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/*
integrit - file integrity verification system
Copyright (C) 2000, 2001 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>
#if DEBUG
#include <stdio.h>
#endif
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/mman.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 "packint.h"
#ifndef CDB_MMAP_MAX
#warning CDB_MAX_MMAP not defined. Using default (0xffffffff)
#define CDB_MMAP_MAX 0xffffffff
#endif
void cdb_free(struct cdb *c)
{
if (c->map) {
munmap(c->map,c->size);
c->map = 0;
}
}
void cdb_findstart(struct cdb *c)
{
c->loop = 0;
}
void cdb_init(struct cdb *c,int fd)
{
struct stat st;
char *x;
cdb_free(c);
cdb_findstart(c);
c->fd = fd;
if (fstat(fd,&st) == 0) {
if (st.st_size <= CDB_MMAP_MAX) {
#if DEBUG
fputs("debug: using mmap for cdb\n", stderr);
#endif
x = mmap(0,st.st_size,PROT_READ,MAP_SHARED,fd,0);
if (x + 1) {
c->size = st.st_size;
c->map = x;
}
}
#if DEBUG
else {
fputs("debug: NOT using mmap for cdb\n", stderr);
}
#endif
}
}
int cdb_read(struct cdb *c,char *buf,unsigned int len,uint32_t pos)
{
if (c->map) {
if ((pos > c->size) || (c->size - pos < len)) goto FORMAT;
memmove(buf, c->map + pos, len);
}
else {
if (lseek(c->fd, pos, SEEK_SET) == -1)
return -1;
while (len > 0) {
int r;
do {
r = read(c->fd,buf,len);
} while ((r == -1) && (errno == EINTR));
if (r == -1) return -1;
if (r == 0) goto FORMAT;
buf += r;
len -= r;
}
}
return 0;
FORMAT:
errno = EINVAL;
return -1;
}
static int match(struct cdb *c,char *key,unsigned int len,uint32_t pos)
{
char buf[32];
int n;
while (len > 0) {
n = sizeof buf;
if (n > len) n = len;
if (cdb_read(c,buf,n,pos) == -1) return -1;
/* if (byte_diff(buf,n,key)) return 0; */
if (memcmp(buf, key, n))
return 0;
pos += n;
key += n;
len -= n;
}
return 1;
}
int cdb_findnext(struct cdb *c,char *key,unsigned int len)
{
char buf[8];
uint32_t pos;
uint32_t u;
if (!c->loop) {
u = cdb_hash(key,len);
if (cdb_read(c,buf,8,(u << 3) & 2047) == -1) return -1;
UINT32_UNPACK(buf + 4,&c->hslots);
if (!c->hslots) return 0;
UINT32_UNPACK(buf,&c->hpos);
c->khash = u;
u >>= 8;
u %= c->hslots;
u <<= 3;
c->kpos = c->hpos + u;
}
while (c->loop < c->hslots) {
if (cdb_read(c,buf,8,c->kpos) == -1) return -1;
UINT32_UNPACK(buf + 4,&pos);
if (!pos) return 0;
c->loop += 1;
c->kpos += 8;
if (c->kpos == c->hpos + (c->hslots << 3)) c->kpos = c->hpos;
UINT32_UNPACK(buf,&u);
if (u == c->khash) {
if (cdb_read(c,buf,8,pos) == -1) return -1;
UINT32_UNPACK(buf,&u);
if (u == len)
switch(match(c,key,len,pos + 8)) {
case -1:
return -1;
case 1:
UINT32_UNPACK(buf + 4,&c->dlen);
c->dpos = pos + 8 + len;
return 1;
}
}
}
return 0;
}
int cdb_find(struct cdb *c,char *key,unsigned int len)
{
cdb_findstart(c);
return cdb_findnext(c,key,len);
}
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