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<?php/*** SimplePie** A PHP-Based RSS and Atom Feed Framework.* Takes the hard work out of managing a complete RSS/Atom solution.** Copyright (c) 2004-2022, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors* All rights reserved.** Redistribution and use in source and binary forms, with or without modification, are* permitted provided that the following conditions are met:** * Redistributions of source code must retain the above copyright notice, this list of* conditions and the following disclaimer.** * Redistributions in binary form must reproduce the above copyright notice, this list* of conditions and the following disclaimer in the documentation and/or other materials* provided with the distribution.** * Neither the name of the SimplePie Team nor the names of its contributors may be used* to endorse or promote products derived from this software without specific prior* written permission.** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE* POSSIBILITY OF SUCH DAMAGE.** @package SimplePie* @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue* @author Ryan Parman* @author Sam Sneddon* @author Ryan McCue* @link http://simplepie.org/ SimplePie* @license http://www.opensource.org/licenses/bsd-license.php BSD License*/namespace SimplePie\Content\Type;/*** Content-type sniffing** Based on the rules in http://tools.ietf.org/html/draft-abarth-mime-sniff-06** This is used since we can't always trust Content-Type headers, and is based* upon the HTML5 parsing rules.*** This class can be overloaded with {@see \SimplePie\SimplePie::set_content_type_sniffer_class()}** @package SimplePie* @subpackage HTTP*/class Sniffer{/*** File object** @var \SimplePie\File*/public $file;/*** Create an instance of the class with the input file** @param Sniffer $file Input file*/public function __construct($file){$this->file = $file;}/*** Get the Content-Type of the specified file** @return string Actual Content-Type*/public function get_type(){if (isset($this->file->headers['content-type'])) {if (!isset($this->file->headers['content-encoding'])&& ($this->file->headers['content-type'] === 'text/plain'|| $this->file->headers['content-type'] === 'text/plain; charset=ISO-8859-1'|| $this->file->headers['content-type'] === 'text/plain; charset=iso-8859-1'|| $this->file->headers['content-type'] === 'text/plain; charset=UTF-8')) {return $this->text_or_binary();}if (($pos = strpos($this->file->headers['content-type'], ';')) !== false) {$official = substr($this->file->headers['content-type'], 0, $pos);} else {$official = $this->file->headers['content-type'];}$official = trim(strtolower($official));if ($official === 'unknown/unknown'|| $official === 'application/unknown') {return $this->unknown();} elseif (substr($official, -4) === '+xml'|| $official === 'text/xml'|| $official === 'application/xml') {return $official;} elseif (substr($official, 0, 6) === 'image/') {if ($return = $this->image()) {return $return;}return $official;} elseif ($official === 'text/html') {return $this->feed_or_html();}return $official;}return $this->unknown();}/*** Sniff text or binary** @return string Actual Content-Type*/public function text_or_binary(){if (substr($this->file->body, 0, 2) === "\xFE\xFF"|| substr($this->file->body, 0, 2) === "\xFF\xFE"|| substr($this->file->body, 0, 4) === "\x00\x00\xFE\xFF"|| substr($this->file->body, 0, 3) === "\xEF\xBB\xBF") {return 'text/plain';} elseif (preg_match('/[\x00-\x08\x0E-\x1A\x1C-\x1F]/', $this->file->body)) {return 'application/octet-stream';}return 'text/plain';}/*** Sniff unknown** @return string Actual Content-Type*/public function unknown(){$ws = strspn($this->file->body, "\x09\x0A\x0B\x0C\x0D\x20");if (strtolower(substr($this->file->body, $ws, 14)) === '<!doctype html'|| strtolower(substr($this->file->body, $ws, 5)) === '<html'|| strtolower(substr($this->file->body, $ws, 7)) === '<script') {return 'text/html';} elseif (substr($this->file->body, 0, 5) === '%PDF-') {return 'application/pdf';} elseif (substr($this->file->body, 0, 11) === '%!PS-Adobe-') {return 'application/postscript';} elseif (substr($this->file->body, 0, 6) === 'GIF87a'|| substr($this->file->body, 0, 6) === 'GIF89a') {return 'image/gif';} elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") {return 'image/png';} elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF") {return 'image/jpeg';} elseif (substr($this->file->body, 0, 2) === "\x42\x4D") {return 'image/bmp';} elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00") {return 'image/vnd.microsoft.icon';}return $this->text_or_binary();}/*** Sniff images** @return string Actual Content-Type*/public function image(){if (substr($this->file->body, 0, 6) === 'GIF87a'|| substr($this->file->body, 0, 6) === 'GIF89a') {return 'image/gif';} elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") {return 'image/png';} elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF") {return 'image/jpeg';} elseif (substr($this->file->body, 0, 2) === "\x42\x4D") {return 'image/bmp';} elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00") {return 'image/vnd.microsoft.icon';}return false;}/*** Sniff HTML** @return string Actual Content-Type*/public function feed_or_html(){$len = strlen($this->file->body);$pos = strspn($this->file->body, "\x09\x0A\x0D\x20\xEF\xBB\xBF");while ($pos < $len) {switch ($this->file->body[$pos]) {case "\x09":case "\x0A":case "\x0D":case "\x20":$pos += strspn($this->file->body, "\x09\x0A\x0D\x20", $pos);continue 2;case '<':$pos++;break;default:return 'text/html';}if (substr($this->file->body, $pos, 3) === '!--') {$pos += 3;if ($pos < $len && ($pos = strpos($this->file->body, '-->', $pos)) !== false) {$pos += 3;} else {return 'text/html';}} elseif (substr($this->file->body, $pos, 1) === '!') {if ($pos < $len && ($pos = strpos($this->file->body, '>', $pos)) !== false) {$pos++;} else {return 'text/html';}} elseif (substr($this->file->body, $pos, 1) === '?') {if ($pos < $len && ($pos = strpos($this->file->body, '?>', $pos)) !== false) {$pos += 2;} else {return 'text/html';}} elseif (substr($this->file->body, $pos, 3) === 'rss'|| substr($this->file->body, $pos, 7) === 'rdf:RDF') {return 'application/rss+xml';} elseif (substr($this->file->body, $pos, 4) === 'feed') {return 'application/atom+xml';} else {return 'text/html';}}return 'text/html';}}class_alias('SimplePie\Content\Type\Sniffer', 'SimplePie_Content_Type_Sniffer');