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htsindex.c
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2006-01-21
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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: htsindex.c */
/* keyword indexing system (search index) */
/* Author: Xavier Roche */
/* ------------------------------------------------------------ */
/* Internal engine bytecode */
#define HTS_INTERNAL_BYTECODE
#include "htsindex.h"
#include "htsglobal.h"
#include "htslib.h"
#if HTS_MAKE_KEYWORD_INDEX
#include "htshash.h"
#include "htsinthash.h"
/* Keyword Indexer Parameters */
// Maximum length for a keyword
#define KEYW_LEN 50
// Minimum length for a keyword - MUST NOT BE NULL!!!
#define KEYW_MIN_LEN 3
// What characters to accept? - MUST NOT BE EMPTY AND MUST NOT CONTAIN THE SPACE (32) CHARACTER!!!
#define KEYW_ACCEPT "abcdefghijklmnopqrstuvwxyz0123456789-_."
// Convert A to a, and so on.. to avoid case problems in indexing
// This can be a generic table, containing characters that are in fact not accepted by KEYW_ACCEPT
// MUST HAVE SAME SIZES!!
#define KEYW_TRANSCODE_FROM (\
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
"αΓΣ" \
"└┬─" \
"ΘΦΩδ" \
"╚╚╩╦" \
"∞ε∩" \
"╠╬╧" \
"≥⌠÷" \
"╥╘╓" \
"∙√ⁿ" \
"┘█▄" \
" " \
)
#define KEYW_TRANSCODE_TO ( \
"abcdefghijklmnopqrstuvwxyz" \
"aaa" \
"aaa" \
"eeee" \
"eeee" \
"iii" \
"iii" \
"ooo" \
"ooo" \
"uuu" \
"uuu" \
"y" \
)
// These (accepted) characters will be ignored at begining of a keyword
#define KEYW_IGNORE_BEG "-_."
// These (accepted) characters will be stripped if at the end of a keyword
#define KEYW_STRIP_END "-_."
// Words begining with these (accepted) characters will be ignored
#define KEYW_NOT_BEG "0123456789"
// Treat these characters as space characters - MUST NOT BE EMPTY!!!
#define KEYW_SPACE " ',;:!?\"\x0d\x0a\x09\x0b\x0c"
// Common words (the,for..) detector
// If a word represents more than KEYW_USELESS1K (%1000) of total words, then ignore it
// 5 (0.5%)
#define KEYW_USELESS1K 5
// If a word is present in more than KEYW_USELESS1KPG (%1000) pages, then ignore it
// 800 (80%)
#define KEYW_USELESS1KPG 800
// This number will be reduced by index hit for sorting purpose
// leave it as it is here if you don't REALLY know what you are doing
// Yes, I may be the only person, maybe
#define KEYW_SORT_MAXCOUNT 999999999
/* End of Keyword Indexer Parameters */
int strcpos(char* adr,char c);
int mystrcmp(const void* _e1,const void* _e2);
// Global variables
int hts_index_init=1;
int hts_primindex_size=0;
FILE* fp_tmpproject=NULL;
int hts_primindex_words=0;
#endif
/*
Init index
*/
void index_init(const char* indexpath) {
#if HTS_MAKE_KEYWORD_INDEX
#ifndef _WIN32_WCE
/* remove(concat(indexpath,"index.txt")); */
hts_index_init=1;
hts_primindex_size=0;
hts_primindex_words=0;
fp_tmpproject=tmpfile();
#endif
#endif
}
/*
Indexing system
A little bit dirty, (quick'n dirty, in fact)
But should be okay on most cases
Tags and javascript handled (ignored)
*/
int index_keyword(const char* html_data,LLint size,const char* mime,const char* filename,const char* indexpath) {
#if HTS_MAKE_KEYWORD_INDEX
int intag=0,inscript=0,incomment=0;
char keyword[KEYW_LEN+32];
int i=0;
//
int WordIndexSize=1024;
inthash WordIndexHash=NULL;
FILE *tmpfp=NULL;
//
// Check parameters
if (!html_data)
return 0;
if (!size)
return 0;
if (!mime)
return 0;
if (!filename)
return 0;
// Init ?
if (hts_index_init) {
remove(concat(indexpath,"index.txt"));
remove(concat(indexpath,"sindex.html"));
hts_index_init=0;
}
// Check MIME type
if (strfield2(mime,"text/html")) {
inscript=0;
}
// FIXME - temporary fix for image/svg+xml (svg)
// "IN XML" (html like, in fact :) )
else if (
(strfield2(mime,"image/svg+xml"))
||
(strfield2(mime,"image/svg-xml"))
#if HTS_USEMMS
||
strfield2(mime,"video/x-ms-asf")
#endif
) {
inscript=0;
}
else if (
(strfield2(mime,"application/x-javascript"))
|| (strfield2(mime,"text/css"))
) {
inscript=1;
//} else if (strfield2(mime, "text/vnd.wap.wml")) { // humm won't work in many cases
// inscript=0;
} else
return 0;
// Temporary file
tmpfp = tmpfile();
if (!tmpfp)
return 0;
// Create hash structure
// Hash tables rulez da world!
WordIndexHash=inthash_new(WordIndexSize);
if (!WordIndexHash)
return 0;
// Start indexing this page
keyword[0]='\0';
while(i<size) {
if (strfield(html_data + i , "<script")) {
inscript=1;
}
else if (strfield(html_data + i , "<!--")) {
incomment=1;
}
else if (strfield(html_data + i , "</script")) {
if (!incomment)
inscript=0;
}
else if (strfield(html_data + i , "-->")) {
incomment=0;
}
else if (html_data[i]=='<') {
if (!inscript)
intag=1;
}
else if (html_data[i]=='>') {
intag=0;
}
else {
// Okay, parse keywords
if ( (!inscript) && (!incomment) && (!intag) ) {
char cchar=html_data[i];
int pos;
int len=strlen(keyword);
// Replace (ignore case, and so on..)
if ((pos=strcpos(KEYW_TRANSCODE_FROM,cchar))>=0)
cchar=KEYW_TRANSCODE_TO[pos];
if (strchr(KEYW_ACCEPT,cchar)) {
/* Ignore some characters at begining */
if ((len>0) || (!strchr(KEYW_IGNORE_BEG,cchar))) {
keyword[len++]=cchar;
keyword[len]='\0';
}
} else if ( (strchr(KEYW_SPACE,cchar)) || (!cchar) ) {
/* Avoid these words */
if (len>0) {
if (strchr(KEYW_NOT_BEG,keyword[0])) {
keyword[(len=0)]='\0';
}
}
/* Strip ending . and so */
{
int ok=0;
while((len=strlen(keyword)) && (!ok)) {
if (strchr(KEYW_STRIP_END,keyword[len-1])) { /* strip it */
keyword[len-1]='\0';
} else
ok=1;
}
}
/* Store it ? */
if (len >= KEYW_MIN_LEN ) {
hts_primindex_words++;
if (inthash_inc(WordIndexHash,keyword)) { /* added new */
fprintf(tmpfp,"%s\n",keyword);
}
}
keyword[(len=0)]='\0';
} else /* Invalid */
keyword[(len=0)]='\0';
if (len>KEYW_LEN) {
keyword[(len=0)]='\0';
}
}
}
i++;
}
// Reset temp file
fseek(tmpfp,0,SEEK_SET);
// Process indexing for this page
{
//FILE* fp=NULL;
//fp=fopen(concat(indexpath,"index.txt"),"ab");
if (fp_tmpproject) {
while(!feof(tmpfp)) {
char line[KEYW_LEN + 32];
linput(tmpfp,line,KEYW_LEN + 2);
if (strnotempty(line)) {
unsigned long int e=0;
if (inthash_read(WordIndexHash,line,&e)) {
//if (e) {
char BIGSTK savelst[HTS_URLMAXSIZE*2];
e++; /* 0 means "once" */
if (strncmp((const char*)fslash((char*)indexpath),filename,strlen(indexpath))==0) // couper
strcpybuff(savelst,filename+strlen(indexpath));
else
strcpybuff(savelst,filename);
// Add entry for this file and word
fprintf(fp_tmpproject,"%s %d %s\n",line,(int) (KEYW_SORT_MAXCOUNT - e),savelst);
hts_primindex_size++;
//}
}
}
}
//fclose(fp);
}
}
// Delete temp file
fclose(tmpfp);
tmpfp=NULL;
// Clear hash table
inthash_delete(&WordIndexHash);
#endif
return 1;
}
/*
Sort index!
*/
void index_finish(const char* indexpath,int mode) {
#if HTS_MAKE_KEYWORD_INDEX
char** tab;
char* blk;
INTsys size;
size=fpsize(fp_tmpproject);
if (size>0) {
//FILE* fp=fopen(concat(indexpath,"index.txt"),"rb");
if (fp_tmpproject) {
tab=(char**)malloct(sizeof(char*) * (hts_primindex_size+2) );
if (tab) {
blk = malloct(size+4);
if (blk) {
fseek(fp_tmpproject,0,SEEK_SET);
if ((INTsys)fread(blk,1,size,fp_tmpproject) == size) {
char *a=blk,*b;
int index=0;
int i;
FILE* fp;
while( (b=strchr(a,'\n')) && (index < hts_primindex_size) ) {
tab[index++]=a;
*b='\0';
a=b+1;
}
// Sort it!
qsort(tab,index,sizeof(char*),mystrcmp);
// Delete fp_tmpproject
fclose(fp_tmpproject);
fp_tmpproject=NULL;
// Write new file
if (mode == 1) // TEXT
fp=fopen(concat(indexpath,"index.txt"),"wb");
else // HTML
fp=fopen(concat(indexpath,"sindex.html"),"wb");
if (fp) {
char current_word[KEYW_LEN + 32];
char word[KEYW_LEN + 32];
int hit;
int total_hit=0;
int total_line=0;
int last_pos=0;
char word0='\0';
current_word[0]='\0';
if (mode == 2) { // HTML
for(i=0;i<index;i++) {
if (word0 != tab[i][0]) {
word0 = tab[i][0];
fprintf(fp," <a href=\"#%c\">%c</a>\r\n",word0,word0);
}
}
word0='\0';
fprintf(fp,"<br><br>\r\n");
fprintf(fp,"<table width=\"100%%\" border=\"0\">\r\n<tr>\r\n<td>word</td>\r\n<td>location\r\n");
}
for(i=0;i<index;i++) {
if (sscanf(tab[i],"%s %d",word,&hit) == 2) {
char* a=strchr(tab[i],' ');
if (a) a=strchr(a+1,' ');
if (a++) { /* Yes, a++, not ++a :) */
hit=KEYW_SORT_MAXCOUNT-hit;
if (strcmp(word,current_word)) { /* New word */
if (total_hit) {
if (mode == 1) // TEXT
fprintf(fp,"\t=%d\r\n",total_hit);
//else // HTML
// fprintf(fp,"<br>(%d total hits)\r\n",total_hit);
if (
( ((total_hit*1000 ) / hts_primindex_words) >= KEYW_USELESS1K )
||
( ((total_line*1000) / index ) >= KEYW_USELESS1KPG )
) {
fseek(fp,last_pos,SEEK_SET);
if (mode == 1) // TEXT
fprintf(fp,"\tignored (%d)\r\n",((total_hit*1000)/hts_primindex_words));
else
fprintf(fp,"(ignored) [%d hits]<br>\r\n",total_hit);
}
else {
if (mode == 1) // TEXT
fprintf(fp,"\t(%d)\r\n",((total_hit*1000)/hts_primindex_words));
//else // HTML
// fprintf(fp,"(%d)\r\n",((total_hit*1000)/hts_primindex_words));
}
}
if (mode == 1) // TEXT
fprintf(fp,"%s\r\n",word);
else { // HTML
fprintf(fp,"</td></tr>\r\n");
if (word0 != word[0]) {
word0 = word[0];
fprintf(fp,"<th>%c</th>\r\n",word0);
fprintf(fp,"<a name=\"%c\"></a>\r\n",word0);
}
fprintf(fp,"<tr>\r\n<td>%s</td>\r\n<td>\r\n",word);
}
fflush(fp); last_pos=ftell(fp);
strcpybuff(current_word,word);
total_hit=total_line=0;
}
total_hit+=hit;
total_line++;
if (mode == 1) // TEXT
fprintf(fp,"\t%d %s\r\n",hit,a);
else // HTML
fprintf(fp,"<a href=\"%s\">%s</a> [%d hits]<br>\r\n",a,a,hit);
}
}
}
if (mode == 2) // HTML
fprintf(fp,"</td></tr>\r\n</table>\r\n");
fclose(fp);
}
}
freet(blk);
}
freet(tab);
}
}
//qsort
}
if (fp_tmpproject)
fclose(fp_tmpproject);
fp_tmpproject=NULL;
#endif
}
/* Subroutines */
#if HTS_MAKE_KEYWORD_INDEX
int strcpos(char* adr,char c) {
char* apos=strchr(adr,c);
if (apos)
return (int)(apos-adr);
else
return -1;
}
int mystrcmp(const void* _e1,const void* _e2) {
char** e1=(char**)_e1;
char** e2=(char**)_e2;
return strcmp(*e1,*e2);
}
#endif