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Edit File : Socket.php \| Size : 19.74 KB
<?php /** * Net_Socket * * PHP Version 4 * * Copyright (c) 1997-2013 The PHP Group * * This source file is subject to version 2.0 of the PHP license, * that is bundled with this package in the file LICENSE, and is * available at through the world-wide-web at * http://www.php.net/license/2_02.txt. * If you did not receive a copy of the PHP license and are unable to * obtain it through the world-wide-web, please send a note to * license@php.net so we can mail you a copy immediately. * * Authors: Stig Bakken <ssb@php.net> * Chuck Hagenbuch <chuck@horde.org> * * @category Net * @package Net_Socket * @author Stig Bakken <ssb@php.net> * @author Chuck Hagenbuch <chuck@horde.org> * @copyright 1997-2003 The PHP Group * @license http://www.php.net/license/2_02.txt PHP 2.02 * @link http://pear.php.net/packages/Net_Socket / require_once 'PEAR.php'; define('NET_SOCKET_READ', 1); define('NET_SOCKET_WRITE', 2); define('NET_SOCKET_ERROR', 4); /* * Generalized Socket class. * * @category Net * @package Net_Socket * @author Stig Bakken <ssb@php.net> * @author Chuck Hagenbuch <chuck@horde.org> * @copyright 1997-2003 The PHP Group * @license http://www.php.net/license/2_02.txt PHP 2.02 * @link http://pear.php.net/packages/Net_Socket / class Net_Socket extends PEAR { /* * Socket file pointer. * @var resource $fp / var $fp = null; /* * Whether the socket is blocking. Defaults to true. * @var boolean $blocking / var $blocking = true; /* * Whether the socket is persistent. Defaults to false. * @var boolean $persistent / var $persistent = false; /* * The IP address to connect to. * @var string $addr / var $addr = ''; /* * The port number to connect to. * @var integer $port / var $port = 0; /* * Number of seconds to wait on socket operations before assuming * there's no more data. Defaults to no timeout. * @var integer\|float $timeout / var $timeout = null; /* * Number of bytes to read at a time in readLine() and * readAll(). Defaults to 2048. * @var integer $lineLength / var $lineLength = 2048; /* * The string to use as a newline terminator. Usually "\r\n" or "\n". * @var string $newline / var $newline = "\r\n"; /* * Connect to the specified port. If called when the socket is * already connected, it disconnects and connects again. * * @param string $addr IP address or host name (may be with protocol prefix). * @param integer $port TCP port number. * @param boolean $persistent (optional) Whether the connection is * persistent (kept open between requests * by the web server). * @param integer $timeout (optional) Connection socket timeout. * @param array $options See options for stream_context_create. * * @access public * * @return boolean\|PEAR_Error True on success or a PEAR_Error on failure. / function connect($addr, $port = 0, $persistent = null, $timeout = null, $options = null) { if (is_resource($this->fp)) { @fclose($this->fp); $this->fp = null; } if (!$addr) { return $this->raiseError('$addr cannot be empty'); } else if (strspn($addr, ':.0123456789') == strlen($addr)) { $this->addr = strpos($addr, ':') !== false ? '['.$addr.']' : $addr; } else { $this->addr = $addr; } $this->port = $port % 65536; if ($persistent !== null) { $this->persistent = $persistent; } $openfunc = $this->persistent ? 'pfsockopen' : 'fsockopen'; $errno = 0; $errstr = ''; $old_track_errors = @ini_set('track_errors', 1); if ($timeout <= 0) { $timeout = @ini_get('default_socket_timeout'); } if ($options && function_exists('stream_context_create')) { $context = stream_context_create($options); // Since PHP 5 fsockopen doesn't allow context specification if (function_exists('stream_socket_client')) { $flags = STREAM_CLIENT_CONNECT; if ($this->persistent) { $flags = STREAM_CLIENT_PERSISTENT; } $addr = $this->addr . ':' . $this->port; $fp = stream_socket_client($addr, $errno, $errstr, $timeout, $flags, $context); } else { $fp = @$openfunc($this->addr, $this->port, $errno, $errstr, $timeout, $context); } } else { $fp = @$openfunc($this->addr, $this->port, $errno, $errstr, $timeout); } if (!$fp) { if ($errno == 0 && !strlen($errstr) && isset($php_errormsg)) { $errstr = $php_errormsg; } @ini_set('track_errors', $old_track_errors); return $this->raiseError($errstr, $errno); } @ini_set('track_errors', $old_track_errors); $this->fp = $fp; $this->setTimeout(); return $this->setBlocking($this->blocking); } /* * Disconnects from the peer, closes the socket. * * @access public * @return mixed true on success or a PEAR_Error instance otherwise / function disconnect() { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } @fclose($this->fp); $this->fp = null; return true; } /* * Set the newline character/sequence to use. * * @param string $newline Newline character(s) * @return boolean True / function setNewline($newline) { $this->newline = $newline; return true; } /* * Find out if the socket is in blocking mode. * * @access public * @return boolean The current blocking mode. / function isBlocking() { return $this->blocking; } /* * Sets whether the socket connection should be blocking or * not. A read call to a non-blocking socket will return immediately * if there is no data available, whereas it will block until there * is data for blocking sockets. * * @param boolean $mode True for blocking sockets, false for nonblocking. * * @access public * @return mixed true on success or a PEAR_Error instance otherwise / function setBlocking($mode) { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } $this->blocking = $mode; stream_set_blocking($this->fp, (int)$this->blocking); return true; } /* * Sets the timeout value on socket descriptor, * expressed in the sum of seconds and microseconds * * @param integer $seconds Seconds. * @param integer $microseconds Microseconds, optional. * * @access public * @return mixed True on success or false on failure or * a PEAR_Error instance when not connected / function setTimeout($seconds = null, $microseconds = null) { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } if ($seconds === null && $microseconds === null) { $seconds = (int) $this->timeout; $microseconds = (int) (($this->timeout - $seconds) 1000000); } else { $this->timeout = $seconds + $microseconds/1000000; } if ($this->timeout > 0) { return stream_set_timeout($this->fp, (int) $seconds, (int) $microseconds); } else { return false; } } /** * Sets the file buffering size on the stream. * See php's stream_set_write_buffer for more information. * * @param integer $size Write buffer size. * * @access public * @return mixed on success or an PEAR_Error object otherwise / function setWriteBuffer($size) { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } $returned = stream_set_write_buffer($this->fp, $size); if ($returned == 0) { return true; } return $this->raiseError('Cannot set write buffer.'); } /* * Returns information about an existing socket resource. * Currently returns four entries in the result array: * * <p> * timed_out (bool) - The socket timed out waiting for data<br> * blocked (bool) - The socket was blocked<br> * eof (bool) - Indicates EOF event<br> * unread_bytes (int) - Number of bytes left in the socket buffer<br> * </p> * * @access public * @return mixed Array containing information about existing socket * resource or a PEAR_Error instance otherwise / function getStatus() { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } return stream_get_meta_data($this->fp); } /* * Get a specified line of data * * @param int $size Reading ends when size - 1 bytes have been read, * or a newline or an EOF (whichever comes first). * If no size is specified, it will keep reading from * the stream until it reaches the end of the line. * * @access public * @return mixed $size bytes of data from the socket, or a PEAR_Error if * not connected. If an error occurs, FALSE is returned. / function gets($size = null) { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } if (is_null($size)) { return @fgets($this->fp); } else { return @fgets($this->fp, $size); } } /* * Read a specified amount of data. This is guaranteed to return, * and has the added benefit of getting everything in one fread() * chunk; if you know the size of the data you're getting * beforehand, this is definitely the way to go. * * @param integer $size The number of bytes to read from the socket. * * @access public * @return $size bytes of data from the socket, or a PEAR_Error if * not connected. / function read($size) { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } return @fread($this->fp, $size); } /* * Write a specified amount of data. * * @param string $data Data to write. * @param integer $blocksize Amount of data to write at once. * NULL means all at once. * * @access public * @return mixed If the socket is not connected, returns an instance of * PEAR_Error. * If the write succeeds, returns the number of bytes written. * If the write fails, returns false. * If the socket times out, returns an instance of PEAR_Error. / function write($data, $blocksize = null) { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } if (is_null($blocksize) && !OS_WINDOWS) { $written = @fwrite($this->fp, $data); // Check for timeout or lost connection if (!$written) { $meta_data = $this->getStatus(); if (!is_array($meta_data)) { return $meta_data; // PEAR_Error } if (!empty($meta_data['timed_out'])) { return $this->raiseError('timed out'); } } return $written; } else { if (is_null($blocksize)) { $blocksize = 1024; } $pos = 0; $size = strlen($data); while ($pos < $size) { $written = @fwrite($this->fp, substr($data, $pos, $blocksize)); // Check for timeout or lost connection if (!$written) { $meta_data = $this->getStatus(); if (!is_array($meta_data)) { return $meta_data; // PEAR_Error } if (!empty($meta_data['timed_out'])) { return $this->raiseError('timed out'); } return $written; } $pos += $written; } return $pos; } } /* * Write a line of data to the socket, followed by a trailing newline. * * @param string $data Data to write * * @access public * @return mixed fwrite() result, or PEAR_Error when not connected / function writeLine($data) { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } return fwrite($this->fp, $data . $this->newline); } /* * Tests for end-of-file on a socket descriptor. * * Also returns true if the socket is disconnected. * * @access public * @return bool / function eof() { return (!is_resource($this->fp) \|\| feof($this->fp)); } /* * Reads a byte of data * * @access public * @return 1 byte of data from the socket, or a PEAR_Error if * not connected. / function readByte() { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } return ord(@fread($this->fp, 1)); } /* * Reads a word of data * * @access public * @return 1 word of data from the socket, or a PEAR_Error if * not connected. / function readWord() { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } $buf = @fread($this->fp, 2); return (ord($buf[0]) + (ord($buf[1]) << 8)); } /* * Reads an int of data * * @access public * @return integer 1 int of data from the socket, or a PEAR_Error if * not connected. / function readInt() { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } $buf = @fread($this->fp, 4); return (ord($buf[0]) + (ord($buf[1]) << 8) + (ord($buf[2]) << 16) + (ord($buf[3]) << 24)); } /* * Reads a zero-terminated string of data * * @access public * @return string, or a PEAR_Error if * not connected. / function readString() { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } $string = ''; while (($char = @fread($this->fp, 1)) != "\x00") { $string .= $char; } return $string; } /* * Reads an IP Address and returns it in a dot formatted string * * @access public * @return Dot formatted string, or a PEAR_Error if * not connected. / function readIPAddress() { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } $buf = @fread($this->fp, 4); return sprintf('%d.%d.%d.%d', ord($buf[0]), ord($buf[1]), ord($buf[2]), ord($buf[3])); } /* * Read until either the end of the socket or a newline, whichever * comes first. Strips the trailing newline from the returned data. * * @access public * @return All available data up to a newline, without that * newline, or until the end of the socket, or a PEAR_Error if * not connected. / function readLine() { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } $line = ''; $timeout = time() + $this->timeout; while (!feof($this->fp) && (!$this->timeout \|\| time() < $timeout)) { $line .= @fgets($this->fp, $this->lineLength); if (substr($line, -1) == "\n") { return rtrim($line, $this->newline); } } return $line; } /* * Read until the socket closes, or until there is no more data in * the inner PHP buffer. If the inner buffer is empty, in blocking * mode we wait for at least 1 byte of data. Therefore, in * blocking mode, if there is no data at all to be read, this * function will never exit (unless the socket is closed on the * remote end). * * @access public * * @return string All data until the socket closes, or a PEAR_Error if * not connected. / function readAll() { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } $data = ''; while (!feof($this->fp)) { $data .= @fread($this->fp, $this->lineLength); } return $data; } /* * Runs the equivalent of the select() system call on the socket * with a timeout specified by tv_sec and tv_usec. * * @param integer $state Which of read/write/error to check for. * @param integer $tv_sec Number of seconds for timeout. * @param integer $tv_usec Number of microseconds for timeout. * * @access public * @return False if select fails, integer describing which of read/write/error * are ready, or PEAR_Error if not connected. / function select($state, $tv_sec, $tv_usec = 0) { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } $read = null; $write = null; $except = null; if ($state & NET_SOCKET_READ) { $read[] = $this->fp; } if ($state & NET_SOCKET_WRITE) { $write[] = $this->fp; } if ($state & NET_SOCKET_ERROR) { $except[] = $this->fp; } if (false === ($sr = stream_select($read, $write, $except, $tv_sec, $tv_usec))) { return false; } $result = 0; if (count($read)) { $result \|= NET_SOCKET_READ; } if (count($write)) { $result \|= NET_SOCKET_WRITE; } if (count($except)) { $result \|= NET_SOCKET_ERROR; } return $result; } /* * Turns encryption on/off on a connected socket. * * @param bool $enabled Set this parameter to true to enable encryption * and false to disable encryption. * @param integer $type Type of encryption. See stream_socket_enable_crypto() * for values. * * @see http://se.php.net/manual/en/function.stream-socket-enable-crypto.php * @access public * @return false on error, true on success and 0 if there isn't enough data * and the user should try again (non-blocking sockets only). * A PEAR_Error object is returned if the socket is not * connected */ function enableCrypto($enabled, $type) { if (version_compare(phpversion(), "5.1.0", ">=")) { if (!is_resource($this->fp)) { return $this->raiseError('not connected'); } return @stream_socket_enable_crypto($this->fp, $enabled, $type); } else { $msg = 'Net_Socket::enableCrypto() requires php version >= 5.1.0'; return $this->raiseError($msg); } } } Back

Edit File : Socket.php | Size : 19.74 KB

<?php
/**
 * Net_Socket
 *
 * PHP Version 4
 *
 * Copyright (c) 1997-2013 The PHP Group
 *
 * This source file is subject to version 2.0 of the PHP license,
 * that is bundled with this package in the file LICENSE, and is
 * available at through the world-wide-web at
 * http://www.php.net/license/2_02.txt.
 * If you did not receive a copy of the PHP license and are unable to
 * obtain it through the world-wide-web, please send a note to
 * license@php.net so we can mail you a copy immediately.
 *
 * Authors: Stig Bakken <ssb@php.net>
 * Chuck Hagenbuch <chuck@horde.org>
 *
 * @category Net
 * @package Net_Socket
 * @author Stig Bakken <ssb@php.net>
 * @author Chuck Hagenbuch <chuck@horde.org>
 * @copyright 1997-2003 The PHP Group
 * @license http://www.php.net/license/2_02.txt PHP 2.02
 * @link http://pear.php.net/packages/Net_Socket
 */

require_once 'PEAR.php';

define('NET_SOCKET_READ', 1);
define('NET_SOCKET_WRITE', 2);
define('NET_SOCKET_ERROR', 4);

/**
 * Generalized Socket class.
 *
 * @category Net
 * @package Net_Socket
 * @author Stig Bakken <ssb@php.net>
 * @author Chuck Hagenbuch <chuck@horde.org>
 * @copyright 1997-2003 The PHP Group
 * @license http://www.php.net/license/2_02.txt PHP 2.02
 * @link http://pear.php.net/packages/Net_Socket
 */
class Net_Socket extends PEAR
{
 /**
 * Socket file pointer.
 * @var resource $fp
 */
 var $fp = null;

/**
     * Whether the socket is blocking. Defaults to true.
     * @var boolean $blocking
     */
    var $blocking = true;

/**
     * Whether the socket is persistent. Defaults to false.
     * @var boolean $persistent
     */
    var $persistent = false;

/**
     * The IP address to connect to.
     * @var string $addr
     */
    var $addr = '';

/**
     * The port number to connect to.
     * @var integer $port
     */
    var $port = 0;

/**
     * Number of seconds to wait on socket operations before assuming
     * there's no more data. Defaults to no timeout.
     * @var integer|float $timeout
     */
    var $timeout = null;

/**
     * Number of bytes to read at a time in readLine() and
     * readAll(). Defaults to 2048.
     * @var integer $lineLength
     */
    var $lineLength = 2048;

/**
     * The string to use as a newline terminator. Usually "\r\n" or "\n".
     * @var string $newline
     */
    var $newline = "\r\n";

/**
     * Connect to the specified port. If called when the socket is
     * already connected, it disconnects and connects again.
     *
     * @param string  $addr       IP address or host name (may be with protocol prefix).
     * @param integer $port       TCP port number.
     * @param boolean $persistent (optional) Whether the connection is
     *                            persistent (kept open between requests
     *                            by the web server).
     * @param integer $timeout    (optional) Connection socket timeout.
     * @param array   $options    See options for stream_context_create.
     *
     * @access public
     *
     * @return boolean|PEAR_Error  True on success or a PEAR_Error on failure.
     */
    function connect($addr, $port = 0, $persistent = null,
                     $timeout = null, $options = null)
    {
        if (is_resource($this->fp)) {
            @fclose($this->fp);
            $this->fp = null;
        }

if (!$addr) {
            return $this->raiseError('$addr cannot be empty');
        } else if (strspn($addr, ':.0123456789') == strlen($addr)) {
            $this->addr = strpos($addr, ':') !== false ? '['.$addr.']' : $addr;
        } else {
            $this->addr = $addr;
        }

$this->port = $port % 65536;

if ($persistent !== null) {
            $this->persistent = $persistent;
        }

$openfunc = $this->persistent ? 'pfsockopen' : 'fsockopen';
        $errno    = 0;
        $errstr   = '';

$old_track_errors = @ini_set('track_errors', 1);

if ($timeout <= 0) {
 $timeout = @ini_get('default_socket_timeout');
 }

if ($options && function_exists('stream_context_create')) {
            $context = stream_context_create($options);

// Since PHP 5 fsockopen doesn't allow context specification
            if (function_exists('stream_socket_client')) {
                $flags = STREAM_CLIENT_CONNECT;

if ($this->persistent) {
                    $flags = STREAM_CLIENT_PERSISTENT;
                }

$addr = $this->addr . ':' . $this->port;
                $fp   = stream_socket_client($addr, $errno, $errstr,
                                             $timeout, $flags, $context);
            } else {
                $fp = @$openfunc($this->addr, $this->port, $errno,
                                 $errstr, $timeout, $context);
            }
        } else {
            $fp = @$openfunc($this->addr, $this->port, $errno, $errstr, $timeout);
        }

if (!$fp) {
            if ($errno == 0 && !strlen($errstr) && isset($php_errormsg)) {
                $errstr = $php_errormsg;
            }
            @ini_set('track_errors', $old_track_errors);
            return $this->raiseError($errstr, $errno);
        }

@ini_set('track_errors', $old_track_errors);
        $this->fp = $fp;
        $this->setTimeout();
        return $this->setBlocking($this->blocking);
    }

/**
     * Disconnects from the peer, closes the socket.
     *
     * @access public
     * @return mixed true on success or a PEAR_Error instance otherwise
     */
    function disconnect()
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

@fclose($this->fp);
        $this->fp = null;
        return true;
    }

/**
     * Set the newline character/sequence to use.
     *
     * @param string $newline  Newline character(s)
     * @return boolean True
     */
    function setNewline($newline)
    {
        $this->newline = $newline;
        return true;
    }

/**
     * Find out if the socket is in blocking mode.
     *
     * @access public
     * @return boolean  The current blocking mode.
     */
    function isBlocking()
    {
        return $this->blocking;
    }

/**
     * Sets whether the socket connection should be blocking or
     * not. A read call to a non-blocking socket will return immediately
     * if there is no data available, whereas it will block until there
     * is data for blocking sockets.
     *
     * @param boolean $mode True for blocking sockets, false for nonblocking.
     *
     * @access public
     * @return mixed true on success or a PEAR_Error instance otherwise
     */
    function setBlocking($mode)
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

$this->blocking = $mode;
        stream_set_blocking($this->fp, (int)$this->blocking);
        return true;
    }

/**
     * Sets the timeout value on socket descriptor,
     * expressed in the sum of seconds and microseconds
     *
     * @param integer $seconds      Seconds.
     * @param integer $microseconds Microseconds, optional.
     *
     * @access public
     * @return mixed True on success or false on failure or
     *               a PEAR_Error instance when not connected
     */
    function setTimeout($seconds = null, $microseconds = null)
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

if ($seconds === null && $microseconds === null) {
            $seconds      = (int) $this->timeout;
            $microseconds = (int) (($this->timeout - $seconds) * 1000000);
        } else {
            $this->timeout = $seconds + $microseconds/1000000;
        }

if ($this->timeout > 0) {
            return stream_set_timeout($this->fp, (int) $seconds, (int) $microseconds);
        }
        else {
            return false;
        }
    }

/**
     * Sets the file buffering size on the stream.
     * See php's stream_set_write_buffer for more information.
     *
     * @param integer $size Write buffer size.
     *
     * @access public
     * @return mixed on success or an PEAR_Error object otherwise
     */
    function setWriteBuffer($size)
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

$returned = stream_set_write_buffer($this->fp, $size);
        if ($returned == 0) {
            return true;
        }
        return $this->raiseError('Cannot set write buffer.');
    }

/**
 * Returns information about an existing socket resource.
 * Currently returns four entries in the result array:
 *
 * 
 * timed_out (bool) - The socket timed out waiting for data 
 * blocked (bool) - The socket was blocked 
 * eof (bool) - Indicates EOF event 
 * unread_bytes (int) - Number of bytes left in the socket buffer 
 * 
 *
 * @access public
 * @return mixed Array containing information about existing socket
 * resource or a PEAR_Error instance otherwise
 */
 function getStatus()
 {
 if (!is_resource($this->fp)) {
 return $this->raiseError('not connected');
 }

return stream_get_meta_data($this->fp);
    }

/**
     * Get a specified line of data
     *
     * @param int $size Reading ends when size - 1 bytes have been read,
     *                  or a newline or an EOF (whichever comes first).
     *                  If no size is specified, it will keep reading from
     *                  the stream until it reaches the end of the line.
     *
     * @access public
     * @return mixed $size bytes of data from the socket, or a PEAR_Error if
     *         not connected. If an error occurs, FALSE is returned.
     */
    function gets($size = null)
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

if (is_null($size)) {
            return @fgets($this->fp);
        } else {
            return @fgets($this->fp, $size);
        }
    }

/**
     * Read a specified amount of data. This is guaranteed to return,
     * and has the added benefit of getting everything in one fread()
     * chunk; if you know the size of the data you're getting
     * beforehand, this is definitely the way to go.
     *
     * @param integer $size The number of bytes to read from the socket.
     *
     * @access public
     * @return $size bytes of data from the socket, or a PEAR_Error if
     *         not connected.
     */
    function read($size)
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

return @fread($this->fp, $size);
    }

/**
     * Write a specified amount of data.
     *
     * @param string  $data      Data to write.
     * @param integer $blocksize Amount of data to write at once.
     *                           NULL means all at once.
     *
     * @access public
     * @return mixed If the socket is not connected, returns an instance of
     *               PEAR_Error.
     *               If the write succeeds, returns the number of bytes written.
     *               If the write fails, returns false.
     *               If the socket times out, returns an instance of PEAR_Error.
     */
    function write($data, $blocksize = null)
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

if (is_null($blocksize) && !OS_WINDOWS) {
            $written = @fwrite($this->fp, $data);

// Check for timeout or lost connection
            if (!$written) {
                $meta_data = $this->getStatus();

if (!is_array($meta_data)) {
                    return $meta_data; // PEAR_Error
                }

if (!empty($meta_data['timed_out'])) {
                    return $this->raiseError('timed out');
                }
            }

return $written;
        } else {
            if (is_null($blocksize)) {
                $blocksize = 1024;
            }

$pos = 0;
 $size = strlen($data);
 while ($pos < $size) {
 $written = @fwrite($this->fp, substr($data, $pos, $blocksize));

// Check for timeout or lost connection
                if (!$written) {
                    $meta_data = $this->getStatus();

if (!is_array($meta_data)) {
                        return $meta_data; // PEAR_Error
                    }

if (!empty($meta_data['timed_out'])) {
                        return $this->raiseError('timed out');
                    }

return $written;
                }

$pos += $written;
            }

return $pos;
        }
    }

/**
     * Write a line of data to the socket, followed by a trailing newline.
     *
     * @param string $data Data to write
     *
     * @access public
     * @return mixed fwrite() result, or PEAR_Error when not connected
     */
    function writeLine($data)
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

return fwrite($this->fp, $data . $this->newline);
    }

/**
     * Tests for end-of-file on a socket descriptor.
     *
     * Also returns true if the socket is disconnected.
     *
     * @access public
     * @return bool
     */
    function eof()
    {
        return (!is_resource($this->fp) || feof($this->fp));
    }

/**
     * Reads a byte of data
     *
     * @access public
     * @return 1 byte of data from the socket, or a PEAR_Error if
     *         not connected.
     */
    function readByte()
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

return ord(@fread($this->fp, 1));
    }

/**
     * Reads a word of data
     *
     * @access public
     * @return 1 word of data from the socket, or a PEAR_Error if
     *         not connected.
     */
    function readWord()
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

$buf = @fread($this->fp, 2);
 return (ord($buf[0]) + (ord($buf[1]) << 8));
 }

/**
     * Reads an int of data
     *
     * @access public
     * @return integer  1 int of data from the socket, or a PEAR_Error if
     *                  not connected.
     */
    function readInt()
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

$buf = @fread($this->fp, 4);
 return (ord($buf[0]) + (ord($buf[1]) << 8) +
 (ord($buf[2]) << 16) + (ord($buf[3]) << 24));
 }

/**
     * Reads a zero-terminated string of data
     *
     * @access public
     * @return string, or a PEAR_Error if
     *         not connected.
     */
    function readString()
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

$string = '';
        while (($char = @fread($this->fp, 1)) != "\x00") {
            $string .= $char;
        }
        return $string;
    }

/**
     * Reads an IP Address and returns it in a dot formatted string
     *
     * @access public
     * @return Dot formatted string, or a PEAR_Error if
     *         not connected.
     */
    function readIPAddress()
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

$buf = @fread($this->fp, 4);
        return sprintf('%d.%d.%d.%d', ord($buf[0]), ord($buf[1]),
                       ord($buf[2]), ord($buf[3]));
    }

/**
     * Read until either the end of the socket or a newline, whichever
     * comes first. Strips the trailing newline from the returned data.
     *
     * @access public
     * @return All available data up to a newline, without that
     *         newline, or until the end of the socket, or a PEAR_Error if
     *         not connected.
     */
    function readLine()
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

$line = '';

$timeout = time() + $this->timeout;

while (!feof($this->fp) && (!$this->timeout || time() < $timeout)) {
 $line .= @fgets($this->fp, $this->lineLength);
 if (substr($line, -1) == "\n") {
 return rtrim($line, $this->newline);
 }
 }
 return $line;
 }

/**
     * Read until the socket closes, or until there is no more data in
     * the inner PHP buffer. If the inner buffer is empty, in blocking
     * mode we wait for at least 1 byte of data. Therefore, in
     * blocking mode, if there is no data at all to be read, this
     * function will never exit (unless the socket is closed on the
     * remote end).
     *
     * @access public
     *
     * @return string  All data until the socket closes, or a PEAR_Error if
     *                 not connected.
     */
    function readAll()
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

$data = '';
        while (!feof($this->fp)) {
            $data .= @fread($this->fp, $this->lineLength);
        }
        return $data;
    }

/**
     * Runs the equivalent of the select() system call on the socket
     * with a timeout specified by tv_sec and tv_usec.
     *
     * @param integer $state   Which of read/write/error to check for.
     * @param integer $tv_sec  Number of seconds for timeout.
     * @param integer $tv_usec Number of microseconds for timeout.
     *
     * @access public
     * @return False if select fails, integer describing which of read/write/error
     *         are ready, or PEAR_Error if not connected.
     */
    function select($state, $tv_sec, $tv_usec = 0)
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

$read   = null;
        $write  = null;
        $except = null;
        if ($state & NET_SOCKET_READ) {
            $read[] = $this->fp;
        }
        if ($state & NET_SOCKET_WRITE) {
            $write[] = $this->fp;
        }
        if ($state & NET_SOCKET_ERROR) {
            $except[] = $this->fp;
        }
        if (false === ($sr = stream_select($read, $write, $except,
                                          $tv_sec, $tv_usec))) {
            return false;
        }

$result = 0;
        if (count($read)) {
            $result |= NET_SOCKET_READ;
        }
        if (count($write)) {
            $result |= NET_SOCKET_WRITE;
        }
        if (count($except)) {
            $result |= NET_SOCKET_ERROR;
        }
        return $result;
    }

/**
     * Turns encryption on/off on a connected socket.
     *
     * @param bool    $enabled Set this parameter to true to enable encryption
     *                         and false to disable encryption.
     * @param integer $type    Type of encryption. See stream_socket_enable_crypto()
     *                         for values.
     *
     * @see    http://se.php.net/manual/en/function.stream-socket-enable-crypto.php
     * @access public
     * @return false on error, true on success and 0 if there isn't enough data
     *         and the user should try again (non-blocking sockets only).
     *         A PEAR_Error object is returned if the socket is not
     *         connected
     */
    function enableCrypto($enabled, $type)
    {
        if (version_compare(phpversion(), "5.1.0", ">=")) {
            if (!is_resource($this->fp)) {
                return $this->raiseError('not connected');
            }
            return @stream_socket_enable_crypto($this->fp, $enabled, $type);
        } else {
            $msg = 'Net_Socket::enableCrypto() requires php version >= 5.1.0';
            return $this->raiseError($msg);
        }
    }

}

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