5 * A PHP-Based RSS and Atom Feed Framework.
6 * Takes the hard work out of managing a complete RSS/Atom solution.
8 * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
11 * Redistribution and use in source and binary forms, with or without modification, are
12 * permitted provided that the following conditions are met:
14 * * Redistributions of source code must retain the above copyright notice, this list of
15 * conditions and the following disclaimer.
17 * * Redistributions in binary form must reproduce the above copyright notice, this list
18 * of conditions and the following disclaimer in the documentation and/or other materials
19 * provided with the distribution.
21 * * Neither the name of the SimplePie Team nor the names of its contributors may be used
22 * to endorse or promote products derived from this software without specific prior
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
26 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
27 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
28 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
37 * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
39 * @author Geoffrey Sneddon
41 * @link http://simplepie.org/ SimplePie
42 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
47 * Content-type sniffing
49 * Based on the rules in http://tools.ietf.org/html/draft-abarth-mime-sniff-06
51 * This is used since we can't always trust Content-Type headers, and is based
52 * upon the HTML5 parsing rules.
55 * This class can be overloaded with {@see SimplePie::set_content_type_sniffer_class()}
60 class SimplePie_Content_Type_Sniffer
70 * Create an instance of the class with the input file
72 * @param SimplePie_Content_Type_Sniffer $file Input file
74 public function __construct($file)
80 * Get the Content-Type of the specified file
82 * @return string Actual Content-Type
84 public function get_type()
86 if (isset($this->file
->headers
['content-type']))
88 if (!isset($this->file
->headers
['content-encoding'])
89 && ($this->file
->headers
['content-type'] === 'text/plain'
90 || $this->file
->headers
['content-type'] === 'text/plain; charset=ISO-8859-1'
91 || $this->file
->headers
['content-type'] === 'text/plain; charset=iso-8859-1'
92 || $this->file
->headers
['content-type'] === 'text/plain; charset=UTF-8'))
94 return $this->text_or_binary();
97 if (($pos = strpos($this->file
->headers
['content-type'], ';')) !== false)
99 $official = substr($this->file
->headers
['content-type'], 0, $pos);
103 $official = $this->file
->headers
['content-type'];
105 $official = trim(strtolower($official));
107 if ($official === 'unknown/unknown'
108 || $official === 'application/unknown')
110 return $this->unknown();
112 elseif (substr($official, -4) === '+xml'
113 || $official === 'text/xml'
114 || $official === 'application/xml')
118 elseif (substr($official, 0, 6) === 'image/')
120 if ($return = $this->image())
129 elseif ($official === 'text/html')
131 return $this->feed_or_html();
140 return $this->unknown();
145 * Sniff text or binary
147 * @return string Actual Content-Type
149 public function text_or_binary()
151 if (substr($this->file
->body
, 0, 2) === "\xFE\xFF"
152 || substr($this->file
->body
, 0, 2) === "\xFF\xFE"
153 || substr($this->file
->body
, 0, 4) === "\x00\x00\xFE\xFF"
154 || substr($this->file
->body
, 0, 3) === "\xEF\xBB\xBF")
158 elseif (preg_match('/[\x00-\x08\x0E-\x1A\x1C-\x1F]/', $this->file
->body
))
160 return 'application/octect-stream';
171 * @return string Actual Content-Type
173 public function unknown()
175 $ws = strspn($this->file
->body
, "\x09\x0A\x0B\x0C\x0D\x20");
176 if (strtolower(substr($this->file
->body
, $ws, 14)) === '<!doctype html'
177 || strtolower(substr($this->file
->body
, $ws, 5)) === '<html'
178 || strtolower(substr($this->file
->body
, $ws, 7)) === '<script')
182 elseif (substr($this->file
->body
, 0, 5) === '%PDF-')
184 return 'application/pdf';
186 elseif (substr($this->file
->body
, 0, 11) === '%!PS-Adobe-')
188 return 'application/postscript';
190 elseif (substr($this->file
->body
, 0, 6) === 'GIF87a'
191 || substr($this->file
->body
, 0, 6) === 'GIF89a')
195 elseif (substr($this->file
->body
, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A")
199 elseif (substr($this->file
->body
, 0, 3) === "\xFF\xD8\xFF")
203 elseif (substr($this->file
->body
, 0, 2) === "\x42\x4D")
207 elseif (substr($this->file
->body
, 0, 4) === "\x00\x00\x01\x00")
209 return 'image/vnd.microsoft.icon';
213 return $this->text_or_binary();
220 * @return string Actual Content-Type
222 public function image()
224 if (substr($this->file
->body
, 0, 6) === 'GIF87a'
225 || substr($this->file
->body
, 0, 6) === 'GIF89a')
229 elseif (substr($this->file
->body
, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A")
233 elseif (substr($this->file
->body
, 0, 3) === "\xFF\xD8\xFF")
237 elseif (substr($this->file
->body
, 0, 2) === "\x42\x4D")
241 elseif (substr($this->file
->body
, 0, 4) === "\x00\x00\x01\x00")
243 return 'image/vnd.microsoft.icon';
254 * @return string Actual Content-Type
256 public function feed_or_html()
258 $len = strlen($this->file
->body
);
259 $pos = strspn($this->file
->body
, "\x09\x0A\x0D\x20");
263 switch ($this->file
->body
[$pos])
269 $pos +
= strspn($this->file
->body
, "\x09\x0A\x0D\x20", $pos);
280 if (substr($this->file
->body
, $pos, 3) === '!--')
283 if ($pos < $len && ($pos = strpos($this->file
->body
, '-->', $pos)) !== false)
292 elseif (substr($this->file
->body
, $pos, 1) === '!')
294 if ($pos < $len && ($pos = strpos($this->file
->body
, '>', $pos)) !== false)
303 elseif (substr($this->file
->body
, $pos, 1) === '?')
305 if ($pos < $len && ($pos = strpos($this->file
->body
, '?>', $pos)) !== false)
314 elseif (substr($this->file
->body
, $pos, 3) === 'rss'
315 || substr($this->file
->body
, $pos, 7) === 'rdf:RDF')
317 return 'application/rss+xml';
319 elseif (substr($this->file
->body
, $pos, 4) === 'feed')
321 return 'application/atom+xml';