Viewing file:  DeflateWriter.php (1.35 KB) -rw-r--r--
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<?php
namespace samdark\sitemap;
/**
* Flushes buffer into file with incremental deflating data, available in PHP 7.0+
*/
class DeflateWriter implements WriterInterface
{
/**
* @var resource for target file
*/
private $file;
/**
* @var resource for writable incremental deflate context
*/
private $deflateContext;
/**
* @param string $filename target file
*/
public function __construct($filename)
{
$this->file = fopen($filename, 'ab');
$this->deflateContext = deflate_init(ZLIB_ENCODING_GZIP);
}
/**
* Deflate data in a deflate context and write it to the target file
*
* @param string $data
* @param int $flushMode zlib flush mode to use for writing
*/
private function write($data, $flushMode)
{
assert($this->file !== null);
$compressedChunk = deflate_add($this->deflateContext, $data, $flushMode);
fwrite($this->file, $compressedChunk);
}
/**
* Store data in a deflate stream
*
* @param string $data
*/
public function append($data)
{
$this->write($data, ZLIB_NO_FLUSH);
}
/**
* Make sure all data was written
*/
public function finish()
{
$this->write('', ZLIB_FINISH);
$this->file = null;
$this->deflateContext = null;
}
}
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