndef malloct
#define malloct malloc
#define freet free
#define calloct calloc
#define strcpybuff strcpy
#endif
// GESTION DES TABLES DE HACHAGE
// MΘthode α 2 clΘs (adr+fil), 2e cle facultative
// hash[no_enregistrement][pos]->hash est un index dans le tableau gΘnΘral liens
// #define HTS_HASH_SIZE 8191 (premier si possible!)
// type: numero enregistrement - 0 est case insensitive (sav) 1 (adr+fil) 2 (former_adr+former_fil)
#if HTS_HASH
// recherche dans la table selon nom1,nom2 et le no d'enregistrement
// retour: position ou -1 si non trouvΘ
int hash_read(hash_struct* hash,char* nom1,char* nom2,int type,int normalized) {
char BIGSTK normfil_[HTS_URLMAXSIZE*2];
char* normfil;
char* normadr;
unsigned int cle;
int pos;
// calculer la clΘ de recherche, non modulΘe
if (type)
cle = hash_cle(nom1,nom2);
else
cle = hash_cle(convtolower(nom1),nom2); // case insensitive
// la position se calcule en modulant
pos = (int) (cle%HTS_HASH_SIZE);
// entrΘe trouvΘe?
if (hash->hash[type][pos] >= 0) { // un ou plusieurs enregistrement(s) avec une telle clΘ existe..
// tester table de raccourcis (hash)
// pos est maintenant la position recherchΘe dans liens
pos = hash->hash[type][pos];
while (pos>=0) { // parcourir la chaine
switch (type) {
case 0: // sav
if (strfield2(nom1,hash->liens[pos]->sav)) { // case insensitive
#if DEBUG_HASH==2
printf("hash: found shortcut at %d\n",pos);
#endif
return pos;
}
break;
case 1: // adr+fil
{
if (!normalized)
normfil=hash->liens[pos]->fil;
else
normfil=fil_normalized(hash->liens[pos]->fil,normfil_);
if (!normalized)
normadr = jump_identification(hash->liens[pos]->adr);
else
normadr = jump_normalized(hash->liens[pos]->adr);
if ((strfield2(nom1,normadr)!=0) && (strcmp(nom2,normfil)==0)) {
#if DEBUG_HASH==2
printf("hash: found shortcut at %d\n",pos);
#endif
return pos;
}
}
break;
case 2: // former_adr+former_fil
{
if (hash->liens[pos]->former_adr) {
if (!normalized)
normfil=hash->liens[pos]->former_fil;
else
normfil=fil_normalized(hash->liens[pos]->former_fil,normfil_);
if (!normalized)
normadr = jump_identification(hash->liens[pos]->former_adr);
else
normadr = jump_normalized(hash->liens[pos]->former_adr);
if ((strfield2(nom1,normadr)!=0) && (strcmp(nom2,normfil)==0)) {
#if DEBUG_HASH==2
printf("hash: found shortcut at %d\n",pos);
#endif
return pos;
}
}
}
break;
}
// calculer prochaine position dans la chaine
{
int old=pos;
pos=hash->liens[pos]->hash_next[type]; // sinon prochain dans la chaine
if (old==pos)
pos=-1; // erreur de bouclage (ne devrait pas arriver)
}
}
// Ok va falloir chercher alors..
/*pos=hash->max_lien; // commencer α max_lien
switch (type) {
case 0: // sav
while(pos>=0) {
if (hash->liens[pos]->hash_sav == cle ) {
if (strcmp(nom1,hash->liens[pos]->sav)==0) {
hash->hash[type][(int) (cle%HTS_HASH_SIZE)] = pos; // noter plus rΘcent dans shortcut table
#if DEBUG_HASH==2
printf("hash: found long search at %d\n",pos);
#endif
return pos;
}
}
pos--;
}
break;
case 1: // adr+fil
while(pos>=0) {
if (hash->liens[pos]->hash_adrfil == cle ) {
if ((strcmp(nom1,hash->liens[pos]->adr)==0) && (strcmp(nom2,hash->liens[pos]->fil)==0)) {
hash->hash[type][(int) (cle%HTS_HASH_SIZE)] = pos; // noter plus rΘcent dans shortcut table
#if DEBUG_HASH==2
printf("hash: found long search at %d\n",pos);
#endif
return pos;
}
}
pos--;
}
break;
case 2: // former_adr+former_fil
while(pos>=0) {
if (hash->liens[pos]->hash_fadrfil == cle ) {
if (hash->liens[pos]->former_adr)
if ((strcmp(nom1,hash->liens[pos]->former_adr)==0) && (strcmp(nom2,hash->liens[pos]->former_fil)==0)) {
hash->hash[type][(int) (cle%HTS_HASH_SIZE)] = pos; // noter plus rΘcent dans shortcut table
#if DEBUG_HASH==2
printf("hash: found long search at %d\n",pos);
#endif
return pos;
}
}
pos--;
}
}*/
#if DEBUG_HASH==1
printf("hash: not found after test %s%s\n",nom1,nom2);
#endif
return -1; // non trouvΘ
} else {
#if DEBUG_HASH==2
printf("hash: not found %s%s\n",nom1,nom2);
#endif
return -1; // non trouvΘ : clΘ non entrΘe (mΩme une fois)
}
}
// enregistrement lien lpos dans les 3 tables hash1..3
void hash_write(hash_struct* hash,int lpos,int normalized) {
char BIGSTK normfil_[HTS_URLMAXSIZE*2];
char* normfil;
unsigned int cle;
int pos;
int* ptr;
//
if (hash->liens[lpos]) { // on sait jamais..
hash->max_lien = max(hash->max_lien,lpos);
#if DEBUG_HASH
hashnumber=hash->max_lien;
#endif
// ΘlΘment actuel sur -1 (fin de chaine)
hash->liens[lpos]->hash_next[0]=hash->liens[lpos]->hash_next[1]=hash->liens[lpos]->hash_next[2]=-1;
//
cle = hash_cle(convtolower(hash->liens[lpos]->sav),""); // CASE INSENSITIVE
pos = (int) (cle%HTS_HASH_SIZE);
ptr = hash_calc_chaine(hash,0,pos); // calculer adresse chaine
*ptr = lpos; // noter dernier enregistrΘ
#if DEBUG_HASH==3
printf("[%d",pos);
#endif
//
if (!normalized)
normfil=hash->liens[lpos]->fil;
else
normfil=fil_normalized(hash->liens[lpos]->fil,normfil_);
if (!normalized)
cle = hash_cle(jump_identification(hash->liens[lpos]->adr),normfil);
else
cle = hash_cle(jump_normalized(hash->liens[lpos]->adr),normfil);
pos = (int) (cle%HTS_HASH_SIZE);
ptr = hash_calc_chaine(hash,1,pos); // calculer adresse chaine
*ptr = lpos; // noter dernier enregistrΘ
#if DEBUG_HASH==3
printf(",%d",pos);
#endif
//
if (hash->liens[lpos]->former_adr) { // former_adr existe?
if (!normalized)
normfil=hash->liens[lpos]->former_fil;
else
normfil=fil_normalized(hash->liens[lpos]->former_fil,normfil_);
if (!normalized)
cle = hash_cle(jump_identification(hash->liens[lpos]->former_adr),normfil);
else
cle = hash_cle(jump_normalized(hash->liens[lpos]->former_adr),normfil);
pos = (int) (cle%HTS_HASH_SIZE);
ptr = hash_calc_chaine(hash,2,pos); // calculer adresse chaine
*ptr = lpos; // noter dernier enregistrΘ
#if DEBUG_HASH==3
printf(",%d",pos);
#endif
}
#if DEBUG_HASH==3
printf("] "); fflush(stdout);
#endif
}
#if DEBUT_HASH
else {
printf("* hash_write=0!!\n");
abortLogFmt("unexpected error in hash_write (pos=%d)" _ pos);
exit(1);
}
#endif
//
}
// calcul clΘ
// il n'y a pas de formule de hashage universelle, celle-ci semble acceptable..
unsigned long int hash_cle(char* nom1,char* nom2) {
/*
unsigned int sum=0;
int i=0;
while(*nom1) {
sum += 1;
sum += (unsigned int) *(nom1);
sum *= (unsigned int) *(nom1++);
sum += (unsigned int) i;
i++;
}
while(*nom2) {
sum += 1;
sum += (unsigned int) *(nom2);
sum *= (unsigned int) *(nom2++);
sum += (unsigned int) i;
i++;
}
*/
return md5sum32(nom1)
+md5sum32(nom2);
}
// calcul de la position finale dans la chaine des elements ayant la mΩme clΘ
int* hash_calc_chaine(hash_struct* hash,int type,int pos) {
#if DEBUG_HASH
int count=0;
#endif
if (hash->hash[type][pos] == -1)
return &(hash->hash[type][pos]); // premier ΘlΘment dans la chaine
pos=hash->hash[type][pos];
while(hash->liens[pos]->hash_next[type] != -1) {
pos = hash->liens[pos]->hash_next[type];
#if DEBUG_HASH
count++;
#endif
}
#if DEBUG_HASH
count++;
longest_hash[type]=max(longest_hash[type],count);
#endif
return &(hash->liens[pos]->hash_next[type]);
}
#endif
// FIN GESTION DES TABLES DE HACHAGE