?<h3>D¨ızenle: Sniffer.php</h3>
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/**
 * 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 &quot;AS IS&quot; 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&#039;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-&gt;file = $file;
    }

    /**
     * Get the Content-Type of the specified file
     *
     * @return string Actual Content-Type
     */
    public function get_type()
    {
        if (isset($this-&gt;file-&gt;headers[&#039;content-type&#039;])) {
            if (!isset($this-&gt;file-&gt;headers[&#039;content-encoding&#039;])
                &amp;&amp; ($this-&gt;file-&gt;headers[&#039;content-type&#039;] === &#039;text/plain&#039;
                    || $this-&gt;file-&gt;headers[&#039;content-type&#039;] === &#039;text/plain; charset=ISO-8859-1&#039;
                    || $this-&gt;file-&gt;headers[&#039;content-type&#039;] === &#039;text/plain; charset=iso-8859-1&#039;
                    || $this-&gt;file-&gt;headers[&#039;content-type&#039;] === &#039;text/plain; charset=UTF-8&#039;)) {
                return $this-&gt;text_or_binary();
            }

            if (($pos = strpos($this-&gt;file-&gt;headers[&#039;content-type&#039;], &#039;;&#039;)) !== false) {
                $official = substr($this-&gt;file-&gt;headers[&#039;content-type&#039;], 0, $pos);
            } else {
                $official = $this-&gt;file-&gt;headers[&#039;content-type&#039;];
            }
            $official = trim(strtolower($official));

            if ($official === &#039;unknown/unknown&#039;
                || $official === &#039;application/unknown&#039;) {
                return $this-&gt;unknown();
            } elseif (substr($official, -4) === &#039;+xml&#039;
                || $official === &#039;text/xml&#039;
                || $official === &#039;application/xml&#039;) {
                return $official;
            } elseif (substr($official, 0, 6) === &#039;image/&#039;) {
                if ($return = $this-&gt;image()) {
                    return $return;
                }

                return $official;
            } elseif ($official === &#039;text/html&#039;) {
                return $this-&gt;feed_or_html();
            }

            return $official;
        }

        return $this-&gt;unknown();
    }

    /**
     * Sniff text or binary
     *
     * @return string Actual Content-Type
     */
    public function text_or_binary()
    {
        if (substr($this-&gt;file-&gt;body, 0, 2) === &quot;\xFE\xFF&quot;
            || substr($this-&gt;file-&gt;body, 0, 2) === &quot;\xFF\xFE&quot;
            || substr($this-&gt;file-&gt;body, 0, 4) === &quot;\x00\x00\xFE\xFF&quot;
            || substr($this-&gt;file-&gt;body, 0, 3) === &quot;\xEF\xBB\xBF&quot;) {
            return &#039;text/plain&#039;;
        } elseif (preg_match(&#039;/[\x00-\x08\x0E-\x1A\x1C-\x1F]/&#039;, $this-&gt;file-&gt;body)) {
            return &#039;application/octet-stream&#039;;
        }

        return &#039;text/plain&#039;;
    }

    /**
     * Sniff unknown
     *
     * @return string Actual Content-Type
     */
    public function unknown()
    {
        $ws = strspn($this-&gt;file-&gt;body, &quot;\x09\x0A\x0B\x0C\x0D\x20&quot;);
        if (strtolower(substr($this-&gt;file-&gt;body, $ws, 14)) === &#039;&lt;!doctype html&#039;
            || strtolower(substr($this-&gt;file-&gt;body, $ws, 5)) === &#039;&lt;html&#039;
            || strtolower(substr($this-&gt;file-&gt;body, $ws, 7)) === &#039;&lt;script&#039;) {
            return &#039;text/html&#039;;
        } elseif (substr($this-&gt;file-&gt;body, 0, 5) === &#039;%PDF-&#039;) {
            return &#039;application/pdf&#039;;
        } elseif (substr($this-&gt;file-&gt;body, 0, 11) === &#039;%!PS-Adobe-&#039;) {
            return &#039;application/postscript&#039;;
        } elseif (substr($this-&gt;file-&gt;body, 0, 6) === &#039;GIF87a&#039;
            || substr($this-&gt;file-&gt;body, 0, 6) === &#039;GIF89a&#039;) {
            return &#039;image/gif&#039;;
        } elseif (substr($this-&gt;file-&gt;body, 0, 8) === &quot;\x89\x50\x4E\x47\x0D\x0A\x1A\x0A&quot;) {
            return &#039;image/png&#039;;
        } elseif (substr($this-&gt;file-&gt;body, 0, 3) === &quot;\xFF\xD8\xFF&quot;) {
            return &#039;image/jpeg&#039;;
        } elseif (substr($this-&gt;file-&gt;body, 0, 2) === &quot;\x42\x4D&quot;) {
            return &#039;image/bmp&#039;;
        } elseif (substr($this-&gt;file-&gt;body, 0, 4) === &quot;\x00\x00\x01\x00&quot;) {
            return &#039;image/vnd.microsoft.icon&#039;;
        }

        return $this-&gt;text_or_binary();
    }

    /**
     * Sniff images
     *
     * @return string Actual Content-Type
     */
    public function image()
    {
        if (substr($this-&gt;file-&gt;body, 0, 6) === &#039;GIF87a&#039;
            || substr($this-&gt;file-&gt;body, 0, 6) === &#039;GIF89a&#039;) {
            return &#039;image/gif&#039;;
        } elseif (substr($this-&gt;file-&gt;body, 0, 8) === &quot;\x89\x50\x4E\x47\x0D\x0A\x1A\x0A&quot;) {
            return &#039;image/png&#039;;
        } elseif (substr($this-&gt;file-&gt;body, 0, 3) === &quot;\xFF\xD8\xFF&quot;) {
            return &#039;image/jpeg&#039;;
        } elseif (substr($this-&gt;file-&gt;body, 0, 2) === &quot;\x42\x4D&quot;) {
            return &#039;image/bmp&#039;;
        } elseif (substr($this-&gt;file-&gt;body, 0, 4) === &quot;\x00\x00\x01\x00&quot;) {
            return &#039;image/vnd.microsoft.icon&#039;;
        }

        return false;
    }

    /**
     * Sniff HTML
     *
     * @return string Actual Content-Type
     */
    public function feed_or_html()
    {
        $len = strlen($this-&gt;file-&gt;body);
        $pos = strspn($this-&gt;file-&gt;body, &quot;\x09\x0A\x0D\x20\xEF\xBB\xBF&quot;);

        while ($pos &lt; $len) {
            switch ($this-&gt;file-&gt;body[$pos]) {
                case &quot;\x09&quot;:
                case &quot;\x0A&quot;:
                case &quot;\x0D&quot;:
                case &quot;\x20&quot;:
                    $pos += strspn($this-&gt;file-&gt;body, &quot;\x09\x0A\x0D\x20&quot;, $pos);
                    continue 2;

                case &#039;&lt;&#039;:
                    $pos++;
                    break;

                default:
                    return &#039;text/html&#039;;
            }

            if (substr($this-&gt;file-&gt;body, $pos, 3) === &#039;!--&#039;) {
                $pos += 3;
                if ($pos &lt; $len &amp;&amp; ($pos = strpos($this-&gt;file-&gt;body, &#039;--&gt;&#039;, $pos)) !== false) {
                    $pos += 3;
                } else {
                    return &#039;text/html&#039;;
                }
            } elseif (substr($this-&gt;file-&gt;body, $pos, 1) === &#039;!&#039;) {
                if ($pos &lt; $len &amp;&amp; ($pos = strpos($this-&gt;file-&gt;body, &#039;&gt;&#039;, $pos)) !== false) {
                    $pos++;
                } else {
                    return &#039;text/html&#039;;
                }
            } elseif (substr($this-&gt;file-&gt;body, $pos, 1) === &#039;?&#039;) {
                if ($pos &lt; $len &amp;&amp; ($pos = strpos($this-&gt;file-&gt;body, &#039;?&gt;&#039;, $pos)) !== false) {
                    $pos += 2;
                } else {
                    return &#039;text/html&#039;;
                }
            } elseif (substr($this-&gt;file-&gt;body, $pos, 3) === &#039;rss&#039;
                || substr($this-&gt;file-&gt;body, $pos, 7) === &#039;rdf:RDF&#039;) {
                return &#039;application/rss+xml&#039;;
            } elseif (substr($this-&gt;file-&gt;body, $pos, 4) === &#039;feed&#039;) {
                return &#039;application/atom+xml&#039;;
            } else {
                return &#039;text/html&#039;;
            }
        }

        return &#039;text/html&#039;;
    }
}

class_alias(&#039;SimplePie\Content\Type\Sniffer&#039;, &#039;SimplePie_Content_Type_Sniffer&#039;);
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