roundcubemail/program/lib/imap.inc

<?php
/////////////////////////////////////////////////////////
//	
//	Iloha IMAP Library (IIL)
//
//	(C)Copyright 2002 Ryo Chijiiwa <Ryo@IlohaMail.org>
//
//	This file is part of IlohaMail. IlohaMail is free software released 
//	under the GPL license.  See enclosed file COPYING for details, or 
//	see http://www.fsf.org/copyleft/gpl.html
//
/////////////////////////////////////////////////////////

/********************************************************

	FILE: include/imap.inc
	PURPOSE:
		Provide alternative IMAP library that doesn't rely on the standard 
		C-Client based version.  This allows IlohaMail to function regardless
		of whether or not the PHP build it's running on has IMAP functionality
		built-in.
	USEAGE:
		Function containing "_C_" in name require connection handler to be
		passed as one of the parameters.  To obtain connection handler, use
		iil_Connect()
	VERSION:
		IlohaMail-0.9-20050415
	CHANGES:
		File altered by Thomas Bruederli <roundcube@gmail.com>
		to fit enhanced equirements by the RoundCube Webmail:
		- Added list of server capabilites and check these before invoking commands
		- Added junk flag to iilBasicHeader
		- Enhanced error reporting on fsockopen()
		- Additional parameter for SORT command
		- Removed Call-time pass-by-reference because deprecated
		- Parse charset from content-type in iil_C_FetchHeaders()
		- Enhanced heaer sorting
		- Pass message as reference in iil_C_Append (to save memory)
		- Added BCC and REFERENCE to the list of headers to fetch in iil_C_FetchHeaders()
		- Leave messageID unchanged in iil_C_FetchHeaders()
		- Avoid stripslahes in iil_Connect()
		- Escape quotes and backslashes in iil_C_Login()
		- Added patch to iil_SortHeaders() by Richard Green
		- Removed <br> from error messages (better for logging)
		- Added patch to iil_C_Sort() enabling UID SORT commands
		- Added function iil_C_ID2UID()
		- Casting date parts in iil_StrToTime() to avoid mktime() warnings
		- Also acceppt LIST responses in iil_C_ListSubscribed()
		- Sanity check of $message_set in iil_C_FetchHeaders(), iil_C_FetchHeaderIndex(), iil_C_FetchThreadHeaders()
		- Implemented UID FETCH in iil_C_FetchHeaders()
		- Abort do-loop on socket errors (fgets returns false)
		- Removed some debuggers (echo ...)

********************************************************/


// changed path to work within roundcube webmail
include_once("lib/icl_commons.inc");


if (!$IMAP_USE_HEADER_DATE) $IMAP_USE_INTERNAL_DATE = true;
$IMAP_MONTHS=array("Jan"=>1,"Feb"=>2,"Mar"=>3,"Apr"=>4,"May"=>5,"Jun"=>6,"Jul"=>7,"Aug"=>8,"Sep"=>9,"Oct"=>10,"Nov"=>11,"Dec"=>12);
$IMAP_SERVER_TZ = date('Z');

$iil_error;
$iil_errornum;
$iil_selected;

class iilConnection{
	var $fp;
	var $error;
	var $errorNum;
	var $selected;
	var $message;
	var $host;
	var $cache;
	var $uid_cache;
	var $do_cache;
	var $exists;
	var $recent;
	var $rootdir;
	var $delimiter;
	var $capability = array();
}

class iilBasicHeader{
	var $id;
	var $uid;
	var $subject;
	var $from;
	var $to;
	var $cc;
	var $replyto;
	var $in_reply_to;
	var $date;
	var $messageID;
	var $size;
	var $encoding;
	var $ctype;
	var $flags;
	var $timestamp;
	var $f;
	var $seen;
	var $deleted;
	var $recent;
	var $answered;
	var $junk;
	var $internaldate;
	var $is_reply;
}


class iilThreadHeader{
	var $id;
	var $sbj;
	var $irt;
	var $mid;
}


function iil_xor($string, $string2){
    $result = "";
    $size = strlen($string);
    for ($i=0; $i<$size; $i++) $result .= chr(ord($string[$i]) ^ ord($string2[$i]));
        
    return $result;
}

function iil_ReadLine($fp, $size){
	$line="";
	if ($fp){
		do{
			$buffer = fgets($fp, 2048);
			if ($buffer === false)
				break;
			$line.=$buffer;
		}while($buffer[strlen($buffer)-1]!="\n");
	}
	return $line;
}

function iil_MultLine($fp, $line){
	$line = chop($line);
	if (ereg('\{[0-9]+\}$', $line)){
		$out = "";
		preg_match_all('/(.*)\{([0-9]+)\}$/', $line, $a);
		$bytes = $a[2][0];
		while(strlen($out)<$bytes){
			$out.=chop(iil_ReadLine($fp, 1024));
		}
		$line = $a[1][0]."\"$out\"";
	}
	return $line;
}

function iil_ReadBytes($fp, $bytes){
	$data = "";
	$len = 0;
	do{
		$data.=fread($fp, $bytes-$len);
		$len = strlen($data);
	}while($len<$bytes);
	return $data;
}

function iil_ReadReply($fp){
	do{
		$line = chop(trim(iil_ReadLine($fp, 1024)));
	}while($line[0]=="*");
	
	return $line;
}

function iil_ParseResult($string){
	$a=explode(" ", $string);
	if (count($a) > 2){
		if (strcasecmp($a[1], "OK")==0) return 0;
		else if (strcasecmp($a[1], "NO")==0) return -1;
		else if (strcasecmp($a[1], "BAD")==0) return -2;
	}else return -3;
}

// check if $string starts with $match
function iil_StartsWith($string, $match){
	$len = strlen($match);
	if ($len==0) return false;
	if (strncmp($string, $match, $len)==0) return true;
	else return false;
}

function iil_StartsWithI($string, $match){
	$len = strlen($match);
	if ($len==0) return false;
	if (strncasecmp($string, $match, $len)==0) return true;
	else return false;
}


function iil_C_Authenticate(&$conn, $user, $pass, $encChallenge){
    
    // initialize ipad, opad
    for ($i=0;$i<64;$i++){
        $ipad.=chr(0x36);
        $opad.=chr(0x5C);
    }
    // pad $pass so it's 64 bytes
    $padLen = 64 - strlen($pass);
    for ($i=0;$i<$padLen;$i++) $pass .= chr(0);
    // generate hash
    $hash = md5(iil_xor($pass,$opad).pack("H*",md5(iil_xor($pass, $ipad).base64_decode($encChallenge))));
    // generate reply
    $reply = base64_encode($user." ".$hash);
    
    // send result, get reply
    fputs($conn->fp, $reply."\r\n");
    $line = iil_ReadLine($conn->fp, 1024);
    
    // process result
    if (iil_ParseResult($line)==0){
        $conn->error .= "";
        $conn->errorNum = 0;
        return $conn->fp;
    }else{
        $conn->error .= 'Authentication for '.$user.' failed (AUTH): "'.htmlspecialchars($line)."\"";
        $conn->errorNum = -2;
        return false;
    }
}

function iil_C_Login(&$conn, $user, $password){

    $password = strtr($password, array('"'=>'\\"', '\\' => '\\\\'));  
    fputs($conn->fp, "a001 LOGIN $user \"$password\"\r\n");

  do{
    $line = iil_ReadReply($conn->fp);
    if ($line === false)
      break;
  }while(!iil_StartsWith($line, "a001 "));
    $a=explode(" ", $line);
    if (strcmp($a[1],"OK")==0){
        $result=$conn->fp;
        $conn->error.="";
        $conn->errorNum = 0;
    }else{
        $result=false;
        fclose($conn->fp);
        $conn->error .= 'Authentication for '.$user.' failed (LOGIN): "'.htmlspecialchars($line)."\"";
        $conn->errorNum = -2;
    }
    return $result;
}

function iil_ParseNamespace2($str, &$i, $len=0, $l){
	if (!$l) $str = str_replace("NIL", "()", $str);
	if (!$len) $len = strlen($str);
	$data = array();
	$in_quotes = false;
	$elem = 0;
	for($i;$i<$len;$i++){
		$c = (string)$str[$i];
		if ($c=='(' && !$in_quotes){
			$i++;
			$data[$elem] = iil_ParseNamespace2($str, $i, $len, $l++);
			$elem++;
		}else if ($c==')' && !$in_quotes) return $data;
		else if ($c=="\\"){
			$i++;
			if ($in_quotes) $data[$elem].=$c.$str[$i];
		}else if ($c=='"'){
			$in_quotes = !$in_quotes;
			if (!$in_quotes) $elem++;
		}else if ($in_quotes){
			$data[$elem].=$c;
		}
	}
	return $data;
}

function iil_C_NameSpace(&$conn){
	global $my_prefs;
	
	if (!in_array('NAMESPACE', $conn->capability))
	  return false;
	
	if ($my_prefs["rootdir"]) return true;
	
	fputs($conn->fp, "ns1 NAMESPACE\r\n");
	do{
		$line = iil_ReadLine($conn->fp, 1024);
		if (iil_StartsWith($line, "* NAMESPACE")){
			$i = 0;
			$data = iil_ParseNamespace2(substr($line,11), $i, 0, 0);
		}
	}while(!iil_StartsWith($line, "ns1"));
	
	if (!is_array($data)) return false;
	
	$user_space_data = $data[0];
	if (!is_array($user_space_data)) return false;
	
	$first_userspace = $user_space_data[0];
	if (count($first_userspace)!=2) return false;
	
	$conn->rootdir = $first_userspace[0];
	$conn->delimiter = $first_userspace[1];
	$my_prefs["rootdir"] = substr($conn->rootdir, 0, -1);
	
	return true;

}

function iil_Connect($host, $user, $password){	
    global $iil_error, $iil_errornum;
	global $ICL_SSL, $ICL_PORT;
	global $IMAP_NO_CACHE;
	global $my_prefs, $IMAP_USE_INTERNAL_DATE;
	
	$iil_error = "";
	$iil_errornum = 0;
	
	//strip slashes
	// $user = stripslashes($user);
	// $password = stripslashes($password);
	
	//set auth method
	$auth_method = "plain";
	if (func_num_args() >= 4){
		$auth_array = func_get_arg(3);
		if (is_array($auth_array)) $auth_method = $auth_array["imap"];
		if (empty($auth_method)) $auth_method = "plain";
	}
	$message = "INITIAL: $auth_method\n";
		
	$result = false;
	
	//initialize connection
	$conn = new iilConnection;
	$conn->error="";
	$conn->errorNum=0;
	$conn->selected="";
	$conn->user = $user;
	$conn->host = $host;
	$conn->cache = array();
	$conn->do_cache = (function_exists("cache_write")&&!$IMAP_NO_CACHE);
	$conn->cache_dirty = array();
	
	if ($my_prefs['sort_field']=='INTERNALDATE') $IMAP_USE_INTERNAL_DATE = true;
	else if ($my_prefs['sort_field']=='DATE') $IMAP_USE_INTERNAL_DATE = false;
	//echo '<!-- conn sort_field: '.$my_prefs['sort_field'].' //-->';
	
	//check input
	if (empty($host)) $iil_error .= "Invalid host\n";
	if (empty($user)) $iil_error .= "Invalid user\n";
	if (empty($password)) $iil_error .= "Invalid password\n";
	if (!empty($iil_error)) return false;
	if (!$ICL_PORT) $ICL_PORT = 143;
	
	//check for SSL
	if ($ICL_SSL){
		$host = "ssl://".$host;
	}
	
	//open socket connection
	$conn->fp = @fsockopen($host, $ICL_PORT, $errno, $errstr, 10);
	if (!$conn->fp){
        $iil_error = "Could not connect to $host at port $ICL_PORT: $errstr";
        $iil_errornum = -1;
		return false;
	}

	$iil_error.="Socket connection established\r\n";
	$line=iil_ReadLine($conn->fp, 300);

	if (strcasecmp($auth_method, "check")==0){
		//check for supported auth methods
		
		//default to plain text auth
		$auth_method = "plain";
			
		//check for CRAM-MD5
		fputs($conn->fp, "cp01 CAPABILITY\r\n");
		do{
		$line = trim(chop(iil_ReadLine($conn->fp, 100)));
		$conn->message.="$line\n";
			$a = explode(" ", $line);
			if ($line[0]=="*"){
				while ( list($k, $w) = each($a) ){
				    if ($w!='*' && $w!='CAPABILITY')
    					$conn->capability[] = $w;
					if ((strcasecmp($w, "AUTH=CRAM_MD5")==0)||
						(strcasecmp($w, "AUTH=CRAM-MD5")==0)){
							$auth_method = "auth";
						}
				}
			}
		}while($a[0]!="cp01");
	}

	if (strcasecmp($auth_method, "auth")==0){
		$conn->message.="Trying CRAM-MD5\n";
		//do CRAM-MD5 authentication
		fputs($conn->fp, "a000 AUTHENTICATE CRAM-MD5\r\n");
		$line = trim(chop(iil_ReadLine($conn->fp, 1024)));
		$conn->message.="$line\n";
		if ($line[0]=="+"){
			$conn->message.='Got challenge: '.htmlspecialchars($line)."\n";
			//got a challenge string, try CRAM-5
			$result = iil_C_Authenticate($conn, $user, $password, substr($line,2));
			$conn->message.= "Tried CRAM-MD5: $result \n";
		}else{
			$conn->message.='No challenge ('.htmlspecialchars($line)."), try plain\n";
			$auth = "plain";
		}
	}
		
	if ((!$result)||(strcasecmp($auth, "plain")==0)){
		//do plain text auth
		$result = iil_C_Login($conn, $user, $password);
		$conn->message.="Tried PLAIN: $result \n";
	}
		
	$conn->message .= $auth;
			
	if ($result){
		iil_C_Namespace($conn);
		return $conn;
	}else{
		$iil_error = $conn->error;
		$iil_errornum = $conn->errorNum;
		return false;
	}
}

function iil_Close(&$conn){
	iil_C_WriteCache($conn);
	if (@fputs($conn->fp, "I LOGOUT\r\n")){
		fgets($conn->fp, 1024);
		fclose($conn->fp);
		$conn->fp = false;
	}
}

function iil_ClearCache($user, $host){
}


function iil_C_WriteCache(&$conn){
	//echo "<!-- doing iil_C_WriteCache //-->\n";
	if (!$conn->do_cache) return false;
	
	if (is_array($conn->cache)){
		while(list($folder,$data)=each($conn->cache)){
			if ($folder && is_array($data) && $conn->cache_dirty[$folder]){
				$key = $folder.".imap";
				$result = cache_write($conn->user, $conn->host, $key, $data, true);
				//echo "<!-- writing $key $data: $result //-->\n";
			}
		}
	}
}

function iil_C_EnableCache(&$conn){
	$conn->do_cache = true;
}

function iil_C_DisableCache(&$conn){
	$conn->do_cache = false;
}

function iil_C_LoadCache(&$conn, $folder){
	if (!$conn->do_cache) return false;
	
	$key = $folder.".imap";
	if (!is_array($conn->cache[$folder])){
		$conn->cache[$folder] = cache_read($conn->user, $conn->host, $key);
		$conn->cache_dirty[$folder] = false;
	}
}

function iil_C_ExpireCachedItems(&$conn, $folder, $message_set){
	
	if (!$conn->do_cache) return;	//caching disabled
	if (!is_array($conn->cache[$folder])) return;	//cache not initialized|empty
	if (count($conn->cache[$folder])==0) return;	//cache not initialized|empty
		
	$uids = iil_C_FetchHeaderIndex($conn, $folder, $message_set, "UID");
	$num_removed = 0;
	if (is_array($uids)){
		//echo "<!-- unsetting: ".implode(",",$uids)." //-->\n";
		while(list($n,$uid)=each($uids)){
			unset($conn->cache[$folder][$uid]);
			//$conn->cache[$folder][$uid] = false;
			//$num_removed++;
		}
		$conn->cache_dirty[$folder] = true;

		//echo '<!--'."\n";
		//print_r($conn->cache);
		//echo "\n".'//-->'."\n";
	}else{
		echo "<!-- failed to get uids: $message_set //-->\n";
	}
	
	/*
	if ($num_removed>0){
		$new_cache;
		reset($conn->cache[$folder]);
		while(list($uid,$item)=each($conn->cache[$folder])){
			if ($item) $new_cache[$uid] = $conn->cache[$folder][$uid];
		}
		$conn->cache[$folder] = $new_cache;
	}
	*/
}

function iil_ExplodeQuotedString($delimiter, $string){
	$quotes=explode("\"", $string);
	while ( list($key, $val) = each($quotes))
		if (($key % 2) == 1) 
			$quotes[$key] = str_replace($delimiter, "_!@!_", $quotes[$key]);
	$string=implode("\"", $quotes);
	
	$result=explode($delimiter, $string);
	while ( list($key, $val) = each($result) )
		$result[$key] = str_replace("_!@!_", $delimiter, $result[$key]);
	
	return $result;
}

function iil_CheckForRecent($host, $user, $password, $mailbox){
	if (empty($mailbox)) $mailbox="INBOX";
	
	$conn=iil_Connect($host, $user, $password, "plain");
	$fp = $conn->fp;
	if ($fp){
		fputs($fp, "a002 EXAMINE \"$mailbox\"\r\n");
		do{
			$line=chop(iil_ReadLine($fp, 300));
			$a=explode(" ", $line);
			if (($a[0]=="*") && (strcasecmp($a[2], "RECENT")==0))  $result=(int)$a[1];
		}while (!iil_StartsWith($a[0],"a002"));

		fputs($fp, "a003 LOGOUT\r\n");
		fclose($fp);
	}else $result=-2;
	
	return $result;
}

function iil_C_Select(&$conn, $mailbox){
	$fp = $conn->fp;
	
	if (empty($mailbox)) return false;
	if (strcmp($conn->selected, $mailbox)==0) return true;
	
	iil_C_LoadCache($conn, $mailbox);
	
	if (fputs($fp, "sel1 SELECT \"$mailbox\"\r\n")){
		do{
			$line=chop(iil_ReadLine($fp, 300));
			$a=explode(" ", $line);
			if (count($a) == 3){
				if (strcasecmp($a[2], "EXISTS")==0) $conn->exists=(int)$a[1];
				if (strcasecmp($a[2], "RECENT")==0) $conn->recent=(int)$a[1];
			}
		}while (!iil_StartsWith($line, "sel1"));

		$a=explode(" ", $line);

		if (strcasecmp($a[1],"OK")==0){
			$conn->selected = $mailbox;
			return true;
		}else return false;
	}else{
		return false;
	}
}

function iil_C_CheckForRecent(&$conn, $mailbox){
	if (empty($mailbox)) $mailbox="INBOX";
	
	iil_C_Select($conn, $mailbox);
	if ($conn->selected==$mailbox) return $conn->recent;
	else return false;
}

function iil_C_CountMessages(&$conn, $mailbox, $refresh=false){
	if ($refresh) $conn->selected="";
	iil_C_Select($conn, $mailbox);
	if ($conn->selected==$mailbox) return $conn->exists;
	else return false;
}

function iil_SplitHeaderLine($string){
	$pos=strpos($string, ":");
	if ($pos>0){
		$res[0]=substr($string, 0, $pos);
		$res[1]=trim(substr($string, $pos+1));
		return $res;
	}else{
		return $string;
	}
}

function iil_StrToTime($str){
	global $IMAP_MONTHS,$IMAP_SERVER_TZ;
		
	if ($str) $time1 = strtotime($str);
	if ($time1 && $time1!=-1) return $time1-$IMAP_SERVER_TZ;
	
	//echo '<!--'.$str.'//-->';
	
	//replace double spaces with single space
	$str = trim($str);
	$str = str_replace("  ", " ", $str);
	
	//strip off day of week
	$pos=strpos($str, " ");
	if (!is_numeric(substr($str, 0, $pos))) $str = substr($str, $pos+1);

	//explode, take good parts
	$a=explode(" ",$str);
	//$month_a=array("Jan"=>1,"Feb"=>2,"Mar"=>3,"Apr"=>4,"May"=>5,"Jun"=>6,"Jul"=>7,"Aug"=>8,"Sep"=>9,"Oct"=>10,"Nov"=>11,"Dec"=>12);
	$month_str=$a[1];
	$month=$IMAP_MONTHS[$month_str];
	$day=(int)$a[0];
	$year=(int)$a[2];
	$time=$a[3];
	$tz_str = $a[4];
	$tz = substr($tz_str, 0, 3);
	$ta = explode(":",$time);
	$hour=(int)$ta[0]-(int)$tz;
	$minute=(int)$ta[1];
	$second=(int)$ta[2];
	
	//make UNIX timestamp
	$time2 = mktime($hour, $minute, $second, $month, $day, $year);
	//echo '<!--'.$time1.' '.$time2.' //-->'."\n";
	return $time2;
}

function iil_C_Sort(&$conn, $mailbox, $field, $add='', $is_uid=FALSE, $encoding='US-ASCII'){
	/*  Do "SELECT" command */
	if (!iil_C_Select($conn, $mailbox)) return false;
	
	$field = strtoupper($field);
	if ($field=='INTERNALDATE') $field='ARRIVAL';
	$fields = array('ARRIVAL'=>1,'CC'=>1,'DATE'=>1,'FROM'=>1,'SIZE'=>1,'SUBJECT'=>1,'TO'=>1);
	
	if (!$fields[$field])
	  return false;
	
	$is_uid = $is_uid ? 'UID ' : '';
	
	if (!empty($add))
	  $add = " $add";

	$fp = $conn->fp;
	$command = 's '. $is_uid .'SORT ('.$field.') '.$encoding.' ALL'."$add\r\n";
	$line = $data = '';
	
	if (!fputs($fp, $command)) return false;
	do{
		$line = chop(iil_ReadLine($fp, 1024));
		if (iil_StartsWith($line, '* SORT')) $data.=($data?' ':'').substr($line,7);
	}while($line[0]!='s');
	
	if (empty($data)){
		$conn->error = $line;
		return false;
	}
	
	$out = explode(' ',$data);
	return $out;
}

function iil_C_FetchHeaderIndex(&$conn, $mailbox, $message_set, $index_field, $normalize=true){
	global $IMAP_USE_INTERNAL_DATE;
	
	$c=0;
	$result=array();
	$fp = $conn->fp;
		
	if (empty($index_field)) $index_field="DATE";
	$index_field = strtoupper($index_field);
	
	list($from_idx, $to_idx) = explode(':', $message_set);
	if (empty($message_set) || (isset($to_idx) && (int)$from_idx > (int)$to_idx))
		return false;
	
	//$fields_a["DATE"] = ($IMAP_USE_INTERNAL_DATE?6:1);
	$fields_a['DATE'] = 1;
	$fields_a['INTERNALDATE'] = 6;
	$fields_a['FROM'] = 1;
	$fields_a['REPLY-TO'] = 1;
	$fields_a['SENDER'] = 1;
	$fields_a['TO'] = 1;
	$fields_a['SUBJECT'] = 1;
	$fields_a['UID'] = 2;
	$fields_a['SIZE'] = 2;
	$fields_a['SEEN'] = 3;
	$fields_a['RECENT'] = 4;
	$fields_a['DELETED'] = 5;
	
	$mode=$fields_a[$index_field];
	if (!($mode > 0)) return false;
	
	/*  Do "SELECT" command */
	if (!iil_C_Select($conn, $mailbox)) return false;
		
	/* FETCH date,from,subject headers */
	if ($mode==1){
		$key="fhi".($c++);
		$request=$key." FETCH $message_set (BODY.PEEK[HEADER.FIELDS ($index_field)])\r\n";
		if (!fputs($fp, $request)) return false;
		do{
			
			$line=chop(iil_ReadLine($fp, 200));
			$a=explode(" ", $line);
			if (($line[0]=="*") && ($a[2]=="FETCH") && ($line[strlen($line)-1]!=")")){
				$id=$a[1];

				$str=$line=chop(iil_ReadLine($fp, 300));

				while($line[0]!=")"){					//caution, this line works only in this particular case
					$line=chop(iil_ReadLine($fp, 300));
					if ($line[0]!=")"){
						if (ord($line[0]) <= 32){			//continuation from previous header line
							$str.=" ".trim($line);
						}
						if ((ord($line[0]) > 32) || (strlen($line[0]) == 0)){
							list($field, $string) = iil_SplitHeaderLine($str);
							if (strcasecmp($field, "date")==0){
								$result[$id]=iil_StrToTime($string);
							}else{
								$result[$id] = str_replace("\"", "", $string);
								if ($normalize) $result[$id]=strtoupper($result[$id]);
							}
							$str=$line;
						}
					}
				}
			}
			/*
			$end_pos = strlen($line)-1;
			if (($line[0]=="*") && ($a[2]=="FETCH") && ($line[$end_pos]=="}")){
				$id = $a[1];
				$pos = strrpos($line, "{")+1;
				$bytes = (int)substr($line, $pos, $end_pos-$pos);
				$received = 0;
				do{
					$line = iil_ReadLine($fp, 0);
					$received+=strlen($line);
					$line = chop($line);
					
					if ($received>$bytes) break;
					else if (!$line) continue;
					
					list($field,$string)=explode(": ", $line);
					
					if (strcasecmp($field, "date")==0)
						$result[$id] = iil_StrToTime($string);
					else if ($index_field!="DATE")
						$result[$id]=strtoupper(str_replace("\"", "", $string));
				}while($line[0]!=")");
			}else{
				//one line response, not expected so ignore				
			}
			*/
		}while(!iil_StartsWith($line, $key));
	}else if ($mode==6){
		$key="fhi".($c++);
		$request = $key." FETCH $message_set (INTERNALDATE)\r\n";
		if (!fputs($fp, $request)) return false;
		do{
			$line=chop(iil_ReadLine($fp, 200));
			if ($line[0]=="*"){
				//original: "* 10 FETCH (INTERNALDATE "31-Jul-2002 09:18:02 -0500")"
				$paren_pos = strpos($line, "(");
				$foo = substr($line, 0, $paren_pos);
				$a = explode(" ", $foo);
				$id = $a[1];
				
				$open_pos = strpos($line, "\"") + 1;
				$close_pos = strrpos($line, "\"");
				if ($open_pos && $close_pos){
					$len = $close_pos - $open_pos;
					$time_str = substr($line, $open_pos, $len);
					$result[$id] = strtotime($time_str);
				}
			}else{
				$a = explode(" ", $line);
			}
		}while(!iil_StartsWith($a[0], $key));
	}else{
		if ($mode >= 3) $field_name="FLAGS";
		else if ($index_field=="SIZE") $field_name="RFC822.SIZE";
		else $field_name=$index_field;

		/* 			FETCH uid, size, flags		*/
		$key="fhi".($c++);
		$request=$key." FETCH $message_set ($field_name)\r\n";

		if (!fputs($fp, $request)) return false;
		do{
			$line=chop(iil_ReadLine($fp, 200));
			$a = explode(" ", $line);
			if (($line[0]=="*") && ($a[2]=="FETCH")){
				$line=str_replace("(", "", $line);
				$line=str_replace(")", "", $line);
				$a=explode(" ", $line);
				
				$id=$a[1];

				if (isset($result[$id])) continue; //if we already got the data, skip forward
				if ($a[3]!=$field_name) continue;  //make sure it's returning what we requested
			
				/*  Caution, bad assumptions, next several lines */
				if ($mode==2) $result[$id]=$a[4];
				else{
					$haystack=strtoupper($line);
					$result[$id]=(strpos($haystack, $index_field) > 0 ? "F" : "N");
				}
			}
		}while(!iil_StartsWith($line, $key));
	}

	//check number of elements...
	list($start_mid,$end_mid)=explode(':',$message_set);
	if (is_numeric($start_mid) && is_numeric($end_mid)){
		//count how many we should have
		$should_have = $end_mid - $start_mid +1;
		
		//if we have less, try and fill in the "gaps"
		if (count($result)<$should_have){
			for($i=$start_mid;$i<=$end_mid;$i++) if (!isset($result[$i])) $result[$i] = '';
		}
	}
	
	return $result;	

}

function iil_CompressMessageSet($message_set){
	//given a comma delimited list of independent mid's, 
	//compresses by grouping sequences together
	
	//if less than 255 bytes long, let's not bother
	if (strlen($message_set)<255) return $message_set;
	
	//see if it's already been compress
	if (strpos($message_set,':')!==false) return $message_set;
	
	//separate, then sort
	$ids = explode(',',$message_set);
	sort($ids);
	
	$result = array();
	$start = $prev = $ids[0];
	foreach($ids as $id){
		$incr = $id - $prev;
		if ($incr>1){			//found a gap
			if ($start==$prev) $result[] = $prev;	//push single id
			else $result[] = $start.':'.$prev;		//push sequence as start_id:end_id
			$start = $id;							//start of new sequence
		}
		$prev = $id;
	}
	//handle the last sequence/id
	if ($start==$prev) $result[] = $prev;
	else $result[] = $start.':'.$prev;

	//return as comma separated string
	return implode(',',$result);
}

function iil_C_UIDsToMIDs(&$conn, $mailbox, $uids){
	if (!is_array($uids) || count($uids)==0) return array();
	return iil_C_Search($conn, $mailbox, "UID ".implode(",", $uids));
}

function iil_C_UIDToMID(&$conn, $mailbox, $uid){
	$result = iil_C_UIDsToMIDs($conn, $mailbox, array($uid));
	if (count($result)==1) return $result[0];
	else return false;
}

function iil_C_FetchUIDs(&$conn,$mailbox){
	global $clock;
	
	$num = iil_C_CountMessages($conn, $mailbox);
	if ($num==0) return array();
	$message_set = '1'.($num>1?':'.$num:'');
	
	//if cache not enabled, just call iil_C_FetchHeaderIndex on 'UID' field
	if (!$conn->do_cache)
		return iil_C_FetchHeaderIndex($conn, $mailbox, $message_set, 'UID');

	//otherwise, let's check cache first
	$key = $mailbox.'.uids';
	$cache_good = true;
	if ($conn->uid_cache) $data = $conn->uid_cache;
	else $data = cache_read($conn->user, $conn->host, $key);
	
	//was anything cached at all?
	if ($data===false) $cache_good = -1;
	
	//make sure number of messages were the same
	if ($cache_good>0 && $data['n']!=$num) $cache_good = -2;
	
	//if everything's okay so far...
	if ($cache_good>0){
		//check UIDs of highest mid with current and cached
		$temp = iil_C_Search($conn, $mailbox, 'UID '.$data['d'][$num]);
		if (!$temp || !is_array($temp) || $temp[0]!=$num) $cache_good=-3;
	}

	//if cached data's good, return it
	if ($cache_good>0){
		return $data['d'];
	}

	//otherwise, we need to fetch it
	$data = array('n'=>$num,'d'=>array());
	$data['d'] = iil_C_FetchHeaderIndex($conn, $mailbox, $message_set, 'UID');
	cache_write($conn->user, $conn->host, $key, $data);
	$conn->uid_cache = $data;
	return $data['d'];
}

function iil_SortThreadHeaders($headers, $index_a, $uids){
	asort($index_a);
	$result = array();
	foreach($index_a as $mid=>$foobar){
		$uid = $uids[$mid];
		$result[$uid] = $headers[$uid];
	}
	return $result;
}

function iil_C_FetchThreadHeaders(&$conn, $mailbox, $message_set){
	global $clock;
	global $index_a;
	
	list($from_idx, $to_idx) = explode(':', $message_set);
	if (empty($message_set) || (isset($to_idx) && (int)$from_idx > (int)$to_idx))
		return false;

	$result = array();
	$uids = iil_C_FetchUIDs($conn, $mailbox);
	$debug = false;
	
	/* Get cached records where possible */
	if ($conn->do_cache){
		$cached = cache_read($conn->user, $conn->host, $mailbox.'.thhd');
		if ($cached && is_array($uids) && count($uids)>0){
			$needed_set = "";
			foreach($uids as $id=>$uid){
				if ($cached[$uid]){
					$result[$uid] = $cached[$uid];
					$result[$uid]->id = $id;
				}else $needed_set.=($needed_set?",":"").$id;
			}
			if ($needed_set) $message_set = $needed_set;
			else $message_set = '';
		}
	}
	$message_set = iil_CompressMessageSet($message_set);
	if ($debug) echo "Still need: ".$message_set;
	
	/* if we're missing any, get them */
	if ($message_set){
		/* FETCH date,from,subject headers */
		$key="fh";
		$fp = $conn->fp;
		$request=$key." FETCH $message_set (BODY.PEEK[HEADER.FIELDS (SUBJECT MESSAGE-ID IN-REPLY-TO)])\r\n";
		$mid_to_id = array();
		if (!fputs($fp, $request)) return false;
		do{
			$line = chop(iil_ReadLine($fp, 1024));
			if ($debug) echo $line."\n";
			if (ereg('\{[0-9]+\}$', $line)){
				$a = explode(" ", $line);
				$new = array();

				$new_thhd = new iilThreadHeader;
				$new_thhd->id = $a[1];
				do{
					$line=chop(iil_ReadLine($fp, 1024),"\r\n");
					if (iil_StartsWithI($line,'Message-ID:') || (iil_StartsWithI($line,'In-Reply-To:')) || (iil_StartsWithI($line,'SUBJECT:'))){
						$pos = strpos($line, ":");
						$field_name = substr($line, 0, $pos);
						$field_val = substr($line, $pos+1);
						$new[strtoupper($field_name)] = trim($field_val);
					}else if (ereg('^[[:space:]]', $line)){
						$new[strtoupper($field_name)].= trim($line);
					}
				}while($line[0]!=')');
				$new_thhd->sbj = $new['SUBJECT'];
				$new_thhd->mid = substr($new['MESSAGE-ID'], 1, -1);
				$new_thhd->irt = substr($new['IN-REPLY-TO'], 1, -1);
				
				$result[$uids[$new_thhd->id]] = $new_thhd;
			}
		}while(!iil_StartsWith($line, "fh"));
	}
	
	/* sort headers */
	if (is_array($index_a)){
		$result = iil_SortThreadHeaders($result, $index_a, $uids);	
	}
	
	/* write new set to cache */
	if ($conn->do_cache){
		if (count($result)!=count($cached))
			cache_write($conn->user, $conn->host, $mailbox.'.thhd', $result);		
	}
	
	//echo 'iil_FetchThreadHeaders:'."\n";
	//print_r($result);
	
	return $result;
}

function iil_C_BuildThreads2(&$conn, $mailbox, $message_set, &$clock){
	global $index_a;

	list($from_idx, $to_idx) = explode(':', $message_set);
	if (empty($message_set) || (isset($to_idx) && (int)$from_idx > (int)$to_idx))
		return false;
	
	$result=array();
	$roots=array();
	$root_mids = array();
	$sub_mids = array();
	$strays = array();
	$messages = array();
	$fp = $conn->fp;
	$debug = false;
	
	$sbj_filter_pat = '[a-zA-Z]{2,3}(\[[0-9]*\])?:([[:space:]]*)';
	
	/*  Do "SELECT" command */
	if (!iil_C_Select($conn, $mailbox)) return false;

	/* FETCH date,from,subject headers */
	$mid_to_id = array();
	$messages = array();
	$headers = iil_C_FetchThreadHeaders($conn, $mailbox, $message_set);
	if ($clock) $clock->register('fetched headers');
	
	if ($debug) print_r($headers);
	
	/* go through header records */
	foreach($headers as $header){
		//$id = $header['i'];
		//$new = array('id'=>$id, 'MESSAGE-ID'=>$header['m'], 
		//			'IN-REPLY-TO'=>$header['r'], 'SUBJECT'=>$header['s']);
		$id = $header->id;
		$new = array('id'=>$id, 'MESSAGE-ID'=>$header->mid, 
					'IN-REPLY-TO'=>$header->irt, 'SUBJECT'=>$header->sbj);

		/* add to message-id -> mid lookup table */
		$mid_to_id[$new['MESSAGE-ID']] = $id;
		
		/* if no subject, use message-id */
		if (empty($new['SUBJECT'])) $new['SUBJECT'] = $new['MESSAGE-ID'];
		
		/* if subject contains 'RE:' or has in-reply-to header, it's a reply */
		$sbj_pre ='';
		$has_re = false;
		if (eregi($sbj_filter_pat, $new['SUBJECT'])) $has_re = true;
		if ($has_re||$new['IN-REPLY-TO']) $sbj_pre = 'RE:';
		
		/* strip out 're:', 'fw:' etc */
		if ($has_re) $sbj = ereg_replace($sbj_filter_pat,'', $new['SUBJECT']);
		else $sbj = $new['SUBJECT'];
		$new['SUBJECT'] = $sbj_pre.$sbj;
		
		
		/* if subject not a known thread-root, add to list */
		if ($debug) echo $id.' '.$new['SUBJECT']."\t".$new['MESSAGE-ID']."\n";
		$root_id = $roots[$sbj];
		
		if ($root_id && ($has_re || !$root_in_root[$root_id])){
			if ($debug) echo "\tfound root: $root_id\n";
			$sub_mids[$new['MESSAGE-ID']] = $root_id;
			$result[$root_id][] = $id;
		}else if (!isset($roots[$sbj])||(!$has_re&&$root_in_root[$root_id])){
			/* try to use In-Reply-To header to find root 
				unless subject contains 'Re:' */
			if ($has_re&&$new['IN-REPLY-TO']){
				if ($debug) echo "\tlooking: ".$new['IN-REPLY-TO']."\n";
				
				//reply to known message?
				$temp = $sub_mids[$new['IN-REPLY-TO']];
				
				if ($temp){
					//found it, root:=parent's root
					if ($debug) echo "\tfound parent: ".$new['SUBJECT']."\n";
					$result[$temp][] = $id;
					$sub_mids[$new['MESSAGE-ID']] = $temp;
					$sbj = '';
				}else{
					//if we can't find referenced parent, it's a "stray"
					$strays[$id] = $new['IN-REPLY-TO'];
				}
			}
			
			//add subject as root
			if ($sbj){
				if ($debug) echo "\t added to root\n";
				$roots[$sbj] = $id;
				$root_in_root[$id] = !$has_re;
				$sub_mids[$new['MESSAGE-ID']] = $id;
				$result[$id] = array($id);
			}
			if ($debug) echo $new['MESSAGE-ID']."\t".$sbj."\n";
		}
			
	}
	
	//now that we've gone through all the messages,
	//go back and try and link up the stray threads
	if (count($strays)>0){
		foreach($strays as $id=>$irt){
			$root_id = $sub_mids[$irt];
			if (!$root_id || $root_id==$id) continue;
			$result[$root_id] = array_merge($result[$root_id],$result[$id]);
			unset($result[$id]);
		}
	}
	
	if ($clock) $clock->register('data prepped');
	
	if ($debug) print_r($roots);
	//print_r($result);
	return $result;
}


function iil_SortThreads(&$tree, $index, $sort_order='ASC'){
	if (!is_array($tree) || !is_array($index)) return false;

	//create an id to position lookup table
	$i = 0;
	foreach($index as $id=>$val){
		$i++;
		$index[$id] = $i;
	}
	$max = $i+1;
	
	//for each tree, set array key to position
	$itree = array();
	foreach($tree as $id=>$node){
		if (count($tree[$id])<=1){
			//for "threads" with only one message, key is position of that message
			$n = $index[$id];
			$itree[$n] = array($n=>$id);
		}else{
			//for "threads" with multiple messages, 
			$min = $max;
			$new_a = array();
			foreach($tree[$id] as $mid){
				$new_a[$index[$mid]] = $mid;		//create new sub-array mapping position to id
				$pos = $index[$mid];
				if ($pos&&$pos<$min) $min = $index[$mid];	//find smallest position
			}
			$n = $min;	//smallest position of child is thread position
			
			//assign smallest position to root level key
			//set children array to one created above
			ksort($new_a);
			$itree[$n] = $new_a;
		}
	}
	
	
	//sort by key, this basically sorts all threads
	ksort($itree);
	$i=0;
	$out=array();
	foreach($itree as $k=>$node){
		$out[$i] = $itree[$k];
		$i++;
	}
	
	//return
	return $out;
}

function iil_IndexThreads(&$tree){
	/* creates array mapping mid to thread id */
	
	if (!is_array($tree)) return false;
	
	$t_index = array();
	foreach($tree as $pos=>$kids){
		foreach($kids as $kid) $t_index[$kid] = $pos;
	}
	
	return $t_index;
}

function iil_C_FetchHeaders(&$conn, $mailbox, $message_set, $uidfetch=false){
	global $IMAP_USE_INTERNAL_DATE;
	
	$c=0;
	$result=array();
	$fp = $conn->fp;
	
	list($from_idx, $to_idx) = explode(':', $message_set);
	if (empty($message_set) || (isset($to_idx) && (int)$from_idx > (int)$to_idx))
		return false;
		
	/*  Do "SELECT" command */
	if (!iil_C_Select($conn, $mailbox)){
		$conn->error = "Couldn't select $mailbox";
		return false;
	}
		
	/* Get cached records where possible */
	if ($conn->do_cache){
		$uids = iil_C_FetchHeaderIndex($conn, $mailbox, $message_set, "UID");
		if (is_array($uids) && count($conn->cache[$mailbox]>0)){
			$needed_set = "";
			while(list($id,$uid)=each($uids)){
				if ($conn->cache[$mailbox][$uid]){
					$result[$id] = $conn->cache[$mailbox][$uid];
					$result[$id]->id = $id;
				}else $needed_set.=($needed_set?",":"").$id;
			}
			//echo "<!-- iil_C_FetchHeader\nMessage Set: $message_set\nNeeded Set:$needed_set\n//-->\n";
			if ($needed_set) $message_set = iil_CompressMessageSet($needed_set);
			else return $result;
		}
	}

	/* FETCH date,from,subject headers */
	$key="fh".($c++);
	$prefix=$uidfetch?" UID":"";
	$request=$key.$prefix." FETCH $message_set (BODY.PEEK[HEADER.FIELDS (DATE FROM TO SUBJECT REPLY-TO IN-REPLY-TO CC BCC CONTENT-TRANSFER-ENCODING CONTENT-TYPE MESSAGE-ID REFERENCES)])\r\n";

	if (!fputs($fp, $request)) return false;
	do{
		$line=chop(iil_ReadLine($fp, 200));
		$a=explode(" ", $line);
		if (($line[0]=="*") && ($a[2]=="FETCH")){
			$id=$a[1];
			$result[$id]=new iilBasicHeader;
			$result[$id]->id = $id;
			$result[$id]->subject = "";
			/*
				Start parsing headers.  The problem is, some header "lines" take up multiple lines.
				So, we'll read ahead, and if the one we're reading now is a valid header, we'll
				process the previous line.  Otherwise, we'll keep adding the strings until we come
				to the next valid header line.
			*/
			$i = 0;
			$lines = array();
			do{
				$line = chop(iil_ReadLine($fp, 300),"\r\n");
				if (ord($line[0])<=32) $lines[$i].=(empty($lines[$i])?"":"\n").trim(chop($line));
				else{
					$i++;
					$lines[$i] = trim(chop($line));
				}
				/* 
					The preg_match below works around communigate imap, which outputs " UID <number>)".
					Without this, the while statement continues on and gets the "fh0 OK completed" message.
					If this loop gets the ending message, then the outer loop does not receive it from radline on line 1249.  
					This in causes the if statement on line 1278 to never be true, which causes the headers to end up missing
					If the if statement was changed to pick up the fh0 from this loop, then it causes the outer loop to spin
					An alternative might be:
					if (!preg_match("/:/",$line) && preg_match("/\)$/",$line)) break;
					however, unsure how well this would work with all imap clients.
				*/
				if (preg_match("/^\s*UID [0-9]+\)$/",$line)) break;
			}while(trim($line[0])!=")" && strncmp($line, $key, strlen($key)));  // patch from "Maksim Rubis" <siburny@hotmail.com>
			
            if(strncmp($line, $key, strlen($key)))
            { 
			//process header, fill iilBasicHeader obj.
			//	initialize
			if (is_array($headers)){
				reset($headers);
				while ( list($k, $bar) = each($headers) ) $headers[$k] = "";
			}

			//	create array with header field:data
			$headers = array();
			while ( list($lines_key, $str) = each($lines) ){
				list($field, $string) = iil_SplitHeaderLine($str);
				$field = strtolower($field);
				$headers[$field] = $string;
			}
			$result[$id]->date = $headers["date"];
			$result[$id]->timestamp = iil_StrToTime($headers["date"]);
			$result[$id]->from = $headers["from"];
			$result[$id]->to = str_replace("\n", " ", $headers["to"]);
			$result[$id]->subject = str_replace("\n", "", $headers["subject"]);
			$result[$id]->replyto = str_replace("\n", " ", $headers["reply-to"]);
			$result[$id]->cc = str_replace("\n", " ", $headers["cc"]);
			$result[$id]->bcc = str_replace("\n", " ", $headers["bcc"]);
			$result[$id]->encoding = str_replace("\n", " ", $headers["content-transfer-encoding"]);
			$result[$id]->ctype = str_replace("\n", " ", $headers["content-type"]);
			$result[$id]->in_reply_to = ereg_replace("[\n<>]",'', $headers['in-reply-to']);
			$result[$id]->references = $headers["references"];
			
			list($result[$id]->ctype, $ctype_add) = explode(";", $headers["content-type"]);

			if (preg_match('/charset="?([a-z0-9\-]+)"?/i', $ctype_add, $regs))
				$result[$id]->charset = $regs[1];

			$messageID = $headers["message-id"];
			if (!$messageID) "mid:".$id;
			$result[$id]->messageID = $messageID;
			}
            else {
            $a=explode(" ", $line);
            } 
			
		}
	}while(strcmp($a[0], $key)!=0);
		
	/* 
		FETCH uid, size, flags
		Sample reply line: "* 3 FETCH (UID 2417 RFC822.SIZE 2730 FLAGS (\Seen \Deleted))"
	*/
	$command_key="fh".($c++);
	$request= $command_key.$prefix." FETCH $message_set (UID RFC822.SIZE FLAGS INTERNALDATE)\r\n";
	if (!fputs($fp, $request)) return false;
	do{
		$line=chop(iil_ReadLine($fp, 200));
		//$a = explode(" ", $line);
		//if (($line[0]=="*") && ($a[2]=="FETCH")){
		if ($line[0]=="*"){
			//echo "<!-- $line //-->\n";
			//get outter most parens
			$open_pos = strpos($line, "(") + 1;
			$close_pos = strrpos($line, ")");
			if ($open_pos && $close_pos){
				//extract ID from pre-paren
				$pre_str = substr($line, 0, $open_pos);
				$pre_a = explode(" ", $line);
				$id = $pre_a[1];
				
				//get data
				$len = $close_pos - $open_pos;
				$str = substr($line, $open_pos, $len);
				
				//swap parents with quotes, then explode
				$str = eregi_replace("[()]", "\"", $str);
				$a = iil_ExplodeQuotedString(" ", $str);
				
				//did we get the right number of replies?
				$parts_count = count($a);
				if ($parts_count>=8){
					for ($i=0;$i<$parts_count;$i=$i+2){
						if (strcasecmp($a[$i],"UID")==0) $result[$id]->uid=$a[$i+1];
						else if (strcasecmp($a[$i],"RFC822.SIZE")==0) $result[$id]->size=$a[$i+1];
						else if (strcasecmp($a[$i],"INTERNALDATE")==0) $time_str = $a[$i+1];
						else if (strcasecmp($a[$i],"FLAGS")==0) $flags_str = $a[$i+1];
					}

					// process flags
					$flags_str = eregi_replace('[\\\"]', "", $flags_str);
					$flags_a = explode(" ", $flags_str);
					//echo "<!-- ID: $id FLAGS: ".implode(",", $flags_a)." //-->\n";
					
					$result[$id]->seen = false;
					$result[$id]->recent = false;
					$result[$id]->deleted = false;
					$result[$id]->answered = false;
					if (is_array($flags_a)){
						reset($flags_a);
						while (list($key,$val)=each($flags_a)){
							if (strcasecmp($val,"Seen")==0) $result[$id]->seen = true;
							else if (strcasecmp($val, "Deleted")==0) $result[$id]->deleted=true;
							else if (strcasecmp($val, "Recent")==0) $result[$id]->recent = true;
							else if (strcasecmp($val, "Answered")==0) $result[$id]->answered = true;
						}
						$result[$id]->flags=$flags_str;
					}
			
					// if time is gmt...	
					$time_str = str_replace('GMT','+0000',$time_str);
					
					//get timezone
					$time_str = substr($time_str, 0, -1);
					$time_zone_str = substr($time_str, -5); //extract timezone
					$time_str = substr($time_str, 1, -6); //remove quotes
					$time_zone = (float)substr($time_zone_str, 1, 2); //get first two digits
					if ($time_zone_str[3]!='0') $time_zone += 0.5;  //handle half hour offset
					if ($time_zone_str[0]=="-") $time_zone = $time_zone * -1.0; //minus?
					$result[$id]->internaldate = $time_str;
					
					if ($IMAP_USE_INTERNAL_DATE){
						//calculate timestamp
						$timestamp = strtotime($time_str); //return's server's time
						$na_timestamp = $timestamp;
						$timestamp -= $time_zone * 3600; //compensate for tz, get GMT
						$result[$id]->timestamp = $timestamp;
					}
						
					if ($conn->do_cache){
						$uid = $result[$id]->uid;
						$conn->cache[$mailbox][$uid] = $result[$id];
						$conn->cache_dirty[$mailbox] = true;
					}
					//echo "<!-- ID: $id : $time_str -- local: $na_timestamp (".date("F j, Y, g:i a", $na_timestamp).") tz: $time_zone -- GMT: ".$timestamp." (".date("F j, Y, g:i a", $timestamp).")  //-->\n";
				}else{
					//echo "<!-- ERROR: $id : $str //-->\n";
				}
			}
		}
	}while(strpos($line, $command_key)===false);
		
	return $result;
}


function iil_C_FetchHeader(&$conn, $mailbox, $id, $uidfetch=false){
	$fp = $conn->fp;
	$a=iil_C_FetchHeaders($conn, $mailbox, $id, $uidfetch);
	if (is_array($a)) return array_shift($a);
	else return false;
}


function iil_SortHeaders($a, $field, $flag){
	if (empty($field)) $field="uid";
	$field=strtolower($field);
	if ($field=="date"||$field=='internaldate') $field="timestamp";
	if (empty($flag)) $flag="ASC";
	$flag=strtoupper($flag);
	$stripArr = ($field=='subject') ? array('Re: ','Fwd: ','Fw: ',"\"") : array("\"");

	$c=count($a);
	if ($c>0){
		/*
			Strategy:
			First, we'll create an "index" array.
			Then, we'll use sort() on that array, 
			and use that to sort the main array.
		*/
                
		// create "index" array
		$index=array();
		reset($a);
		while (list($key, $val)=each($a)){

			if ($field=="timestamp"){
				$data = @strtotime($val->date);
				if ($data == false)
					$data = $val->timestamp;
				}
			else {
				$data = $val->$field;
				if (is_string($data))
					$data=strtoupper(str_replace($stripArr, "", $data));
				}

			$index[$key]=$data;
		}
		
		// sort index
		$i=0;
		if ($flag=="ASC") asort($index);
		else arsort($index);
		
		// form new array based on index 
		$result=array();
		reset($index);
		while (list($key, $val)=each($index)){
			$result[$key]=$a[$key];
			$i++;
		}
	}
	
	return $result;
}

function iil_C_Expunge(&$conn, $mailbox){
	$fp = $conn->fp;
	if (iil_C_Select($conn, $mailbox)){
		$c=0;
		fputs($fp, "exp1 EXPUNGE\r\n");
		do{
			$line=chop(iil_ReadLine($fp, 100));
			if ($line[0]=="*") $c++;
		}while (!iil_StartsWith($line, "exp1"));
		
		if (iil_ParseResult($line) == 0){
			$conn->selected = ""; //state has changed, need to reselect			
			//$conn->exists-=$c;
			return $c;
		}else{
			$conn->error = $line;
			return -1;
		}
	}
	
	return -1;
}

function iil_C_ModFlag(&$conn, $mailbox, $messages, $flag, $mod){
	if ($mod!="+" && $mod!="-") return -1;
	
	$fp = $conn->fp;
	$flags=array(
                    "SEEN"=>"\\Seen",
                    "DELETED"=>"\\Deleted",
                    "RECENT"=>"\\Recent",
                    "ANSWERED"=>"\\Answered",
                    "DRAFT"=>"\\Draft",
					"FLAGGED"=>"\\Flagged"
                   );
	$flag=strtoupper($flag);
	$flag=$flags[$flag];
	if (iil_C_Select($conn, $mailbox)){
		$c=0;
		fputs($fp, "flg STORE $messages ".$mod."FLAGS (".$flag.")\r\n");
		do{
			$line=chop(iil_ReadLine($fp, 100));
			if ($line[0]=="*") $c++;
		}while (!iil_StartsWith($line, "flg"));

		if (iil_ParseResult($line) == 0){
			iil_C_ExpireCachedItems($conn, $mailbox, $messages);
			return $c;
		}else{
			$conn->error = $line;
			return -1;
		}
	}else{
		$conn->error = "Select failed";
		return -1;
	}
}

function iil_C_Flag(&$conn, $mailbox, $messages, $flag){
	return iil_C_ModFlag($conn, $mailbox, $messages, $flag, "+");
}

function iil_C_Unflag(&$conn, $mailbox, $messages, $flag){
	return iil_C_ModFlag($conn, $mailbox, $messages, $flag, "-");
}

function iil_C_Delete(&$conn, $mailbox, $messages){
	return iil_C_ModFlag($conn, $mailbox, $messages, "DELETED", "+");
}

function iil_C_Undelete(&$conn, $mailbox, $messages){
	return iil_C_ModFlag($conn, $mailbox, $messages, "DELETED", "-");
}


function iil_C_Unseen(&$conn, $mailbox, $messages){
	return iil_C_ModFlag($conn, $mailbox, $messages, "SEEN", "-");
}


function iil_C_Copy(&$conn, $messages, $from, $to){
	$fp = $conn->fp;

	if (empty($from) || empty($to)) return -1;

	if (iil_C_Select($conn, $from)){
		$c=0;
		
		fputs($fp, "cpy1 COPY $messages \"$to\"\r\n");
		$line=iil_ReadReply($fp);
		return iil_ParseResult($line);
	}else{
		return -1;
	}
}

function iil_FormatSearchDate($month, $day, $year){
	$month = (int)$month;
	$months=array(
			1=>"Jan", 2=>"Feb", 3=>"Mar", 4=>"Apr", 
			5=>"May", 6=>"Jun", 7=>"Jul", 8=>"Aug", 
			9=>"Sep", 10=>"Oct", 11=>"Nov", 12=>"Dec"
			);
	return $day."-".$months[$month]."-".$year;
}

function iil_C_CountUnseen(&$conn, $folder){
	$index = iil_C_Search($conn, $folder, "ALL UNSEEN");
	if (is_array($index)){
		$str = implode(",", $index);
		if (empty($str)) return false;
		else return count($index);
	}else return false;
}

function iil_C_UID2ID(&$conn, $folder, $uid){
	if ($uid > 0){
		$id_a = iil_C_Search($conn, $folder, "UID $uid");
		if (is_array($id_a)){
			$count = count($id_a);
			if ($count > 1) return false;
			else return $id_a[0];
		}
	}
	return false;
}

function iil_C_ID2UID(&$conn, $folder, $id){
	$fp = $conn->fp;
	$result=-1;
	if ($id > 0) {
		if (iil_C_Select($conn, $folder)){
			$key = "FUID";
			if (fputs($fp, "$key FETCH $id (UID)\r\n")){
				do{
					$line=chop(iil_ReadLine($fp, 1024));
					if (eregi("^\* $id FETCH \(UID (.*)\)", $line, $r)){
						$result = $r[1];
					}
				} while (!preg_match("/^$key/", $line));
			}
		}
	}
	return $result;
}

function iil_C_Search(&$conn, $folder, $criteria){
	$fp = $conn->fp;
	if (iil_C_Select($conn, $folder)){
		$c=0;
		
		$query = "srch1 SEARCH ".chop($criteria)."\r\n";
		fputs($fp, $query);
		do{
			$line=trim(chop(iil_ReadLine($fp, 10000)));
			if (eregi("^\* SEARCH", $line)){
				$str = trim(substr($line, 8));
				$messages = explode(" ", $str);
			}
		}while(!iil_StartsWith($line, "srch1"));
		
		$result_code=iil_ParseResult($line);
		if ($result_code==0) return $messages;
		else{
			$conn->error = "iil_C_Search: ".$line."\n";
			return false;
		}
		
	}else{
		$conn->error = "iil_C_Search: Couldn't select \"$folder\"\n";
		return false;
	}
}

function iil_C_Move(&$conn, $messages, $from, $to){
	$fp = $conn->fp;
	
	if (!$from || !$to) return -1;
	
	$r=iil_C_Copy($conn, $messages, $from,$to);
	if ($r==0){
		return iil_C_Delete($conn, $from, $messages);
	}else{
		return $r;
	}
}

function iil_C_GetHierarchyDelimiter(&$conn){
	if ($conn->delimiter) return $conn->delimiter;
	
	$fp = $conn->fp;
	$delimiter = false;
	
	//try (LIST "" ""), should return delimiter (RFC2060 Sec 6.3.8)
	if (!fputs($fp, "ghd LIST \"\" \"\"\r\n")) return false;
	do{
		$line=iil_ReadLine($fp, 500);
		if ($line[0]=="*"){
			$line = rtrim($line);
			$a=iil_ExplodeQuotedString(" ", $line);
			if ($a[0]=="*") $delimiter = str_replace("\"", "", $a[count($a)-2]);
		}
	}while (!iil_StartsWith($line, "ghd"));

	if (strlen($delimiter)>0) return $delimiter;
	
	//if that fails, try namespace extension
	//try to fetch namespace data
	fputs($conn->fp, "ns1 NAMESPACE\r\n");
	do{
		$line = iil_ReadLine($conn->fp, 1024);
		if (iil_StartsWith($line, "* NAMESPACE")){
			$i = 0;
			$data = iil_ParseNamespace2(substr($line,11), $i, 0, 0);
		}
	}while(!iil_StartsWith($line, "ns1"));
		
	if (!is_array($data)) return false;
	
	//extract user space data (opposed to global/shared space)
	$user_space_data = $data[0];
	if (!is_array($user_space_data)) return false;
	
	//get first element
	$first_userspace = $user_space_data[0];
	if (!is_array($first_userspace)) return false;

	//extract delimiter
	$delimiter = $first_userspace[1];	

	return $delimiter;
}

function iil_C_ListMailboxes(&$conn, $ref, $mailbox){
	global $IGNORE_FOLDERS;
	
	$ignore = $IGNORE_FOLDERS[strtolower($conn->host)];
		
	$fp = $conn->fp;
	if (empty($mailbox)) $mailbox="*";
	if (empty($ref) && $conn->rootdir) $ref = $conn->rootdir;
	
    // send command
	if (!fputs($fp, "lmb LIST \"".$ref."\" \"$mailbox\"\r\n")) return false;
	$i=0;
    // get folder list
	do{
		$line=iil_ReadLine($fp, 500);
		$line=iil_MultLine($fp, $line);

		$a = explode(" ", $line);
		if (($line[0]=="*") && ($a[1]=="LIST")){
			$line = rtrim($line);
            // split one line
			$a=iil_ExplodeQuotedString(" ", $line);
            // last string is folder name
			$folder = str_replace("\"", "", $a[count($a)-1]);
            if (empty($ignore) || (!empty($ignore) && !eregi($ignore, $folder))) $folders[$i] = $folder;
            // second from last is delimiter
            $delim = str_replace("\"", "", $a[count($a)-2]);
            // is it a container?
            $i++;
		}
	}while (!iil_StartsWith($line, "lmb"));

	if (is_array($folders)){
        if (!empty($ref)){
            // if rootdir was specified, make sure it's the first element
            // some IMAP servers (i.e. Courier) won't return it
            if ($ref[strlen($ref)-1]==$delim) $ref = substr($ref, 0, strlen($ref)-1);
            if ($folders[0]!=$ref) array_unshift($folders, $ref);
        }
        return $folders;
	}else if (iil_ParseResult($line)==0){
		return array('INBOX');
	}else{
		$conn->error = $line;
		return false;
	}
}


function iil_C_ListSubscribed(&$conn, $ref, $mailbox){
	global $IGNORE_FOLDERS;
	
	$ignore = $IGNORE_FOLDERS[strtolower($conn->host)];
	
	$fp = $conn->fp;
	if (empty($mailbox)) $mailbox = "*";
	if (empty($ref) && $conn->rootdir) $ref = $conn->rootdir;
	$folders = array();

    // send command
	if (!fputs($fp, "lsb LSUB \"".$ref."\" \"".$mailbox."\"\r\n")){
		$conn->error = "Couldn't send LSUB command\n";
		return false;
	}
	$i=0;
    // get folder list
	do{
		$line=iil_ReadLine($fp, 500);
		$line=iil_MultLine($fp, $line);
		$a = explode(" ", $line);
		if (($line[0]=="*") && ($a[1]=="LSUB" || $a[1]=="LIST")){
			$line = rtrim($line);
            // split one line
			$a=iil_ExplodeQuotedString(" ", $line);
            // last string is folder name
            //$folder = UTF7DecodeString(str_replace("\"", "", $a[count($a)-1]));
            $folder = str_replace("\"", "", $a[count($a)-1]);
			if ((!in_array($folder, $folders)) && (empty($ignore) || (!empty($ignore) && !eregi($ignore, $folder)))) $folders[$i] = $folder;
            // second from last is delimiter
            $delim = str_replace("\"", "", $a[count($a)-2]);
            // is it a container?
            $i++;
		}
	}while (!iil_StartsWith($line, "lsb"));

	if (is_array($folders)){
        if (!empty($ref)){
            // if rootdir was specified, make sure it's the first element
            // some IMAP servers (i.e. Courier) won't return it
            if ($ref[strlen($ref)-1]==$delim) $ref = substr($ref, 0, strlen($ref)-1);
            if ($folders[0]!=$ref) array_unshift($folders, $ref);
        }
        return $folders;
	}else{
		$conn->error = $line;
		return false;
	}
}


function iil_C_Subscribe(&$conn, $folder){
	$fp = $conn->fp;

	$query = "sub1 SUBSCRIBE \"".$folder."\"\r\n";
	fputs($fp, $query);
	$line=trim(chop(iil_ReadLine($fp, 10000)));
	return iil_ParseResult($line);
}


function iil_C_UnSubscribe(&$conn, $folder){
	$fp = $conn->fp;

	$query = "usub1 UNSUBSCRIBE \"".$folder."\"\r\n";
	fputs($fp, $query);
	$line=trim(chop(iil_ReadLine($fp, 10000)));
	return iil_ParseResult($line);
}


function iil_C_FetchPartHeader(&$conn, $mailbox, $id, $part){
	$fp = $conn->fp;
	$result=false;
	if (($part==0)||(empty($part))) $part="HEADER";
	else $part.=".MIME";
	
	if (iil_C_Select($conn, $mailbox)){
		$key="fh".($c++);
		$request=$key." FETCH $id (BODY.PEEK[$part])\r\n";
		if (!fputs($fp, $request)) return false;
		do{
			$line=chop(iil_ReadLine($fp, 200));
			$a=explode(" ", $line);
			if (($line[0]=="*") && ($a[2]=="FETCH") && ($line[strlen($line)-1]!=")")){
				$line=iil_ReadLine($fp, 300);
				while(chop($line)!=")"){
					$result.=$line;
					$line=iil_ReadLine($fp, 300);
				}
			}
		}while(strcmp($a[0], $key)!=0);
	}
	
	return $result;
}


function iil_C_HandlePartBody(&$conn, $mailbox, $id, $part, $mode){
    /* modes:
        1: return string
        2: print
        3: base64 and print
    */
	$fp = $conn->fp;
	$result=false;
	if (($part==0)||(empty($part))) $part="TEXT";
	
	if (iil_C_Select($conn, $mailbox)){
        $reply_key="* ".$id;
        // format request
		$key="ftch".($c++)." ";
		$request=$key."FETCH $id (BODY.PEEK[$part])\r\n";
        // send request
		if (!fputs($fp, $request)) return false;
        // receive reply line
        do{
            $line = chop(iil_ReadLine($fp, 1000));
            $a = explode(" ", $line);
        }while ($a[2]!="FETCH");
        $len = strlen($line);
        if ($line[$len-1] == ")"){
            //one line response, get everything between first and last quotes
            $from = strpos($line, "\"") + 1;
            $to = strrpos($line, "\"");
            $len = $to - $from;
            if ($mode==1) $result = substr($line, $from, $len);
            else if ($mode==2) echo substr($line, $from, $len);
            else if ($mode==3) echo base64_decode(substr($line, $from, $len));
        }else if ($line[$len-1] == "}"){
            //multi-line request, find sizes of content and receive that many bytes
            $from = strpos($line, "{") + 1;
            $to = strrpos($line, "}");
            $len = $to - $from;
            $sizeStr = substr($line, $from, $len);
            $bytes = (int)$sizeStr;
            $received = 0;
            while ($received < $bytes){
                $remaining = $bytes - $received;
                $line = iil_ReadLine($fp, 1024);
                $len = strlen($line);
                if ($len > $remaining) $line = substr($line, 0, $remaining);
                $received += strlen($line);
                if ($mode==1) $result .= chop($line)."\n";
                else if ($mode==2){ echo chop($line)."\n"; flush(); }
                else if ($mode==3){ echo base64_decode($line); flush(); }
            }
        }
        // read in anything up until 'til last line
		do{
            $line = iil_ReadLine($fp, 1024);
		}while(!iil_StartsWith($line, $key));
        
        if ($result){
			$result = chop($result);
            return $result; // substr($result, 0, strlen($result)-1);
        }else return false;
	}else{
		echo "Select failed.";
	}
    
    if ($mode==1) return $result;
    else return $received;
}

function iil_C_FetchPartBody(&$conn, $mailbox, $id, $part){
    return iil_C_HandlePartBody($conn, $mailbox, $id, $part, 1);
}

function iil_C_PrintPartBody(&$conn, $mailbox, $id, $part){
    iil_C_HandlePartBody($conn, $mailbox, $id, $part, 2);
}

function iil_C_PrintBase64Body(&$conn, $mailbox, $id, $part){
    iil_C_HandlePartBody($conn, $mailbox, $id, $part, 3);
}

function iil_C_CreateFolder(&$conn, $folder){
	$fp = $conn->fp;
	if (fputs($fp, "c CREATE \"".$folder."\"\r\n")){
		do{
			$line=iil_ReadLine($fp, 300);
		}while($line[0]!="c");
        $conn->error = $line;
		return (iil_ParseResult($line)==0);
	}else{
		return false;
	}
}

function iil_C_RenameFolder(&$conn, $from, $to){
	$fp = $conn->fp;
	if (fputs($fp, "r RENAME \"".$from."\" \"".$to."\"\r\n")){
		do{
			$line=iil_ReadLine($fp, 300);
		}while($line[0]!="r");
		return (iil_ParseResult($line)==0);
	}else{
		return false;
	}	
}

function iil_C_DeleteFolder(&$conn, $folder){
	$fp = $conn->fp;
	if (fputs($fp, "d DELETE \"".$folder."\"\r\n")){
		do{
			$line=iil_ReadLine($fp, 300);
		}while($line[0]!="d");
		return (iil_ParseResult($line)==0);
	}else{
		$conn->error = "Couldn't send command\n";
		return false;
	}
}

function iil_C_Append(&$conn, $folder, &$message){
	if (!$folder) return false;
	$fp = $conn->fp;

	$message = str_replace("\r", "", $message);
	$message = str_replace("\n", "\r\n", $message);		

	$len = strlen($message);
	if (!$len) return false;
	
	$request="A APPEND \"".$folder."\" (\\Seen) {".$len."}\r\n";
	if (fputs($fp, $request)){
		$line=iil_ReadLine($fp, 100);		
		$sent = fwrite($fp, $message."\r\n");
		flush();
		do{
			$line=iil_ReadLine($fp, 1000);
		}while($line[0]!="A");
	
		$result = (iil_ParseResult($line)==0);
		if (!$result) $conn->error .= $line."\n";
		return $result;
	
	}else{
		$conn->error .= "Couldn't send command \"$request\"\n";
		return false;
	}
}


function iil_C_AppendFromFile(&$conn, $folder, $path){
	if (!$folder) return false;
	
	//open message file
	$in_fp = false;				
	if (file_exists(realpath($path))) $in_fp = fopen($path, "r");
	if (!$in_fp){ 
		$conn->error .= "Couldn't open $path for reading\n";
		return false;
	}
	
	$fp = $conn->fp;
	$len = filesize($path);
	if (!$len) return false;
	
	//send APPEND command
	$request="A APPEND \"".$folder."\" (\\Seen) {".$len."}\r\n";
	$bytes_sent = 0;
	if (fputs($fp, $request)){
		$line=iil_ReadLine($fp, 100);
				
		//send file
		while(!feof($in_fp)){
			$buffer = fgets($in_fp, 4096);
			$bytes_sent += strlen($buffer);
			fputs($fp, $buffer);
		}
		fclose($in_fp);

		fputs($fp, "\r\n");

		//read response
		do{
			$line=iil_ReadLine($fp, 1000);
		}while($line[0]!="A");
			
		$result = (iil_ParseResult($line)==0);
		if (!$result) $conn->error .= $line."\n";
		return $result;
	
	}else{
		$conn->error .= "Couldn't send command \"$request\"\n";
		return false;
	}
}


function iil_C_FetchStructureString(&$conn, $folder, $id){
	$fp = $conn->fp;
	$result=false;
	if (iil_C_Select($conn, $folder)){
		$key = "F1247";
		if (fputs($fp, "$key FETCH $id (BODYSTRUCTURE)\r\n")){
			do{
				$line=chop(iil_ReadLine($fp, 5000));
				if ($line[0]=="*"){
					if (ereg("\}$", $line)){
						preg_match('/(.+)\{([0-9]+)\}/', $line, $match);  
						$result = $match[1];
						do{
							$line = chop(iil_ReadLine($fp, 100));
							if (!preg_match("/^$key/", $line)) $result .= $line;
							else $done = true;
						}while(!$done);
					}else{
						$result = $line;
					}
					list($pre, $post) = explode("BODYSTRUCTURE ", $result);
					$result = substr($post, 0, strlen($post)-1);		//truncate last ')' and return
				}
			}while (!preg_match("/^$key/",$line));
		}
	}
	return $result;
}

function iil_C_PrintSource(&$conn, $folder, $id, $part){
	$header = iil_C_FetchPartHeader($conn, $folder, $id, $part);
	//echo str_replace("\r", "", $header);
	echo $header;
	echo iil_C_PrintPartBody($conn, $folder, $id, $part);
}

function iil_C_GetQuota(&$conn){
/*
b GETQUOTAROOT "INBOX"
* QUOTAROOT INBOX user/rchijiiwa1
* QUOTA user/rchijiiwa1 (STORAGE 654 9765)
b OK Completed
*/
	$fp = $conn->fp;
	$result=false;
	$quota_line = "";
	
	//get line containing quota info
	if (fputs($fp, "QUOT1 GETQUOTAROOT \"INBOX\"\r\n")){
		do{
			$line=chop(iil_ReadLine($fp, 5000));
			if (iil_StartsWith($line, "* QUOTA ")) $quota_line = $line;
		}while(!iil_StartsWith($line, "QUOT1"));
	}
	
	//return false if not found, parse if found
	if (!empty($quota_line)){
		$quota_line = eregi_replace("[()]", "", $quota_line);
		$parts = explode(" ", $quota_line);
		$storage_part = array_search("STORAGE", $parts);
		if ($storage_part>0){
			$result = array();
			$used = $parts[$storage_part+1];
			$total = $parts[$storage_part+2];
			$result["used"] = $used;
			$result["total"] = (empty($total)?"??":$total);
			$result["percent"] = (empty($total)?"??":round(($used/$total)*100));
			$result["free"] = 100 - $result["percent"];
		}
	}
	
	return $result;
}


function iil_C_ClearFolder(&$conn, $folder){
	$num_in_trash = iil_C_CountMessages($conn, $folder);
	if ($num_in_trash > 0) iil_C_Delete($conn, $folder, "1:".$num_in_trash);
	return (iil_C_Expunge($conn, $folder) >= 0);
}

?>