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/*
integrit - file integrity verification system
Copyright (C) 2000, 2001, 2002 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.
*/
#include <config.h>
#include <stdio.h> /* for FILE * in struct cdb */
#include <stdlib.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_make.h"
#include "elcerror.h"
#include "cdb_seq.h"
#include "packint.h"
#define CDB_HEADER_SIZE (2048)
/* endian issues will bite us if we don't call uint32_unpack when
* reading numbers from the cdb file, so we do it here. */
static int read_uint32(int fd, uint32_t *n)
{
unsigned char buf[4];
ssize_t err;
if ( (err = read(fd, &buf, sizeof(*n))) == -1)
return -1;
else if (err == 0)
return 1;
else if (err < sizeof(buf)) {
/* Error: could not read a whole uint32_t */
errno = EIO; /* ENODATA not on FreeBSD */
return -1;
}
UINT32_UNPACK(buf, n);
return 0;
}
int cdb_seq_start(cdb_seq *c)
{
long int err;
int fd = c->fd;
if ( (err = lseek(fd, 0, SEEK_SET)) == -1)
return -1;
if ( (err = read_uint32(fd, &c->eod)) == -1)
return -1;
else if (err == 1) { /* no more data */
errno = EIO;
return -1;
}
if ( (err = lseek(fd, CDB_HEADER_SIZE, SEEK_SET)) == -1) {
return -1;
} else if (err != CDB_HEADER_SIZE) {
errno = EIO; /* short read on cdb header */
return -1;
}
return 0;
}
int cdb_seq_eod(cdb_seq *c)
{
off_t pos;
if ( (pos = lseek(c->fd, 0, SEEK_CUR)) == -1)
return -1;
return pos >= c->eod;
}
int cdb_seq_sizes(cdb_seq *c, size_t *klen, size_t *vlen)
{
ssize_t err;
uint32_t n;
if ( (err = read_uint32(c->fd, &n)) == -1)
return -1;
else if (err == 1)
return 1; /* no more data */
*klen = n;
if ( (err = read_uint32(c->fd, &n)) == -1)
return -1;
else if (err == 1)
return 1; /* no more data */
*vlen = n;
return 0;
}
int cdb_seq_get(cdb_seq *c, void *key, size_t klen, void *data, size_t dlen)
{
ssize_t err;
if ( (err = read(c->fd, key, klen)) == -1) {
return -1;
} else if (err == 0) {
return 1; /* no more data */
} else if (err < klen) {
errno = EIO; /* I/O error */
return -1; /* short read */
}
if ( (err = read(c->fd, data, dlen)) == -1) {
return -1;
} else if (err == 0) {
return 1; /* no more data */
} else if (err < dlen) {
errno = EIO; /* I/O error */
return -1; /* short read */
}
return 0;
}
int cdb_seq_getkey(cdb_seq *c, void *key, size_t klen, size_t dlen)
{
ssize_t err;
if ( (err = read(c->fd, key, klen)) == -1) {
return -1;
} else if (err == 0) {
return 1; /* no more */
} else if (err < klen) {
errno = EIO; /* I/O error */
return -1; /* short read */
}
if (lseek(c->fd, dlen, SEEK_CUR) == -1)
return -1;
return 0;
}
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