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WordPress/wp-includes/SimplePie/Content/Type/Sniffer.php
Andrew Nacin 405a995659 Update to SimplePie 1.3. props rmccue. 
Uses individual files for each class. We now conditionally load only the pieces
we need, resulting in less memory usage. Also easier to maintain now that it is
not a single 387KB file.

fixes #21183.



git-svn-id: http://core.svn.wordpress.org/trunk@21644 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2012-08-28 17:24:33 +00:00

333 lines
7.9 KiB
PHP
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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) 2004-2012, 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
* @version 1.3
* @copyright 2004-2012 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;
}
else
{
return $official;
}
}
elseif ($official === 'text/html')
{
return $this->feed_or_html();
}
else
{
return $official;
}
}
else
{
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';
}
else
{
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';
}
else
{
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';
}
else
{
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");
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';
}
}
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