refactor a bit more

func_replacements.js

@@ -1,33 +1,5 @@
 import { swap_endianness_u32, swap_endianness_u16, u16_swap } from "./utils.js";
-export const Commands = {
-  Close: 0xf1f0,
-  LanSearchExt: 0xf132,
-  LanSearch: 0xf130,
-  P2PAlive: 0xf1e0,
-  P2PAliveAck: 0xf1e1,
-  Hello: 0xf100,
-  P2pRdy: 0xf142,
-  P2pReq: 0xf120,
-  LstReq: 0xf167,
-  DrwAck: 0xf1d1,
-  Drw: 0xf1d0,
-
-  // From CSession_CtrlPkt_Proc, incomplete
-  PunchTo: 0xf140,
-  PunchPkt: 0xf141,
-  HelloAck: 0xf101,
-  RlyTo: 0xf102,
-  DevLgnAck: 0xf111,
-  P2PReqAck: 0xf121,
-  ListenReqAck: 0xf169,
-  RlyHelloAck: 0xf170, // always
-  RlyHelloAck2: 0xf171, // if len >1??
-};
-
-export const CommandsByValue = Object.keys(Commands).reduce((acc, cur) => {
-  acc[Commands[cur]] = cur;
-  return acc;
-}, {});
+import { Commands, CommandsByValue } from "./datatypes.js";
 
 const writeCommand2 = (command, buf) => {
   buf.writeByteArray([(command & 0xff00) >> 8, command & 0xff]);
@@ -37,6 +9,7 @@ const writeCommand4 = (command, buf) => {
 };
 
 export const XqBytesDec = (inoutbuf, buflen, rotate) => {
+  // only rotation is different
   let new_buf = new Uint8Array(buflen);
   new_buf.fill(0x1);
   for (let i = 0; i < buflen; i++) {