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// security - hide paths
if (!defined('ADODB_DIR')) die();

global $ADODB_INCLUDED_CSV;
$ADODB_INCLUDED_CSV = 1;

/* 

  V5.18 3 Sep 2012   (c) 2000-2012 John Lim (jlim#natsoft.com). All rights reserved.
  Released under both BSD license and Lesser GPL library license. 
  Whenever there is any discrepancy between the two licenses, 
  the BSD license will take precedence. See License.txt. 
  Set tabs to 4 for best viewing.
  
  Latest version is available at http://adodb.sourceforge.net
  
  Library for CSV serialization. This is used by the csv/proxy driver and is the 
  CacheExecute() serialization format. 
  
  ==== NOTE ====
  Format documented at http://php.weblogs.com/ADODB_CSV
  ==============
*/

	/**
 	 * convert a recordset into special format
	 *
	 * @param rs	the recordset
	 *
	 * @return	the CSV formated data
	 */
	function _rs2serialize(&amp;$rs,$conn=false,$sql='')
	{
		$max = ($rs) ? $rs-&gt;FieldCount() : 0;
		
		if ($sql) $sql = urlencode($sql);
		// metadata setup
		
		if ($max &lt;= 0 || $rs-&gt;dataProvider == 'empty') { // is insert/update/delete
			if (is_object($conn)) {
				$sql .= ','.$conn-&gt;Affected_Rows();
				$sql .= ','.$conn-&gt;Insert_ID();
			} else
				$sql .= ',,';
			
			$text = &quot;====-1,0,$sql\n&quot;;
			return $text;
		}
		$tt = ($rs-&gt;timeCreated) ? $rs-&gt;timeCreated : time();
		
		## changed format from ====0 to ====1
		$line = &quot;====1,$tt,$sql\n&quot;;
		
		if ($rs-&gt;databaseType == 'array') {
			$rows = $rs-&gt;_array;
		} else {
			$rows = array();
			while (!$rs-&gt;EOF) {	
				$rows[] = $rs-&gt;fields;
				$rs-&gt;MoveNext();
			} 
		}
		
		for($i=0; $i &lt; $max; $i++) {
			$o = $rs-&gt;FetchField($i);
			$flds[] = $o;
		}
	
		$savefetch = isset($rs-&gt;adodbFetchMode) ? $rs-&gt;adodbFetchMode : $rs-&gt;fetchMode;
		$class = $rs-&gt;connection-&gt;arrayClass;
		$rs2 = new $class();
		$rs2-&gt;timeCreated = $rs-&gt;timeCreated; # memcache fix
		$rs2-&gt;sql = $rs-&gt;sql;
		$rs2-&gt;oldProvider = $rs-&gt;dataProvider; 
		$rs2-&gt;InitArrayFields($rows,$flds);
		$rs2-&gt;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 $timeout secs
*
* @return		recordset, or false if error occured. If no
*			error occurred in sql INSERT/UPDATE/DELETE, 
*			empty recordset is returned
*/
	function csv2rs($url,&amp;$err,$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, &quot;,&quot;)) {
			// 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 ($meta[0] == &quot;====-1&quot;) {
					if (sizeof($meta) &lt; 5) {
						$err = &quot;Corrupt first line for format -1&quot;;
						fclose($fp);
						return $false;
					}
					fclose($fp);
					
					if ($timeout &gt; 0) {
						$err = &quot; Illegal Timeout $timeout &quot;;
						return $false;
					}
					
					$rs = new $rsclass($val=true);
					$rs-&gt;fields = array();
					$rs-&gt;timeCreated = $meta[1];
					$rs-&gt;EOF = true;
					$rs-&gt;_numOfFields = 0;
					$rs-&gt;sql = urldecode($meta[2]);
					$rs-&gt;affectedrows = (integer)$meta[3];
					$rs-&gt;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) &gt; 1) {
					if($timeout &gt;0){ 
						$tdiff = (integer)( $meta[1]+$timeout - time());
						if ($tdiff &lt;= 2) {
							switch($tdiff) {
							case 4:
							case 3:
								if ((rand() &amp; 31) == 0) {
									fclose($fp);
									$err = &quot;Timeout 3&quot;;
									return $false;
								}
								break;
							case 2: 
								if ((rand() &amp; 15) == 0) {
									fclose($fp);
									$err = &quot;Timeout 2&quot;;
									return $false;
								}
								break;
							case 1:
								if ((rand() &amp; 3) == 0) {
									fclose($fp);
									$err = &quot;Timeout 1&quot;;
									return $false;
								}
								break;
							default: 
								fclose($fp);
								$err = &quot;Timeout 0&quot;;
								return $false;
							} // switch
							
						} // if check flush cache
					}// (timeout&gt;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-&gt;timeCreated = $ttl;
					else {
						$err = &quot;Unable to unserialize recordset&quot;;
						//echo htmlspecialchars($text),' !--END--!&lt;p&gt;';
					}
					return $rs;
				}
				
				$meta = false;
				$meta = fgetcsv($fp, 32000, &quot;,&quot;);
				if (!$meta) {
					fclose($fp);
					$err = &quot;Unexpected EOF 1&quot;;
					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();
				$fld-&gt;name = urldecode($o2[0]);
				$fld-&gt;type = $o2[1];
				$fld-&gt;max_length = $o2[2];
				$flds[] = $fld;
			}
		} else {
			fclose($fp);
			$err = &quot;Recordset had unexpected EOF 2&quot;;
			return $false;
		}
		
		// slurp in the data
		$MAXSIZE = 128000;
		
		$text = '';
		while ($txt = fread($fp,$MAXSIZE)) {
			$text .= $txt;
		}
			
		fclose($fp);
		@$arr = unserialize($text);
		//var_dump($arr);
		if (!is_array($arr)) {
			$err = &quot;Recordset had unexpected EOF (in serialized recordset)&quot;;
			if (get_magic_quotes_runtime()) $err .= &quot;. Magic Quotes Runtime should be disabled!&quot;;
			return $false;
		}
		$rs = new $rsclass();
		$rs-&gt;timeCreated = $ttl;
		$rs-&gt;InitArrayFields($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( &quot; Rename $tmpname &quot;.($ok? 'ok' : 'failed'));
				}
			}
			return $ok;
		}
		if (!($fd = @fopen($filename, 'a'))) return false;
		if (flock($fd, LOCK_EX) &amp;&amp; ftruncate($fd, 0)) {
			if (fwrite( $fd, $contents )) $ok = true;
			else $ok = false;
			fclose($fd);
			@chmod($filename,0644);
		}else {
			fclose($fd);
			if ($debug)ADOConnection::outp( &quot; Failed acquiring lock for $filename&lt;br&gt;\n&quot;);
			$ok = false;
		}
	
		return $ok;
	}
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