1 files changed, 43 insertions, 0 deletions
diff --git a/wrappers/php/src/Impl/GoSlice.php b/wrappers/php/src/Impl/GoSlice.php
new file mode 100644
index 0000000..441b460
--- /dev/null
+++ b/wrappers/php/src/Impl/GoSlice.php
@@ -0,0 +1,43 @@
+<?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) throw new RuntimeException('error allocating buffer');
+		$this->cData = $cData;
+		FFI::memcpy($cData, $data, $len);
+
+		$slice = $ffi->new('GoSlice');
+		if (!$slice) 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;
+	}
+}