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<?php
namespace Amp\ByteStream;
use Amp\Promise;
use function Amp\call;
/**
* Allows decompression of input streams using Zlib.
*/
final class ZlibInputStream implements InputStream
{
/** @var InputStream|null */
private $source;
/** @var int */
private $encoding;
/** @var array */
private $options;
/** @var resource|null */
private $resource;
/**
* @param InputStream $source Input stream to read compressed data from.
* @param int $encoding Compression algorithm used, see `inflate_init()`.
* @param array $options Algorithm options, see `inflate_init()`.
*
* @throws StreamException
* @throws \Error
*
* @see http://php.net/manual/en/function.inflate-init.php
*/
public function __construct(InputStream $source, int $encoding, array $options = [])
{
$this->source = $source;
$this->encoding = $encoding;
$this->options = $options;
$this->resource = @\inflate_init($encoding, $options);
if ($this->resource === false) {
throw new StreamException("Failed initializing deflate context");
}
}
/** @inheritdoc */
public function read(): Promise
{
return call(function () {
if ($this->resource === null) {
return null;
}
\assert($this->source !== null);
$data = yield $this->source->read();
// Needs a double guard, as stream might have been closed while reading
/** @psalm-suppress ParadoxicalCondition */
if ($this->resource === null) {
return null;
}
if ($data === null) {
$decompressed = @\inflate_add($this->resource, "", \ZLIB_FINISH);
if ($decompressed === false) {
throw new StreamException("Failed adding data to deflate context");
}
$this->close();
return $decompressed;
}
$decompressed = @\inflate_add($this->resource, $data, \ZLIB_SYNC_FLUSH);
if ($decompressed === false) {
throw new StreamException("Failed adding data to deflate context");
}
return $decompressed;
});
}
/**
* @internal
* @return void
*/
private function close()
{
$this->resource = null;
$this->source = 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;
}
}