Remove duplicated code in the TestableSocket.

SourceQuery/Socket/Traits/GoldSourcePacketDataTrait.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @author Pavel Djundik
+ *
+ * @see https://xpaw.me
+ * @see https://github.com/xPaw/PHP-Source-Query
+ *
+ * @license GNU Lesser General Public License, version 2.1
+ *
+ * @internal
+ */
+
+namespace xPaw\SourceQuery\Socket\Traits;
+
+use xPaw\SourceQuery\Buffer;
+
+trait GoldSourcePacketDataTrait
+{
+    protected function readInternalPacketData(
+        Buffer $buffer,
+        int &$count,
+        int &$number,
+        bool &$isCompressed,
+        ?int &$checksum
+    ): void {
+        $packetCountAndNumber = $buffer->getByte();
+        $count = $packetCountAndNumber & 0xF;
+        $number = $packetCountAndNumber >> 4;
+        $isCompressed = false;
+    }
+}