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Mini Shell
<?php
namespace Amp\ByteStream;
use Amp\Promise;
/**
* Allows compression of output streams using Zlib.
*/
final class ZlibOutputStream implements OutputStream
{
/** @var OutputStream|null */
private $destination;
/** @var int */
private $encoding;
/** @var array */
private $options;
/** @var resource|null */
private $resource;
/**
* @param OutputStream $destination Output stream to write the compressed data to.
* @param int $encoding Compression encoding to use, see `deflate_init()`.
* @param array $options Compression options to use, see `deflate_init()`.
*
* @throws StreamException If an invalid encoding or invalid options have been passed.
*
* @see http://php.net/manual/en/function.deflate-init.php
*/
public function __construct(OutputStream $destination, int $encoding, array $options = [])
{
$this->destination = $destination;
$this->encoding = $encoding;
$this->options = $options;
$this->resource = @\deflate_init($encoding, $options);
if ($this->resource === false) {
throw new StreamException("Failed initializing deflate context");
}
}
/** @inheritdoc */
public function write(string $data): Promise
{
if ($this->resource === null) {
throw new ClosedException("The stream has already been closed");
}
\assert($this->destination !== null);
$compressed = \deflate_add($this->resource, $data, \ZLIB_SYNC_FLUSH);
if ($compressed === false) {
throw new StreamException("Failed adding data to deflate context");
}
$promise = $this->destination->write($compressed);
$promise->onResolve(function ($error) {
if ($error) {
$this->close();
}
});
return $promise;
}
/** @inheritdoc */
public function end(string $finalData = ""): Promise
{
if ($this->resource === null) {
throw new ClosedException("The stream has already been closed");
}
\assert($this->destination !== null);
$compressed = \deflate_add($this->resource, $finalData, \ZLIB_FINISH);
if ($compressed === false) {
throw new StreamException("Failed adding data to deflate context");
}
$promise = $this->destination->end($compressed);
$promise->onResolve(function () {
$this->close();
});
return $promise;
}
/**
* @internal
* @return void
*/
private function close()
{
$this->resource = null;
$this->destination = null;
}
/**
* Gets the used compression encoding.
*
* @return int Encoding specified on construction time.
*/
public function getEncoding(): int
{
return $this->encoding;
}
/**
* Gets the used compression options.
*
* @return array Options array passed on construction time.
*/
public function getOptions(): array
{
return $this->options;
}
}
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