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cdb_make.c
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cdb_make.c
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/*
integrit - file integrity verification system
Copyright (C) 2006 Ed L. Cashin
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 (at your option) 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.
*/
/* There are public domain versions of cdb.c, cdb.h, cdb_make.c,
* cdb_make.h, and cdb_hash.c included in cdb-0.75 by Dan Bernstein.
*
* These files are distributed in integrit under the GPL and may have
* been modified from the versions in cdb-0.75.
*/
#include <config.h>
#include <stdio.h> /* for FILE * in struct cdb */
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
/* support platforms that don't yet conform to C99 */
#if HAVE_STDINT_H
#include <stdint.h>
#elif HAVE_INTTYPES_H
#include <inttypes.h>
#else
#error No stdint.h or inttypes.h found.
#endif
#include "cdb.h"
#include "cdb_hash.h"
#include "cdb_make.h"
#include "packint.h"
int cdb_make_start(struct cdb_make *c, FILE *newdb)
{
c->head = 0;
c->split = 0;
c->hash = 0;
c->numentries = 0;
c->fout = newdb;
c->pos = sizeof c->final;
return fseek(newdb, c->pos, SEEK_SET);
}
static int posplus(struct cdb_make *c,uint32_t len)
{
uint32_t newpos = c->pos + len;
if (newpos < len) {
errno = ENOMEM;
return -1;
}
c->pos = newpos;
return 0;
}
int cdb_make_addend(struct cdb_make *c,unsigned int keylen,unsigned int datalen,uint32_t h)
{
struct cdb_hplist *head;
head = c->head;
if (!head || (head->num >= CDB_HPLIST)) {
head = (struct cdb_hplist *) malloc(sizeof(struct cdb_hplist));
if (!head) return -1;
head->num = 0;
head->next = c->head;
c->head = head;
}
head->hp[head->num].h = h;
head->hp[head->num].p = c->pos;
++head->num;
++c->numentries;
if (posplus(c,8) == -1) return -1;
if (posplus(c,keylen) == -1) return -1;
if (posplus(c,datalen) == -1) return -1;
return 0;
}
int cdb_make_addbegin(struct cdb_make *c,unsigned int keylen,unsigned int datalen)
{
char buf[8];
if (keylen > 0xffffffff) {
errno = ENOMEM;
return -1;
}
if (datalen > 0xffffffff) {
errno = ENOMEM;
return -1;
}
UINT32_PACK(buf,keylen);
UINT32_PACK(buf + 4,datalen);
if (fwrite(buf, 8, 1, c->fout) < 1)
return -1;
return 0;
}
int cdb_make_add(struct cdb_make *c,char *key,unsigned int keylen,char *data,unsigned int datalen)
{
if (cdb_make_addbegin(c,keylen,datalen) == -1) return -1;
if (fwrite(key, keylen, 1, c->fout) < 1)
return -1;
if (fwrite(data, datalen, 1, c->fout) < 1)
return -1;
return cdb_make_addend(c,keylen,datalen,cdb_hash(key,keylen));
}
int cdb_make_finish(struct cdb_make *c)
{
char buf[8];
int i;
uint32_t len;
uint32_t u;
uint32_t memsize;
uint32_t count;
uint32_t where;
struct cdb_hplist *x;
struct cdb_hp *hp;
for (i = 0;i < 256;++i)
c->count[i] = 0;
for (x = c->head;x;x = x->next) {
i = x->num;
while (i--)
++c->count[255 & x->hp[i].h];
}
memsize = 1;
for (i = 0;i < 256;++i) {
u = c->count[i] * 2;
if (u > memsize)
memsize = u;
}
memsize += c->numentries; /* no overflow possible up to now */
u = (uint32_t) 0 - (uint32_t) 1;
u /= sizeof(struct cdb_hp);
if (memsize > u) {
errno = ENOMEM;
return -1;
}
c->split = (struct cdb_hp *) malloc(memsize * sizeof(struct cdb_hp));
if (!c->split) return -1;
c->hash = c->split + c->numentries;
u = 0;
for (i = 0;i < 256;++i) {
u += c->count[i]; /* bounded by numentries, so no overflow */
c->start[i] = u;
}
for (x = c->head;x;x = x->next) {
i = x->num;
while (i--)
c->split[--c->start[255 & x->hp[i].h]] = x->hp[i];
}
for (i = 0;i < 256;++i) {
count = c->count[i];
len = count + count; /* no overflow possible */
UINT32_PACK(c->final + 8 * i,c->pos);
UINT32_PACK(c->final + 8 * i + 4,len);
for (u = 0;u < len;++u)
c->hash[u].h = c->hash[u].p = 0;
hp = c->split + c->start[i];
for (u = 0;u < count;++u) {
where = (hp->h >> 8) % len;
while (c->hash[where].p)
if (++where == len)
where = 0;
c->hash[where] = *hp++;
}
for (u = 0;u < len;++u) {
UINT32_PACK(buf,c->hash[u].h);
UINT32_PACK(buf + 4,c->hash[u].p);
if (fwrite(buf, 8, 1, c->fout) < 1)
return -1;
if (posplus(c,8) == -1) return -1;
}
}
/* if (buffer_flush(&c->b) == -1) return -1; */
if (fseek(c->fout, 0L, SEEK_SET) == -1)
return -1;
return (fwrite(c->final, sizeof c->final, 1, c->fout) < 1) ? -1 : 1;
}