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Stream.php
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Stream.php
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<?php
/**
* ~~summary~~
*
* ~~description~~
*
* PHP version 5
*
* @category Net
* @package PEAR2_Net_Transmitter
* @author Vasil Rangelov <boen.robot@gmail.com>
* @copyright 2011 Vasil Rangelov
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
* @version SVN: $WCREV$
* @link http://pear2.php.net/PEAR2_Net_Transmitter
*/
/**
* The namespace declaration.
*/
namespace PEAR2\Net\Transmitter;
/**
* A stream transmitter.
*
* This is a convinience wrapper for stream functionality. Used to ensure data
* integrity. Designed for TCP sockets, but it has intentionally been made to
* accept any stream.
*
* @category Net
* @package PEAR2_Net_Transmitter
* @author Vasil Rangelov <boen.robot@gmail.com>
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
* @link http://pear2.php.net/PEAR2_Net_Transmitter
*/
class Stream
{
/**
* Used to apply settings to both sending and receiving.
*/
const DIRECTION_ALL = '|||';
/**
* Used to apply settings only to sending.
*/
const DIRECTION_SEND = '<<<';
/**
* Used to apply settings only to receiving.
*/
const DIRECTION_RECEIVE = '>>>';
/**
* @var resource The stream to wrap around.
*/
protected $stream;
/**
* @var bool A flag that tells whether or not the stream is persistent.
*/
protected $persist;
/**
* @var array An associative array with the chunk size of each direction.
* Key is the direction, value is the size in bytes as integer.
*/
protected $chunkSize = array(
self::DIRECTION_SEND => 0xFFFFF, self::DIRECTION_RECEIVE => 0xFFFFF
);
/**
* Wraps around the specified stream.
*
* @param resource $stream The stream to wrap around.
*
* @see isFresh()
*/
public function __construct($stream)
{
if (!self::isStream($stream)) {
throw $this->createException('Invalid stream supplied.', 1);
}
$this->stream = $stream;
$this->persist = (bool) preg_match(
'#\s?persistent\s?#sm', get_resource_type($stream)
);
}
/**
* Checks if a given variable is a stream resource.
*
* @param mixed $var The variable to check.
*
* @return bool TRUE on success, FALSE on failure.
*/
public static function isStream($var)
{
return is_resource($var)
&& (bool) preg_match('#\s?stream$#sm', get_resource_type($var));
}
/**
* Checks whether the wrapped stream is fresh.
*
* Checks whether the wrapped stream is fresh. A stream is considered fresh
* if there hasn't been any activity on it. Particularly useful for
* detecting reused persistent connections.
*
* @return bool TRUE if the socket is fresh, FALSE otherwise.
*/
public function isFresh()
{
return ftell($this->stream) === 0;
}
/**
* Sets the timeout for the stream.
*
* @param int $seconds Timeout in seconds.
* @param int $microseconds Timeout in microseconds to be added to the
* seconds.
*
* @return bool TRUE on success, FALSE on failure.
*/
public function setTimeout($seconds, $microseconds = 0)
{
return stream_set_timeout($this->stream, $seconds, $microseconds);
}
/**
* Sets the size of a stream's buffer.
*
* @param int $size The desired size of the buffer, in bytes.
* @param string $direction The buffer of which direction to set. Valid
* values are the DIRECTION_* constants.
*
* @return bool TRUE on success, FALSE on failure.
*/
public function setBuffer($size, $direction = self::DIRECTION_ALL)
{
switch($direction) {
case self::DIRECTION_SEND:
return stream_set_write_buffer($this->stream, $size) === 0;
case self::DIRECTION_RECEIVE:
return stream_set_read_buffer($this->stream, $size) === 0;
case self::DIRECTION_ALL:
return stream_set_write_buffer($this->stream, $size) === 0
&& stream_set_read_buffer($this->stream, $size) === 0;
}
return false;
}
/**
* Sets the size of the chunk.
*
* To ensure data integrity, as well as to allow for lower memory
* consumption, data is sent/received in chunks. This function
* allows you to set the size of each chunk. The default is 0xFFFFF.
*
* @param int $size The desired size of the chunk, in bytes.
* @param string $direction The chunk of which direction to set. Valid
* values are the DIRECTION_* constants.
*
* @return bool TRUE on success, FALSE on failure.
*/
public function setChunk($size, $direction = self::DIRECTION_ALL)
{
$size = (int) $size;
if ($size <= 0) {
return false;
}
switch($direction) {
case self::DIRECTION_SEND:
case self::DIRECTION_RECEIVE:
$this->chunkSize[$direction] = $size;
return true;
case self::DIRECTION_ALL:
$this->chunkSize[self::DIRECTION_SEND]
= $this->chunkSize[self::DIRECTION_RECEIVE] = $size;
return true;
}
return false;
}
/**
* Sends a string over the wrapped stream.
*
* @param string $string The string to send.
*
* @return int The number of bytes sent.
*/
public function send($string)
{
$bytes = 0;
$bytesToSend = (double) sprintf('%u', strlen($string));
$chunkSize = $this->chunkSize[self::DIRECTION_SEND];
while ($bytes < $bytesToSend) {
if ($this->isAcceptingData()) {
$bytesNow = @fwrite(
$this->stream, substr($string, $bytes, $chunkSize)
);
if (0 != $bytesNow) {
$bytes += $bytesNow;
} else {
throw $this->createException(
'Failed while sending string.', 2
);
}
}
}
return $bytes;
}
/**
* Sends a stream over the wrapped stream.
*
* @param resource $stream The stream to send.
*
* @return int The number of bytes sent.
*/
public function sendStream($stream)
{
$bytes = 0;
$chunkSize = $this->chunkSize[self::DIRECTION_SEND];
while (!feof($stream)) {
if ($this->isAcceptingData()) {
$bytesNow = @stream_copy_to_stream(
$stream, $this->stream, $chunkSize
);
if (0 != $bytesNow) {
$bytes += $bytesNow;
} else {
throw $this->createException(
'Failed while sending stream.', 3
);
}
}
}
fseek($stream, -$bytes, SEEK_CUR);
return $bytes;
}
/**
* Reads from the wrapped stream to receive.
*
* Reads from the wrapped stream to receive content as a string.
*
* @param int $length The number of bytes to read.
* @param string $what Descriptive string about what is being received
* (used in exception messages).
*
* @return string The received content.
*/
public function receive($length, $what = 'data')
{
$result = '';
$chunkSize = $this->chunkSize[self::DIRECTION_RECEIVE];
while ($length > 0) {
if ($this->isAvailable()) {
while ($this->isDataAwaiting()) {
$fragment = fread($this->stream, min($length, $chunkSize));
if ('' !== $fragment) {
$length -= strlen($fragment);
$result .= $fragment;
continue 2;
}
}
}
throw $this->createException(
"Failed while receiving {$what}", 4
);
}
return $result;
}
/**
* Reads from the wrapped stream to receive.
*
* Reads from the wrapped stream to receive content as a stream.
*
* @param int $length The number of bytes to read.
* @param FilterCollection $filters A collection of filters to apply to the
* stream while receiving.
* @param string $what Descriptive string about what is being
* received (used in exception messages).
*
* @return resource The received content.
*/
public function receiveStream(
$length, FilterCollection $filters = null, $what = 'stream data'
) {
$result = fopen('php://temp', 'r+b');
$appliedFilters = array();
if (null !== $filters) {
foreach ($filters as $filtername => $params) {
$appliedFilters[] = stream_filter_append(
$result, $filtername, STREAM_FILTER_WRITE, $params
);
}
}
$chunkSize = $this->chunkSize[self::DIRECTION_RECEIVE];
while ($length > 0) {
if ($this->isAvailable()) {
while ($this->isDataAwaiting()) {
$fragment = fread($this->stream, min($length, $chunkSize));
if ('' !== $fragment) {
$length -= strlen($fragment);
fwrite($result, $fragment);
continue 2;
}
}
}
throw $this->createException(
"Failed while receiving {$what}", 5
);
}
foreach ($appliedFilters as $filter) {
stream_filter_remove($filter);
}
rewind($result);
return $result;
}
/**
* Checks whether the stream is available for operations.
*
* @return bool TRUE if the stream is available, FALSE otherwise.
*/
public function isAvailable()
{
return self::isStream($this->stream) && !feof($this->stream);
}
/**
* Checks whether there is data to be read from the wrapped stream.
*
* @return bool TRUE if there is data to be read, FALSE otherwise.
*/
public function isDataAwaiting()
{
return $this->isAvailable();
}
/**
* Checks whether the wrapped stream can be written to without a block.
*
* @return bool TRUE if the wrapped stream would not block on a write, FALSE
* otherwise.
*/
public function isAcceptingData()
{
$r = $e = null;
$w = array($this->stream);
return self::isStream($this->stream)
&& 1 === @/* due to PHP bug #54563 */stream_select($r, $w, $e, 0);
}
/**
* Closes the opened stream, unless it's a persistent one.
*/
public function __destruct()
{
if (!$this->persist) {
$this->close();
}
}
/**
* Closes the opened stream, even if it is a persistent one.
*
* @return bool TRUE on success, FALSE on failure.
*/
public function close()
{
return self::isStream($this->stream) && fclose($this->stream);
}
/**
* Creates a new exception.
*
* Creates a new exception. Used by the rest of the functions in this class.
* Override in derived classes for custom exception handling.
*
* @param string $message The exception message.
* @param int $code The exception code.
*
* @return \Exception The exception to then be thrown.
*/
protected function createException($message, $code = 0)
{
return new StreamException($message, $code);
}
}