From 7cdf3464a1db3184c9f635a8fe46a2c829338072 Mon Sep 17 00:00:00 2001
From: Vendicated <vendicated@riseup.net>
Date: Fri, 2 Aug 2024 13:56:23 +0200
Subject: [PATCH] use raw bitwise instead of buffers

---
 src/plugins/ircColors/index.ts | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/src/plugins/ircColors/index.ts b/src/plugins/ircColors/index.ts
index 831423fdc..d5cc5f3e4 100644
--- a/src/plugins/ircColors/index.ts
+++ b/src/plugins/ircColors/index.ts
@@ -21,14 +21,14 @@ import { Devs } from "@utils/constants";
 import definePlugin, { OptionType } from "@utils/types";
 
 // Compute a 64-bit FNV-1a hash of the passed data
-function hash(data: ArrayBuffer) {
+function hash(id: bigint) {
     const fnvPrime = 1099511628211n;
     const offsetBasis = 14695981039346656037n;
 
     let result = offsetBasis;
-    for (const byte of new Uint8Array(data)) {
-        result ^= BigInt(byte);
-        result = (result * fnvPrime) % 2n**32n;
+    for (let i = 7n; i >= 0n; i--) {
+        result ^= (id >> (8n * i)) & 0xffn;
+        result = (result * fnvPrime) % 2n ** 32n;
     }
 
     return result;
@@ -36,12 +36,7 @@ function hash(data: ArrayBuffer) {
 
 // Calculate a CSS color string based on the user ID
 function calculateNameColorForUser(id: bigint) {
-    const idBuffer = new ArrayBuffer(8);
-    {
-        const idView = new DataView(idBuffer);
-        idView.setBigUint64(0, id);
-    }
-    const idHash = hash(idBuffer);
+    const idHash = hash(id);
 
     return `hsl(${idHash % 360n}, 100%, ${settings.store.lightness}%)`;
 }