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child, that has executed a php script with mbstring.func_overload=7 once, will overload substr() in a later execution of another php script, even if the Location context of that script has mbstring.func_overload=0 set. Since the WBXML decoder works byte-by-byte to determine substring length, it fails, if mb_substr() is used. This patch prevents this.
685 lines
21 KiB
PHP
685 lines
21 KiB
PHP
<?php
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include_once 'XML/WBXML.php';
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include_once 'XML/WBXML/DTDManager.php';
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include_once 'XML/WBXML/ContentHandler.php';
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/**
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* $Horde: framework/XML_WBXML/WBXML/Decoder.php,v 1.36 2006/01/01 21:10:25 jan Exp $
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*
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* Copyright 2003-2006 Anthony Mills <amills@pyramid6.com>
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*
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* See the enclosed file COPYING for license information (LGPL). If you
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* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
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*
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* From Binary XML Content Format Specification Version 1.3, 25 July
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* 2001 found at http://www.wapforum.org
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*
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* @package XML_WBXML
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*/
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class XML_WBXML_Decoder extends XML_WBXML_ContentHandler {
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/**
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* Document Public Identifier type
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* 1 mb_u_int32 well known type
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* 2 string table
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* from spec but converted into a string.
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*
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* Document Public Identifier
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* Used with dpiType.
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*/
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var $_dpi;
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/**
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* String table as defined in 5.7
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*/
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var $_stringTable = array();
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/**
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* Content handler.
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* Currently just outputs raw XML.
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*/
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var $_ch;
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var $_tagDTD;
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var $_prevAttributeDTD;
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var $_attributeDTD;
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/**
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* State variables.
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*/
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var $_tagStack = array();
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var $_isAttribute;
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var $_isData = false;
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var $_error = false;
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/**
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* The DTD Manager.
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*
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* @var XML_WBXML_DTDManager
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*/
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var $_dtdManager;
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/**
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* The string position.
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*
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* @var integer
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*/
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var $_strpos;
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/**
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* Constructor.
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*/
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function XML_WBXML_Decoder()
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{
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$this->_dtdManager = &new XML_WBXML_DTDManager();
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}
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/**
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* Sets the contentHandler that will receive the output of the
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* decoding.
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*
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* @param XML_WBXML_ContentHandler $ch The contentHandler
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*/
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function setContentHandler(&$ch) {
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$this->_ch = &$ch;
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}
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/**
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* Return one byte from the input stream.
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*
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* @param string $input The WBXML input string.
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*/
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function getByte($input)
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{
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$value = $input{$this->_strpos++};
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$value = ord($value);
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return $value;
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}
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/**
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* Takes a WBXML input document and returns decoded XML.
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* However the preferred and more effecient method is to
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* use decode() rather than decodeToString() and have an
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* appropriate contentHandler deal with the decoded data.
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*
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* @param string $wbxml The WBXML document to decode.
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*
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* @return string The decoded XML document.
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*/
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function decodeToString($wbxml)
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{
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$this->_ch = &new XML_WBXML_ContentHandler();
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$r = $this->decode($wbxml);
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if (is_a($r, 'PEAR_Error')) {
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return $r;
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}
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return $this->_ch->getOutput();
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}
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/**
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* Takes a WBXML input document and decodes it.
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* Decoding result is directly passed to the contentHandler.
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* A contenthandler must be set using setContentHandler
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* prior to invocation of this method
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*
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* @param string $wbxml The WBXML document to decode.
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*
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* @return mixed True on success or PEAR_Error.
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*/
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function decode($wbxml)
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{
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// fix for Nokia Series 60 which seem to send empty data block sometimes
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if(strlen($wbxml) == 0) {
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return true;
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}
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$this->_error = false; // reset state
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$this->_strpos = 0;
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if (empty($this->_ch)) {
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return $this->raiseError('No Contenthandler defined.');
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}
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// Get Version Number from Section 5.4
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// version = u_int8
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// currently 1, 2 or 3
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$this->_wbxmlVersion = $this->getVersionNumber($wbxml);
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// Get Document Public Idetifier from Section 5.5
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// publicid = mb_u_int32 | (zero index)
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// zero = u_int8
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// Containing the value zero (0)
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// The actual DPI is determined after the String Table is read.
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$dpiStruct = $this->getDocumentPublicIdentifier($wbxml);
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// Get Charset from 5.6
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// charset = mb_u_int32
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$this->_charset = $this->getCharset($wbxml);
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// Get String Table from 5.7
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// strb1 = length *byte
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$this->retrieveStringTable($wbxml);
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// Get Document Public Idetifier from Section 5.5.
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$this->_dpi = $this->getDocumentPublicIdentifierImpl($dpiStruct['dpiType'],
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$dpiStruct['dpiNumber'],
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$this->_stringTable);
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// Now the real fun begins.
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// From Sections 5.2 and 5.8
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// Default content handler.
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$this->_dtdManager = &new XML_WBXML_DTDManager();
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// Get the starting DTD.
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$this->_tagDTD = $this->_dtdManager->getInstance($this->_dpi);
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if (!$this->_tagDTD) {
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return $this->raiseError('No DTD found for '
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. $this->_dpi . '/'
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. $dpiStruct['dpiNumber']);
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}
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$this->_attributeDTD = $this->_tagDTD;
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while (empty($this->_error) && $this->_strpos < strlen($wbxml)) {
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$this->_decode($wbxml);
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}
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if (!empty($this->_error)) {
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return $this->_error;
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}
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return true;
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}
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function getVersionNumber($input)
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{
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return $this->getByte($input);
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}
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function getDocumentPublicIdentifier($input)
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{
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$i = XML_WBXML::MBUInt32ToInt($input, $this->_strpos);
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if ($i == 0) {
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return array('dpiType' => 2,
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'dpiNumber' => $this->getByte($input));
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} else {
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return array('dpiType' => 1,
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'dpiNumber' => $i);
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}
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}
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function getDocumentPublicIdentifierImpl($dpiType, $dpiNumber)
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{
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if ($dpiType == 1) {
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return XML_WBXML::getDPIString($dpiNumber);
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} else {
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return $this->getStringTableEntry($dpiNumber);
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}
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}
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/**
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* Returns the character encoding. Only default character
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* encodings from J2SE are supported. From
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* http://www.iana.org/assignments/character-sets and
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* http://java.sun.com/j2se/1.4.2/docs/api/java/nio/charset/Charset.html
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*/
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function getCharset($input)
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{
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$cs = XML_WBXML::MBUInt32ToInt($input, $this->_strpos);
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return XML_WBXML::getCharsetString($cs);
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}
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/**
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* Retrieves the string table.
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* The string table consists of an mb_u_int32 length
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* and then length bytes forming the table.
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* References to the string table refer to the
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* starting position of the (null terminated)
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* string in this table.
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*/
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function retrieveStringTable($input)
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{
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$size = XML_WBXML::MBUInt32ToInt($input, $this->_strpos);
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$this->_stringTable = $this->_substr($input, $this->_strpos, $size);
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$this->_strpos += $size;
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// print "stringtable($size):" . $this->_stringTable ."\n";
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}
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function getStringTableEntry($index)
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{
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if ($index >= strlen($this->_stringTable)) {
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$this->_error =
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$this->_ch->raiseError('Invalid offset ' . $index
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. ' value encountered around position '
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. $this->_strpos
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. '. Broken wbxml?');
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return '';
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}
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// copy of method termstr but without modification of this->_strpos
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$str = '#'; // must start with nonempty string to allow array access
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$i = 0;
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$ch = $this->_stringTable[$index++];
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if (ord($ch) == 0) {
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return ''; // don't return '#'
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}
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while (ord($ch) != 0) {
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$str[$i++] = $ch;
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if ($index >= strlen($this->_stringTable)) {
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break;
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}
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$ch = $this->_stringTable[$index++];
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}
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// print "string table entry: $str\n";
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return $str;
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}
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function _decode($input)
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{
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$token = $this->getByte($input);
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$str = '';
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#print "position: " . $this->_strpos . " token: " . $token . " str10: " . substr($input, $this->_strpos, 10) . "\n"; // @todo: remove debug output
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switch ($token) {
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case XML_WBXML_GLOBAL_TOKEN_STR_I:
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// Section 5.8.4.1
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$str = $this->termstr($input);
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$this->_ch->characters($str);
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// print "str:$str\n"; // @TODO Remove debug code
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break;
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case XML_WBXML_GLOBAL_TOKEN_STR_T:
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// Section 5.8.4.1
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$x = XML_WBXML::MBUInt32ToInt($input, $this->_strpos);
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$str = $this->getStringTableEntry($x);
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$this->_ch->characters($str);
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break;
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case XML_WBXML_GLOBAL_TOKEN_EXT_I_0:
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case XML_WBXML_GLOBAL_TOKEN_EXT_I_1:
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case XML_WBXML_GLOBAL_TOKEN_EXT_I_2:
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// Section 5.8.4.2
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$str = $this->termstr($input);
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$this->_ch->characters($str);
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break;
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case XML_WBXML_GLOBAL_TOKEN_EXT_T_0:
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case XML_WBXML_GLOBAL_TOKEN_EXT_T_1:
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case XML_WBXML_GLOBAL_TOKEN_EXT_T_2:
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// Section 5.8.4.2
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$str = $this->getStringTableEnty(XML_WBXML::MBUInt32ToInt($input, $this->_strpos));
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$this->_ch->characters($str);
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break;
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case XML_WBXML_GLOBAL_TOKEN_EXT_0:
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case XML_WBXML_GLOBAL_TOKEN_EXT_1:
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case XML_WBXML_GLOBAL_TOKEN_EXT_2:
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// Section 5.8.4.2
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$extension = $this->getByte($input);
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$this->_ch->characters($extension);
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break;
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case XML_WBXML_GLOBAL_TOKEN_ENTITY:
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// Section 5.8.4.3
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// UCS-4 chracter encoding?
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$entity = $this->entity(XML_WBXML::MBUInt32ToInt($input, $this->_strpos));
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$this->_ch->characters('&#' . $entity . ';');
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break;
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case XML_WBXML_GLOBAL_TOKEN_PI:
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// Section 5.8.4.4
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// throw new IOException
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// die("WBXML global token processing instruction(PI, " + token + ") is unsupported!\n");
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break;
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case XML_WBXML_GLOBAL_TOKEN_LITERAL:
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// Section 5.8.4.5
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$str = $this->getStringTableEntry(XML_WBXML::MBUInt32ToInt($input, $this->_strpos));
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$this->parseTag($input, $str, false, false);
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break;
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case XML_WBXML_GLOBAL_TOKEN_LITERAL_A:
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// Section 5.8.4.5
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$str = $this->getStringTableEntry(XML_WBXML::MBUInt32ToInt($input, $this->_strpos));
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$this->parseTag($input, $str, true, false);
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break;
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case XML_WBXML_GLOBAL_TOKEN_LITERAL_AC:
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// Section 5.8.4.5
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$str = $this->getStringTableEntry(XML_WBXML::MBUInt32ToInt($input, $this->_strpos));
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$this->parseTag($input, $string, true, true);
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break;
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case XML_WBXML_GLOBAL_TOKEN_LITERAL_C:
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// Section 5.8.4.5
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$str = $this->getStringTableEntry(XML_WBXML::MBUInt32ToInt($input, $this->_strpos));
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$this->parseTag($input, $str, false, true);
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break;
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case XML_WBXML_GLOBAL_TOKEN_OPAQUE:
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// Section 5.8.4.6
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$size = XML_WBXML::MBUInt32ToInt($input, $this->_strpos);
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// print "opaque of size $size\n"; // @todo remove debug
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$b = $this->_substr($input, $this->_strpos, $size);
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#$b = mb_substr($input, $this->_strpos, $size, 'ISO-8859-1');
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$this->_strpos += $size;
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// opaque data inside a <data> element may or may not be
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// a nested wbxml document (for example devinf data).
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// We find out by checking the first byte of the data: if it's
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// 1, 2 or 3 we expect it to be the version number of a wbxml
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// document and thus start a new wbxml decoder instance on it.
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if ($this->_isData && ord($b) <= 10) {
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$decoder = &new XML_WBXML_Decoder(true);
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$decoder->setContentHandler($this->_ch);
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$s = $decoder->decode($b);
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// /* // @todo: FIXME currently we can't decode Nokia
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// DevInf data. So ignore error for the time beeing.
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if (is_a($s, 'PEAR_Error')) {
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$this->_error = $s;
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return;
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}
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// */
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// $this->_ch->characters($s);
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} else {
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/* normal opaque behaviour: just copy the raw data: */
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$this->_ch->characters( $b);
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}
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// old approach to deal with opaque data inside ContentHandler:
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// FIXME Opaque is used by SYNCML. Opaque data that depends on the context
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// if (contentHandler instanceof OpaqueContentHandler) {
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// ((OpaqueContentHandler)contentHandler).opaque(b);
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// } else {
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// String str = new String(b, 0, size, charset);
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// char[] chars = str.toCharArray();
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// contentHandler.characters(chars, 0, chars.length);
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// }
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break;
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case XML_WBXML_GLOBAL_TOKEN_END:
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// Section 5.8.4.7.1
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$str = $this->endTag();
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break;
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case XML_WBXML_GLOBAL_TOKEN_SWITCH_PAGE:
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// Section 5.8.4.7.2
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$codePage = $this->getByte($input);
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// print "switch to codepage $codePage\n"; // @todo: remove debug code
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$this->switchElementCodePage($codePage);
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break;
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default:
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// Section 5.8.2
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// Section 5.8.3
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$hasAttributes = (($token & 0x80) != 0);
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$hasContent = (($token & 0x40) != 0);
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$realToken = $token & 0x3F;
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$str = $this->getTag($realToken);
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// print "element:$str\n"; // @TODO Remove debug code
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$this->parseTag($input, $str, $hasAttributes, $hasContent);
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if ($realToken == 0x0f) {
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// store if we're inside a Data tag. This may contain
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// an additional enclosed wbxml document on which we have
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// to run a seperate encoder
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$this->_isData = true;
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} else {
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$this->_isData = false;
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}
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break;
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}
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}
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function parseTag($input, $tag, $hasAttributes, $hasContent)
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{
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$attrs = array();
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if ($hasAttributes) {
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$attrs = $this->getAttributes($input);
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}
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$this->_ch->startElement($this->getCurrentURI(), $tag, $attrs);
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if ($hasContent) {
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// FIXME I forgot what does this does. Not sure if this is
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// right?
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$this->_tagStack[] = $tag;
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} else {
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$this->_ch->endElement($this->getCurrentURI(), $tag);
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}
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}
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function endTag()
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{
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if (count($this->_tagStack)) {
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$tag = array_pop($this->_tagStack);
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} else {
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$tag = 'Unknown';
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}
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$this->_ch->endElement($this->getCurrentURI(), $tag);
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return $tag;
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}
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function getAttributes($input)
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{
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$this->startGetAttributes();
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$hasMoreAttributes = true;
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$attrs = array();
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$attr = null;
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$value = null;
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$token = null;
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while ($hasMoreAttributes) {
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$token = $this->getByte($input);
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switch ($token) {
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// Attribute specified.
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case XML_WBXML_GLOBAL_TOKEN_LITERAL:
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// Section 5.8.4.5
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if (isset($attr)) {
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$attrs[] = array('attribute' => $attr,
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'value' => $value);
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}
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$attr = $this->getStringTableEntry(XML_WBXML::MBUInt32ToInt($input, $this->_strpos));
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break;
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// Value specified.
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case XML_WBXML_GLOBAL_TOKEN_EXT_I_0:
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case XML_WBXML_GLOBAL_TOKEN_EXT_I_1:
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case XML_WBXML_GLOBAL_TOKEN_EXT_I_2:
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// Section 5.8.4.2
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$value .= $this->termstr($input);
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break;
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case XML_WBXML_GLOBAL_TOKEN_EXT_T_0:
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case XML_WBXML_GLOBAL_TOKEN_EXT_T_1:
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case XML_WBXML_GLOBAL_TOKEN_EXT_T_2:
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// Section 5.8.4.2
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$value .= $this->getStringTableEntry(XML_WBXML::MBUInt32ToInt($input, $this->_strpos));
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break;
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case XML_WBXML_GLOBAL_TOKEN_EXT_0:
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case XML_WBXML_GLOBAL_TOKEN_EXT_1:
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case XML_WBXML_GLOBAL_TOKEN_EXT_2:
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// Section 5.8.4.2
|
|
$value .= $input[$this->_strpos++];
|
|
break;
|
|
|
|
case XML_WBXML_GLOBAL_TOKEN_ENTITY:
|
|
// Section 5.8.4.3
|
|
$value .= $this->entity(XML_WBXML::MBUInt32ToInt($input, $this->_strpos));
|
|
break;
|
|
|
|
case XML_WBXML_GLOBAL_TOKEN_STR_I:
|
|
// Section 5.8.4.1
|
|
$value .= $this->termstr($input);
|
|
break;
|
|
|
|
case XML_WBXML_GLOBAL_TOKEN_STR_T:
|
|
// Section 5.8.4.1
|
|
$value .= $this->getStringTableEntry(XML_WBXML::MBUInt32ToInt($input, $this->_strpos));
|
|
break;
|
|
|
|
case XML_WBXML_GLOBAL_TOKEN_OPAQUE:
|
|
// Section 5.8.4.6
|
|
$size = XML_WBXML::MBUInt32ToInt($input, $this->_strpos);
|
|
$b = $this->_substr($input, $this->_strpos, $this->_strpos + $size);
|
|
$this->_strpos += $size;
|
|
|
|
$value .= $b;
|
|
break;
|
|
|
|
case XML_WBXML_GLOBAL_TOKEN_END:
|
|
// Section 5.8.4.7.1
|
|
$hasMoreAttributes = false;
|
|
if (isset($attr)) {
|
|
$attrs[] = array('attribute' => $attr,
|
|
'value' => $value);
|
|
}
|
|
break;
|
|
|
|
case XML_WBXML_GLOBAL_TOKEN_SWITCH_PAGE:
|
|
// Section 5.8.4.7.2
|
|
$codePage = $this->getByte($input);
|
|
if (!$this->_prevAttributeDTD) {
|
|
$this->_prevAttributeDTD = $this->_attributeDTD;
|
|
}
|
|
|
|
$this->switchAttributeCodePage($codePage);
|
|
break;
|
|
|
|
default:
|
|
if ($token > 128) {
|
|
if (isset($attr)) {
|
|
$attrs[] = array('attribute' => $attr,
|
|
'value' => $value);
|
|
}
|
|
$attr = $this->_attributeDTD->toAttribute($token);
|
|
} else {
|
|
// Value.
|
|
$value .= $this->_attributeDTD->toAttribute($token);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!$this->_prevAttributeDTD) {
|
|
$this->_attributeDTD = $this->_prevAttributeDTD;
|
|
$this->_prevAttributeDTD = false;
|
|
}
|
|
|
|
$this->stopGetAttributes();
|
|
}
|
|
|
|
function startGetAttributes()
|
|
{
|
|
$this->_isAttribute = true;
|
|
}
|
|
|
|
function stopGetAttributes()
|
|
{
|
|
$this->_isAttribute = false;
|
|
}
|
|
|
|
function getCurrentURI()
|
|
{
|
|
if ($this->_isAttribute) {
|
|
return $this->_tagDTD->getURI();
|
|
} else {
|
|
return $this->_attributeDTD->getURI();
|
|
}
|
|
}
|
|
|
|
function writeString($str)
|
|
{
|
|
$this->_ch->characters($str);
|
|
}
|
|
|
|
function getTag($tag)
|
|
{
|
|
// Should know which state it is in.
|
|
return $this->_tagDTD->toTagStr($tag);
|
|
}
|
|
|
|
function getAttribute($attribute)
|
|
{
|
|
// Should know which state it is in.
|
|
$this->_attributeDTD->toAttributeInt($attribute);
|
|
}
|
|
|
|
function switchElementCodePage($codePage)
|
|
{
|
|
$this->_tagDTD = &$this->_dtdManager->getInstance($this->_tagDTD->toCodePageStr($codePage));
|
|
$this->switchAttributeCodePage($codePage);
|
|
}
|
|
|
|
function switchAttributeCodePage($codePage)
|
|
{
|
|
$this->_attributeDTD = &$this->_dtdManager->getInstance($this->_attributeDTD->toCodePageStr($codePage));
|
|
}
|
|
|
|
/**
|
|
* Return the hex version of the base 10 $entity.
|
|
*/
|
|
function entity($entity)
|
|
{
|
|
return dechex($entity);
|
|
}
|
|
|
|
/**
|
|
* Reads a null terminated string.
|
|
*/
|
|
function termstr($input)
|
|
{
|
|
$str = '#'; // must start with nonempty string to allow array access
|
|
$i = 0;
|
|
$ch = $input[$this->_strpos++];
|
|
if (ord($ch) == 0) {
|
|
return ''; // don't return '#'
|
|
}
|
|
while (ord($ch) != 0) {
|
|
$str[$i++] = $ch;
|
|
$ch = $input[$this->_strpos++];
|
|
}
|
|
|
|
return $str;
|
|
}
|
|
|
|
/**
|
|
* imitate substr()
|
|
* This circumvents a bug in the mbstring overloading in some distributions,
|
|
* where the mbstring.func_overload=0 INI-setting does not work, if mod_php
|
|
* has another value for that setting in another directory-context
|
|
*/
|
|
function _substr($input,$start,$size)
|
|
{
|
|
$ret = "";
|
|
if (!$input) return $ret;
|
|
for ($i = $start; $i < $start+$size; $i++) {
|
|
$ret .= $input[$i];
|
|
}
|
|
return $ret;
|
|
}
|
|
|
|
}
|
|
|