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-rw-r--r--program/lib/tnef_decoder.inc352
1 files changed, 352 insertions, 0 deletions
diff --git a/program/lib/tnef_decoder.inc b/program/lib/tnef_decoder.inc
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index 000000000..f9b7c3684
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+++ b/program/lib/tnef_decoder.inc
@@ -0,0 +1,352 @@
+<?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, $download;
+
+ $length = tnef_geti32($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 (!$download)
+ {
+ printf("<b>Embedded message:</b><pre>%s</pre>",$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
+ $attachment_data[0]['name'] = ereg_replace('.*[\/](.*)$', '\1', $value); // strip path
+ break;
+
+ case TNEF_MAPI_ATTACH_MIME_TAG: // Is this ever set, and what is format?
+ $attachment_data[0]['type0'] = ereg_replace('^(.*)/.*', '\1', $value);
+ $attachment_data[0]['type1'] = ereg_replace('.*/(.*)$', '\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);
+ $attachment_data[0]['name'] = ereg_replace('.*[\/](.*)$',
+ '\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);
+
+}
+
+?> \ No newline at end of file
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