<?php
function gzdecode($data) {
$len = strlen($data);
if ($len < 18 || strcmp(substr($data,0,2),"\x1f\x8b")) {
echo"FILE NOT GZIP FORMAT";
return null; // Not GZIP format (See RFC 1952)
}
$method = ord(substr($data,2,1)); // Compression method
$flags = ord(substr($data,3,1)); // Flags
if ($flags & 31 != $flags) {
// Reserved bits are set -- NOT ALLOWED by RFC 1952
echo"RESERVED BITS ARE SET. VERY BAD";
return null;
}
// NOTE: $mtime may be negative (PHP integer limitations)
$mtime = unpack("V", substr($data,4,4));
$mtime = $mtime[1];
$xfl = substr($data,8,1);
$os = substr($data,8,1);
$headerlen = 10;
$extralen = 0;
$extra ="";
if ($flags & 4) {
// 2-byte length prefixed EXTRA data in header
if ($len - $headerlen - 2 < 8) {
return false; // Invalid format
echo"INVALID FORMAT";
}
$extralen = unpack("v",substr($data,8,2));
$extralen = $extralen[1];
if ($len - $headerlen - 2 - $extralen < 8) {
return false; // Invalid format
echo"INVALID FORMAT";
}
$extra = substr($data,10,$extralen);
$headerlen += 2 + $extralen;
}
$filenamelen = 0;
$filename ="";
if ($flags & 8) {
// C-style string file NAME data in header
if ($len - $headerlen - 1 < 8) {
return false; // Invalid format
echo"INVALID FORMAT";
}
$filenamelen = strpos(substr($data,8+$extralen),chr(0));
if ($filenamelen === false || $len - $headerlen - $filenamelen - 1 < 8) {
return false; // Invalid format
echo"INVALID FORMAT";
}
$filename = substr($data,$headerlen,$filenamelen);
$headerlen += $filenamelen + 1;
}
$commentlen = 0;
$comment ="";
if ($flags & 16) {
// C-style string COMMENT data in header
if ($len - $headerlen - 1 < 8) {
return false; // Invalid format
echo"INVALID FORMAT";
}
$commentlen = strpos(substr($data,8+$extralen+$filenamelen),chr(0));
if ($commentlen === false || $len - $headerlen - $commentlen - 1 < 8) {
return false; // Invalid header format
echo"INVALID FORMAT";
}
$comment = substr($data,$headerlen,$commentlen);
$headerlen += $commentlen + 1;
}
$headercrc ="";
if ($flags & 1) {
// 2-bytes (lowest order) of CRC32 on header present
if ($len - $headerlen - 2 < 8) {
return false; // Invalid format
echo"INVALID FORMAT";
}
$calccrc = crc32(substr($data,0,$headerlen)) & 0xffff;
$headercrc = unpack("v", substr($data,$headerlen,2));
$headercrc = $headercrc[1];
if ($headercrc != $calccrc) {
echo"BAD CRC";
return false; // Bad header CRC
}
$headerlen += 2;
}
// GZIP FOOTER - These be negative due to PHP's limitations
$datacrc = unpack("V",substr($data,-8,4));
$datacrc = $datacrc[1];
$isize = unpack("V",substr($data,-4));
$isize = $isize[1];
// Perform the decompression:
$bodylen = $len-$headerlen-8;
if ($bodylen < 1) {
// This should never happen - IMPLEMENTATION BUG!
echo"BIG OOPS";
return null;
}
$body = substr($data,$headerlen,$bodylen);
$data ="";
if ($bodylen > 0) {
switch ($method) {
case 8:
// Currently the only supported compression method:
$data = gzinflate($body);
break;
default:
// Unknown compression method
echo"UNKNOWN COMPRESSION METHOD";
return false;
}
} else {
// I'm not sure if zero-byte body content is allowed.
// Allow it for now... Do nothing...
echo"ITS EMPTY";
}
// Verifiy decompressed size and CRC32:
// NOTE: This may fail with large data sizes depending on how
// PHP's integer limitations affect strlen() since $isize
// may be negative for large sizes.
if ($isize != strlen($data) || crc32($data) != $datacrc) {
// Bad format! Length or CRC doesn't match!
echo"LENGTH OR CRC DO NOT MATCH";
return false;
}
return $data;
}
echo"<html><head></head><body>";
if (empty($_REQUEST['upload'])) {
echo <<<_END
<form enctype="multipart/form-data" action="example.php" method="POST">
<input type="hidden" name="MAX_FILE_SIZE" value="100000" />
<table>
<th>
<input name="uploadedfile" type="file" />
</th>
<tr>
<td><input type="submit" name="upload" value="Convert File" /></td>
</tr>
</table>
</form>
_END;
}
if (!empty($_REQUEST['upload'])) {
$file ="tmp/" . $_FILES['uploadedfile']['name'];
$orgfile = $_FILES['uploadedfile']['name'];
$name = str_replace(".xfdl","", $orgfile);
$convertedfile ="tmp/" . $name .".xml";
$compressedfile ="tmp/" . $name .".gz";
$finalfile ="tmp/" . $name ."new.xfdl";
$target_path ="tmp/";
$target_path = $target_path . basename($_FILES['uploadedfile']['name']);
if (move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {
} else {
echo"There was an error uploading the file, please try again!";
}
$firstline ="application/vnd.xfdl; content-encoding="base64-gzip"
";
$data = file($file);
$data = array_slice($data, 1);
$raw = implode($data);
$decoded = base64_decode($raw);
$decompressed = gzdecode($decoded);
$compressed = gzencode($decompressed);
$encoded = base64_encode($compressed);
$decoded2 = base64_decode($encoded);
$decompressed2 = gzdecode($decoded2);
$header = bin2hex(substr($decoded, 0, 10));
$tail = bin2hex(substr($decoded, -8));
$header2 = bin2hex(substr($compressed, 0, 10));
$tail2 = bin2hex(substr($compressed, -8));
$header3 = bin2hex(substr($decoded2, 0, 10));
$tail3 = bin2hex(substr($decoded2, -8));
$filehandle = fopen($compressedfile, 'w');
fwrite($filehandle, $decoded);
fclose($filehandle);
$filehandle = fopen($convertedfile, 'w');
fwrite($filehandle, $decompressed);
fclose($filehandle);
$filehandle = fopen($finalfile, 'w');
fwrite($filehandle, $firstline);
fwrite($filehandle, $encoded);
fclose($filehandle);
echo"<center>";
echo"<table style='text-align:center' >";
echo"<tr><th>Stage 1</th>";
echo"<th>Stage 2</th>";
echo"<th>Stage 3</th></tr>";
echo"<tr><td>RAW DATA -></td><td>DECODED DATA -></td><td>UNCOMPRESSED DATA -></td></tr>";
echo"<tr><td>LENGTH:".strlen($raw)."</td>";
echo"<td>LENGTH:".strlen($decoded)."</td>";
echo"<td>LENGTH:".strlen($decompressed)."</td></tr>";
echo"<tr><td>ORIGINAL</td><td>GZIP HEADER:".$header."</td><td>XML CONVERTED</td></tr>";
echo"<tr><td></td><td>GZIP TAIL:".$tail."</td><td></td></tr>";
echo"<tr><td><textarea cols='30' rows='20'>" . $raw ."</textarea></td>";
echo"<td><textarea cols='30' rows='20'>" . $decoded ."</textarea></td>";
echo"<td><textarea cols='30' rows='20'>" . $decompressed ."</textarea></td></tr>";
echo"<tr><th>Stage 6</th>";
echo"<th>Stage 5</th>";
echo"<th>Stage 4</th></tr>";
echo"<tr><td>ENCODED DATA <-</td><td>COMPRESSED DATA <-</td><td>UNCOMPRESSED DATA <-</td></tr>";
echo"<tr><td>LENGTH:".strlen($encoded)."</td>";
echo"<td>LENGTH:".strlen($compressed)."</td>";
echo"<td>LENGTH:".strlen($decompressed)."</td></tr>";
echo"<tr><td></td><td>GZIP HEADER:".$header2."</td><td></td></tr>";
echo"<tr><td></td><td>GZIP TAIL:".$tail2."</td><td></td></tr>";
echo"<tr><td>FINAL FILE</td><td>RE-COMPRESSED FILE</td><td></td></tr>";
echo"<tr><td><textarea cols='30' rows='20'>" . $encoded ."</textarea></td>";
echo"<td><textarea cols='30' rows='20'>" . $compressed ."</textarea></td>";
echo"<td><textarea cols='30' rows='20'>" . $decompressed ."</textarea></td></tr>";
echo"</table>";
echo"</center>";
}
echo"</body></html>";
?>
