--- /dev/null
+<?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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