Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1236 insertions, 0 deletions

diff --git a/wp-includes/SimplePie/IRI.php b/wp-includes/SimplePie/IRI.php
new file mode 100644
index 0000000..a02de68
--- /dev/null
+++ b/wp-includes/SimplePie/IRI.php
@@ -0,0 +1,1236 @@
+<?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
+ */
+
+/**
+ * IRI parser/serialiser/normaliser
+ *
+ * @package SimplePie
+ * @subpackage HTTP
+ * @author Sam Sneddon
+ * @author Steve Minutillo
+ * @author Ryan McCue
+ * @copyright 2007-2012 Sam Sneddon, Steve Minutillo, Ryan McCue
+ * @license http://www.opensource.org/licenses/bsd-license.php
+ */
+class SimplePie_IRI
+{
+	/**
+	 * Scheme
+	 *
+	 * @var string
+	 */
+	protected $scheme = null;
+
+	/**
+	 * User Information
+	 *
+	 * @var string
+	 */
+	protected $iuserinfo = null;
+
+	/**
+	 * ihost
+	 *
+	 * @var string
+	 */
+	protected $ihost = null;
+
+	/**
+	 * Port
+	 *
+	 * @var string
+	 */
+	protected $port = null;
+
+	/**
+	 * ipath
+	 *
+	 * @var string
+	 */
+	protected $ipath = '';
+
+	/**
+	 * iquery
+	 *
+	 * @var string
+	 */
+	protected $iquery = null;
+
+	/**
+	 * ifragment
+	 *
+	 * @var string
+	 */
+	protected $ifragment = null;
+
+	/**
+	 * Normalization database
+	 *
+	 * Each key is the scheme, each value is an array with each key as the IRI
+	 * part and value as the default value for that part.
+	 */
+	protected $normalization = array(
+		'acap' => array(
+			'port' => 674
+		),
+		'dict' => array(
+			'port' => 2628
+		),
+		'file' => array(
+			'ihost' => 'localhost'
+		),
+		'http' => array(
+			'port' => 80,
+			'ipath' => '/'
+		),
+		'https' => array(
+			'port' => 443,
+			'ipath' => '/'
+		),
+	);
+
+	/**
+	 * Return the entire IRI when you try and read the object as a string
+	 *
+	 * @return string
+	 */
+	public function __toString()
+	{
+		return $this->get_iri();
+	}
+
+	/**
+	 * Overload __set() to provide access via properties
+	 *
+	 * @param string $name Property name
+	 * @param mixed $value Property value
+	 */
+	public function __set($name, $value)
+	{
+		if (method_exists($this, 'set_' . $name))
+		{
+			call_user_func(array($this, 'set_' . $name), $value);
+		}
+		elseif (
+			   $name === 'iauthority'
+			|| $name === 'iuserinfo'
+			|| $name === 'ihost'
+			|| $name === 'ipath'
+			|| $name === 'iquery'
+			|| $name === 'ifragment'
+		)
+		{
+			call_user_func(array($this, 'set_' . substr($name, 1)), $value);
+		}
+	}
+
+	/**
+	 * Overload __get() to provide access via properties
+	 *
+	 * @param string $name Property name
+	 * @return mixed
+	 */
+	public function __get($name)
+	{
+		// isset() returns false for null, we don't want to do that
+		// Also why we use array_key_exists below instead of isset()
+		$props = get_object_vars($this);
+
+		if (
+			$name === 'iri' ||
+			$name === 'uri' ||
+			$name === 'iauthority' ||
+			$name === 'authority'
+		)
+		{
+			$return = $this->{"get_$name"}();
+		}
+		elseif (array_key_exists($name, $props))
+		{
+			$return = $this->$name;
+		}
+		// host -> ihost
+		elseif (($prop = 'i' . $name) && array_key_exists($prop, $props))
+		{
+			$name = $prop;
+			$return = $this->$prop;
+		}
+		// ischeme -> scheme
+		elseif (($prop = substr($name, 1)) && array_key_exists($prop, $props))
+		{
+			$name = $prop;
+			$return = $this->$prop;
+		}
+		else
+		{
+			trigger_error('Undefined property: ' . get_class($this) . '::' . $name, E_USER_NOTICE);
+			$return = null;
+		}
+
+		if ($return === null && isset($this->normalization[$this->scheme][$name]))
+		{
+			return $this->normalization[$this->scheme][$name];
+		}
+
+		return $return;
+	}
+
+	/**
+	 * Overload __isset() to provide access via properties
+	 *
+	 * @param string $name Property name
+	 * @return bool
+	 */
+	public function __isset($name)
+	{
+		return method_exists($this, 'get_' . $name) || isset($this->$name);
+	}
+
+	/**
+	 * Overload __unset() to provide access via properties
+	 *
+	 * @param string $name Property name
+	 */
+	public function __unset($name)
+	{
+		if (method_exists($this, 'set_' . $name))
+		{
+			call_user_func(array($this, 'set_' . $name), '');
+		}
+	}
+
+	/**
+	 * Create a new IRI object, from a specified string
+	 *
+	 * @param string $iri
+	 */
+	public function __construct($iri = null)
+	{
+		$this->set_iri($iri);
+	}
+
+	/**
+	 * Clean up
+	 */
+	public function __destruct() {
+	    $this->set_iri(null, true);
+	    $this->set_path(null, true);
+	    $this->set_authority(null, true);
+	}
+
+	/**
+	 * Create a new IRI object by resolving a relative IRI
+	 *
+	 * Returns false if $base is not absolute, otherwise an IRI.
+	 *
+	 * @param IRI|string $base (Absolute) Base IRI
+	 * @param IRI|string $relative Relative IRI
+	 * @return IRI|false
+	 */
+	public static function absolutize($base, $relative)
+	{
+		if (!($relative instanceof SimplePie_IRI))
+		{
+			$relative = new SimplePie_IRI($relative);
+		}
+		if (!$relative->is_valid())
+		{
+			return false;
+		}
+		elseif ($relative->scheme !== null)
+		{
+			return clone $relative;
+		}
+		else
+		{
+			if (!($base instanceof SimplePie_IRI))
+			{
+				$base = new SimplePie_IRI($base);
+			}
+			if ($base->scheme !== null && $base->is_valid())
+			{
+				if ($relative->get_iri() !== '')
+				{
+					if ($relative->iuserinfo !== null || $relative->ihost !== null || $relative->port !== null)
+					{
+						$target = clone $relative;
+						$target->scheme = $base->scheme;
+					}
+					else
+					{
+						$target = new SimplePie_IRI;
+						$target->scheme = $base->scheme;
+						$target->iuserinfo = $base->iuserinfo;
+						$target->ihost = $base->ihost;
+						$target->port = $base->port;
+						if ($relative->ipath !== '')
+						{
+							if ($relative->ipath[0] === '/')
+							{
+								$target->ipath = $relative->ipath;
+							}
+							elseif (($base->iuserinfo !== null || $base->ihost !== null || $base->port !== null) && $base->ipath === '')
+							{
+								$target->ipath = '/' . $relative->ipath;
+							}
+							elseif (($last_segment = strrpos($base->ipath, '/')) !== false)
+							{
+								$target->ipath = substr($base->ipath, 0, $last_segment + 1) . $relative->ipath;
+							}
+							else
+							{
+								$target->ipath = $relative->ipath;
+							}
+							$target->ipath = $target->remove_dot_segments($target->ipath);
+							$target->iquery = $relative->iquery;
+						}
+						else
+						{
+							$target->ipath = $base->ipath;
+							if ($relative->iquery !== null)
+							{
+								$target->iquery = $relative->iquery;
+							}
+							elseif ($base->iquery !== null)
+							{
+								$target->iquery = $base->iquery;
+							}
+						}
+						$target->ifragment = $relative->ifragment;
+					}
+				}
+				else
+				{
+					$target = clone $base;
+					$target->ifragment = null;
+				}
+				$target->scheme_normalization();
+				return $target;
+			}
+
+			return false;
+		}
+	}
+
+	/**
+	 * Parse an IRI into scheme/authority/path/query/fragment segments
+	 *
+	 * @param string $iri
+	 * @return array
+	 */
+	protected function parse_iri($iri)
+	{
+		$iri = trim($iri, "\x20\x09\x0A\x0C\x0D");
+		if (preg_match('/^((?P<scheme>[^:\/?#]+):)?(\/\/(?P<authority>[^\/?#]*))?(?P<path>[^?#]*)(\?(?P<query>[^#]*))?(#(?P<fragment>.*))?$/', $iri, $match))
+		{
+			if ($match[1] === '')
+			{
+				$match['scheme'] = null;
+			}
+			if (!isset($match[3]) || $match[3] === '')
+			{
+				$match['authority'] = null;
+			}
+			if (!isset($match[5]))
+			{
+				$match['path'] = '';
+			}
+			if (!isset($match[6]) || $match[6] === '')
+			{
+				$match['query'] = null;
+			}
+			if (!isset($match[8]) || $match[8] === '')
+			{
+				$match['fragment'] = null;
+			}
+			return $match;
+		}
+
+		// This can occur when a paragraph is accidentally parsed as a URI
+		return false;
+	}
+
+	/**
+	 * Remove dot segments from a path
+	 *
+	 * @param string $input
+	 * @return string
+	 */
+	protected function remove_dot_segments($input)
+	{
+		$output = '';
+		while (strpos($input, './') !== false || strpos($input, '/.') !== false || $input === '.' || $input === '..')
+		{
+			// A: If the input buffer begins with a prefix of "../" or "./", then remove that prefix from the input buffer; otherwise,
+			if (strpos($input, '../') === 0)
+			{
+				$input = substr($input, 3);
+			}
+			elseif (strpos($input, './') === 0)
+			{
+				$input = substr($input, 2);
+			}
+			// B: if the input buffer begins with a prefix of "/./" or "/.", where "." is a complete path segment, then replace that prefix with "/" in the input buffer; otherwise,
+			elseif (strpos($input, '/./') === 0)
+			{
+				$input = substr($input, 2);
+			}
+			elseif ($input === '/.')
+			{
+				$input = '/';
+			}
+			// C: if the input buffer begins with a prefix of "/../" or "/..", where ".." is a complete path segment, then replace that prefix with "/" in the input buffer and remove the last segment and its preceding "/" (if any) from the output buffer; otherwise,
+			elseif (strpos($input, '/../') === 0)
+			{
+				$input = substr($input, 3);
+				$output = substr_replace($output, '', strrpos($output, '/'));
+			}
+			elseif ($input === '/..')
+			{
+				$input = '/';
+				$output = substr_replace($output, '', strrpos($output, '/'));
+			}
+			// D: if the input buffer consists only of "." or "..", then remove that from the input buffer; otherwise,
+			elseif ($input === '.' || $input === '..')
+			{
+				$input = '';
+			}
+			// E: move the first path segment in the input buffer to the end of the output buffer, including the initial "/" character (if any) and any subsequent characters up to, but not including, the next "/" character or the end of the input buffer
+			elseif (($pos = strpos($input, '/', 1)) !== false)
+			{
+				$output .= substr($input, 0, $pos);
+				$input = substr_replace($input, '', 0, $pos);
+			}
+			else
+			{
+				$output .= $input;
+				$input = '';
+			}
+		}
+		return $output . $input;
+	}
+
+	/**
+	 * Replace invalid character with percent encoding
+	 *
+	 * @param string $string Input string
+	 * @param string $extra_chars Valid characters not in iunreserved or
+	 *                            iprivate (this is ASCII-only)
+	 * @param bool $iprivate Allow iprivate
+	 * @return string
+	 */
+	protected function replace_invalid_with_pct_encoding($string, $extra_chars, $iprivate = false)
+	{
+		// Normalize as many pct-encoded sections as possible
+		$string = preg_replace_callback('/(?:%[A-Fa-f0-9]{2})+/', array($this, 'remove_iunreserved_percent_encoded'), $string);
+
+		// Replace invalid percent characters
+		$string = preg_replace('/%(?![A-Fa-f0-9]{2})/', '%25', $string);
+
+		// Add unreserved and % to $extra_chars (the latter is safe because all
+		// pct-encoded sections are now valid).
+		$extra_chars .= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~%';
+
+		// Now replace any bytes that aren't allowed with their pct-encoded versions
+		$position = 0;
+		$strlen = strlen($string);
+		while (($position += strspn($string, $extra_chars, $position)) < $strlen)
+		{
+			$value = ord($string[$position]);
+
+			// Start position
+			$start = $position;
+
+			// By default we are valid
+			$valid = true;
+
+			// No one byte sequences are valid due to the while.
+			// Two byte sequence:
+			if (($value & 0xE0) === 0xC0)
+			{
+				$character = ($value & 0x1F) << 6;
+				$length = 2;
+				$remaining = 1;
+			}
+			// Three byte sequence:
+			elseif (($value & 0xF0) === 0xE0)
+			{
+				$character = ($value & 0x0F) << 12;
+				$length = 3;
+				$remaining = 2;
+			}
+			// Four byte sequence:
+			elseif (($value & 0xF8) === 0xF0)
+			{
+				$character = ($value & 0x07) << 18;
+				$length = 4;
+				$remaining = 3;
+			}
+			// Invalid byte:
+			else
+			{
+				$valid = false;
+				$length = 1;
+				$remaining = 0;
+			}
+
+			if ($remaining)
+			{
+				if ($position + $length <= $strlen)
+				{
+					for ($position++; $remaining; $position++)
+					{
+						$value = ord($string[$position]);
+
+						// Check that the byte is valid, then add it to the character:
+						if (($value & 0xC0) === 0x80)
+						{
+							$character |= ($value & 0x3F) << (--$remaining * 6);
+						}
+						// If it is invalid, count the sequence as invalid and reprocess the current byte:
+						else
+						{
+							$valid = false;
+							$position--;
+							break;
+						}
+					}
+				}
+				else
+				{
+					$position = $strlen - 1;
+					$valid = false;
+				}
+			}
+
+			// Percent encode anything invalid or not in ucschar
+			if (
+				// Invalid sequences
+				!$valid
+				// Non-shortest form sequences are invalid
+				|| $length > 1 && $character <= 0x7F
+				|| $length > 2 && $character <= 0x7FF
+				|| $length > 3 && $character <= 0xFFFF
+				// Outside of range of ucschar codepoints
+				// Noncharacters
+				|| ($character & 0xFFFE) === 0xFFFE
+				|| $character >= 0xFDD0 && $character <= 0xFDEF
+				|| (
+					// Everything else not in ucschar
+					   $character > 0xD7FF && $character < 0xF900
+					|| $character < 0xA0
+					|| $character > 0xEFFFD
+				)
+				&& (
+					// Everything not in iprivate, if it applies
+					   !$iprivate
+					|| $character < 0xE000
+					|| $character > 0x10FFFD
+				)
+			)
+			{
+				// If we were a character, pretend we weren't, but rather an error.
+				if ($valid)
+					$position--;
+
+				for ($j = $start; $j <= $position; $j++)
+				{
+					$string = substr_replace($string, sprintf('%%%02X', ord($string[$j])), $j, 1);
+					$j += 2;
+					$position += 2;
+					$strlen += 2;
+				}
+			}
+		}
+
+		return $string;
+	}
+
+	/**
+	 * Callback function for preg_replace_callback.
+	 *
+	 * Removes sequences of percent encoded bytes that represent UTF-8
+	 * encoded characters in iunreserved
+	 *
+	 * @param array $match PCRE match
+	 * @return string Replacement
+	 */
+	protected function remove_iunreserved_percent_encoded($match)
+	{
+		// As we just have valid percent encoded sequences we can just explode
+		// and ignore the first member of the returned array (an empty string).
+		$bytes = explode('%', $match[0]);
+
+		// Initialize the new string (this is what will be returned) and that
+		// there are no bytes remaining in the current sequence (unsurprising
+		// at the first byte!).
+		$string = '';
+		$remaining = 0;
+
+		// Loop over each and every byte, and set $value to its value
+		for ($i = 1, $len = count($bytes); $i < $len; $i++)
+		{
+			$value = hexdec($bytes[$i]);
+
+			// If we're the first byte of sequence:
+			if (!$remaining)
+			{
+				// Start position
+				$start = $i;
+
+				// By default we are valid
+				$valid = true;
+
+				// One byte sequence:
+				if ($value <= 0x7F)
+				{
+					$character = $value;
+					$length = 1;
+				}
+				// Two byte sequence:
+				elseif (($value & 0xE0) === 0xC0)
+				{
+					$character = ($value & 0x1F) << 6;
+					$length = 2;
+					$remaining = 1;
+				}
+				// Three byte sequence:
+				elseif (($value & 0xF0) === 0xE0)
+				{
+					$character = ($value & 0x0F) << 12;
+					$length = 3;
+					$remaining = 2;
+				}
+				// Four byte sequence:
+				elseif (($value & 0xF8) === 0xF0)
+				{
+					$character = ($value & 0x07) << 18;
+					$length = 4;
+					$remaining = 3;
+				}
+				// Invalid byte:
+				else
+				{
+					$valid = false;
+					$remaining = 0;
+				}
+			}
+			// Continuation byte:
+			else
+			{
+				// Check that the byte is valid, then add it to the character:
+				if (($value & 0xC0) === 0x80)
+				{
+					$remaining--;
+					$character |= ($value & 0x3F) << ($remaining * 6);
+				}
+				// If it is invalid, count the sequence as invalid and reprocess the current byte as the start of a sequence:
+				else
+				{
+					$valid = false;
+					$remaining = 0;
+					$i--;
+				}
+			}
+
+			// If we've reached the end of the current byte sequence, append it to Unicode::$data
+			if (!$remaining)
+			{
+				// Percent encode anything invalid or not in iunreserved
+				if (
+					// Invalid sequences
+					!$valid
+					// Non-shortest form sequences are invalid
+					|| $length > 1 && $character <= 0x7F
+					|| $length > 2 && $character <= 0x7FF
+					|| $length > 3 && $character <= 0xFFFF
+					// Outside of range of iunreserved codepoints
+					|| $character < 0x2D
+					|| $character > 0xEFFFD
+					// Noncharacters
+					|| ($character & 0xFFFE) === 0xFFFE
+					|| $character >= 0xFDD0 && $character <= 0xFDEF
+					// Everything else not in iunreserved (this is all BMP)
+					|| $character === 0x2F
+					|| $character > 0x39 && $character < 0x41
+					|| $character > 0x5A && $character < 0x61
+					|| $character > 0x7A && $character < 0x7E
+					|| $character > 0x7E && $character < 0xA0
+					|| $character > 0xD7FF && $character < 0xF900
+				)
+				{
+					for ($j = $start; $j <= $i; $j++)
+					{
+						$string .= '%' . strtoupper($bytes[$j]);
+					}
+				}
+				else
+				{
+					for ($j = $start; $j <= $i; $j++)
+					{
+						$string .= chr(hexdec($bytes[$j]));
+					}
+				}
+			}
+		}
+
+		// If we have any bytes left over they are invalid (i.e., we are
+		// mid-way through a multi-byte sequence)
+		if ($remaining)
+		{
+			for ($j = $start; $j < $len; $j++)
+			{
+				$string .= '%' . strtoupper($bytes[$j]);
+			}
+		}
+
+		return $string;
+	}
+
+	protected function scheme_normalization()
+	{
+		if (isset($this->normalization[$this->scheme]['iuserinfo']) && $this->iuserinfo === $this->normalization[$this->scheme]['iuserinfo'])
+		{
+			$this->iuserinfo = null;
+		}
+		if (isset($this->normalization[$this->scheme]['ihost']) && $this->ihost === $this->normalization[$this->scheme]['ihost'])
+		{
+			$this->ihost = null;
+		}
+		if (isset($this->normalization[$this->scheme]['port']) && $this->port === $this->normalization[$this->scheme]['port'])
+		{
+			$this->port = null;
+		}
+		if (isset($this->normalization[$this->scheme]['ipath']) && $this->ipath === $this->normalization[$this->scheme]['ipath'])
+		{
+			$this->ipath = '';
+		}
+		if (isset($this->normalization[$this->scheme]['iquery']) && $this->iquery === $this->normalization[$this->scheme]['iquery'])
+		{
+			$this->iquery = null;
+		}
+		if (isset($this->normalization[$this->scheme]['ifragment']) && $this->ifragment === $this->normalization[$this->scheme]['ifragment'])
+		{
+			$this->ifragment = null;
+		}
+	}
+
+	/**
+	 * Check if the object represents a valid IRI. This needs to be done on each
+	 * call as some things change depending on another part of the IRI.
+	 *
+	 * @return bool
+	 */
+	public function is_valid()
+	{
+		if ($this->ipath === '') return true;
+
+		$isauthority = $this->iuserinfo !== null || $this->ihost !== null ||
+			$this->port !== null;
+		if ($isauthority && $this->ipath[0] === '/') return true;
+
+		if (!$isauthority && (substr($this->ipath, 0, 2) === '//')) return false;
+
+		// Relative urls cannot have a colon in the first path segment (and the
+		// slashes themselves are not included so skip the first character).
+		if (!$this->scheme && !$isauthority &&
+		    strpos($this->ipath, ':') !== false &&
+		    strpos($this->ipath, '/', 1) !== false &&
+		    strpos($this->ipath, ':') < strpos($this->ipath, '/', 1)) return false;
+
+		return true;
+	}
+
+	/**
+	 * Set the entire IRI. Returns true on success, false on failure (if there
+	 * are any invalid characters).
+	 *
+	 * @param string $iri
+	 * @return bool
+	 */
+	public function set_iri($iri, $clear_cache = false)
+	{
+		static $cache;
+		if ($clear_cache)
+		{
+			$cache = null;
+			return;
+		}
+		if (!$cache)
+		{
+			$cache = array();
+		}
+
+		if ($iri === null)
+		{
+			return true;
+		}
+		elseif (isset($cache[$iri]))
+		{
+			list($this->scheme,
+				 $this->iuserinfo,
+				 $this->ihost,
+				 $this->port,
+				 $this->ipath,
+				 $this->iquery,
+				 $this->ifragment,
+				 $return) = $cache[$iri];
+			return $return;
+		}
+
+		$parsed = $this->parse_iri((string) $iri);
+		if (!$parsed)
+		{
+			return false;
+		}
+
+		$return = $this->set_scheme($parsed['scheme'])
+			&& $this->set_authority($parsed['authority'])
+			&& $this->set_path($parsed['path'])
+			&& $this->set_query($parsed['query'])
+			&& $this->set_fragment($parsed['fragment']);
+
+		$cache[$iri] = array($this->scheme,
+							 $this->iuserinfo,
+							 $this->ihost,
+							 $this->port,
+							 $this->ipath,
+							 $this->iquery,
+							 $this->ifragment,
+							 $return);
+		return $return;
+	}
+
+	/**
+	 * Set the scheme. Returns true on success, false on failure (if there are
+	 * any invalid characters).
+	 *
+	 * @param string $scheme
+	 * @return bool
+	 */
+	public function set_scheme($scheme)
+	{
+		if ($scheme === null)
+		{
+			$this->scheme = null;
+		}
+		elseif (!preg_match('/^[A-Za-z][0-9A-Za-z+\-.]*$/', $scheme))
+		{
+			$this->scheme = null;
+			return false;
+		}
+		else
+		{
+			$this->scheme = strtolower($scheme);
+		}
+		return true;
+	}
+
+	/**
+	 * Set the authority. Returns true on success, false on failure (if there are
+	 * any invalid characters).
+	 *
+	 * @param string $authority
+	 * @return bool
+	 */
+	public function set_authority($authority, $clear_cache = false)
+	{
+		static $cache;
+		if ($clear_cache)
+		{
+			$cache = null;
+			return;
+		}
+		if (!$cache)
+			$cache = array();
+
+		if ($authority === null)
+		{
+			$this->iuserinfo = null;
+			$this->ihost = null;
+			$this->port = null;
+			return true;
+		}
+		elseif (isset($cache[$authority]))
+		{
+			list($this->iuserinfo,
+				 $this->ihost,
+				 $this->port,
+				 $return) = $cache[$authority];
+
+			return $return;
+		}
+
+		$remaining = $authority;
+		if (($iuserinfo_end = strrpos($remaining, '@')) !== false)
+		{
+			$iuserinfo = substr($remaining, 0, $iuserinfo_end);
+			$remaining = substr($remaining, $iuserinfo_end + 1);
+		}
+		else
+		{
+			$iuserinfo = null;
+		}
+		if (($port_start = strpos($remaining, ':', strpos($remaining, ']'))) !== false)
+		{
+			if (($port = substr($remaining, $port_start + 1)) === false)
+			{
+				$port = null;
+			}
+			$remaining = substr($remaining, 0, $port_start);
+		}
+		else
+		{
+			$port = null;
+		}
+
+		$return = $this->set_userinfo($iuserinfo) &&
+				  $this->set_host($remaining) &&
+				  $this->set_port($port);
+
+		$cache[$authority] = array($this->iuserinfo,
+								   $this->ihost,
+								   $this->port,
+								   $return);
+
+		return $return;
+	}
+
+	/**
+	 * Set the iuserinfo.
+	 *
+	 * @param string $iuserinfo
+	 * @return bool
+	 */
+	public function set_userinfo($iuserinfo)
+	{
+		if ($iuserinfo === null)
+		{
+			$this->iuserinfo = null;
+		}
+		else
+		{
+			$this->iuserinfo = $this->replace_invalid_with_pct_encoding($iuserinfo, '!$&\'()*+,;=:');
+			$this->scheme_normalization();
+		}
+
+		return true;
+	}
+
+	/**
+	 * Set the ihost. Returns true on success, false on failure (if there are
+	 * any invalid characters).
+	 *
+	 * @param string $ihost
+	 * @return bool
+	 */
+	public function set_host($ihost)
+	{
+		if ($ihost === null)
+		{
+			$this->ihost = null;
+			return true;
+		}
+		elseif (substr($ihost, 0, 1) === '[' && substr($ihost, -1) === ']')
+		{
+			if (SimplePie_Net_IPv6::check_ipv6(substr($ihost, 1, -1)))
+			{
+				$this->ihost = '[' . SimplePie_Net_IPv6::compress(substr($ihost, 1, -1)) . ']';
+			}
+			else
+			{
+				$this->ihost = null;
+				return false;
+			}
+		}
+		else
+		{
+			$ihost = $this->replace_invalid_with_pct_encoding($ihost, '!$&\'()*+,;=');
+
+			// Lowercase, but ignore pct-encoded sections (as they should
+			// remain uppercase). This must be done after the previous step
+			// as that can add unescaped characters.
+			$position = 0;
+			$strlen = strlen($ihost);
+			while (($position += strcspn($ihost, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ%', $position)) < $strlen)
+			{
+				if ($ihost[$position] === '%')
+				{
+					$position += 3;
+				}
+				else
+				{
+					$ihost[$position] = strtolower($ihost[$position]);
+					$position++;
+				}
+			}
+
+			$this->ihost = $ihost;
+		}
+
+		$this->scheme_normalization();
+
+		return true;
+	}
+
+	/**
+	 * Set the port. Returns true on success, false on failure (if there are
+	 * any invalid characters).
+	 *
+	 * @param string $port
+	 * @return bool
+	 */
+	public function set_port($port)
+	{
+		if ($port === null)
+		{
+			$this->port = null;
+			return true;
+		}
+		elseif (strspn($port, '0123456789') === strlen($port))
+		{
+			$this->port = (int) $port;
+			$this->scheme_normalization();
+			return true;
+		}
+
+		$this->port = null;
+		return false;
+	}
+
+	/**
+	 * Set the ipath.
+	 *
+	 * @param string $ipath
+	 * @return bool
+	 */
+	public function set_path($ipath, $clear_cache = false)
+	{
+		static $cache;
+		if ($clear_cache)
+		{
+			$cache = null;
+			return;
+		}
+		if (!$cache)
+		{
+			$cache = array();
+		}
+
+		$ipath = (string) $ipath;
+
+		if (isset($cache[$ipath]))
+		{
+			$this->ipath = $cache[$ipath][(int) ($this->scheme !== null)];
+		}
+		else
+		{
+			$valid = $this->replace_invalid_with_pct_encoding($ipath, '!$&\'()*+,;=@:/');
+			$removed = $this->remove_dot_segments($valid);
+
+			$cache[$ipath] = array($valid, $removed);
+			$this->ipath =  ($this->scheme !== null) ? $removed : $valid;
+		}
+
+		$this->scheme_normalization();
+		return true;
+	}
+
+	/**
+	 * Set the iquery.
+	 *
+	 * @param string $iquery
+	 * @return bool
+	 */
+	public function set_query($iquery)
+	{
+		if ($iquery === null)
+		{
+			$this->iquery = null;
+		}
+		else
+		{
+			$this->iquery = $this->replace_invalid_with_pct_encoding($iquery, '!$&\'()*+,;=:@/?', true);
+			$this->scheme_normalization();
+		}
+		return true;
+	}
+
+	/**
+	 * Set the ifragment.
+	 *
+	 * @param string $ifragment
+	 * @return bool
+	 */
+	public function set_fragment($ifragment)
+	{
+		if ($ifragment === null)
+		{
+			$this->ifragment = null;
+		}
+		else
+		{
+			$this->ifragment = $this->replace_invalid_with_pct_encoding($ifragment, '!$&\'()*+,;=:@/?');
+			$this->scheme_normalization();
+		}
+		return true;
+	}
+
+	/**
+	 * Convert an IRI to a URI (or parts thereof)
+	 *
+	 * @return string
+	 */
+	public function to_uri($string)
+	{
+		static $non_ascii;
+		if (!$non_ascii)
+		{
+			$non_ascii = implode('', range("\x80", "\xFF"));
+		}
+
+		$position = 0;
+		$strlen = strlen($string);
+		while (($position += strcspn($string, $non_ascii, $position)) < $strlen)
+		{
+			$string = substr_replace($string, sprintf('%%%02X', ord($string[$position])), $position, 1);
+			$position += 3;
+			$strlen += 2;
+		}
+
+		return $string;
+	}
+
+	/**
+	 * Get the complete IRI
+	 *
+	 * @return string
+	 */
+	public function get_iri()
+	{
+		if (!$this->is_valid())
+		{
+			return false;
+		}
+
+		$iri = '';
+		if ($this->scheme !== null)
+		{
+			$iri .= $this->scheme . ':';
+		}
+		if (($iauthority = $this->get_iauthority()) !== null)
+		{
+			$iri .= '//' . $iauthority;
+		}
+		if ($this->ipath !== '')
+		{
+			$iri .= $this->ipath;
+		}
+        elseif (!empty($this->normalization[$this->scheme]['ipath']) && $iauthority !== null && $iauthority !== '')
+		{
+			$iri .= $this->normalization[$this->scheme]['ipath'];
+		}
+		if ($this->iquery !== null)
+		{
+			$iri .= '?' . $this->iquery;
+		}
+		if ($this->ifragment !== null)
+		{
+			$iri .= '#' . $this->ifragment;
+		}
+
+		return $iri;
+	}
+
+	/**
+	 * Get the complete URI
+	 *
+	 * @return string
+	 */
+	public function get_uri()
+	{
+		return $this->to_uri($this->get_iri());
+	}
+
+	/**
+	 * Get the complete iauthority
+	 *
+	 * @return string
+	 */
+	protected function get_iauthority()
+	{
+		if ($this->iuserinfo !== null || $this->ihost !== null || $this->port !== null)
+		{
+			$iauthority = '';
+			if ($this->iuserinfo !== null)
+			{
+				$iauthority .= $this->iuserinfo . '@';
+			}
+			if ($this->ihost !== null)
+			{
+				$iauthority .= $this->ihost;
+			}
+            if ($this->port !== null && $this->port !== 0)
+			{
+				$iauthority .= ':' . $this->port;
+			}
+			return $iauthority;
+		}
+
+		return null;
+	}
+
+	/**
+	 * Get the complete authority
+	 *
+	 * @return string
+	 */
+	protected function get_authority()
+	{
+		$iauthority = $this->get_iauthority();
+		if (is_string($iauthority))
+			return $this->to_uri($iauthority);
+
+		return $iauthority;
+	}
+}