ru-se.com

Sniffer.php (8015B)

---

 <?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, 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
  */
 
 
 /**
  * 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/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';
 	}
 }