Move to more PSR-4 standards.

lib/OpenPgP/SignaturePacket/Subpacket.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Leenooks\OpenPGP\SignaturePacket;
+
+use Leenooks\OpenPGP\Packet;
+
+class Subpacket extends Packet
+{
+	protected $tag = NULL;
+
+	function body()
+	{
+		return $this->data;
+	}
+
+	function header_and_body(): array
+	{
+		$body = $this->body();											// Get body first, we will need it's length
+		$size = chr(255).pack('N',strlen($body)+1);	// Use 5-octet lengths + 1 for tag as first packet body octet
+		$tag = chr($this->tag);
+
+		return ['header'=>$size.$tag,'body'=>$body];
+	}
+	
+	/* Defaults for unsupported packets */
+	function read()
+	{
+		$this->data = $this->input;
+	}
+}