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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: Marcus Boerger <helly@php.net> |
| based on ext/db/db.c by: |
| Rasmus Lerdorf <rasmus@php.net> |
| Jim Winstead <jimw@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "php_globals.h"
#include "safe_mode.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "flatfile.h"
#define FLATFILE_BLOCK_SIZE 1024
/*
* ret = -1 means that database was opened for read-only
* ret = 0 success
* ret = 1 key already exists - nothing done
*/
/* {{{ flatfile_store
*/
int flatfile_store(flatfile *dba, datum key_datum, datum value_datum, int mode TSRMLS_DC) {
if (mode == FLATFILE_INSERT) {
if (flatfile_findkey(dba, key_datum TSRMLS_CC)) {
return 1;
}
php_stream_seek(dba->fp, 0L, SEEK_END);
php_stream_printf(dba->fp TSRMLS_CC, "%d\n", key_datum.dsize);
php_stream_flush(dba->fp);
if (php_stream_write(dba->fp, key_datum.dptr, key_datum.dsize) < key_datum.dsize) {
return -1;
}
php_stream_printf(dba->fp TSRMLS_CC, "%d\n", value_datum.dsize);
php_stream_flush(dba->fp);
if (php_stream_write(dba->fp, value_datum.dptr, value_datum.dsize) < value_datum.dsize) {
return -1;
}
} else { /* FLATFILE_REPLACE */
flatfile_delete(dba, key_datum TSRMLS_CC);
php_stream_printf(dba->fp TSRMLS_CC, "%d\n", key_datum.dsize);
php_stream_flush(dba->fp);
if (php_stream_write(dba->fp, key_datum.dptr, key_datum.dsize) < key_datum.dsize) {
return -1;
}
php_stream_printf(dba->fp TSRMLS_CC, "%d\n", value_datum.dsize);
if (php_stream_write(dba->fp, value_datum.dptr, value_datum.dsize) < value_datum.dsize) {
return -1;
}
}
php_stream_flush(dba->fp);
return 0;
}
/* }}} */
/* {{{ flatfile_fetch
*/
datum flatfile_fetch(flatfile *dba, datum key_datum TSRMLS_DC) {
datum value_datum = {NULL, 0};
char buf[16];
if (flatfile_findkey(dba, key_datum TSRMLS_CC)) {
if (php_stream_gets(dba->fp, buf, sizeof(buf))) {
value_datum.dsize = atoi(buf);
value_datum.dptr = safe_emalloc(value_datum.dsize, 1, 1);
value_datum.dsize = php_stream_read(dba->fp, value_datum.dptr, value_datum.dsize);
} else {
value_datum.dptr = NULL;
value_datum.dsize = 0;
}
}
return value_datum;
}
/* }}} */
/* {{{ flatfile_delete
*/
int flatfile_delete(flatfile *dba, datum key_datum TSRMLS_DC) {
char *key = key_datum.dptr;
size_t size = key_datum.dsize;
size_t buf_size = FLATFILE_BLOCK_SIZE;
char *buf = emalloc(buf_size);
size_t num;
size_t pos;
php_stream_rewind(dba->fp);
while(!php_stream_eof(dba->fp)) {
/* read in the length of the key name */
if (!php_stream_gets(dba->fp, buf, 15)) {
break;
}
num = atoi(buf);
if (num >= buf_size) {
buf_size = num + FLATFILE_BLOCK_SIZE;
buf = erealloc(buf, buf_size);
}
pos = php_stream_tell(dba->fp);
/* read in the key name */
num = php_stream_read(dba->fp, buf, num);
if (num < 0) {
break;
}
if (size == num && !memcmp(buf, key, size)) {
php_stream_seek(dba->fp, pos, SEEK_SET);
php_stream_putc(dba->fp, 0);
php_stream_flush(dba->fp);
php_stream_seek(dba->fp, 0L, SEEK_END);
efree(buf);
return SUCCESS;
}
/* read in the length of the value */
if (!php_stream_gets(dba->fp, buf, 15)) {
break;
}
num = atoi(buf);
if (num >= buf_size) {
buf_size = num + FLATFILE_BLOCK_SIZE;
buf = erealloc(buf, buf_size);
}
/* read in the value */
num = php_stream_read(dba->fp, buf, num);
if (num < 0) {
break;
}
}
efree(buf);
return FAILURE;
}
/* }}} */
/* {{{ flatfile_findkey
*/
int flatfile_findkey(flatfile *dba, datum key_datum TSRMLS_DC) {
size_t buf_size = FLATFILE_BLOCK_SIZE;
char *buf = emalloc(buf_size);
size_t num;
int ret=0;
void *key = key_datum.dptr;
size_t size = key_datum.dsize;
php_stream_rewind(dba->fp);
while (!php_stream_eof(dba->fp)) {
if (!php_stream_gets(dba->fp, buf, 15)) {
break;
}
num = atoi(buf);
if (num >= buf_size) {
buf_size = num + FLATFILE_BLOCK_SIZE;
buf = erealloc(buf, buf_size);
}
num = php_stream_read(dba->fp, buf, num);
if (num < 0) {
break;
}
if (size == num) {
if (!memcmp(buf, key, size)) {
ret = 1;
break;
}
}
if (!php_stream_gets(dba->fp, buf, 15)) {
break;
}
num = atoi(buf);
if (num >= buf_size) {
buf_size = num + FLATFILE_BLOCK_SIZE;
buf = erealloc(buf, buf_size);
}
num = php_stream_read(dba->fp, buf, num);
if (num < 0) {
break;
}
}
efree(buf);
return ret;
}
/* }}} */
/* {{{ flatfile_firstkey
*/
datum flatfile_firstkey(flatfile *dba TSRMLS_DC) {
datum res;
size_t num;
size_t buf_size = FLATFILE_BLOCK_SIZE;
char *buf = emalloc(buf_size);
php_stream_rewind(dba->fp);
while(!php_stream_eof(dba->fp)) {
if (!php_stream_gets(dba->fp, buf, 15)) {
break;
}
num = atoi(buf);
if (num >= buf_size) {
buf_size = num + FLATFILE_BLOCK_SIZE;
buf = erealloc(buf, buf_size);
}
num = php_stream_read(dba->fp, buf, num);
if (num < 0) {
break;
}
if (*(buf) != 0) {
dba->CurrentFlatFilePos = php_stream_tell(dba->fp);
res.dptr = buf;
res.dsize = num;
return res;
}
if (!php_stream_gets(dba->fp, buf, 15)) {
break;
}
num = atoi(buf);
if (num >= buf_size) {
buf_size = num + FLATFILE_BLOCK_SIZE;
buf = erealloc(buf, buf_size);
}
num = php_stream_read(dba->fp, buf, num);
if (num < 0) {
break;
}
}
efree(buf);
res.dptr = NULL;
res.dsize = 0;
return res;
}
/* }}} */
/* {{{ flatfile_nextkey
*/
datum flatfile_nextkey(flatfile *dba TSRMLS_DC) {
datum res;
size_t num;
size_t buf_size = FLATFILE_BLOCK_SIZE;
char *buf = emalloc(buf_size);
php_stream_seek(dba->fp, dba->CurrentFlatFilePos, SEEK_SET);
while(!php_stream_eof(dba->fp)) {
if (!php_stream_gets(dba->fp, buf, 15)) {
break;
}
num = atoi(buf);
if (num >= buf_size) {
buf_size = num + FLATFILE_BLOCK_SIZE;
buf = erealloc(buf, buf_size);
}
num = php_stream_read(dba->fp, buf, num);
if (num < 0) {
break;
}
if (!php_stream_gets(dba->fp, buf, 15)) {
break;
}
num = atoi(buf);
if (num >= buf_size) {
buf_size = num + FLATFILE_BLOCK_SIZE;
buf = erealloc(buf, buf_size);
}
num = php_stream_read(dba->fp, buf, num);
if (num < 0) {
break;
}
if (*(buf)!=0) {
dba->CurrentFlatFilePos = php_stream_tell(dba->fp);
res.dptr = buf;
res.dsize = num;
return res;
}
}
efree(buf);
res.dptr = NULL;
res.dsize = 0;
return res;
}
/* }}} */
/* {{{ flatfile_version */
char *flatfile_version()
{
return "1.0, $Revision$";
}
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
|
