:arrow_up: Update SimplePie library.

As a follow up to issue #699 update SimplePie from 1.2.1-dev (around
6years old) to current git master (1.4.4-dev). We use the master branch
until the next release because it contains our patch for enclosure
titles already. The other patches in the library from us can be done by
configuring the SimplePie object in our code instead.
Used composer to manage this library and use class autoloading.
Add some unit tests for include/feedutils.php, but the interesting parts
are unfortunately not testable with the current code.

1 files changed, 331 insertions, 0 deletions

diff --git a/vendor/simplepie/simplepie/library/SimplePie/Content/Type/Sniffer.php b/vendor/simplepie/simplepie/library/SimplePie/Content/Type/Sniffer.php
new file mode 100644
index 000000000..ff35de614
--- /dev/null
+++ b/vendor/simplepie/simplepie/library/SimplePie/Content/Type/Sniffer.php
@@ -0,0 +1,331 @@
+<?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;
+				}
+				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\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';
+	}
+}
+