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<?php
namespace Http\Message\Encoding;
use Clue\StreamFilter as Filter;
use Http\Message\Decorator\StreamDecorator;
use Psr\Http\Message\StreamInterface;
/**
* A filtered stream has a filter for filtering output and a filter for filtering input made to a underlying stream.
*
* @author Joel Wurtz <joel.wurtz@gmail.com>
*/
abstract class FilteredStream implements StreamInterface
{
const BUFFER_SIZE = 8192;
use StreamDecorator;
/**
* @var callable
*/
protected $readFilterCallback;
/**
* @var resource
*
* @deprecated since version 1.5, will be removed in 2.0
*/
protected $readFilter;
/**
* @var callable
*
* @deprecated since version 1.5, will be removed in 2.0
*/
protected $writeFilterCallback;
/**
* @var resource
*
* @deprecated since version 1.5, will be removed in 2.0
*/
protected $writeFilter;
/**
* Internal buffer.
*
* @var string
*/
protected $buffer = '';
/**
* @param StreamInterface $stream
* @param mixed|null $readFilterOptions
* @param mixed|null $writeFilterOptions deprecated since 1.5, will be removed in 2.0
*/
public function __construct(StreamInterface $stream, $readFilterOptions = null, $writeFilterOptions = null)
{
$this->readFilterCallback = Filter\fun($this->readFilter(), $readFilterOptions);
$this->writeFilterCallback = Filter\fun($this->writeFilter(), $writeFilterOptions);
if (null !== $writeFilterOptions) {
@trigger_error('The $writeFilterOptions argument is deprecated since version 1.5 and will be removed in 2.0.', E_USER_DEPRECATED);
}
$this->stream = $stream;
}
/**
* {@inheritdoc}
*/
public function read($length)
{
if (strlen($this->buffer) >= $length) {
$read = substr($this->buffer, 0, $length);
$this->buffer = substr($this->buffer, $length);
return $read;
}
if ($this->stream->eof()) {
$buffer = $this->buffer;
$this->buffer = '';
return $buffer;
}
$read = $this->buffer;
$this->buffer = '';
$this->fill();
return $read.$this->read($length - strlen($read));
}
/**
* {@inheritdoc}
*/
public function eof()
{
return $this->stream->eof() && $this->buffer === '';
}
/**
* Buffer is filled by reading underlying stream.
*
* Callback is reading once more even if the stream is ended.
* This allow to get last data in the PHP buffer otherwise this
* bug is present : https://bugs.php.net/bug.php?id=48725
*/
protected function fill()
{
$readFilterCallback = $this->readFilterCallback;
$this->buffer .= $readFilterCallback($this->stream->read(self::BUFFER_SIZE));
if ($this->stream->eof()) {
$this->buffer .= $readFilterCallback();
}
}
/**
* {@inheritdoc}
*/
public function getContents()
{
$buffer = '';
while (!$this->eof()) {
$buf = $this->read(self::BUFFER_SIZE);
// Using a loose equality here to match on '' and false.
if ($buf == null) {
break;
}
$buffer .= $buf;
}
return $buffer;
}
/**
* {@inheritdoc}
*/
public function getSize()
{
return;
}
/**
* {@inheritdoc}
*/
public function __toString()
{
return $this->getContents();
}
/**
* Returns the read filter name.
*
* @return string
*
* @deprecated since version 1.5, will be removed in 2.0
*/
public function getReadFilter()
{
@trigger_error('The '.__CLASS__.'::'.__METHOD__.' method is deprecated since version 1.5 and will be removed in 2.0.', E_USER_DEPRECATED);
return $this->readFilter();
}
/**
* Returns the write filter name.
*
* @return string
*/
abstract protected function readFilter();
/**
* Returns the write filter name.
*
* @return string
*
* @deprecated since version 1.5, will be removed in 2.0
*/
public function getWriteFilter()
{
@trigger_error('The '.__CLASS__.'::'.__METHOD__.' method is deprecated since version 1.5 and will be removed in 2.0.', E_USER_DEPRECATED);
return $this->writeFilter();
}
/**
* Returns the write filter name.
*
* @return string
*/
abstract protected function writeFilter();
}
|
