<?php
namespace Druidfi\Mysqldump\Compress;
use Exception;
class CompressGzip implements CompressInterface
{
private $fileHandler;
private int $level;
public function __construct(int $level = 0)
{
if (!function_exists('gzopen')) {
throw new Exception('Compression is enabled, but gzip lib is not installed or configured properly');
}
$this->level = ($level >= 1 && $level <= 9) ? $level : 0;
}
public function open(string $filename): bool
{
$mode = $this->level > 0 ? 'wb' . $this->level : 'wb';
$this->fileHandler = gzopen($filename, $mode);
if (false === $this->fileHandler) {
throw new Exception('Output file is not writable');
}
return true;
}
public function write(string $str): int
{
$bytesWritten = gzwrite($this->fileHandler, $str);
if (false === $bytesWritten) {
throw new Exception('Writing to file failed! Probably, there is no more free space left?');
}
return $bytesWritten;
}
public function close(): bool
{
return gzclose($this->fileHandler);
}
}