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tnef_decoder.php
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tnef_decoder.php
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<?php
/**
* The Horde's class allows MS-TNEF data to be displayed.
*
* The TNEF rendering is based on code by:
* Graham Norbury <gnorbury@bondcar.com>
* Original design by:
* Thomas Boll <tb@boll.ch>, Mark Simpson <damned@world.std.com>
*
* Copyright 2002-2010 The Horde Project (http://www.horde.org/)
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*
* @author Jan Schneider <jan@horde.org>
* @author Michael Slusarz <slusarz@horde.org>
* @package Horde_Compress
*/
class tnef_decoder
{
const SIGNATURE = 0x223e9f78;
const LVL_MESSAGE = 0x01;
const LVL_ATTACHMENT = 0x02;
const ASUBJECT = 0x88004;
const AMCLASS = 0x78008;
const ATTACHDATA = 0x6800f;
const AFILENAME = 0x18010;
const ARENDDATA = 0x69002;
const AMAPIATTRS = 0x69005;
const AVERSION = 0x89006;
const MAPI_NULL = 0x0001;
const MAPI_SHORT = 0x0002;
const MAPI_INT = 0x0003;
const MAPI_FLOAT = 0x0004;
const MAPI_DOUBLE = 0x0005;
const MAPI_CURRENCY = 0x0006;
const MAPI_APPTIME = 0x0007;
const MAPI_ERROR = 0x000a;
const MAPI_BOOLEAN = 0x000b;
const MAPI_OBJECT = 0x000d;
const MAPI_INT8BYTE = 0x0014;
const MAPI_STRING = 0x001e;
const MAPI_UNICODE_STRING = 0x001f;
const MAPI_SYSTIME = 0x0040;
const MAPI_CLSID = 0x0048;
const MAPI_BINARY = 0x0102;
const MAPI_ATTACH_LONG_FILENAME = 0x3707;
const MAPI_ATTACH_MIME_TAG = 0x370E;
const MAPI_NAMED_TYPE_ID = 0x0000;
const MAPI_NAMED_TYPE_STRING = 0x0001;
const MAPI_MV_FLAG = 0x1000;
/**
* Decompress the data.
*
* @param string $data The data to decompress.
* @param array $params An array of arguments needed to decompress the
* data.
*
* @return mixed The decompressed data.
*/
public function decompress($data, $params = array())
{
$out = array();
if ($this->_geti($data, 32) == self::SIGNATURE) {
$this->_geti($data, 16);
while (strlen($data) > 0) {
switch ($this->_geti($data, 8)) {
case self::LVL_MESSAGE:
$this->_decodeMessage($data);
break;
case self::LVL_ATTACHMENT:
$this->_decodeAttachment($data, $out);
break;
}
}
}
return array_reverse($out);
}
/**
* TODO
*
* @param string &$data The data string.
* @param integer $bits How many bits to retrieve.
*
* @return TODO
*/
protected function _getx(&$data, $bits)
{
$value = null;
if (strlen($data) >= $bits) {
$value = substr($data, 0, $bits);
$data = substr_replace($data, '', 0, $bits);
}
return $value;
}
/**
* TODO
*
* @param string &$data The data string.
* @param integer $bits How many bits to retrieve.
*
* @return TODO
*/
protected function _geti(&$data, $bits)
{
$bytes = $bits / 8;
$value = null;
if (strlen($data) >= $bytes) {
$value = ord($data[0]);
if ($bytes >= 2) {
$value += (ord($data[1]) << 8);
}
if ($bytes >= 4) {
$value += (ord($data[2]) << 16) + (ord($data[3]) << 24);
}
$data = substr_replace($data, '', 0, $bytes);
}
return $value;
}
/**
* TODO
*
* @param string &$data The data string.
* @param string $attribute TODO
*/
protected function _decodeAttribute(&$data, $attribute)
{
/* Data. */
$this->_getx($data, $this->_geti($data, 32));
/* Checksum. */
$this->_geti($data, 16);
}
/**
* TODO
*
* @param string $data The data string.
* @param array &$attachment_data TODO
*/
protected function _extractMapiAttributes($data, &$attachment_data)
{
/* Number of attributes. */
$number = $this->_geti($data, 32);
while ((strlen($data) > 0) && $number--) {
$have_mval = false;
$num_mval = 1;
$named_id = $value = null;
$attr_type = $this->_geti($data, 16);
$attr_name = $this->_geti($data, 16);
if (($attr_type & self::MAPI_MV_FLAG) != 0) {
$have_mval = true;
$attr_type = $attr_type & ~self::MAPI_MV_FLAG;
}
if (($attr_name >= 0x8000) && ($attr_name < 0xFFFE)) {
$this->_getx($data, 16);
$named_type = $this->_geti($data, 32);
switch ($named_type) {
case self::MAPI_NAMED_TYPE_ID:
$named_id = $this->_geti($data, 32);
$attr_name = $named_id;
break;
case self::MAPI_NAMED_TYPE_STRING:
$attr_name = 0x9999;
$idlen = $this->_geti($data, 32);
$datalen = $idlen + ((4 - ($idlen % 4)) % 4);
$named_id = substr($this->_getx($data, $datalen), 0, $idlen);
break;
}
}
if ($have_mval) {
$num_mval = $this->_geti($data, 32);
}
switch ($attr_type) {
case self::MAPI_SHORT:
$value = $this->_geti($data, 16);
break;
case self::MAPI_INT:
case self::MAPI_BOOLEAN:
for ($i = 0; $i < $num_mval; $i++) {
$value = $this->_geti($data, 32);
}
break;
case self::MAPI_FLOAT:
case self::MAPI_ERROR:
$value = $this->_getx($data, 4);
break;
case self::MAPI_DOUBLE:
case self::MAPI_APPTIME:
case self::MAPI_CURRENCY:
case self::MAPI_INT8BYTE:
case self::MAPI_SYSTIME:
$value = $this->_getx($data, 8);
break;
case self::MAPI_STRING:
case self::MAPI_UNICODE_STRING:
case self::MAPI_BINARY:
case self::MAPI_OBJECT:
$num_vals = ($have_mval) ? $num_mval : $this->_geti($data, 32);
for ($i = 0; $i < $num_vals; $i++) {
$length = $this->_geti($data, 32);
/* Pad to next 4 byte boundary. */
$datalen = $length + ((4 - ($length % 4)) % 4);
if ($attr_type == self::MAPI_STRING) {
--$length;
}
/* Read and truncate to length. */
$value = substr($this->_getx($data, $datalen), 0, $length);
}
break;
}
/* Store any interesting attributes. */
switch ($attr_name) {
case self::MAPI_ATTACH_LONG_FILENAME:
$value = str_replace("\0", '', $value);
/* Used in preference to AFILENAME value. */
$attachment_data[0]['name'] = preg_replace('/.*[\/](.*)$/', '\1', $value);
break;
case self::MAPI_ATTACH_MIME_TAG:
$value = str_replace("\0", '', $value);
/* Is this ever set, and what is format? */
$attachment_data[0]['type'] = preg_replace('/^(.*)\/.*/', '\1', $value);
$attachment_data[0]['subtype'] = preg_replace('/.*\/(.*)$/', '\1', $value);
break;
}
}
}
/**
* TODO
*
* @param string &$data The data string.
*/
protected function _decodeMessage(&$data)
{
$this->_decodeAttribute($data, $this->_geti($data, 32));
}
/**
* TODO
*
* @param string &$data The data string.
* @param array &$attachment_data TODO
*/
protected function _decodeAttachment(&$data, &$attachment_data)
{
$attribute = $this->_geti($data, 32);
switch ($attribute) {
case self::ARENDDATA:
/* Marks start of new attachment. */
$this->_getx($data, $this->_geti($data, 32));
/* Checksum */
$this->_geti($data, 16);
/* Add a new default data block to hold details of this
attachment. Reverse order is easier to handle later! */
array_unshift($attachment_data, array('type' => 'application',
'subtype' => 'octet-stream',
'name' => 'unknown',
'stream' => ''));
break;
case self::AFILENAME:
$value = $this->_getx($data, $this->_geti($data, 32));
$value = str_replace("\0", '', $value);
/* Strip path. */
$attachment_data[0]['name'] = preg_replace('/.*[\/](.*)$/', '\1', $value);
/* Checksum */
$this->_geti($data, 16);
break;
case self::ATTACHDATA:
/* The attachment itself. */
$length = $this->_geti($data, 32);
$attachment_data[0]['size'] = $length;
$attachment_data[0]['stream'] = $this->_getx($data, $length);
/* Checksum */
$this->_geti($data, 16);
break;
case self::AMAPIATTRS:
$length = $this->_geti($data, 32);
$value = $this->_getx($data, $length);
/* Checksum */
$this->_geti($data, 16);
$this->_extractMapiAttributes($value, $attachment_data);
break;
default:
$this->_decodeAttribute($data, $attribute);
}
}
}

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