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Edit File : Parser.php \| Size : 10.63 KB
<?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 1.3.1 * @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 / /* * HTTP Response Parser * * @package SimplePie * @subpackage HTTP / class SimplePie_HTTP_Parser { /* * HTTP Version * * @var float / public $http_version = 0.0; /* * Status code * * @var int / public $status_code = 0; /* * Reason phrase * * @var string / public $reason = ''; /* * Key/value pairs of the headers * * @var array / public $headers = array(); /* * Body of the response * * @var string / public $body = ''; /* * Current state of the state machine * * @var string / protected $state = 'http_version'; /* * Input data * * @var string / protected $data = ''; /* * Input data length (to avoid calling strlen() everytime this is needed) * * @var int / protected $data_length = 0; /* * Current position of the pointer * * @var int / protected $position = 0; /* * Name of the hedaer currently being parsed * * @var string / protected $name = ''; /* * Value of the hedaer currently being parsed * * @var string / protected $value = ''; /* * Create an instance of the class with the input data * * @param string $data Input data / public function __construct($data) { $this->data = $data; $this->data_length = strlen($this->data); } /* * Parse the input data * * @return bool true on success, false on failure / public function parse() { while ($this->state && $this->state !== 'emit' && $this->has_data()) { $state = $this->state; $this->$state(); } $this->data = ''; if ($this->state === 'emit' \|\| $this->state === 'body') { return true; } else { $this->http_version = ''; $this->status_code = ''; $this->reason = ''; $this->headers = array(); $this->body = ''; return false; } } /* * Check whether there is data beyond the pointer * * @return bool true if there is further data, false if not / protected function has_data() { return (bool) ($this->position < $this->data_length); } /* * See if the next character is LWS * * @return bool true if the next character is LWS, false if not / protected function is_linear_whitespace() { return (bool) ($this->data[$this->position] === "\x09" \|\| $this->data[$this->position] === "\x20" \|\| ($this->data[$this->position] === "\x0A" && isset($this->data[$this->position + 1]) && ($this->data[$this->position + 1] === "\x09" \|\| $this->data[$this->position + 1] === "\x20"))); } /* * Parse the HTTP version / protected function http_version() { if (strpos($this->data, "\x0A") !== false && strtoupper(substr($this->data, 0, 5)) === 'HTTP/') { $len = strspn($this->data, '0123456789.', 5); $this->http_version = substr($this->data, 5, $len); $this->position += 5 + $len; if (substr_count($this->http_version, '.') <= 1) { $this->http_version = (float) $this->http_version; $this->position += strspn($this->data, "\x09\x20", $this->position); $this->state = 'status'; } else { $this->state = false; } } else { $this->state = false; } } /* * Parse the status code / protected function status() { if ($len = strspn($this->data, '0123456789', $this->position)) { $this->status_code = (int) substr($this->data, $this->position, $len); $this->position += $len; $this->state = 'reason'; } else { $this->state = false; } } /* * Parse the reason phrase / protected function reason() { $len = strcspn($this->data, "\x0A", $this->position); $this->reason = trim(substr($this->data, $this->position, $len), "\x09\x0D\x20"); $this->position += $len + 1; $this->state = 'new_line'; } /* * Deal with a new line, shifting data around as needed / protected function new_line() { $this->value = trim($this->value, "\x0D\x20"); if ($this->name !== '' && $this->value !== '') { $this->name = strtolower($this->name); // We should only use the last Content-Type header. c.f. issue #1 if (isset($this->headers[$this->name]) && $this->name !== 'content-type') { $this->headers[$this->name] .= ', ' . $this->value; } else { $this->headers[$this->name] = $this->value; } } $this->name = ''; $this->value = ''; if (substr($this->data[$this->position], 0, 2) === "\x0D\x0A") { $this->position += 2; $this->state = 'body'; } elseif ($this->data[$this->position] === "\x0A") { $this->position++; $this->state = 'body'; } else { $this->state = 'name'; } } /* * Parse a header name / protected function name() { $len = strcspn($this->data, "\x0A:", $this->position); if (isset($this->data[$this->position + $len])) { if ($this->data[$this->position + $len] === "\x0A") { $this->position += $len; $this->state = 'new_line'; } else { $this->name = substr($this->data, $this->position, $len); $this->position += $len + 1; $this->state = 'value'; } } else { $this->state = false; } } /* * Parse LWS, replacing consecutive LWS characters with a single space / protected function linear_whitespace() { do { if (substr($this->data, $this->position, 2) === "\x0D\x0A") { $this->position += 2; } elseif ($this->data[$this->position] === "\x0A") { $this->position++; } $this->position += strspn($this->data, "\x09\x20", $this->position); } while ($this->has_data() && $this->is_linear_whitespace()); $this->value .= "\x20"; } /* * See what state to move to while within non-quoted header values / protected function value() { if ($this->is_linear_whitespace()) { $this->linear_whitespace(); } else { switch ($this->data[$this->position]) { case '"': // Workaround for ETags: we have to include the quotes as // part of the tag. if (strtolower($this->name) === 'etag') { $this->value .= '"'; $this->position++; $this->state = 'value_char'; break; } $this->position++; $this->state = 'quote'; break; case "\x0A": $this->position++; $this->state = 'new_line'; break; default: $this->state = 'value_char'; break; } } } /* * Parse a header value while outside quotes / protected function value_char() { $len = strcspn($this->data, "\x09\x20\x0A\"", $this->position); $this->value .= substr($this->data, $this->position, $len); $this->position += $len; $this->state = 'value'; } /* * See what state to move to while within quoted header values / protected function quote() { if ($this->is_linear_whitespace()) { $this->linear_whitespace(); } else { switch ($this->data[$this->position]) { case '"': $this->position++; $this->state = 'value'; break; case "\x0A": $this->position++; $this->state = 'new_line'; break; case '\\': $this->position++; $this->state = 'quote_escaped'; break; default: $this->state = 'quote_char'; break; } } } /* * Parse a header value while within quotes / protected function quote_char() { $len = strcspn($this->data, "\x09\x20\x0A\"\\", $this->position); $this->value .= substr($this->data, $this->position, $len); $this->position += $len; $this->state = 'value'; } /* * Parse an escaped character within quotes / protected function quote_escaped() { $this->value .= $this->data[$this->position]; $this->position++; $this->state = 'quote'; } /* * Parse the body / protected function body() { $this->body = substr($this->data, $this->position); if (!empty($this->headers['transfer-encoding'])) { unset($this->headers['transfer-encoding']); $this->state = 'chunked'; } else { $this->state = 'emit'; } } /* * Parsed a "Transfer-Encoding: chunked" body / protected function chunked() { if (!preg_match('/^([0-9a-f]+)[^\r\n]\r\n/i', trim($this->body))) { $this->state = 'emit'; return; } $decoded = ''; $encoded = $this->body; while (true) { $is_chunked = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $encoded, $matches ); if (!$is_chunked) { // Looks like it's not chunked after all $this->state = 'emit'; return; } $length = hexdec(trim($matches[1])); if ($length === 0) { // Ignore trailer headers $this->state = 'emit'; $this->body = $decoded; return; } $chunk_length = strlen($matches[0]); $decoded .= $part = substr($encoded, $chunk_length, $length); $encoded = substr($encoded, $chunk_length + $length + 2); if (trim($encoded) === '0' \|\| empty($encoded)) { $this->state = 'emit'; $this->body = $decoded; return; } } } } Back

Edit File : Parser.php | Size : 10.63 KB

<?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 1.3.1
 * @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
 */

/**
 * HTTP Response Parser
 *
 * @package SimplePie
 * @subpackage HTTP
 */
class SimplePie_HTTP_Parser
{
	/**
	 * HTTP Version
	 *
	 * @var float
	 */
	public $http_version = 0.0;

/**
	 * Status code
	 *
	 * @var int
	 */
	public $status_code = 0;

/**
	 * Reason phrase
	 *
	 * @var string
	 */
	public $reason = '';

/**
	 * Key/value pairs of the headers
	 *
	 * @var array
	 */
	public $headers = array();

/**
	 * Body of the response
	 *
	 * @var string
	 */
	public $body = '';

/**
	 * Current state of the state machine
	 *
	 * @var string
	 */
	protected $state = 'http_version';

/**
	 * Input data
	 *
	 * @var string
	 */
	protected $data = '';

/**
	 * Input data length (to avoid calling strlen() everytime this is needed)
	 *
	 * @var int
	 */
	protected $data_length = 0;

/**
	 * Current position of the pointer
	 *
	 * @var int
	 */
	protected $position = 0;

/**
	 * Name of the hedaer currently being parsed
	 *
	 * @var string
	 */
	protected $name = '';

/**
	 * Value of the hedaer currently being parsed
	 *
	 * @var string
	 */
	protected $value = '';

/**
	 * Create an instance of the class with the input data
	 *
	 * @param string $data Input data
	 */
	public function __construct($data)
	{
		$this->data = $data;
		$this->data_length = strlen($this->data);
	}

/**
	 * Parse the input data
	 *
	 * @return bool true on success, false on failure
	 */
	public function parse()
	{
		while ($this->state && $this->state !== 'emit' && $this->has_data())
		{
			$state = $this->state;
			$this->$state();
		}
		$this->data = '';
		if ($this->state === 'emit' || $this->state === 'body')
		{
			return true;
		}
		else
		{
			$this->http_version = '';
			$this->status_code = '';
			$this->reason = '';
			$this->headers = array();
			$this->body = '';
			return false;
		}
	}

/**
	 * Check whether there is data beyond the pointer
	 *
	 * @return bool true if there is further data, false if not
	 */
	protected function has_data()
	{
		return (bool) ($this->position < $this->data_length);
	}

/**
	 * See if the next character is LWS
	 *
	 * @return bool true if the next character is LWS, false if not
	 */
	protected function is_linear_whitespace()
	{
		return (bool) ($this->data[$this->position] === "\x09"
			|| $this->data[$this->position] === "\x20"
			|| ($this->data[$this->position] === "\x0A"
				&& isset($this->data[$this->position + 1])
				&& ($this->data[$this->position + 1] === "\x09" || $this->data[$this->position + 1] === "\x20")));
	}

/**
	 * Parse the HTTP version
	 */
	protected function http_version()
	{
		if (strpos($this->data, "\x0A") !== false && strtoupper(substr($this->data, 0, 5)) === 'HTTP/')
		{
			$len = strspn($this->data, '0123456789.', 5);
			$this->http_version = substr($this->data, 5, $len);
			$this->position += 5 + $len;
			if (substr_count($this->http_version, '.') <= 1)
			{
				$this->http_version = (float) $this->http_version;
				$this->position += strspn($this->data, "\x09\x20", $this->position);
				$this->state = 'status';
			}
			else
			{
				$this->state = false;
			}
		}
		else
		{
			$this->state = false;
		}
	}

/**
	 * Parse the status code
	 */
	protected function status()
	{
		if ($len = strspn($this->data, '0123456789', $this->position))
		{
			$this->status_code = (int) substr($this->data, $this->position, $len);
			$this->position += $len;
			$this->state = 'reason';
		}
		else
		{
			$this->state = false;
		}
	}

/**
	 * Parse the reason phrase
	 */
	protected function reason()
	{
		$len = strcspn($this->data, "\x0A", $this->position);
		$this->reason = trim(substr($this->data, $this->position, $len), "\x09\x0D\x20");
		$this->position += $len + 1;
		$this->state = 'new_line';
	}

/**
	 * Deal with a new line, shifting data around as needed
	 */
	protected function new_line()
	{
		$this->value = trim($this->value, "\x0D\x20");
		if ($this->name !== '' && $this->value !== '')
		{
			$this->name = strtolower($this->name);
			// We should only use the last Content-Type header. c.f. issue #1
			if (isset($this->headers[$this->name]) && $this->name !== 'content-type')
			{
				$this->headers[$this->name] .= ', ' . $this->value;
			}
			else
			{
				$this->headers[$this->name] = $this->value;
			}
		}
		$this->name = '';
		$this->value = '';
		if (substr($this->data[$this->position], 0, 2) === "\x0D\x0A")
		{
			$this->position += 2;
			$this->state = 'body';
		}
		elseif ($this->data[$this->position] === "\x0A")
		{
			$this->position++;
			$this->state = 'body';
		}
		else
		{
			$this->state = 'name';
		}
	}

/**
	 * Parse a header name
	 */
	protected function name()
	{
		$len = strcspn($this->data, "\x0A:", $this->position);
		if (isset($this->data[$this->position + $len]))
		{
			if ($this->data[$this->position + $len] === "\x0A")
			{
				$this->position += $len;
				$this->state = 'new_line';
			}
			else
			{
				$this->name = substr($this->data, $this->position, $len);
				$this->position += $len + 1;
				$this->state = 'value';
			}
		}
		else
		{
			$this->state = false;
		}
	}

/**
	 * Parse LWS, replacing consecutive LWS characters with a single space
	 */
	protected function linear_whitespace()
	{
		do
		{
			if (substr($this->data, $this->position, 2) === "\x0D\x0A")
			{
				$this->position += 2;
			}
			elseif ($this->data[$this->position] === "\x0A")
			{
				$this->position++;
			}
			$this->position += strspn($this->data, "\x09\x20", $this->position);
		} while ($this->has_data() && $this->is_linear_whitespace());
		$this->value .= "\x20";
	}

/**
	 * See what state to move to while within non-quoted header values
	 */
	protected function value()
	{
		if ($this->is_linear_whitespace())
		{
			$this->linear_whitespace();
		}
		else
		{
			switch ($this->data[$this->position])
			{
				case '"':
					// Workaround for ETags: we have to include the quotes as
					// part of the tag.
					if (strtolower($this->name) === 'etag')
					{
						$this->value .= '"';
						$this->position++;
						$this->state = 'value_char';
						break;
					}
					$this->position++;
					$this->state = 'quote';
					break;

case "\x0A":
					$this->position++;
					$this->state = 'new_line';
					break;

default:
					$this->state = 'value_char';
					break;
			}
		}
	}

/**
	 * Parse a header value while outside quotes
	 */
	protected function value_char()
	{
		$len = strcspn($this->data, "\x09\x20\x0A\"", $this->position);
		$this->value .= substr($this->data, $this->position, $len);
		$this->position += $len;
		$this->state = 'value';
	}

/**
	 * See what state to move to while within quoted header values
	 */
	protected function quote()
	{
		if ($this->is_linear_whitespace())
		{
			$this->linear_whitespace();
		}
		else
		{
			switch ($this->data[$this->position])
			{
				case '"':
					$this->position++;
					$this->state = 'value';
					break;

case "\x0A":
					$this->position++;
					$this->state = 'new_line';
					break;

case '\\':
					$this->position++;
					$this->state = 'quote_escaped';
					break;

default:
					$this->state = 'quote_char';
					break;
			}
		}
	}

/**
	 * Parse a header value while within quotes
	 */
	protected function quote_char()
	{
		$len = strcspn($this->data, "\x09\x20\x0A\"\\", $this->position);
		$this->value .= substr($this->data, $this->position, $len);
		$this->position += $len;
		$this->state = 'value';
	}

/**
	 * Parse an escaped character within quotes
	 */
	protected function quote_escaped()
	{
		$this->value .= $this->data[$this->position];
		$this->position++;
		$this->state = 'quote';
	}

/**
	 * Parse the body
	 */
	protected function body()
	{
		$this->body = substr($this->data, $this->position);
		if (!empty($this->headers['transfer-encoding']))
		{
			unset($this->headers['transfer-encoding']);
			$this->state = 'chunked';
		}
		else
		{
			$this->state = 'emit';
		}
	}

/**
	 * Parsed a "Transfer-Encoding: chunked" body
	 */
	protected function chunked()
	{
		if (!preg_match('/^([0-9a-f]+)[^\r\n]*\r\n/i', trim($this->body)))
		{
			$this->state = 'emit';
			return;
		}

$decoded = '';
		$encoded = $this->body;

while (true)
		{
			$is_chunked = (bool) preg_match( '/^([0-9a-f]+)[^\r\n]*\r\n/i', $encoded, $matches );
			if (!$is_chunked)
			{
				// Looks like it's not chunked after all
				$this->state = 'emit';
				return;
			}

$length = hexdec(trim($matches[1]));
			if ($length === 0)
			{
				// Ignore trailer headers
				$this->state = 'emit';
				$this->body = $decoded;
				return;
			}

$chunk_length = strlen($matches[0]);
			$decoded .= $part = substr($encoded, $chunk_length, $length);
			$encoded = substr($encoded, $chunk_length + $length + 2);

if (trim($encoded) === '0' || empty($encoded))
			{
				$this->state = 'emit';
				$this->body = $decoded;
				return;
			}
		}
	}
}

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