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<?php
/**
* Library for CSV serialization.
*
* This is used by the csv/proxy driver and is the CacheExecute()
* serialization format.
*
* This file is part of ADOdb, a Database Abstraction Layer library for PHP.
*
* @package ADOdb
* @link https://adodb.org Project's web site and documentation
* @link https://github.com/ADOdb/ADOdb Source code and issue tracker
*
* The ADOdb Library is dual-licensed, released under both the BSD 3-Clause
* and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,
* any later version. This means you can use it in proprietary products.
* See the LICENSE.md file distributed with this source code for details.
* @license BSD-3-Clause
* @license LGPL-2.1-or-later
*
* @copyright 2000-2013 John Lim
* @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community
*/
// security - hide paths
if (!defined('ADODB_DIR')) die();
global $ADODB_INCLUDED_CSV;
$ADODB_INCLUDED_CSV = 1;
/**
* convert a recordset into special format
*
* @param rs the recordset
*
* @return the CSV formatted data
*/
function _rs2serialize(&$rs,$conn=false,$sql='')
{
$max = ($rs) ? $rs->FieldCount() : 0;
if ($sql) $sql = urlencode($sql);
// metadata setup
if ($max <= 0 || $rs->dataProvider == 'empty') { // is insert/update/delete
if (is_object($conn)) {
$sql .= ','.$conn->Affected_Rows();
$sql .= ','.$conn->Insert_ID();
} else
$sql .= ',,';
$text = "====-1,0,$sql\n";
return $text;
}
$tt = ($rs->timeCreated) ? $rs->timeCreated : time();
## changed format from ====0 to ====1
$line = "====1,$tt,$sql\n";
if ($rs->databaseType == 'array') {
$rows = $rs->_array;
} else {
$rows = array();
while (!$rs->EOF) {
$rows[] = $rs->fields;
$rs->MoveNext();
}
}
for($i=0; $i < $max; $i++) {
$o = $rs->FetchField($i);
$flds[] = $o;
}
$savefetch = isset($rs->adodbFetchMode) ? $rs->adodbFetchMode : $rs->fetchMode;
$class = $rs->connection->arrayClass;
$rs2 = new $class();
$rs2->timeCreated = $rs->timeCreated; # memcache fix
$rs2->sql = $rs->sql;
$rs2->oldProvider = $rs->dataProvider;
$rs2->InitArrayFields($rows,$flds);
$rs2->fetchMode = $savefetch;
return $line.serialize($rs2);
}
/**
* Open CSV file and convert it into Data.
*
* @param url file/ftp/http url
* @param err returns the error message
* @param timeout dispose if recordset has been alive for $timeout secs
*
* @return recordset, or false if error occurred. If no
* error occurred in sql INSERT/UPDATE/DELETE,
* empty recordset is returned
*/
function csv2rs($url,&$err,$timeout=0, $rsclass='ADORecordSet_array')
{
$false = false;
$err = false;
$fp = @fopen($url,'rb');
if (!$fp) {
$err = $url.' file/URL not found';
return $false;
}
@flock($fp, LOCK_SH);
$arr = array();
$ttl = 0;
if ($meta = fgetcsv($fp, 32000, ",")) {
// check if error message
if (strncmp($meta[0],'****',4) === 0) {
$err = trim(substr($meta[0],4,1024));
fclose($fp);
return $false;
}
// check for meta data
// $meta[0] is -1 means return an empty recordset
// $meta[1] contains a time
if (strncmp($meta[0], '====',4) === 0) {
if ($meta[0] == "====-1") {
if (sizeof($meta) < 5) {
$err = "Corrupt first line for format -1";
fclose($fp);
return $false;
}
fclose($fp);
if ($timeout > 0) {
$err = " Illegal Timeout $timeout ";
return $false;
}
$rs = new $rsclass($val=true);
$rs->fields = array();
$rs->timeCreated = $meta[1];
$rs->EOF = true;
$rs->_numOfFields = 0;
$rs->sql = urldecode($meta[2]);
$rs->affectedrows = (integer)$meta[3];
$rs->insertid = $meta[4];
return $rs;
}
# Under high volume loads, we want only 1 thread/process to _write_file
# so that we don't have 50 processes queueing to write the same data.
# We use probabilistic timeout, ahead of time.
#
# -4 sec before timeout, give processes 1/32 chance of timing out
# -2 sec before timeout, give processes 1/16 chance of timing out
# -1 sec after timeout give processes 1/4 chance of timing out
# +0 sec after timeout, give processes 100% chance of timing out
if (sizeof($meta) > 1) {
if($timeout >0){
$tdiff = (integer)( $meta[1]+$timeout - time());
if ($tdiff <= 2) {
switch($tdiff) {
case 4:
case 3:
if ((rand() & 31) == 0) {
fclose($fp);
$err = "Timeout 3";
return $false;
}
break;
case 2:
if ((rand() & 15) == 0) {
fclose($fp);
$err = "Timeout 2";
return $false;
}
break;
case 1:
if ((rand() & 3) == 0) {
fclose($fp);
$err = "Timeout 1";
return $false;
}
break;
default:
fclose($fp);
$err = "Timeout 0";
return $false;
} // switch
} // if check flush cache
}// (timeout>0)
$ttl = $meta[1];
}
//================================================
// new cache format - use serialize extensively...
if ($meta[0] === '====1') {
// slurp in the data
$MAXSIZE = 128000;
$text = fread($fp,$MAXSIZE);
if (strlen($text)) {
while ($txt = fread($fp,$MAXSIZE)) {
$text .= $txt;
}
}
fclose($fp);
$rs = unserialize($text);
if (is_object($rs)) $rs->timeCreated = $ttl;
else {
$err = "Unable to unserialize recordset";
//echo htmlspecialchars($text),' !--END--!<p>';
}
return $rs;
}
$meta = false;
$meta = fgetcsv($fp, 32000, ",");
if (!$meta) {
fclose($fp);
$err = "Unexpected EOF 1";
return $false;
}
}
// Get Column definitions
$flds = array();
foreach($meta as $o) {
$o2 = explode(':',$o);
if (sizeof($o2)!=3) {
$arr[] = $meta;
$flds = false;
break;
}
$fld = new ADOFieldObject();
$fld->name = urldecode($o2[0]);
$fld->type = $o2[1];
$fld->max_length = $o2[2];
$flds[] = $fld;
}
} else {
fclose($fp);
$err = "Recordset had unexpected EOF 2";
return $false;
}
// slurp in the data
$MAXSIZE = 128000;
$text = '';
while ($txt = fread($fp,$MAXSIZE)) {
$text .= $txt;
}
fclose($fp);
@$arr = unserialize($text);
if (!is_array($arr)) {
$err = "Recordset had unexpected EOF (in serialized recordset)";
return $false;
}
$rs = new $rsclass();
$rs->timeCreated = $ttl;
$rs->InitArrayFields($arr,$flds);
return $rs;
}
/**
* Save a file $filename and its $contents (normally for caching) with file locking
* Returns true if ok, false if fopen/fwrite error, 0 if rename error (eg. file is locked)
*/
function adodb_write_file($filename, $contents,$debug=false)
{
# http://www.php.net/bugs.php?id=9203 Bug that flock fails on Windows
# So to simulate locking, we assume that rename is an atomic operation.
# First we delete $filename, then we create a $tempfile write to it and
# rename to the desired $filename. If the rename works, then we successfully
# modified the file exclusively.
# What a stupid need - having to simulate locking.
# Risks:
# 1. $tempfile name is not unique -- very very low
# 2. unlink($filename) fails -- ok, rename will fail
# 3. adodb reads stale file because unlink fails -- ok, $rs timeout occurs
# 4. another process creates $filename between unlink() and rename() -- ok, rename() fails and cache updated
if (strncmp(PHP_OS,'WIN',3) === 0) {
// skip the decimal place
$mtime = substr(str_replace(' ','_',microtime()),2);
// getmypid() actually returns 0 on Win98 - never mind!
$tmpname = $filename.uniqid($mtime).getmypid();
if (!($fd = @fopen($tmpname,'w'))) return false;
if (fwrite($fd,$contents)) $ok = true;
else $ok = false;
fclose($fd);
if ($ok) {
@chmod($tmpname,0644);
// the tricky moment
@unlink($filename);
if (!@rename($tmpname,$filename)) {
@unlink($tmpname);
$ok = 0;
}
if (!$ok) {
if ($debug) ADOConnection::outp( " Rename $tmpname ".($ok? 'ok' : 'failed'));
}
}
return $ok;
}
if (!($fd = @fopen($filename, 'a'))) return false;
if (flock($fd, LOCK_EX) && ftruncate($fd, 0)) {
if (fwrite( $fd, $contents )) $ok = true;
else $ok = false;
fclose($fd);
@chmod($filename,0644);
}else {
fclose($fd);
if ($debug)ADOConnection::outp( " Failed acquiring lock for $filename<br>\n");
$ok = false;
}
return $ok;
}