Parser.php

gehe zur Dokumentation dieser Datei

<?php
class SimplePie_HTTP_Parser
{
        public $http_version = 0.0;

        public $status_code = 0;

        public $reason = '';

        public $headers = array();

        public $body = '';

        protected $state = 'http_version';

        protected $data = '';

        protected $data_length = 0;

        protected $position = 0;

        protected $name = '';

        protected $value = '';

        public function __construct($data)
        {
                $this->data = $data;
                $this->data_length = strlen($this->data);
        }

        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;
                }
        }

        protected function has_data()
        {
                return (bool) ($this->position < $this->data_length);
        }

        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")));
        }

        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;
                }
        }

        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;
                }
        }

        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';
        }

        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';
                }
        }

        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;
                }
        }

        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";
        }

        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;
                        }
                }
        }

        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';
        }

        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;
                        }
                }
        }

        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';
        }

        protected function quote_escaped()
        {
                $this->value .= $this->data[$this->position];
                $this->position++;
                $this->state = 'quote';
        }

        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';
                }
        }

        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;
                        }
                }
        }
}