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