<?php

function dump($v) {
  echo('<pre>' . var_export($v, true) . '</pre>');
}


error_reporting(E_ALL);

// header("http/1.0              404                \t\t\tNot Found\t");
// header("Content-Type:\t \t  text/plain;charset=windows-1251 =пизда%00;charset   \t\t\t\t= \"utf-8\" foo, bar");
header('cache-control: no-cache');
header('Cache-control: no-store'); // cache-control: no-store
// echo("Тест\n");

// list(, $h) = unpack('n', "\0\x20");
// print_r($h);

// $f = fopen('long_string.txt', 'r');
// echo(fgets($f, null));
// fgets($f, null);
// fgets($f);
// fread($f, 65536);
// var_dump(fread($f, 1));
// echo(fread($f, null));
// die;


// preg_match('~;\s*charset\s*=\s*(?:"([^"]+)"|([^\s;]+))~i', "text/html;  charset\t=   utf-8\t\"q;", $matches);
// var_dump($matches);
// echo('charset: ' . (count($matches) ? (isset($matches[2]) ? $matches[2] : $matches[1]) : ''));
// echo('\\\t\'\0 ');


preg_match_all('/[\x00-\xff]/', 'тест', $m);
// var_dump($m);

$headers = "HTTP/1.1 200\r\n" .
           "Content-Type:" .
           "\r\n\ttext/html;" .
           "\r\n\t charset=utf-8";

// echo("Headers:\n");
// echo(preg_replace('/\r\n[ \t]+/', ' ', $headers));
// Bad chars: \x00-\x08\x0b\x0c\x0e-\x1f\x7f

// set_time_limit(5);
// echo(str_repeat('-', 80) . PHP_EOL);

// list($a, $b) = explode(':', '');

// die;

if (!function_exists('http_build_url')) {
  function http_build_url($parts) {
    if (!is_array($parts)) {
      return false;
    }

    return (isset($parts['scheme']) ? $parts['scheme'] . '://' : '') .
      (isset($parts['user']) ?
        $parts['user'] .
        (isset($parts['pass']) ? ':' . $parts['pass'] : '') . '@'
        : '') .
      (isset($parts['host']) ? $parts['host']: '') .
      (isset($parts['port']) ? ':' . $parts['port']: '') .
      (isset($parts['path']) ?
        (substr($parts['path'], 0, 1) != '/' ? '/' : '') . $parts['path']
        : '') .
      (isset($parts['query']) ? '?' . $parts['query']: '') .
      (isset($parts['fragment']) ? '#' . $parts['fragment']: '');
  }
}

/*
echo(http_build_url([
  'user' => 'username',
  'host' => 'example.com',
  'path' => 'path/to/handler',
  'query' => 'query',
  'fragment' => 'hash'
]) . PHP_EOL);

echo(http_build_url([
  'scheme' => 'https',
  'user' => 'username',
  'pass' => 'password',
  'host' => 'example.com',
  'path' => 'path/to/handler',
  'query' => 'query',
  'fragment' => 'hash'
]) . PHP_EOL);

$u = 'google.com:8080/path/to/handler?#';
echo('Исходный URL: ' . $u . PHP_EOL);
$p = parse_url($u);
echo("Результат парсинга: ");
print_r($p);
echo('Результат http_build_url(): ' . http_build_url($p) . PHP_EOL);*/

/* Класс для работы с HTTP-соединением. */
class HTTPConnection {
  const PORT = 80;
  const SSL_PORT = 443;
  const CONNECTION_TIMEOUT = 10;
  const TIMEOUT = 10;

  protected $hostname;
  protected $port;
  protected $ssl;
  protected $connectionTimeout;
  protected $timeout;
  protected $socket;

  public function __construct($hostname, $port = null, $ssl = false, $connection_timeout = null, $timeout = null) {
    $this->hostname = $hostname;
    $this->ssl = $ssl;
    $this->port = is_null($port) ? ($this->ssl ? static::SSL_PORT : static::PORT) : $port;
    $this->connectionTimeout = is_null($connection_timeout) ? static::CONNECTION_TIMEOUT : $connection_timeout;
    $this->timeout = is_null($timeout) ? static::TIMEOUT : $timeout;
    $this->connect();
  }

  public function getHostname() {
    return $this->hostname;
  }

  public function getSsl() {
    return $this->ssl;
  }

  public function getPort() {
    return $this->port;
  }

  public function getConnectionTimeout() {
    return $this->connectionTimeout;
  }

  public function getTimeout() {
    return $this->timeout;
  }

  public function request($method, $uri, $http_version = '1.1', $headers = array(), $data = '') {
    $request = "$method $uri HTTP/$http_version\r\n";

    foreach ($headers as $k => $v) {
      $request .= "$k: $v\r\n";
    }

    $request .= "\r\n$data";
    $this->write($request);
  }

  public function write($data) {
    $bytes = @fwrite($this->socket, $data);

    if ($bytes === false) {
      $this->checkTimeout();
      throw new SocketError('Could not write to socket');
    }

    return $bytes;
  }

  public function read($size) {
    // Если достигли конца файла, вернет пустую строку. Только в случае ошибки возвращает false
    $data = @fread($this->socket, $size);

    if ($data === false) {
      $this->checkTimeout();
      throw new SocketError('Could not read from socket');
    }

    return $data;
  }

  public function readLine($size = null) {
    if (is_null($size)) {
      // fgets($fp, null) приводит к ошибке
      // Читает строку пока не встретит \n либо конец файла
      $data = @fgets($this->socket);
    } else {
      $data = @fgets($this->socket, $size);
    }

    if ($data === false) {
      $this->checkTimeout();
      throw new SocketError('Could not read from socket');
    }

    return $data;
  }

  public function eof() {
    return @feof($this->socket);
  }

  public function getStreamMetaData() {
    // Вернет false, если ресурс закрыт
    return @stream_get_meta_data($this->socket);
  }

  public function isConnected() {
    return is_resource($this->socket);
  }

  public function disconnect() {
    // <br />
    // <b>Warning</b>:  fclose(): 4 is not a valid stream resource in <b>...</b><br />
    @fclose($this->socket);
  }

  public function __destruct() {
    $this->disconnect();
  }

  protected function connect() {
    $hostname = ($this->ssl ? 'ssl' : 'tcp') ? '://' . $this->hostname;
    $this->socket = @fsockopen($hostname, $this->port, $errno, $errstr, $this->connectionTimeout);

    if (!$this->socket) {
      // Функции типа socket_last_error отключены по-умолчанию
      throw new SocketError("Socket error $errno: $errstr");
    }

    // http://forum.sources.ru/index.php?showtopic=88374
    // stream_set_blocking($this->socket, true);
    // timeout на чтение/запись в сокет
    stream_set_timeout($this->socket, $this->timeout);
  }

  protected function checkTimeout() {
    $info = $this->getStreamMetaData();

    if ($info && $info['timed_out']) {
      throw new SocketTimeout('Socket timed out');
    }
  }
}

class SocketError extends Exception {}


class SocketTimeot extends SocketError {}


class Header {
  protected $name;
  protected $value;

  public function __construct($name, $value) {
    $this->setName($name);
    $this->setValue($value);
  }

  public function setName($name) {
    $this->name = $name;
  }

  public function setValue($value) {
    $this->value = $value;
  }

  public function getName() {
    return $this->name;
  }

  public function getValue() {
    return $this->value;
  }

  public function __toString() {
    return sprintf('%s: %s', $this->name,  $this->value);
  }
}


/**
  * Класс для работы с http-заголовками.
  *
  * Имена полей регистронезависимы. Значения полей можно получить, обращаясь к
  * объекту как к массиву. К объекту применимы вызовы функций count, isset и
  * unset, а так же возможен по нему обход с помощью цикла foreach.
  */
class Headers implements ArrayAccess, Countable, IteratorAggregate {
  protected $headers = array();

  public function __construct($headers = array()) {
    $this->update($headers);
  }

  /**
    * Добавляет новый заголовок.
    */
  public function add($name, $value) {
    $this->headers[strtolower($name)] = new Header($name, $value);
  }

  /**
    * Добавляет новый заголовок либо заменяет значение существующего, при этом
    * оригинальное имя сохраняется.
    */
  public function set($name, $value) {
    $lower_name = strtolower($name);

    if (isset($this->headers[$lower_name])) {
      $this->headers[$lower_name]->setValue($value);
    } else {
      $this->headers[$lower_name] = new Header($name, $value);
    }

    // возвращаем установленное значение
    return $value;
  }

  public function update($data) {
    foreach ($data as $name => $value) {
      $this->set($name, $value);
    }
  }

  public function get($name, $default = null) {
    $name = strtolower($name);
    return isset($this->headers[$name]) ? $this->headers[$name]->getValue() : $default;
  }

  /**
    * Возвращает оригинальное имя заголовка.
    */
  public function getOriginalName($name) {
    $name = strtolower($name);

    if (isset($this->headers[$name])) {
      return $this->headers[$name]->getName();
    }
  }

  public function has($name) {
    return isset($this->headers[strtolower($name)]);
  }

  public function remove($name) {
    unset($this->headers[strtolower($name)]);
  }

  public function toArray() {
    $headers = array();

    foreach ($this->headers as $header) {
      $headers[$header->getName()] = $header->getValue();
    }

    return $headers;
  }

  public function __toString() {
    $out = '';

    foreach ($this->headers as $header) {
      $out .= $header->__toString() . "\r\n";
    }

    return $out;
  }

  public function __clone() {
    foreach ($this->headers as &$h) {
      $h = clone $h;
    }
  }

  public static function parse($header_str) {
    // new self будет создавать экземпляр класса, где был объявлен метод
    $headers = new static;

    if (strlen($header_str)) {
      // normalize LWS
      $header_str = preg_replace('/\r\n[\x20\t]+/', ' ', $header_str);
      $offset = 0;
      $length = strlen($header_str);

      while (true) {
        $pos = strpos($header_str, "\r\n", $offset);

        if ($pos === false) {
          throw new MalformedHeaderError('Header should end with CRLF');
        }

        $line = substr($header_str, $offset, $pos - $offset);
        $parts = explode(':', $line, 2);

        if (count($parts) < 2) {
          throw new MalformedHeaderError('Header without colon');
        }

        list($name, $value) = $parts;
        $value = trim($value);

        if (isset($headers[$name])) {
          // по rfc заголовки с одинаковыми либо различающимися лишь регистром
          // именами могут быть объеденены в один. Их значения должны быть
          // добавлены к значениям первого заголовка и разделены запятыми.
          //
          // Пример:
          //
          // Cache-Control: no-cache
          // cache-control: no-store
          //
          // После нормализации:
          //
          // Cache-Control: no-cache, no-store
          $headers[$name] .= ', ' . $value;
        } else {
          $headers[$name] = $value;
        }

        $offset = $pos + 2;

        if ($offset == $length) {
          break;
        }
      }
    }

    return $headers;
  }

  public function offsetSet($offset, $value) {
    return $this->set($offset, $value);
  }

  public function offsetExists($offset) {
    return $this->has($offset);
  }

  public function offsetUnset($offset) {
    $this->remove($offset);
  }

  public function offsetGet($offset) {
    return $this->get($offset);
  }

  public function count() {
    return count($this->headers);
  }

  public function getIterator() {
    return new ArrayIterator($this->toArray());
  }
}

class MalformedHeaderError extends Exception {}


// за основу взят этот код:
// https://github.com/square/okhttp/blob/master/okhttp/src/main/java/okhttp3/MediaType.java
// там неправильная регулярка для токенов
// http://rfc2.ru/2068.rfc/6#p2.2
class MediaType {
  const TOKEN_RE = '([!#$%&\'*+-.^`|~\w]+)';
  // quoted-string  = ( <"> *(qdtext) <"> )
  // qdtext         = <любой TEXT не включающий <">>
  const QUOTED_RE = '"([^"]*)"';

  protected $mediaType;
  protected $type;
  protected $subtype;
  protected $parameters;

  public function __construct($str) {
    $this->mediaType = $str;
    $this->parse();
  }

  public function getMediaType() {
    return $this->mediaType;
  }

  public function getType() {
    return $this->type;
  }

  public function getSubtype() {
    return $this->subtype;
  }

  public function getMimeType() {
    return sprintf('%s/%s', $this->type, $this->subtype);
  }

  public function getParameter($name, $default = null) {
    $name = strtolower($name);

    if (isset($this->parameters[$name])) {
      return $this->parameters[$name];
    }

    return $default;
  }

  public function getParameters() {
    return $this->parameters;
  }

  public function hasParameter($name) {
    return isset($this->parameters[strtolower($name)]);
  }

  public function __toString() {
    return $this->mediaType;
  }

  protected function parse() {
    // media-type     = type "/" subtype *( ";" parameter )
    // type           = token
    // subtype        = token
    $media_type_re = '/^\s*' . static::TOKEN . '\/' . static::TOKEN . '\s*(?=;|$)/';
    // echo($media_type_re . PHP_EOL);
    // parameter      = attribute "=" value
    // attribute      = token
    // value          = token | quoted-string
    $parameter_re = '/^;\s*' . static::TOKEN . '\s*=\s*(?:' . static::TOKEN . '|' . static::QUOTED . ')\s*/';
    // echo($parameter_re . PHP_EOL);

    if (!preg_match($media_type_re, $this->mediaType, $matches)) {
      throw new MediaTypeError('Invalid media type');
    }

    $this->type = strtolower($matches[1]);
    $this->subtype = strtolower($matches[2]);
    $offset = strlen($matches[0]);
    $str = $this->mediaType;

    while ($offset < strlen($str)) {
      $str = substr($str, $offset);

      if (!preg_match($parameter_re, $str, $matches)) {
        // throw new MediaTypeError('Invalid parameter');
        // прекращаем парсинг
        break;
      }

      // print_r($matches);
      $offset = strlen($matches[0]);
      $name = strtolower($matches[1]);
      $value = isset($matches[3]) ? $this->unquote($matches[3]) : $matches[2];
      $this->parameters[$name] = $value;
    }
  }

  protected function unquote($v) {
    // TODO: сделать замену escape-последовательностей
    return $v;
  }
}


class MediaTypeError extends Exception {}


class Request {
  const SCHEME_RE = '/^https?$/i';

  // объявим публичными чтобы не писать кучу методов типа getFoo, setFoo
  public $connectionTimeout;
  public $timeout;

  protected $defaultHeaders = array(
    'Accept' => '*/*',
    'Accept-Encoding' => 'gzip, deflate',
    'User-Agent' => 'Mozilla/5.0'
  );

  protected $method;
  protected $url;
  protected $username;
  protected $password;
  protected $headers;

  public function __construct($method, $url, $username = null, $password = null) {
    $this->method = $method;
    $this->url = $url;
    $this->username = $username;
    $this->password = $password;
    $this->headers = new Headers($this->defaultHeaders);
  }

  public function setHeader($name, $value) {
     $this->headers[$name] = $value;
  }

  public function send($data = '') {
    $url = parse_url($this->url);

    if ($url === false || !isset($url['scheme']) || !isset($url['host'])) {
      throw new RequestError('Bad URL');
    }

    $scheme = $url['scheme'];

    if (!preg_match(static::SCHEME_RE, $scheme)) {
      throw new RequestError(sprintf('Unsupported scheme: %s', $scheme));
    }

    $hostname = $url['host'];
    $port = isset($url['port']) ? $url['port'] : null;
    $class = strtoupper($scheme) . 'Connection';
    $connection = new $class($hostname, $port, $this->connectionTimeout, $this->timeout);
    $endpoint = isset($url['path']) ? $url['path'] : '/';

    if (isset($url['query'])) {
      $endpoint .= '?' . $url['query'];
    }

    $headers = clone $this->headers;

    // if (isset($url['user'])) {
    //   $username = $url['user'];
    //   $password = isset($url['pass']) ? $url['pass'] : '';
    //   $headers['Authorization'] = 'Basic ' . base64_encode($username . ':' . $password);
    // }

    if (!is_null($this->username)) {
      $headers['Authorization'] = 'Basic ' . base64_encode(sprintf('%s:%s', $this->username, $this->password));
    }

    $content_length = strlen($data);

    if ($content_length) {
      $headers['Content-Length'] = $content_length;
    }

    $connection->request($this->method, $endpoint, $headers, $data);
    return new Response($connection, $this->url);
  }
}


class RequestError extends Exception {}


class Response {
  const STATUS_RE = '/^HTTP\/(\d\.\d) ([1-5]\d\d) (.*)/';
  const CHUNK_RE = '/^[a-fA-F0-9]+(?=;|\r\n)/';
  const NUM_RE = '/^(0|[1-9]\d*)$/';
  const STATUS_LENGTH = 128;
  const HEADER_LENGTH = 4096;
  const READ_SIZE = 4096;

  public $url;
  public $httpVersion;
  public $statusCode;
  public $reasonPhrase;
  public $mimeType = '';
  public $mainType = '';
  public $subType = '';
  public $charset = '';

  protected $connection;
  protected $headers;
  protected $content;

  public function __construct($connection, $url) {
    $this->connection = $connection;
    $this->url = $url;
    $this->processResponse();
  }

  public function getContent() {
    if (!is_null($this->content)) {
      return $this->content;
    }

    // print_r($this->headers);
    $content = '';
    // Если установлен Transfer-Encoding Content-Length игнорируется.
    // If a Content-Length header field (section 14.13) is present, its decimal
    // value in OCTETs represents both the entity-length and the transfer-length.
    // The Content-Length header field MUST NOT be sent if these two lengths are
    // different (i.e., if a Transfer-Encoding header field is present). If a
    // message is received with both a Transfer-Encoding header field and a
    // Content-Length header field, the latter MUST be ignored.
    if (isset($this->headers['transfer-encoding'])) {
      $enc = strtolower($this->headers['transfer-encoding']);

      if ($enc != 'chunked') {
        throw new ResponseError(sprintf('Unsupported transfer-encoding: %s', $enc));
      }

      for (;;) {
        $chunk = $this->connection->readLine();

        if (!preg_match(static::CHUNK_RE, $chunk, $matches)) {
          throw new ResponseError('Invalid chunk');
        }

        $size = hexdec($matches[0]);

        if (!$size) {
          break;
        }

        $content .= $this->connection->read($size);
        // trailer CRLF
        $this->connection->readLine();
      }
    } else {
      if (isset($this->headers['content-length'])) {
        if (!preg_match(static::NUM_RE, $this->headers['content-length'])) {
          throw new Exception('Invalid content-length');
        }

        // читаем количество байт указанных в заголовке
        $length = intval($this->headers['content-length']);

        if ($length) {
          $content = $this->connection->read($length);
        }
      } else {
        // Если заголовок Content-Length не установлен, клиент должен читать из
        // сокета, пока не будет разорвано соединение
        while (!$this->connection->eof()) {
          $content .= $this->connection->read(static::READ_SIZE);
        }
      }
    }

    // Если были переданы Transfer-Encoding и Content-Encoding, то мы сначала
    // собираем собираем строку из чанков, а только потом декодируем
    if (isset($this->headers['content-encoding'])) {
      $enc = strtolower($this->headers['content-encoding']);
      $decoded = $this->decodeContent($content, $enc);

      if ($decoded === false) {
        throw new ResponseError(sprintf('Unable to decode content with content-encoding: %s', $enc));
      }

      $content = $decoded;
    }

    $this->closeConnection();
    return $this->content = $content;
  }

  public function getHeaders() {
    return clone $this->headers;
  }

  public function __destruct() {
    $this->closeConnection();
  }

  protected function processResponse() {
    $line = $this->connection->readLine(static::STATUS_LENGTH);

    if (!preg_match(static::STATUS_RE, $line, $matches)) {
      throw new Exception('Invalid status line');
    }

    $this->httpVersion = $matches[1];
    $this->statusCode = intval($matches[2]);
    $this->reasonPhrase = $matches[3];
    $header = '';

    while (!$this->connection->eof()) {
      $line = $this->connection->readLine(static::HEADER_LENGTH);

      if ($line == "\r\n") {
        break;
      }

      $header .= $line;
    }

    $this->headers = Headers::parse($header);

    if (isset($this->headers['content-type'])) {
      try {
        $mt = new MediaType($this->headers['content-type']);
        $this->mimeType = $mt->getFullType();
        $this->mainType = $mt->getType();
        $this->subType = $mt->getSubType();
        $this->charset = $mt->getParameter('charset', $this->charset);
      } catch (Exception $e) {}
    }
  }

  protected function decodeContent($content, $encoding) {
    // $encoding = strtolower($encoding);

    if ($encoding == 'identity') {
      return $content;
    }

    if ($encoding == 'gzip') {
      // http://php.net/manual/ru/function.gzinflate.php#77336
      // Про флаги тут:
      // http://www.forensicswiki.org/wiki/Gzip

      if (substr($content, 0, 3) == "\x1f\x8b\x08") {
        $offset = 10;
        $flags = ord(substr($content, 3, 1));

        if ($flags) {
          if ($flags & 0x04) {
            list($extra_length) = unpack('v',substr($content, $offset, 2));
            $offset += 2 + $extra_length;
          }

          if ($flags & 0x08) {
            $offset = strpos($content, "\0", $offset) + 1;
          }

          if ($flags & 0x10) {
            $offset = strpos($content, "\0", $offset) + 1;
          }

          if ($flags & 0x02) {
            $offset += 2;
          }
        }

        return @gzinflate(substr($content, $offset, -8));
      }
    } else if ($encoding == 'deflate') {
      // https://github.com/zendframework/zend-http/blob/master/src/Response.php
      // first byte is usually 0x78 but can also be 0x08,
      // 0x18, 0x28, 0x38, 0x48, 0x58, or 0x68.  The first two bytes, when
      // interpreted as an unsigned 16-bit number in big-endian byte order,
      // contain a value that is a multiple of 31.
      $zlib_header = unpack('n', substr($content, 0, 2));
      // print_r($zlib_header);

      if ($zlib_header[1] % 31 == 0) {
        return @gzuncompress($content);
      }

      return @gzinflate($content);
    }

    return false;
  }

  protected function closeConnection() {
    $this->connection->close();
  }
}


class ResponseError extends Exception {}

// https://httpbin.org/gzip
// https://httpbin.org/deflate
// http://www.gbase.de/global/news/0/55322.html
// https://www.httpwatch.com/httpgallery/chunked/chunkedimage.aspx

$request = new Request('GET', 'http://xseeds.net');
$response = $request->send();
// print_r($response->getHeaders()->toArray());
$headers = $response->getHeaders();
// header('Content-Type: ' . $headers['content-type']);
echo($response->getContent());