Got client stuck in connecting till timeout

lib/game_server.rb

@@ -13,7 +13,7 @@ class GameServer
     @pred_game_tick = 0
     @map = Map.new(
       name: 'dm1',
-      crc: 1_683_261_464,
+      crc: '98a0a4c50c', # decimal 64548818
       size: 6793,
       sha256: '491af17a510214506270904f147a4c30ae0a85b91bb854395bef8c397fc078c3'
     )

lib/map.rb

@@ -3,14 +3,23 @@
 require_relative 'bytes'
 
 class Map
-  attr_reader :name, :crc, :size, :sha256, :sha256_str, :sha256_arr
+  attr_reader :name, :crc, :crc_str, :crc_arr, :size, :sha256, :sha256_str, :sha256_arr
 
   def initialize(attr = {})
     # map name as String
     @name = attr[:name]
 
-    # crc has to be a positive Integer
+    # crc hex encoded string (8 characters / 4 bytes)
     @crc = attr[:crc]
+    raise "Error: map crc invalid type: #{@crc.class}" unless @crc.instance_of?(String)
+
+    unless @crc.match(/[a-fA-F0-9]{8}/) # str encoded hex
+      raise "Error: map crc raw string expects size 8 but got #{@crc.size}"
+    end
+
+    @crc_str = @crc
+    @crc_arr = str_bytes(@crc)
+    @crc = @crc_arr.pack('C*')
 
     # size has to be a positive Integer
     @size = attr[:size]
@@ -33,7 +42,7 @@ class Map
         @sha256 = @sha256_arr.pack('C*')
         @sha256_str = str_hex(@sha256).gsub(' ', '')
       else
-        raise "Error: map raw string expects size 32 but got #{@sha256.size}"
+        raise "Error: map sha256 raw string expects size 64 but got #{@sha256.size}"
       end
     elsif @sha256.instance_of?(Array) # int byte array
       raise "Error: map sha256 array expects size 32 but got #{@sha256.size}" if @sha256.size != 32
@@ -41,6 +50,8 @@ class Map
       @sha256_arr = @sha256
       @sha256 = @sha256.pack('C*')
       @sha256_str = @sha256.map { |b| b.to_s(16).rjust(2, '0') }.join
+    else
+      raise "Error: map sha256 invalid type: #{@sha256.class}"
     end
   end
 end

lib/teeworlds_server.rb

@@ -116,7 +116,7 @@ class TeeworldsServer
   def send_map(addr)
     data = []
     data += Packer.pack_str(@game_server.map.name)
-    data += Packer.pack_int(@game_server.map.crc)
+    data += @game_server.map.crc_arr # poor mans pack_raw()
     data += Packer.pack_int(@game_server.map.size)
     data += Packer.pack_int(8) # chunk num?
     data += Packer.pack_int(MAP_CHUNK_SIZE)