packets.php

<?php /** @noinspection PhpUnhandledExceptionInspection */
if(empty($argv[1]) || empty($argv[2]))
{
	die("Syntax: packets <recipient: client or server> <file>\n");
}
require __DIR__."/_autoload.php";
use Phpcraft\
{Connection, Packet\ClientboundPacketId, Packet\PacketId, Packet\ServerboundPacketId, Versions};
echo "Phpcraft Packet Dump Reader\n\n";
if(!in_array($argv[1], [
	"client",
	"server"
]))
{
	die("Invalid recipient '".$argv[1]."', expected 'client' or 'server'.\n");
}
$fh = fopen($argv[2], "r");
$con = new Connection(-1, $fh);
if(!($pv = $con->readPacket()) || strlen($con->read_buffer) > 0)
{
	die("Failed to read protocol version.\nWrite 0x05 0xff 0xff 0xff 0xff 0x0f to the beginning of the file so protocol version -1 is detected.\n");
}
if($range = Versions::protocolToRange($pv))
{
	echo "Detected Minecraft $range (protocol version $pv).\n";
}
else
{
	echo "Detected unsupported protocol version {$pv}.\n";
}
function processBatch()
{
	global $id_count, $last_id, $last_name, $total_size;
	if($id_count == 1)
	{
		echo "1x ".convertPacket($last_id, $last_name)." with {$total_size} B of data\n";
	}
	else
	{
		echo $id_count."x ".convertPacket($last_id, $last_name)." with {$total_size} B (avg. ".round($total_size / $id_count)." B) of data\n";
	}
}

function convertPacket(int $id, string $name)
{
	if($name)
	{
		return $name." (0x".dechex($id)." | {$id})";
	}
	else
	{
		return "0x".dechex($id)." ({$id})";
	}
}

$con->protocol_version = $pv;
$last_id = null;
$last_name = "";
$id_count = 0;
$total_size = 0;
while(($id = $con->readPacket()) !== false)
{
	$size = strlen($con->read_buffer);
	if($argv[1] == "client")
	{
		$packetId = ClientboundPacketId::getById($id, $pv);
	}
	else
	{
		$packetId = ServerboundPacketId::getById($id, $pv);
	}
	if($packetId)
	{
		$name = $packetId->name;
	}
	else
	{
		$name = "";
	}
	if($size == 0)
	{
		die(convertPacket($id, $name)." has no data.\n");
	}
	if($packetId instanceof PacketId && ($packet = $packetId->getInstance($con)))
	{
		if($last_id)
		{
			processBatch();
			$last_id = false;
			$id_count = 0;
			$total_size = 0;
		}
		echo $packet->__toString()."\n";
	}
	else if($last_id === $id)
	{
		$id_count++;
		$total_size += $size;
	}
	else
	{
		if($last_id)
		{
			processBatch();
		}
		$last_id = $id;
		$last_name = $name;
		$id_count = 1;
		$total_size = $size;
	}
}
if($last_id)
{
	processBatch();
}
if(strlen(stream_get_contents($fh)) > 0)
{
	echo "Error: There was still some data left in the stream despite having finished reading.\n";
}
else
{
	echo "This seems to have been a valid packet dump file.\n";
}
fclose($fh);