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php-src/ext/dba/dba_cdb.c
Sebastian Bergmann d1dded8751 MFH: Bump copyright year, 2 of 2.
2007-12-31 07:17:19 +00:00

351 lines
7.2 KiB
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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2008 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.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. |
+----------------------------------------------------------------------+
| Authors: Sascha Schumann <sascha@schumann.cx> |
| Marcus Boerger <helly@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#if DBA_CDB
#include "php_cdb.h"
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#if DBA_CDB_BUILTIN
# include "libcdb/cdb.h"
# include "libcdb/cdb_make.h"
# include "libcdb/uint32.h"
#else
# ifdef CDB_INCLUDE_FILE
# include CDB_INCLUDE_FILE
# endif
#endif
#define CDB_INFO \
dba_cdb *cdb = (dba_cdb *) info->dbf
typedef struct {
struct cdb c;
#if DBA_CDB_BUILTIN
struct cdb_make m;
php_stream *file;
int make;
#else
int file;
#endif
uint32 eod; /* size of constant database */
uint32 pos; /* current position for traversing */
} dba_cdb;
DBA_OPEN_FUNC(cdb)
{
#if DBA_CDB_BUILTIN
php_stream* file = 0;
int make;
#else
int file = 0;
#endif
dba_cdb *cdb;
dba_info *pinfo = (dba_info *) info;
switch (info->mode) {
case DBA_READER:
#if DBA_CDB_BUILTIN
make = 0;
file = info->fp;
#else
file = VCWD_OPEN(info->path, O_RDONLY);
if (file < 0) {
*error = "Unable to open file";
return FAILURE;
}
#endif
break;
#if DBA_CDB_BUILTIN
case DBA_TRUNC:
make = 1;
file = info->fp;
break;
case DBA_CREAT:
case DBA_WRITER:
*error = "Update operations are not supported";
return FAILURE; /* not supported */
#endif
default:
*error = "Currently not supported";
return FAILURE;
}
cdb = pemalloc(sizeof(dba_cdb), info->flags&DBA_PERSISTENT);
memset(cdb, 0, sizeof(dba_cdb));
#if DBA_CDB_BUILTIN
if (make) {
cdb_make_start(&cdb->m, file TSRMLS_CC);
} else {
cdb_init(&cdb->c, file TSRMLS_CC);
}
cdb->make = make;
#else
cdb_init(&cdb->c, file);
#endif
cdb->file = file;
pinfo->dbf = cdb;
return SUCCESS;
}
DBA_CLOSE_FUNC(cdb)
{
CDB_INFO;
/* cdb_free does not close associated file */
#if DBA_CDB_BUILTIN
if (cdb->make) {
cdb_make_finish(&cdb->m TSRMLS_CC);
} else {
cdb_free(&cdb->c TSRMLS_CC);
}
#else
cdb_free(&cdb->c);
close(cdb->file);
#endif
pefree(cdb, info->flags&DBA_PERSISTENT);
}
#if DBA_CDB_BUILTIN
# define php_cdb_read(cdb, buf, len, pos) cdb_read(cdb, buf, len, pos TSRMLS_CC)
# define php_cdb_findnext(cdb, key, len) cdb_findnext(cdb, key, len TSRMLS_CC)
# define php_cdb_find(cdb, key, len) cdb_find(cdb, key, len TSRMLS_CC)
#else
# define php_cdb_read(cdb, buf, len, pos) cdb_read(cdb, buf, len, pos)
# define php_cdb_findnext(cdb, key, len) cdb_findnext(cdb, key, len)
# define php_cdb_find(cdb, key, len) cdb_find(cdb, key, len)
#endif
DBA_FETCH_FUNC(cdb)
{
CDB_INFO;
unsigned int len;
char *new_entry = NULL;
#if DBA_CDB_BUILTIN
if (cdb->make)
return NULL; /* database was opened writeonly */
#endif
if (php_cdb_find(&cdb->c, key, keylen) == 1) {
while(skip--) {
if (php_cdb_findnext(&cdb->c, key, keylen) != 1) {
return NULL;
}
}
len = cdb_datalen(&cdb->c);
new_entry = safe_emalloc(len, 1, 1);
if (php_cdb_read(&cdb->c, new_entry, len, cdb_datapos(&cdb->c)) == -1) {
efree(new_entry);
return NULL;
}
new_entry[len] = 0;
if (newlen)
*newlen = len;
}
return new_entry;
}
DBA_UPDATE_FUNC(cdb)
{
#if DBA_CDB_BUILTIN
CDB_INFO;
if (!cdb->make)
return FAILURE; /* database was opened readonly */
if (!mode)
return FAILURE; /* cdb_make dosn't know replace */
if (cdb_make_add(&cdb->m, key, keylen, val, vallen TSRMLS_CC) != -1)
return SUCCESS;
#endif
return FAILURE;
}
DBA_EXISTS_FUNC(cdb)
{
CDB_INFO;
#if DBA_CDB_BUILTIN
if (cdb->make)
return FAILURE; /* database was opened writeonly */
#endif
if (php_cdb_find(&cdb->c, key, keylen) == 1)
return SUCCESS;
return FAILURE;
}
DBA_DELETE_FUNC(cdb)
{
return FAILURE; /* cdb doesn't support delete */
}
/* {{{ cdb_file_read */
#if DBA_CDB_BUILTIN
# define cdb_file_read(fildes, buf, size) php_stream_read(fildes, buf, size)
#else
# define cdb_file_read(fildes, buf, size) read(fildes, buf, size)
#endif
/* }}} */
#define CREAD(n) do { \
if (cdb_file_read(cdb->file, buf, n) < n) return NULL; \
} while (0)
/* {{{ cdb_file_lseek
php_stream_seek does not return actual position */
#if DBA_CDB_BUILTIN
int cdb_file_lseek(php_stream *fp, off_t offset, int whence TSRMLS_DC) {
php_stream_seek(fp, offset, whence);
return php_stream_tell(fp);
}
#else
int cdb_file_lseek(int fd, off_t offset, int whence TSRMLS_DC) {
return lseek(fd, offset, whence);
}
#endif
/* }}} */
#define CSEEK(n) do { \
if (n >= cdb->eod) return NULL; \
if (cdb_file_lseek(cdb->file, (off_t)n, SEEK_SET TSRMLS_CC) != (off_t) n) return NULL; \
} while (0)
DBA_FIRSTKEY_FUNC(cdb)
{
CDB_INFO;
uint32 klen, dlen;
char buf[8];
char *key;
#if DBA_CDB_BUILTIN
if (cdb->make)
return NULL; /* database was opened writeonly */
#endif
cdb->eod = -1;
CSEEK(0);
CREAD(4);
/* Total length of file in bytes */
uint32_unpack(buf, &cdb->eod);
CSEEK(2048);
CREAD(8);
/* The first four bytes contain the length of the key */
uint32_unpack(buf, &klen);
uint32_unpack(buf + 4, &dlen);
key = safe_emalloc(klen, 1, 1);
if (cdb_file_read(cdb->file, key, klen) < klen) {
efree(key);
key = NULL;
} else {
key[klen] = '\0';
if (newlen) *newlen = klen;
}
/* header + klenlen + dlenlen + klen + dlen */
cdb->pos = 2048 + 4 + 4 + klen + dlen;
return key;
}
DBA_NEXTKEY_FUNC(cdb)
{
CDB_INFO;
uint32 klen, dlen;
char buf[8];
char *key;
#if DBA_CDB_BUILTIN
if (cdb->make)
return NULL; /* database was opened writeonly */
#endif
CSEEK(cdb->pos);
CREAD(8);
uint32_unpack(buf, &klen);
uint32_unpack(buf + 4, &dlen);
key = safe_emalloc(klen, 1, 1);
if (cdb_file_read(cdb->file, key, klen) < klen) {
efree(key);
key = NULL;
} else {
key[klen] = '\0';
if (newlen) *newlen = klen;
}
cdb->pos += 8 + klen + dlen;
return key;
}
DBA_OPTIMIZE_FUNC(cdb)
{
return SUCCESS;
}
DBA_SYNC_FUNC(cdb)
{
/* this is read-only */
return SUCCESS;
}
DBA_INFO_FUNC(cdb)
{
#if DBA_CDB_BUILTIN
if (!strcmp(hnd->name, "cdb")) {
return estrdup(cdb_version());
} else {
return estrdup(cdb_make_version());
}
#else
return estrdup("External");
#endif
}
#endif
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
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