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<?php
/*
* tnef_decoder.php
* Graham Norbury <gnorbury@bondcar.com>
* (c) 2002 (GNU GPL - see ../../COPYING)
*
* Functions for decoding TNEF attachments in native PHP
*
* Adapted from original designs by:
* Thomas Boll <tb@boll.ch> [tnef.c]
* Mark Simpson <damned@world.std.com> [tnef-1.1.1]
*
*/
define("TNEF_SIGNATURE", 0x223e9f78);
define("TNEF_LVL_MESSAGE", 0x01);
define("TNEF_LVL_ATTACHMENT", 0x02);
define("TNEF_STRING", 0x00010000);
define("TNEF_TEXT", 0x00020000);
define("TNEF_BYTE", 0x00060000);
define("TNEF_WORD", 0x00070000);
define("TNEF_DWORD", 0x00080000);
define("TNEF_ASUBJECT", TNEF_DWORD | 0x8004);
define("TNEF_AMCLASS", TNEF_WORD | 0x8008);
define("TNEF_BODYTEXT", TNEF_TEXT | 0x800c);
define("TNEF_ATTACHDATA", TNEF_BYTE | 0x800f);
define("TNEF_AFILENAME", TNEF_STRING | 0x8010);
define("TNEF_ARENDDATA", TNEF_BYTE | 0x9002);
define("TNEF_AMAPIATTRS", TNEF_BYTE | 0x9005);
define("TNEF_AVERSION", TNEF_DWORD | 0x9006);
define("TNEF_MAPI_NULL", 0x0001);
define("TNEF_MAPI_SHORT", 0x0002);
define("TNEF_MAPI_INT", 0x0003);
define("TNEF_MAPI_FLOAT", 0x0004);
define("TNEF_MAPI_DOUBLE", 0x0005);
define("TNEF_MAPI_CURRENCY", 0x0006);
define("TNEF_MAPI_APPTIME", 0x0007);
define("TNEF_MAPI_ERROR", 0x000a);
define("TNEF_MAPI_BOOLEAN", 0x000b);
define("TNEF_MAPI_OBJECT", 0x000d);
define("TNEF_MAPI_INT8BYTE", 0x0014);
define("TNEF_MAPI_STRING", 0x001e);
define("TNEF_MAPI_UNICODE_STRING", 0x001f);
define("TNEF_MAPI_SYSTIME", 0x0040);
define("TNEF_MAPI_CLSID", 0x0048);
define("TNEF_MAPI_BINARY", 0x0102);
define("TNEF_MAPI_ATTACH_MIME_TAG", 0x370E);
define("TNEF_MAPI_ATTACH_LONG_FILENAME", 0x3707);
define("TNEF_MAPI_ATTACH_DATA", 0x3701);
function tnef_getx($size, &$buf)
{
$value = null;
if (strlen($buf) >= $size)
{
$value = substr($buf, 0, $size);
$buf = substr_replace($buf, '', 0, $size);
}
return $value;
}
function tnef_geti8(&$buf)
{
$value = null;
if (strlen($buf) >= 1)
{
$value = ord($buf{0});
$buf = substr_replace($buf, '', 0, 1);
}
return $value;
}
function tnef_geti16(&$buf)
{
$value = null;
if (strlen($buf) >= 2)
{
$value = ord($buf{0}) +
(ord($buf{1}) << 8);
$buf = substr_replace($buf, '', 0, 2);
}
return $value;
}
function tnef_geti32(&$buf)
{
$value = null;
if (strlen($buf) >= 4)
{
$value = ord($buf{0}) +
(ord($buf{1}) << 8) +
(ord($buf{2}) << 16) +
(ord($buf{3}) << 24);
$buf = substr_replace($buf, '', 0, 4);
}
return $value;
}
function tnef_decode_attribute($attribute, &$buf)
{
global $debug;
$length = tnef_geti32($buf);
$value = tnef_getx($length, $buf); //data
tnef_geti16($buf); //checksum
if ($debug)
{
printf("ATTRIBUTE[%08x] %d bytes\n", $attribute, $length);
}
switch($attribute)
{
case TNEF_BODYTEXT:
if ($debug)
{
printf("<b>Embedded message:</b><pre>%s</pre>", $value);
}
break;
default:
}
}
function extract_mapi_attrs($buf, &$attachment_data)
{
global $debug;
tnef_geti32($buf); // number of attributes
while(strlen($buf) > 0)
{
$value = null;
$length = 0;
$attr_type = tnef_geti16($buf);
$attr_name = tnef_geti16($buf);
if ($debug)
{
printf("mapi attribute: %04x:%04x\n", $attr_type, $attr_name);
}
switch($attr_type)
{
case TNEF_MAPI_SHORT:
$value = tnef_geti16($buf);
break;
case TNEF_MAPI_INT:
case TNEF_MAPI_BOOLEAN:
$value = tnef_geti32($buf);
break;
case TNEF_MAPI_FLOAT:
$value = tnef_getx(4, $buf);
break;
case TNEF_MAPI_DOUBLE:
case TNEF_MAPI_SYSTIME:
$value = tnef_getx(8, $buf);
break;
case TNEF_MAPI_STRING:
case TNEF_MAPI_UNICODE_STRING:
case TNEF_MAPI_BINARY:
case TNEF_MAPI_OBJECT:
$num_vals = tnef_geti32($buf);
for ($i = 0; $i < $num_vals; $i++) // usually just 1
{
$length = tnef_geti32($buf);
$buflen = $length + ((4 - ($length % 4)) % 4); // pad to next 4 byte boundary
$value = substr(tnef_getx($buflen, $buf), 0, $length); // read and truncate to length
}
break;
default:
if ($debug)
{
echo("Unknown mapi attribute!\n");
}
}
// store any interesting attributes
switch($attr_name)
{
case TNEF_MAPI_ATTACH_LONG_FILENAME: // used in preference to AFILENAME value
$attachment_data[0]['name'] = preg_replace('/.*[\/](.*)$/', '\1', $value); // strip path
break;
case TNEF_MAPI_ATTACH_MIME_TAG: // Is this ever set, and what is format?
$attachment_data[0]['type0'] = preg_replace('/^(.*)\/.*/', '\1', $value);
$attachment_data[0]['type1'] = preg_replace('/.*\/(.*)$/', '\1', $value);
break;
case TNEF_MAPI_ATTACH_DATA:
tnef_getx(16, $value); // skip the next 16 bytes (unknown data)
array_shift($attachment_data); // eliminate the current (bogus) attachment
do_tnef_decode($value, $attachment_data); // recursively process the attached message
break;
default:
}
}
}
function tnef_decode_message(&$buf)
{
global $debug;
if ($debug)
{
echo("MESSAGE ");
}
$attribute = tnef_geti32($buf);
tnef_decode_attribute($attribute, $buf);
}
function tnef_decode_attachment(&$buf, &$attachment_data)
{
global $debug;
if ($debug)
{
echo("ATTACHMENT ");
}
$attribute = tnef_geti32($buf);
switch($attribute)
{
case TNEF_ARENDDATA: // marks start of new attachment
$length = tnef_geti32($buf);
tnef_getx($length, $buf);
tnef_geti16($buf); //checksum
if ($debug)
{
printf("ARENDDATA[%08x]: %d bytes\n", $attribute, $length);
}
// add a new default data block to hold details of this attachment
// reverse order is easier to handle later!
array_unshift($attachment_data, array('type0' => 'application',
'type1' => 'octet-stream',
'name' => 'unknown',
'stream' => ''));
break;
case TNEF_AFILENAME: // filename
$length = tnef_geti32($buf);
$attachment_data[0]['name'] = preg_replace('/.*[\/](.*)$/',
'\1',
tnef_getx($length, $buf)); // strip path
tnef_geti16($buf); //checksum
if ($debug)
{
printf("AFILENAME[%08x]: %s\n", $attribute, $attachment_data[0]['name']);
}
break;
case TNEF_ATTACHDATA: // the attachment itself
$length = tnef_geti32($buf);
$attachment_data[0]['size'] = $length;
$attachment_data[0]['stream'] = tnef_getx($length, $buf);
tnef_geti16($buf); //checksum
if ($debug)
{
printf("ATTACHDATA[%08x]: %d bytes\n", $attribute, $length);
}
break;
case TNEF_AMAPIATTRS:
$length = tnef_geti32($buf);
$value = tnef_getx($length, $buf);
tnef_geti16($buf); //checksum
if ($debug)
{
printf("AMAPIATTRS[%08x]: %d bytes\n", $attribute, $length);
}
extract_mapi_attrs($value, $attachment_data);
break;
default:
tnef_decode_attribute($attribute, $buf);
}
}
function do_tnef_decode(&$buf, &$attachment_data)
{
global $debug;
$tnef_signature = tnef_geti32($buf);
if ($tnef_signature == TNEF_SIGNATURE)
{
$tnef_key = tnef_geti16($buf);
if ($debug)
{
printf("Signature: 0x%08x\nKey: 0x%04x\n", $tnef_signature, $tnef_key);
}
while (strlen($buf) > 0)
{
$lvl_type = tnef_geti8($buf);
switch($lvl_type)
{
case TNEF_LVL_MESSAGE:
tnef_decode_message($buf);
break;
case TNEF_LVL_ATTACHMENT:
tnef_decode_attachment($buf, $attachment_data);
break;
default:
if ($debug)
{
echo("Invalid file format!");
}
break 2;
}
}
}
else
{
if ($debug)
{
echo("Invalid file format!");
}
}
}
function tnef_decode($buf)
{
global $debug;
$attachment_data = array();
if ($debug)
{
echo("<pre>");
}
do_tnef_decode($buf, $attachment_data);
if ($debug)
{
echo("</pre>");
}
return array_reverse($attachment_data);
}
?>
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