From 42c80841c846610be280218d53fcde06b0f0063b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicolas=20L=C5=93uillet?= Date: Fri, 6 Dec 2013 09:45:27 +0100 Subject: [change] we now use Full-Text RSS 3.1, thank you so much @fivefilters --- .../humble-http-agent/HumbleHttpAgent.php | 779 +++++++++++++++++++++ 1 file changed, 779 insertions(+) create mode 100644 inc/3rdparty/libraries/humble-http-agent/HumbleHttpAgent.php (limited to 'inc/3rdparty/libraries/humble-http-agent/HumbleHttpAgent.php') diff --git a/inc/3rdparty/libraries/humble-http-agent/HumbleHttpAgent.php b/inc/3rdparty/libraries/humble-http-agent/HumbleHttpAgent.php new file mode 100644 index 00000000..e4f1b3b3 --- /dev/null +++ b/inc/3rdparty/libraries/humble-http-agent/HumbleHttpAgent.php @@ -0,0 +1,779 @@ +userAgentDefault = self::UA_BROWSER; + $this->referer = self::REF_GOOGLE; + // set the request method + if (in_array($method, array(1,2,4))) { + $this->method = $method; + } else { + if (class_exists('HttpRequestPool')) { + $this->method = self::METHOD_REQUEST_POOL; + } elseif (function_exists('curl_multi_init')) { + $this->method = self::METHOD_CURL_MULTI; + } else { + $this->method = self::METHOD_FILE_GET_CONTENTS; + } + } + if ($this->method == self::METHOD_CURL_MULTI) { + require_once(dirname(__FILE__).'/RollingCurl.php'); + } + // create cookie jar + $this->cookieJar = new CookieJar(); + // set request options (redirect must be 0) + $this->requestOptions = array( + 'timeout' => 15, + 'redirect' => 0 // we handle redirects manually so we can rewrite the new hashbang URLs that are creeping up over the web + // TODO: test onprogress? + ); + if (is_array($requestOptions)) { + $this->requestOptions = array_merge($this->requestOptions, $requestOptions); + } + $this->httpContext = array( + 'http' => array( + 'ignore_errors' => true, + 'timeout' => $this->requestOptions['timeout'], + 'max_redirects' => $this->requestOptions['redirect'], + 'header' => "Accept: */*\r\n" + ) + ); + } + + protected function debug($msg) { + if ($this->debug) { + $mem = round(memory_get_usage()/1024, 2); + $memPeak = round(memory_get_peak_usage()/1024, 2); + echo '* ',$msg; + if ($this->debugVerbose) echo ' - mem used: ',$mem," (peak: $memPeak)"; + echo "\n"; + ob_flush(); + flush(); + } + } + + protected function getUserAgent($url, $asArray=false) { + $host = @parse_url($url, PHP_URL_HOST); + if (strtolower(substr($host, 0, 4)) == 'www.') { + $host = substr($host, 4); + } + if ($host) { + $try = array($host); + $split = explode('.', $host); + if (count($split) > 1) { + array_shift($split); + $try[] = '.'.implode('.', $split); + } + foreach ($try as $h) { + if (isset($this->userAgentMap[$h])) { + $ua = $this->userAgentMap[$h]; + break; + } + } + } + if (!isset($ua)) $ua = $this->userAgentDefault; + if ($asArray) { + return array('User-Agent' => $ua); + } else { + return 'User-Agent: '.$ua; + } + } + + public function rewriteHashbangFragment($url) { + // return $url if there's no '#!' + if (strpos($url, '#!') === false) return $url; + // split $url and rewrite + // TODO: is SimplePie_IRI included? + $iri = new SimplePie_IRI($url); + $fragment = substr($iri->fragment, 1); // strip '!' + $iri->fragment = null; + if (isset($iri->query)) { + parse_str($iri->query, $query); + } else { + $query = array(); + } + $query['_escaped_fragment_'] = (string)$fragment; + $iri->query = str_replace('%2F', '/', http_build_query($query)); // needed for some sites + return $iri->get_iri(); + } + + public function getUglyURL($url, $html) { + if ($html == '') return false; + $found = false; + foreach ($this->ajaxTriggers as $string) { + if (stripos($html, $string)) { + $found = true; + break; + } + } + if (!$found) return false; + $iri = new SimplePie_IRI($url); + if (isset($iri->query)) { + parse_str($iri->query, $query); + } else { + $query = array(); + } + $query['_escaped_fragment_'] = ''; + $iri->query = str_replace('%2F', '/', http_build_query($query)); // needed for some sites + return $iri->get_iri(); + } + + public function removeFragment($url) { + $pos = strpos($url, '#'); + if ($pos === false) { + return $url; + } else { + return substr($url, 0, $pos); + } + } + + public function rewriteUrls($url) { + foreach ($this->rewriteUrls as $find => $action) { + if (strpos($url, $find) !== false) { + if (is_array($action)) { + return strtr($url, $action); + } + } + } + return $url; + } + + public function enableDebug($bool=true) { + $this->debug = (bool)$bool; + } + + public function minimiseMemoryUse($bool = true) { + $this->minimiseMemoryUse = $bool; + } + + public function setMaxParallelRequests($max) { + $this->maxParallelRequests = $max; + } + + public function validateUrl($url) { + $url = filter_var($url, FILTER_SANITIZE_URL); + $test = filter_var($url, FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED); + // deal with bug http://bugs.php.net/51192 (present in PHP 5.2.13 and PHP 5.3.2) + if ($test === false) { + $test = filter_var(strtr($url, '-', '_'), FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED); + } + if ($test !== false && $test !== null && preg_match('!^https?://!', $url)) { + return $url; + } else { + return false; + } + } + + public function fetchAll(array $urls) { + $this->fetchAllOnce($urls, $isRedirect=false); + $redirects = 0; + while (!empty($this->redirectQueue) && ++$redirects <= $this->maxRedirects) { + $this->debug("Following redirects #$redirects..."); + $this->fetchAllOnce($this->redirectQueue, $isRedirect=true); + } + } + + // fetch all URLs without following redirects + public function fetchAllOnce(array $urls, $isRedirect=false) { + if (!$isRedirect) $urls = array_unique($urls); + if (empty($urls)) return; + + ////////////////////////////////////////////////////// + // parallel (HttpRequestPool) + if ($this->method == self::METHOD_REQUEST_POOL) { + $this->debug('Starting parallel fetch (HttpRequestPool)'); + try { + while (count($urls) > 0) { + $this->debug('Processing set of '.min($this->maxParallelRequests, count($urls))); + $subset = array_splice($urls, 0, $this->maxParallelRequests); + $pool = new HttpRequestPool(); + foreach ($subset as $orig => $url) { + if (!$isRedirect) $orig = $url; + unset($this->redirectQueue[$orig]); + $this->debug("...$url"); + if (!$isRedirect && isset($this->requests[$url])) { + $this->debug("......in memory"); + /* + } elseif ($this->isCached($url)) { + $this->debug("......is cached"); + if (!$this->minimiseMemoryUse) { + $this->requests[$url] = $this->getCached($url); + } + */ + } else { + $this->debug("......adding to pool"); + $req_url = $this->rewriteUrls($url); + $req_url = ($this->rewriteHashbangFragment) ? $this->rewriteHashbangFragment($req_url) : $req_url; + $req_url = $this->removeFragment($req_url); + if (!empty($this->headerOnlyTypes) && !isset($this->requests[$orig]['wrongGuess']) && $this->possibleUnsupportedType($req_url)) { + $_meth = HttpRequest::METH_HEAD; + } else { + $_meth = HttpRequest::METH_GET; + unset($this->requests[$orig]['wrongGuess']); + } + $httpRequest = new HttpRequest($req_url, $_meth, $this->requestOptions); + // send cookies, if we have any + if ($cookies = $this->cookieJar->getMatchingCookies($req_url)) { + $this->debug("......sending cookies: $cookies"); + $httpRequest->addHeaders(array('Cookie' => $cookies)); + } + //$httpRequest->addHeaders(array('User-Agent' => $this->userAgent)); + $httpRequest->addHeaders($this->getUserAgent($req_url, true)); + // add referer for picky sites + $httpRequest->addheaders(array('Referer' => $this->referer)); + $this->requests[$orig] = array('headers'=>null, 'body'=>null, 'httpRequest'=>$httpRequest); + $this->requests[$orig]['original_url'] = $orig; + $pool->attach($httpRequest); + } + } + // did we get anything into the pool? + if (count($pool) > 0) { + $this->debug('Sending request...'); + try { + $pool->send(); + } catch (HttpRequestPoolException $e) { + // do nothing + } + $this->debug('Received responses'); + foreach($subset as $orig => $url) { + if (!$isRedirect) $orig = $url; + $request = $this->requests[$orig]['httpRequest']; + //$this->requests[$orig]['headers'] = $this->headersToString($request->getResponseHeader()); + // getResponseHeader() doesn't return status line, so, for consistency... + $this->requests[$orig]['headers'] = substr($request->getRawResponseMessage(), 0, $request->getResponseInfo('header_size')); + // check content type + // TODO: use getResponseHeader('content-type') or getResponseInfo() + if ($this->headerOnlyType($this->requests[$orig]['headers'])) { + $this->requests[$orig]['body'] = ''; + $_header_only_type = true; + $this->debug('Header only type returned'); + } else { + $this->requests[$orig]['body'] = $request->getResponseBody(); + $_header_only_type = false; + } + $this->requests[$orig]['effective_url'] = $request->getResponseInfo('effective_url'); + $this->requests[$orig]['status_code'] = $status_code = $request->getResponseCode(); + // is redirect? + if ((in_array($status_code, array(300, 301, 302, 303, 307)) || $status_code > 307 && $status_code < 400) && $request->getResponseHeader('location')) { + $redirectURL = $request->getResponseHeader('location'); + if (!preg_match('!^https?://!i', $redirectURL)) { + $redirectURL = SimplePie_Misc::absolutize_url($redirectURL, $url); + } + if ($this->validateURL($redirectURL)) { + $this->debug('Redirect detected. Valid URL: '.$redirectURL); + // store any cookies + $cookies = $request->getResponseHeader('set-cookie'); + if ($cookies && !is_array($cookies)) $cookies = array($cookies); + if ($cookies) $this->cookieJar->storeCookies($url, $cookies); + $this->redirectQueue[$orig] = $redirectURL; + } else { + $this->debug('Redirect detected. Invalid URL: '.$redirectURL); + } + } elseif (!$_header_only_type && $request->getMethod() === HttpRequest::METH_HEAD) { + // the response content-type did not match our 'header only' types, + // but we'd issues a HEAD request because we assumed it would. So + // let's queue a proper GET request for this item... + $this->debug('Wrong guess at content-type, queing GET request'); + $this->requests[$orig]['wrongGuess'] = true; + $this->redirectQueue[$orig] = $this->requests[$orig]['effective_url']; + } elseif (strpos($this->requests[$orig]['effective_url'], '_escaped_fragment_') === false) { + // check for + // for AJAX sites, e.g. Blogger with its dynamic views templates. + // Based on Google's spec: https://developers.google.com/webmasters/ajax-crawling/docs/specification + if (isset($this->requests[$orig]['body'])) { + $redirectURL = $this->getUglyURL($this->requests[$orig]['effective_url'], substr($this->requests[$orig]['body'], 0, 4000)); + if ($redirectURL) { + $this->debug('AJAX trigger (meta name="fragment" content="!") found. Queueing '.$redirectURL); + $this->redirectQueue[$orig] = $redirectURL; + } + } + } + //die($url.' -multi- '.$request->getResponseInfo('effective_url')); + $pool->detach($request); + unset($this->requests[$orig]['httpRequest'], $request); + /* + if ($this->minimiseMemoryUse) { + if ($this->cache($url)) { + unset($this->requests[$url]); + } + } + */ + } + } + } + } catch (HttpException $e) { + $this->debug($e); + return false; + } + } + + ////////////////////////////////////////////////////////// + // parallel (curl_multi_*) + elseif ($this->method == self::METHOD_CURL_MULTI) { + $this->debug('Starting parallel fetch (curl_multi_*)'); + while (count($urls) > 0) { + $this->debug('Processing set of '.min($this->maxParallelRequests, count($urls))); + $subset = array_splice($urls, 0, $this->maxParallelRequests); + $pool = new RollingCurl(array($this, 'handleCurlResponse')); + $pool->window_size = count($subset); + + foreach ($subset as $orig => $url) { + if (!$isRedirect) $orig = $url; + unset($this->redirectQueue[$orig]); + $this->debug("...$url"); + if (!$isRedirect && isset($this->requests[$url])) { + $this->debug("......in memory"); + /* + } elseif ($this->isCached($url)) { + $this->debug("......is cached"); + if (!$this->minimiseMemoryUse) { + $this->requests[$url] = $this->getCached($url); + } + */ + } else { + $this->debug("......adding to pool"); + $req_url = $this->rewriteUrls($url); + $req_url = ($this->rewriteHashbangFragment) ? $this->rewriteHashbangFragment($req_url) : $req_url; + $req_url = $this->removeFragment($req_url); + if (!empty($this->headerOnlyTypes) && !isset($this->requests[$orig]['wrongGuess']) && $this->possibleUnsupportedType($req_url)) { + $_meth = 'HEAD'; + } else { + $_meth = 'GET'; + unset($this->requests[$orig]['wrongGuess']); + } + $headers = array(); + //$headers[] = 'User-Agent: '.$this->userAgent; + $headers[] = $this->getUserAgent($req_url); + // add referer for picky sites + $headers[] = 'Referer: '.$this->referer; + // send cookies, if we have any + if ($cookies = $this->cookieJar->getMatchingCookies($req_url)) { + $this->debug("......sending cookies: $cookies"); + $headers[] = 'Cookie: '.$cookies; + } + $httpRequest = new RollingCurlRequest($req_url, $_meth, null, $headers, array( + CURLOPT_CONNECTTIMEOUT => $this->requestOptions['timeout'], + CURLOPT_TIMEOUT => $this->requestOptions['timeout'] + )); + $httpRequest->set_original_url($orig); + $this->requests[$orig] = array('headers'=>null, 'body'=>null, 'httpRequest'=>$httpRequest); + $this->requests[$orig]['original_url'] = $orig; // TODO: is this needed anymore? + $pool->add($httpRequest); + } + } + // did we get anything into the pool? + if (count($pool) > 0) { + $this->debug('Sending request...'); + $pool->execute(); // this will call handleCurlResponse() and populate $this->requests[$orig] + $this->debug('Received responses'); + foreach($subset as $orig => $url) { + if (!$isRedirect) $orig = $url; + // $this->requests[$orig]['headers'] + // $this->requests[$orig]['body'] + // $this->requests[$orig]['effective_url'] + // check content type + if ($this->headerOnlyType($this->requests[$orig]['headers'])) { + $this->requests[$orig]['body'] = ''; + $_header_only_type = true; + $this->debug('Header only type returned'); + } else { + $_header_only_type = false; + } + $status_code = $this->requests[$orig]['status_code']; + if ((in_array($status_code, array(300, 301, 302, 303, 307)) || $status_code > 307 && $status_code < 400) && isset($this->requests[$orig]['location'])) { + $redirectURL = $this->requests[$orig]['location']; + if (!preg_match('!^https?://!i', $redirectURL)) { + $redirectURL = SimplePie_Misc::absolutize_url($redirectURL, $url); + } + if ($this->validateURL($redirectURL)) { + $this->debug('Redirect detected. Valid URL: '.$redirectURL); + // store any cookies + $cookies = $this->cookieJar->extractCookies($this->requests[$orig]['headers']); + if (!empty($cookies)) $this->cookieJar->storeCookies($url, $cookies); + $this->redirectQueue[$orig] = $redirectURL; + } else { + $this->debug('Redirect detected. Invalid URL: '.$redirectURL); + } + } elseif (!$_header_only_type && $this->requests[$orig]['method'] == 'HEAD') { + // the response content-type did not match our 'header only' types, + // but we'd issues a HEAD request because we assumed it would. So + // let's queue a proper GET request for this item... + $this->debug('Wrong guess at content-type, queing GET request'); + $this->requests[$orig]['wrongGuess'] = true; + $this->redirectQueue[$orig] = $this->requests[$orig]['effective_url']; + } elseif (strpos($this->requests[$orig]['effective_url'], '_escaped_fragment_') === false) { + // check for + // for AJAX sites, e.g. Blogger with its dynamic views templates. + // Based on Google's spec: https://developers.google.com/webmasters/ajax-crawling/docs/specification + if (isset($this->requests[$orig]['body'])) { + $redirectURL = $this->getUglyURL($this->requests[$orig]['effective_url'], substr($this->requests[$orig]['body'], 0, 4000)); + if ($redirectURL) { + $this->debug('AJAX trigger (meta name="fragment" content="!") found. Queueing '.$redirectURL); + $this->redirectQueue[$orig] = $redirectURL; + } + } + } + // die($url.' -multi- '.$request->getResponseInfo('effective_url')); + unset($this->requests[$orig]['httpRequest'], $this->requests[$orig]['method']); + } + } + } + } + + ////////////////////////////////////////////////////// + // sequential (file_get_contents) + else { + $this->debug('Starting sequential fetch (file_get_contents)'); + $this->debug('Processing set of '.count($urls)); + foreach ($urls as $orig => $url) { + if (!$isRedirect) $orig = $url; + unset($this->redirectQueue[$orig]); + $this->debug("...$url"); + if (!$isRedirect && isset($this->requests[$url])) { + $this->debug("......in memory"); + /* + } elseif ($this->isCached($url)) { + $this->debug("......is cached"); + if (!$this->minimiseMemoryUse) { + $this->requests[$url] = $this->getCached($url); + } + */ + } else { + $this->debug("Sending request for $url"); + $this->requests[$orig]['original_url'] = $orig; + $req_url = $this->rewriteUrls($url); + $req_url = ($this->rewriteHashbangFragment) ? $this->rewriteHashbangFragment($req_url) : $req_url; + $req_url = $this->removeFragment($req_url); + // send cookies, if we have any + $httpContext = $this->httpContext; + $httpContext['http']['header'] .= $this->getUserAgent($req_url)."\r\n"; + // add referer for picky sites + $httpContext['http']['header'] .= 'Referer: '.$this->referer."\r\n"; + if ($cookies = $this->cookieJar->getMatchingCookies($req_url)) { + $this->debug("......sending cookies: $cookies"); + $httpContext['http']['header'] .= 'Cookie: '.$cookies."\r\n"; + } + if (false !== ($html = @file_get_contents($req_url, false, stream_context_create($httpContext)))) { + $this->debug('Received response'); + // get status code + if (!isset($http_response_header[0]) || !preg_match('!^HTTP/\d+\.\d+\s+(\d+)!', trim($http_response_header[0]), $match)) { + $this->debug('Error: no status code found'); + // TODO: handle error - no status code + } else { + $this->requests[$orig]['headers'] = $this->headersToString($http_response_header, false); + // check content type + if ($this->headerOnlyType($this->requests[$orig]['headers'])) { + $this->requests[$orig]['body'] = ''; + } else { + $this->requests[$orig]['body'] = $html; + } + $this->requests[$orig]['effective_url'] = $req_url; + $this->requests[$orig]['status_code'] = $status_code = (int)$match[1]; + unset($match); + // handle redirect + if (preg_match('/^Location:(.*?)$/mi', $this->requests[$orig]['headers'], $match)) { + $this->requests[$orig]['location'] = trim($match[1]); + } + if ((in_array($status_code, array(300, 301, 302, 303, 307)) || $status_code > 307 && $status_code < 400) && isset($this->requests[$orig]['location'])) { + $redirectURL = $this->requests[$orig]['location']; + if (!preg_match('!^https?://!i', $redirectURL)) { + $redirectURL = SimplePie_Misc::absolutize_url($redirectURL, $url); + } + if ($this->validateURL($redirectURL)) { + $this->debug('Redirect detected. Valid URL: '.$redirectURL); + // store any cookies + $cookies = $this->cookieJar->extractCookies($this->requests[$orig]['headers']); + if (!empty($cookies)) $this->cookieJar->storeCookies($url, $cookies); + $this->redirectQueue[$orig] = $redirectURL; + } else { + $this->debug('Redirect detected. Invalid URL: '.$redirectURL); + } + } elseif (strpos($this->requests[$orig]['effective_url'], '_escaped_fragment_') === false) { + // check for + // for AJAX sites, e.g. Blogger with its dynamic views templates. + // Based on Google's spec: https://developers.google.com/webmasters/ajax-crawling/docs/specification + if (isset($this->requests[$orig]['body'])) { + $redirectURL = $this->getUglyURL($this->requests[$orig]['effective_url'], substr($this->requests[$orig]['body'], 0, 4000)); + if ($redirectURL) { + $this->debug('AJAX trigger (meta name="fragment" content="!") found. Queueing '.$redirectURL); + $this->redirectQueue[$orig] = $redirectURL; + } + } + } + } + } else { + $this->debug('Error retrieving URL'); + //print_r($req_url); + //print_r($http_response_header); + //print_r($html); + + // TODO: handle error - failed to retrieve URL + } + } + } + } + } + + public function handleCurlResponse($response, $info, $request) { + $orig = $request->url_original; + $this->requests[$orig]['headers'] = substr($response, 0, $info['header_size']); + $this->requests[$orig]['body'] = substr($response, $info['header_size']); + $this->requests[$orig]['method'] = $request->method; + $this->requests[$orig]['effective_url'] = $info['url']; + $this->requests[$orig]['status_code'] = (int)$info['http_code']; + if (preg_match('/^Location:(.*?)$/mi', $this->requests[$orig]['headers'], $match)) { + $this->requests[$orig]['location'] = trim($match[1]); + } + } + + protected function headersToString(array $headers, $associative=true) { + if (!$associative) { + return implode("\n", $headers); + } else { + $str = ''; + foreach ($headers as $key => $val) { + if (is_array($val)) { + foreach ($val as $v) $str .= "$key: $v\n"; + } else { + $str .= "$key: $val\n"; + } + } + return rtrim($str); + } + } + + public function get($url, $remove=false, $gzdecode=true) { + $url = "$url"; + if (isset($this->requests[$url]) && isset($this->requests[$url]['body'])) { + $this->debug("URL already fetched - in memory ($url, effective: {$this->requests[$url]['effective_url']})"); + $response = $this->requests[$url]; + /* + } elseif ($this->isCached($url)) { + $this->debug("URL already fetched - in disk cache ($url)"); + $response = $this->getCached($url); + $this->requests[$url] = $response; + */ + } else { + $this->debug("Fetching URL ($url)"); + $this->fetchAll(array($url)); + if (isset($this->requests[$url]) && isset($this->requests[$url]['body'])) { + $response = $this->requests[$url]; + } else { + $this->debug("Request failed"); + $response = false; + } + } + /* + if ($this->minimiseMemoryUse && $response) { + $this->cache($url); + unset($this->requests[$url]); + } + */ + if ($remove && $response) unset($this->requests[$url]); + if ($gzdecode && stripos($response['headers'], 'Content-Encoding: gzip')) { + if ($html = gzdecode($response['body'])) { + $response['body'] = $html; + } + } + return $response; + } + + public function parallelSupport() { + return class_exists('HttpRequestPool') || function_exists('curl_multi_init'); + } + + private function headerOnlyType($headers) { + if (preg_match('!^Content-Type:\s*(([a-z-]+)/([^;\r\n ]+))!im', $headers, $match)) { + // look for full mime type (e.g. image/jpeg) or just type (e.g. image) + $match[1] = strtolower(trim($match[1])); + $match[2] = strtolower(trim($match[2])); + foreach (array($match[1], $match[2]) as $mime) { + if (in_array($mime, $this->headerOnlyTypes)) return true; + } + } + return false; + } + + private function possibleUnsupportedType($url) { + $path = @parse_url($url, PHP_URL_PATH); + if ($path && strpos($path, '.') !== false) { + $ext = strtolower(trim(pathinfo($path, PATHINFO_EXTENSION))); + return in_array($ext, $this->headerOnlyClues); + } + return false; + } +} + +// gzdecode from http://www.php.net/manual/en/function.gzdecode.php#82930 +if (!function_exists('gzdecode')) { + function gzdecode($data,&$filename='',&$error='',$maxlength=null) + { + $len = strlen($data); + if ($len < 18 || strcmp(substr($data,0,2),"\x1f\x8b")) { + $error = "Not in 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) { + $error = "Reserved bits not allowed."; + 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 + } + $extralen = unpack("v",substr($data,8,2)); + $extralen = $extralen[1]; + if ($len - $headerlen - 2 - $extralen < 8) { + return false; // invalid + } + $extra = substr($data,10,$extralen); + $headerlen += 2 + $extralen; + } + $filenamelen = 0; + $filename = ""; + if ($flags & 8) { + // C-style string + if ($len - $headerlen - 1 < 8) { + return false; // invalid + } + $filenamelen = strpos(substr($data,$headerlen),chr(0)); + if ($filenamelen === false || $len - $headerlen - $filenamelen - 1 < 8) { + return false; // invalid + } + $filename = substr($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 + } + $commentlen = strpos(substr($data,$headerlen),chr(0)); + if ($commentlen === false || $len - $headerlen - $commentlen - 1 < 8) { + return false; // Invalid header format + } + $comment = substr($data,$headerlen,$commentlen); + $headerlen += $commentlen + 1; + } + $headercrc = ""; + if ($flags & 2) { + // 2-bytes (lowest order) of CRC32 on header present + if ($len - $headerlen - 2 < 8) { + return false; // invalid + } + $calccrc = crc32(substr($data,0,$headerlen)) & 0xffff; + $headercrc = unpack("v", substr($data,$headerlen,2)); + $headercrc = $headercrc[1]; + if ($headercrc != $calccrc) { + $error = "Header checksum failed."; + return false; // Bad header CRC + } + $headerlen += 2; + } + // GZIP FOOTER + $datacrc = unpack("V",substr($data,-8,4)); + $datacrc = sprintf('%u',$datacrc[1] & 0xFFFFFFFF); + $isize = unpack("V",substr($data,-4)); + $isize = $isize[1]; + // decompression: + $bodylen = $len-$headerlen-8; + if ($bodylen < 1) { + // 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,$maxlength); + break; + default: + $error = "Unknown compression method."; + return false; + } + } // zero-byte body content is allowed + // Verifiy CRC32 + $crc = sprintf("%u",crc32($data)); + $crcOK = $crc == $datacrc; + $lenOK = $isize == strlen($data); + if (!$lenOK || !$crcOK) { + $error = ( $lenOK ? '' : 'Length check FAILED. ') . ( $crcOK ? '' : 'Checksum FAILED.'); + return false; + } + return $data; + } +} +?> \ No newline at end of file -- cgit v1.2.3