From 2311ac23ae1b9f0fdc90cd1c293f15574a4908be Mon Sep 17 00:00:00 2001
From: Luca <Luca@hackerspace-bamberg.de>
Date: Thu, 5 Sep 2024 21:31:52 +0200
Subject: [PATCH] feat: varint encoding

---
 mqtt.lua | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/mqtt.lua b/mqtt.lua
index 1f5277c..e7c7a61 100644
--- a/mqtt.lua
+++ b/mqtt.lua
@@ -42,6 +42,20 @@ local readVarint = function (conn, first_byte)
     return n + (b << s), nil
 end
 
+local encodeVarint = function (n)
+    if n > 268435455 then
+        return nil, "number too large"
+    end
+
+    local data = ""
+    while n > 127 do
+        data = data .. string.char(0x80 | n & 0x7F)
+        n = n >> 7
+    end
+
+    return data .. string.char(n), nil
+end
+
 local MqttClient = {}
 
 function mqtt.open (address, port)