| Path : /opt/z-push/lib/wbxml/ |
|
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| Current File : //opt/z-push/lib/wbxml/wbxmldecoder.php |
<?php
/***********************************************
* File : wbxmldecoder.php
* Project : Z-Push
* Descr : WBXMLDecoder decodes from Wap Binary XML
*
* Created : 01.10.2007
*
* Copyright 2007 - 2016 Zarafa Deutschland GmbH
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Consult LICENSE file for details
************************************************/
class WBXMLDecoder extends WBXMLDefs {
private $in;
private $inLog;
private $tagcp = 0;
private $ungetbuffer;
private $log = false;
private $logStack = array();
private $inputBuffer = "";
private $isWBXML = true;
static private $loopCounter = array();
const MAXLOOP = 5000;
const VERSION = 0x03;
/**
* Counts the amount of times a code part has been executed.
* When being executed too often, the code throws a WBMXLException.
*
* @access public
* @param String $name
* @throws WBXMLException
* @return boolean
*/
static public function InWhile($name) {
if (!isset(self::$loopCounter[$name])) {
self::$loopCounter[$name] = 0;
}
else {
self::$loopCounter[$name]++;
}
if (self::$loopCounter[$name] > self::MAXLOOP) {
throw new WBXMLException(sprintf("Loop count in while too high, code '%s' exceeded max. amount of permitted loops", $name));
}
return true;
}
/**
* Resets the inWhile counter.
*
* @param String $name
* @return boolean
*/
static public function ResetInWhile($name) {
if (isset(self::$loopCounter[$name])) {
unset(self::$loopCounter[$name]);
}
return true;
}
/**
* WBXML Decode Constructor
* We only handle ActiveSync WBXML, which is a subset of WBXML
*
* @param stream $input the incoming data stream
*
* @access public
*/
public function __construct($input) {
$this->log = ZLog::IsWbxmlDebugEnabled();
$this->in = $input;
$version = $this->getByte();
if($version != self::VERSION) {
$this->inputBuffer .= chr($version);
$this->isWBXML = false;
return;
}
$publicid = $this->getMBUInt();
if($publicid !== 1)
throw new WBXMLException("Wrong publicid : ".$publicid);
$charsetid = $this->getMBUInt();
if ($charsetid !== 106)
throw new WBXMLException("Wrong charset : ".$charsetid);
$stringtablesize = $this->getMBUInt();
if ($stringtablesize !== 0)
throw new WBXMLException("Wrong string table size : ".$stringtablesize);
}
/**
* Returns either start, content or end, and auto-concatenates successive content
*
* @access public
* @return element/value
*/
public function getElement() {
$element = $this->getToken();
switch($element[EN_TYPE]) {
case EN_TYPE_STARTTAG:
return $element;
case EN_TYPE_ENDTAG:
return $element;
case EN_TYPE_CONTENT:
WBXMLDecoder::ResetInWhile("decoderGetElement");
while(WBXMLDecoder::InWhile("decoderGetElement")) {
$next = $this->getToken();
if($next == false)
return false;
else if($next[EN_TYPE] == EN_CONTENT) {
$element[EN_CONTENT] .= $next[EN_CONTENT];
} else {
$this->ungetElement($next);
break;
}
}
return $element;
}
return false;
}
/**
* Get a peek at the next element
*
* @access public
* @return element
*/
public function peek() {
$element = $this->getElement();
$this->ungetElement($element);
return $element;
}
/**
* Get the element of a StartTag
*
* @param $tag
*
* @access public
* @return element/boolean returns false if not available
*/
public function getElementStartTag($tag) {
$element = $this->getToken();
if($element[EN_TYPE] == EN_TYPE_STARTTAG && $element[EN_TAG] == $tag)
return $element;
else {
ZLog::Write(LOGLEVEL_WBXMLSTACK, sprintf("WBXMLDecoder->getElementStartTag(): unmatched WBXML tag: '%s' matching '%s' type '%s' flags '%s'", $tag, ((isset($element[EN_TAG]))?$element[EN_TAG]:""), ((isset($element[EN_TYPE]))?$element[EN_TYPE]:""), ((isset($element[EN_FLAGS]))?$element[EN_FLAGS]:"")));
$this->ungetElement($element);
}
return false;
}
/**
* Get the element of a EndTag
*
* @access public
* @return element/boolean returns false if not available
*/
public function getElementEndTag() {
$element = $this->getToken();
if($element[EN_TYPE] == EN_TYPE_ENDTAG)
return $element;
else {
ZLog::Write(LOGLEVEL_WBXMLSTACK, sprintf("WBXMLDecoder->getElementEndTag(): unmatched WBXML tag: '%s' type '%s' flags '%s'", ((isset($element[EN_TAG]))?$element[EN_TAG]:""), ((isset($element[EN_TYPE]))?$element[EN_TYPE]:""), ((isset($element[EN_FLAGS]))?$element[EN_FLAGS]:"")));
$bt = debug_backtrace();
ZLog::Write(LOGLEVEL_ERROR, sprintf("WBXMLDecoder->getElementEndTag(): could not read end tag in '%s'. Please enable the LOGLEVEL_WBXML and send the log to the Z-Push dev team.", $bt[0]["file"] . ":" . $bt[0]["line"]));
// log the remaining wbxml content
$this->ungetElement($element);
while($el = $this->getElement());
}
return false;
}
/**
* Get the content of an element
*
* @access public
* @return string/boolean returns false if not available
*/
public function getElementContent() {
$element = $this->getToken();
if($element[EN_TYPE] == EN_TYPE_CONTENT) {
return $element[EN_CONTENT];
}
else {
ZLog::Write(LOGLEVEL_WBXMLSTACK, sprintf("WBXMLDecoder->getElementContent(): unmatched WBXML content: '%s' type '%s' flags '%s'", ((isset($element[EN_TAG]))?$element[EN_TAG]:""), ((isset($element[EN_TYPE]))?$element[EN_TYPE]:""), ((isset($element[EN_FLAGS]))?$element[EN_FLAGS]:"")));
$this->ungetElement($element);
}
return false;
}
/**
* 'Ungets' an element writing it into a buffer to be 'get' again
*
* @param element $element the element to get ungetten
*
* @access public
* @return
*/
public function ungetElement($element) {
if($this->ungetbuffer)
ZLog::Write(LOGLEVEL_ERROR,sprintf("WBXMLDecoder->ungetElement(): WBXML double unget on tag: '%s' type '%s' flags '%s'", ((isset($element[EN_TAG]))?$element[EN_TAG]:""), ((isset($element[EN_TYPE]))?$element[EN_TYPE]:""), ((isset($element[EN_FLAGS]))?$element[EN_FLAGS]:"")));
$this->ungetbuffer = $element;
}
/**
* Returns the plain input stream
*
* @access public
* @return string
*/
public function GetPlainInputStream() {
return $this->inputBuffer.stream_get_contents($this->in);
}
/**
* Returns if the input is WBXML
*
* @access public
* @return boolean
*/
public function IsWBXML() {
return $this->isWBXML;
}
/**
* Reads the remaning data from the input stream
*
* @access public
* @return void
*/
public function readRemainingData() {
ZLog::Write(LOGLEVEL_DEBUG, "WBXMLDecoder->readRemainingData() reading remaining data from input stream");
while($this->getElement());
}
/**----------------------------------------------------------------------------------------------------------
* Private WBXMLDecoder stuff
*/
/**
* Returns the next token
*
* @access private
* @return token
*/
private function getToken() {
// See if there's something in the ungetBuffer
if($this->ungetbuffer) {
$element = $this->ungetbuffer;
$this->ungetbuffer = false;
return $element;
}
$el = $this->_getToken();
if($this->log)
$this->logToken($el);
return $el;
}
/**
* Log the a token to ZLog
*
* @param string $el token
*
* @access private
* @return
*/
private function logToken($el) {
$spaces = str_repeat(" ", count($this->logStack));
switch($el[EN_TYPE]) {
case EN_TYPE_STARTTAG:
if($el[EN_FLAGS] & EN_FLAGS_CONTENT) {
ZLog::Write(LOGLEVEL_WBXML,"I " . $spaces . " <". $el[EN_TAG] . ">");
array_push($this->logStack, $el[EN_TAG]);
} else
ZLog::Write(LOGLEVEL_WBXML,"I " . $spaces . " <" . $el[EN_TAG] . "/>");
break;
case EN_TYPE_ENDTAG:
$tag = array_pop($this->logStack);
ZLog::Write(LOGLEVEL_WBXML,"I " . $spaces . "</" . $tag . ">");
break;
case EN_TYPE_CONTENT:
// as we concatenate the string here, the entire content is copied.
// when sending an email with an attachment this single log line (which is never logged in INFO)
// requires easily additional 20 MB of RAM. See https://jira.z-hub.io/browse/ZP-1159
$messagesize = strlen($el[EN_CONTENT]);
if ($messagesize > 10240 && !defined('WBXML_DEBUGGING')) {
$content = substr($el[EN_CONTENT], 0, 10240) . sprintf(" <log message with %d bytes truncated>", $messagesize);
}
else {
$content = $el[EN_CONTENT];
}
// Log but make sure it's not truncated again (will be slightly bigger than 10KB)
ZLog::Write(LOGLEVEL_WBXML,"I " . $spaces . " " . $content, false);
break;
}
}
/**
* Returns either a start tag, content or end tag
*
* @access private
* @return
*/
private function _getToken() {
// Get the data from the input stream
$element = array();
WBXMLDecoder::ResetInWhile("decoderGetToken");
while(WBXMLDecoder::InWhile("decoderGetToken")) {
$byte = fread($this->in, 1);
if($byte === "" || $byte === false)
break;
$byte = ord($byte);
switch($byte) {
case self::WBXML_SWITCH_PAGE:
$this->tagcp = $this->getByte();
break;
case self::WBXML_END:
$element[EN_TYPE] = EN_TYPE_ENDTAG;
return $element;
case self::WBXML_STR_I:
$element[EN_TYPE] = EN_TYPE_CONTENT;
$element[EN_CONTENT] = $this->getTermStr();
return $element;
case self::WBXML_OPAQUE:
$length = $this->getMBUInt();
$element[EN_TYPE] = EN_TYPE_CONTENT;
$element[EN_CONTENT] = $this->getOpaque($length);
return $element;
case self::WBXML_ENTITY:
case self::WBXML_LITERAL:
case self::WBXML_EXT_I_0:
case self::WBXML_EXT_I_1:
case self::WBXML_EXT_I_2:
case self::WBXML_PI:
case self::WBXML_LITERAL_C:
case self::WBXML_EXT_T_0:
case self::WBXML_EXT_T_1:
case self::WBXML_EXT_T_2:
case self::WBXML_STR_T:
case self::WBXML_LITERAL_A:
case self::WBXML_EXT_0:
case self::WBXML_EXT_1:
case self::WBXML_EXT_2:
case self::WBXML_LITERAL_AC:
throw new WBXMLException("Invalid token :".$byte);
default:
if($byte & self::WBXML_WITH_ATTRIBUTES)
throw new WBXMLException("Attributes are not allowed :".$byte);
$element[EN_TYPE] = EN_TYPE_STARTTAG;
$element[EN_TAG] = $this->getMapping($this->tagcp, $byte & 0x3f);
$element[EN_FLAGS] = ($byte & self::WBXML_WITH_CONTENT ? EN_FLAGS_CONTENT : 0);
return $element;
}
}
}
/**
* Reads from the stream until getting a string terminator
*
* @access private
* @return string
*/
private function getTermStr() {
if (defined('WBXML_DEBUGGING') && WBXML_DEBUGGING === true) {
$str = "";
while (1) {
$in = $this->getByte();
if ($in == 0) {
break;
}
else {
$str .= chr($in);
}
}
return $str;
}
// there is no unlimited "length" for stream_get_line,
// so we use a huge value for "length" param (1Gb)
// (0 == PHP_SOCK_CHUNK_SIZE (8192))
// internaly php read at most PHP_SOCK_CHUNK_SIZE at a time,
// so we can use a huge value for "length" without problem
return stream_get_line($this->in, 1073741824, "\0");
}
/**
* Reads $len from the input stream
*
* @param int $len
*
* @access private
* @return string
*/
private function getOpaque($len) {
$d = stream_get_contents($this->in, $len);
if ($d === false)
throw new HTTPReturnCodeException("WBXMLDecoder->getOpaque(): stream_get_contents === false", HTTP_CODE_500, null, LOGLEVEL_WARN);
$l = strlen($d);
if ($l !== $len)
throw new HTTPReturnCodeException("WBXMLDecoder->getOpaque(): only $l byte read instead of $len", HTTP_CODE_500, null, LOGLEVEL_WARN);
return $d;
}
/**
* Reads one byte from the input stream
*
* @access private
* @return int
*/
private function getByte() {
$ch = fread($this->in, 1);
if(strlen($ch) > 0)
return ord($ch);
else
return;
}
/**
* Reads string length from the input stream
*
* @access private
* @return
*/
private function getMBUInt() {
$uint = 0;
while(1) {
$byte = $this->getByte();
$uint |= $byte & 0x7f;
if($byte & 0x80)
$uint = $uint << 7;
else
break;
}
return $uint;
}
/**
* Returns the mapping for a specified codepage and id
*
* @param $cp codepage
* @param $id
*
* @access public
* @return string
*/
private function getMapping($cp, $id) {
if(!isset($this->dtd["codes"][$cp]) || !isset($this->dtd["codes"][$cp][$id]))
return false;
else {
if(isset($this->dtd["namespaces"][$cp])) {
return $this->dtd["namespaces"][$cp] . ":" . $this->dtd["codes"][$cp][$id];
} else
return $this->dtd["codes"][$cp][$id];
}
}
}