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|
/*
+----------------------------------------------------------------------+
| PHP Version 4 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2002 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.02 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_02.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Sascha Schumann <sascha@schumann.cx> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#if DBA_CDB
#include "php_cdb.h"
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <cdb.h>
#include <cdbmake.h>
#define CDB_INFO \
dba_cdb *cdb = (dba_cdb *) info->dbf
typedef struct {
int fd;
uint32 eod; /* size of constant database */
uint32 pos; /* current position for traversing */
} dba_cdb;
DBA_OPEN_FUNC(cdb)
{
int gmode = 0;
dba_cdb *cdb;
dba_info *pinfo = (dba_info *) info;
switch(info->mode) {
case DBA_READER:
gmode = O_RDONLY; break;
/* currently not supported: */
#if 0
case DBA_WRITER:
gmode = O_RDWR; break;
#endif
default:
return FAILURE;
}
cdb = malloc(sizeof *cdb);
memset(cdb, 0, sizeof *cdb);
cdb->fd = VCWD_OPEN(info->path, gmode);
if(cdb->fd < 0) {
free(cdb);
return FAILURE;
}
pinfo->dbf = cdb;
return SUCCESS;
}
DBA_CLOSE_FUNC(cdb)
{
CDB_INFO;
close(cdb->fd);
free(cdb);
}
DBA_FETCH_FUNC(cdb)
{
CDB_INFO;
int len;
char *new = NULL;
if(cdb_seek(cdb->fd, key, keylen, &len) == 1) {
new = emalloc(len);
read(cdb->fd, new, len);
if(newlen) *newlen = len;
}
return new;
}
DBA_UPDATE_FUNC(cdb)
{
/* if anyone figures out cdbmake.c, let me know */
return FAILURE;
}
DBA_EXISTS_FUNC(cdb)
{
CDB_INFO;
int len;
if(cdb_seek(cdb->fd, key, keylen, &len) == 1)
return SUCCESS;
return FAILURE;
}
DBA_DELETE_FUNC(cdb)
{
return FAILURE;
}
#define CREAD(n) if(read(cdb->fd, buf, n) < n) return NULL
#define CSEEK(n) \
if(n >= cdb->eod) return NULL; \
if(lseek(cdb->fd, (off_t)n, SEEK_SET) != (off_t) n) return NULL
DBA_FIRSTKEY_FUNC(cdb)
{
CDB_INFO;
uint32 len;
char buf[8];
char *key;
cdb->eod = -1;
CSEEK(0);
CREAD(4);
cdb->eod = cdb_unpack(buf);
CSEEK(2048);
CREAD(8);
len = cdb_unpack(buf);
key = emalloc(len + 1);
if(read(cdb->fd, key, len) < len) {
efree(key);
key = NULL;
} else
key[len] = '\0';
/* header + klenlen + dlenlen + klen + dlen */
cdb->pos = 2048 + 4 + 4 + len + cdb_unpack(buf + 4);
return key;
}
DBA_NEXTKEY_FUNC(cdb)
{
CDB_INFO;
uint32 len;
char buf[8];
char *nkey;
CSEEK(cdb->pos);
CREAD(8);
len = cdb_unpack(buf);
nkey = emalloc(len + 1);
if(read(cdb->fd, nkey, len) < len) {
efree(nkey);
return NULL;
}
nkey[len] = '\0';
if(newlen) *newlen = len;
cdb->pos += 8 + len + cdb_unpack(buf + 4);
return nkey;
#if 0
/* this code cdb_seeks and is thus slower than directly seeking
in the file */
CDB_INFO;
char *nkey = NULL;
uint32 len;
char buf[8];
if(cdb_seek(cdb->fd, key, keylen, &len) == 1) {
if(lseek(cdb->fd, (off_t) len, SEEK_CUR) >= (off_t) cdb->eod)
return NULL;
CREAD(8);
len = cdb_unpack(buf);
nkey = emalloc(len + 1);
if(read(cdb->fd, nkey, len) < len) {
efree(nkey);
nkey = NULL;
} else
nkey[len] = '\0';
}
return nkey;
#endif
}
DBA_OPTIMIZE_FUNC(cdb)
{
return SUCCESS;
}
DBA_SYNC_FUNC(cdb)
{
/* this is read-only */
return SUCCESS;
}
#endif
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
|
