<?php
/**********************************************************\
| |
| The implementation of PHPRPC Protocol 3.0 |
| |
| compat.php |
| |
| Release 3.0.1 |
| Copyright (c) 2005-2008 by Team-PHPRPC |
| |
| WebSite: http://www.phprpc.org/ |
| http://www.phprpc.net/ |
| http://www.phprpc.com/ |
| http://sourceforge.net/projects/php-rpc/ |
| |
| Authors: Ma Bingyao <andot@ujn.edu.cn> |
| |
| This file may be distributed and/or modified under the |
| terms of the GNU Lesser General Public License (LGPL) |
| version 3.0 as published by the Free Software Foundation |
| and appearing in the included file LICENSE. |
| |
\**********************************************************/
/* Provides missing functionality for older versions of PHP.
*
* Copyright (C) 2005-2008 Ma Bingyao <andot@ujn.edu.cn>
* Version: 1.2
* LastModified: May 1, 2007
* This library is free. You can redistribute it and/or modify it.
*/
require_once("phprpc_date.php");
if (!function_exists('file_get_contents')) {
function file_get_contents($filename, $incpath = false, $resource_context = null) {
if (false === $fh = fopen($filename, 'rb', $incpath)) {
user_error('file_get_contents() failed to open stream: No such file or directory',
E_USER_WARNING);
return false;
}
clearstatcache();
if ($fsize = @filesize($filename)) {
$data = fread($fh, $fsize);
}
else {
$data = '';
while (!feof($fh)) {
$data .= fread($fh, 8192);
}
}
fclose($fh);
return $data;
}
}
if (!function_exists('ob_get_clean')) {
function ob_get_clean() {
$contents = ob_get_contents();
if ($contents !== false) ob_end_clean();
return $contents;
}
}
function gzdecode($data) {
$len = strlen($data);
if ($len < 18 || strcmp(substr($data, 0, 2), "\x1f\x8b")) {
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
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
}
$extralen = unpack("v",substr($data, 8, 2));
$extralen = $extralen[1];
if ($len - $headerlen - 2 - $extralen < 8) {
return false; // 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
}
$filenamelen = strpos(substr($data, 8 + $extralen), chr(0));
if ($filenamelen === false || $len - $headerlen - $filenamelen - 1 < 8) {
return false; // 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
}
$commentlen = strpos(substr($data, 8 + $extralen + $filenamelen), chr(0));
if ($commentlen === false || $len - $headerlen - $commentlen - 1 < 8) {
return false; // Invalid header 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
}
$calccrc = crc32(substr($data, 0, $headerlen)) & 0xffff;
$headercrc = unpack("v", substr($data, $headerlen, 2));
$headercrc = $headercrc[1];
if ($headercrc != $calccrc) {
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!
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
return false;
}
}
else {
// I'm not sure if zero-byte body content is allowed.
// Allow it for now... Do nothing...
}
// 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!
return false;
}
return $data;
}
function declare_empty_class($classname) {
static $callback = null;
$classname = preg_replace('/[^a-zA-Z0-9\_]/', '', $classname);
if ($callback===null) {
$callback = $classname;
return;
}
if ($callback) {
call_user_func($callback, $classname);
}
if (!class_exists($classname)) {
eval('class ' . $classname . ' { }');
}
}
declare_empty_class(ini_get('unserialize_callback_func'));
ini_set('unserialize_callback_func', 'declare_empty_class');
?>
