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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) 2004-2016, Ryan Parman, Geoffrey 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, Geoffrey Sneddon, Ryan McCue
+ * @author Ryan Parman
+ * @author Geoffrey Sneddon
+ * @author Ryan McCue
+ * @link http://simplepie.org/ SimplePie
+ * @license http://www.opensource.org/licenses/bsd-license.php BSD License
+ */
+
+
+/**
+ * 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::set_content_type_sniffer_class()}
+ *
+ * @package SimplePie
+ * @subpackage HTTP
+ */
+class SimplePie_Content_Type_Sniffer
+{
+ /**
+ * File object
+ *
+ * @var SimplePie_File
+ */
+ var $file;
+
+ /**
+ * Create an instance of the class with the input file
+ *
+ * @param SimplePie_Content_Type_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/octect-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';
+ }
+}
generated by cgit v1.2.1 (git 2.21.0) at 2024-04-18 23:21:52 +0000