+++ /dev/null
-<?php
-/**
- * Humble HTTP Agent
- *
- * This class is designed to take advantage of parallel HTTP requests
- * offered by PHP's PECL HTTP extension or the curl_multi_* functions.
- * For environments which do not have these options, it reverts to standard sequential
- * requests (using file_get_contents())
- *
- * @version 1.0
- * @date 2012-02-09
- * @see http://php.net/HttpRequestPool
- * @author Keyvan Minoukadeh
- * @copyright 2011-2012 Keyvan Minoukadeh
- * @license http://www.gnu.org/licenses/agpl-3.0.html AGPL v3
- */
-
-class HumbleHttpAgent
-{
- const METHOD_REQUEST_POOL = 1;
- const METHOD_CURL_MULTI = 2;
- const METHOD_FILE_GET_CONTENTS = 4;
- //const UA_BROWSER = 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1';
- const UA_BROWSER = 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.92 Safari/535.2';
- const UA_PHP = 'PHP/5.2';
- const REF_GOOGLE = 'http://www.google.co.uk/url?sa=t&source=web&cd=1';
-
- protected $requests = array();
- protected $redirectQueue = array();
- protected $requestOptions;
- protected $maxParallelRequests = 5;
- protected $cache = null; //TODO
- protected $httpContext;
- protected $minimiseMemoryUse = false; //TODO
- protected $debug = false;
- protected $method;
- protected $cookieJar;
- public $rewriteHashbangFragment = true; // see http://code.google.com/web/ajaxcrawling/docs/specification.html
- public $maxRedirects = 5;
- public $userAgentMap = array();
- public $rewriteUrls = array();
- public $userAgentDefault;
- public $referer;
- //public $userAgent = 'Mozilla/5.0';
-
- // Prevent certain file/mime types
- // HTTP responses which match these content types will
- // be returned without body.
- public $headerOnlyTypes = array();
- // URLs ending with one of these extensions will
- // prompt Humble HTTP Agent to send a HEAD request first
- // to see if returned content type matches $headerOnlyTypes.
- public $headerOnlyClues = array('pdf','mp3','zip','exe','gif','gzip','gz','jpeg','jpg','mpg','mpeg','png','ppt','mov');
-
- //TODO: set max file size
- //TODO: normalise headers
-
- function __construct($requestOptions=null, $method=null) {
- $this->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;
- echo ' - mem used: ',$mem," (peak: $memPeak)\n";
- ob_flush();
- flush();
- }
- }
-
- protected function getUserAgent($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 $iri->get_iri();
- }
-
- public function removeFragment($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'];
- }
- //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'];
- }
- // 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($match);
- // handle redirect
- if (preg_match('/^Location:(.*?)$/m', $this->requests[$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);
- }
- }
- }
- } 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)$info['http_code'];
- if (preg_match('/^Location:(.*?)$/m', $this->requests[$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
projects / github / wallabag / wallabag.git / blobdiff