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<?php declare(strict_types=1);
/** @internal */
namespace EduVpn\Common\Impl;
use FFI;
use FFI\CData;
use RuntimeException;
/** @internal */
class GoSlice
{
// Will be destroyed along with this GoSlice
private CData $cData, $slice;
public function __construct(FFI $ffi, string $data)
{
$len = strlen($data);
$cData = FFI::new(FFI::arrayType(FFI::type('char'), [$len]), false);
if ($cData === null) throw new RuntimeException('error allocating buffer');
$this->cData = $cData;
FFI::memcpy($cData, $data, $len);
$slice = $ffi->new('GoSlice');
if ($slice === null) throw new RuntimeException('error allocating buffer');
$this->slice = $slice;
$slice->data = FFI::addr($cData); // $cData must not be destroyed while $slice is in use
$slice->cap = $slice->len = $len;
}
public function slice(): CData
{
return $this->slice;
}
public function __destruct()
{
// Make sure we do not unknowingly use a slice with deallocated data
$this->slice->data = null;
$this->slice->cap = $this->slice->len = 0;
}
}
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