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deb-mbse/lib/dbdupe.c

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/*****************************************************************************
*
* File ..................: dbdupe.c
* Purpose ...............: Dupe checking.
* Last modification date : 25-May-2001
*
*****************************************************************************
* Copyright (C) 1997-2002
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*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS 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, or (at your option) any
* later version.
*
* MBSE BBS 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 MBSE BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*****************************************************************************/
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#include "../config.h"
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#include "libs.h"
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#include "memwatch.h"
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#include "structs.h"
#include "clcomm.h"
#include "dbdupe.h"
typedef struct _dupesrec {
unsigned long *crcs;
int loaded;
int changed;
int count;
int max;
int peak;
} dupesrec;
dupesrec dupes[3];
static char *files[] = {(char *)"echomail", (char *)"fileecho", (char *)"news"};
void CloseDdb(int);
void InitDupes()
{
int i;
Syslog('n', "Init Dupes");
for (i = 0; i < 3; i++) {
dupes[i].crcs= NULL;
dupes[i].loaded = FALSE;
dupes[i].changed = FALSE;
dupes[i].count = 0;
dupes[i].max = 0;
}
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}
int CheckDupe(unsigned long crc, int idx, int max)
{
char *dfile;
FILE *fil;
unsigned long test;
int i, size = 0;
if (!dupes[idx].loaded) {
dfile = calloc(PATH_MAX, sizeof(char));
sprintf(dfile, "%s/etc/%s.dupe", getenv("MBSE_ROOT"), files[idx]);
if ((fil = fopen(dfile, "r+")) == NULL) {
/*
* Dupe database doesn't exist yet.
*/
if ((fil = fopen(dfile, "w")) == NULL) {
WriteError("$PANIC: dbdupe.c, can't create %s", dfile);
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free(dfile);
exit(1);
}
fclose(fil);
fil = fopen(dfile, "r+");
} else {
fseek(fil, 0L, SEEK_END);
size = ftell(fil) / sizeof(unsigned long);
fseek(fil, 0L, SEEK_SET);
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}
/*
* Reserve some extra memory and record howmuch.
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*/
if (size > max)
dupes[idx].peak = size + 5000;
else
dupes[idx].peak = max + 5000;
dupes[idx].crcs = (unsigned long *)malloc(dupes[idx].peak * sizeof(unsigned long));
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/*
* Load dupe records
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*/
while (fread(&test, sizeof(test), 1, fil) == 1) {
dupes[idx].crcs[dupes[idx].count] = test;
dupes[idx].count++;
}
Syslog('n', "Loaded %d dupe records in %s", dupes[idx].count++, files[idx]);
fclose(fil);
free(dfile);
dupes[idx].loaded = TRUE;
dupes[idx].max = max;
}
Syslog('n', "dupetest %08x %s %d", crc, files[idx], max);
for (i = 0; i < dupes[idx].count; i++) {
if (dupes[idx].crcs[i] == crc) {
Syslog('n', "dupe at %d", i);
return TRUE;
}
}
/*
* Not a dupe, append new crc value
*/
dupes[idx].crcs[dupes[idx].count] = crc;
Syslog('n', "Added new dupe at %d", dupes[idx].count);
dupes[idx].count++;
dupes[idx].changed = TRUE;
/*
* If we reach the high limit, flush the current dupelist.
*/
if (dupes[idx].count >= dupes[idx].peak)
CloseDdb(idx);
return FALSE;
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}
void CloseDdb(int idx)
{
int j, start;
char *dfile;
FILE *fil;
dfile = calloc(PATH_MAX, sizeof(char));
Syslog('n', "Checking %s.dupe", files[idx]);
if (dupes[idx].loaded) {
if (dupes[idx].changed) {
if (dupes[idx].count > dupes[idx].max)
start = dupes[idx].count - dupes[idx].max;
else
start = 0;
sprintf(dfile, "%s/etc/%s.dupe", getenv("MBSE_ROOT"), files[idx]);
if ((fil = fopen(dfile, "w"))) {
Syslog('n', "Writing dupes %d to %d", start, dupes[idx].count);
for (j = start; j < dupes[idx].count; j++)
fwrite(&dupes[idx].crcs[j], sizeof(unsigned long), 1, fil);
fclose(fil);
} else {
WriteError("$Can't write %s", dfile);
}
} else {
Syslog('n', "Not changed so not saved");
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}
dupes[idx].changed = FALSE;
dupes[idx].loaded = FALSE;
dupes[idx].count = 0;
dupes[idx].max = 0;
dupes[idx].peak = 0;
free(dupes[idx].crcs);
dupes[idx].crcs = NULL;
} else {
Syslog('n', "Not loaded");
}
free(dfile);
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}
void CloseDupes()
{
int i;
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Syslog('n', "Closing dupes databases");
for (i = 0; i < 3; i++)
CloseDdb(i);
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}