From 7d7b92678b0741bab0917ab6f51d596d13a78452 Mon Sep 17 00:00:00 2001
From: Joel Wetzell <jwetzell@yahoo.com>
Date: Wed, 22 Jan 2025 23:10:42 -0600
Subject: [PATCH] reuse fixed size DataViews

---
 src/encoders/chunk.ts                             | 2 +-
 src/encoders/data/data-tracker-timestamp-chunk.ts | 2 +-
 src/encoders/packet-header-chunk.ts               | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/encoders/chunk.ts b/src/encoders/chunk.ts
index bddec09..252cd60 100644
--- a/src/encoders/chunk.ts
+++ b/src/encoders/chunk.ts
@@ -1,3 +1,4 @@
+const header = new DataView(new ArrayBuffer(4));
 export default (id: number, chunkData: Uint8Array, hasSubchunks: boolean): Uint8Array => {
   if (!Number.isInteger(id)) {
     throw new Error('chunk id must be an integer');
@@ -11,7 +12,6 @@ export default (id: number, chunkData: Uint8Array, hasSubchunks: boolean): Uint8
     throw new Error('chunkData can not be greater than 32767 bytes');
   }
 
-  const header = new DataView(new ArrayBuffer(4));
   header.setUint16(0, id, true);
   const hasSubChunksBit = (hasSubchunks ? 1 : 0) << 15;
   header.setUint16(2, hasSubChunksBit + chunkData.length, true);
diff --git a/src/encoders/data/data-tracker-timestamp-chunk.ts b/src/encoders/data/data-tracker-timestamp-chunk.ts
index dcc674b..01e0456 100644
--- a/src/encoders/data/data-tracker-timestamp-chunk.ts
+++ b/src/encoders/data/data-tracker-timestamp-chunk.ts
@@ -1,7 +1,7 @@
 import chunk from '../chunk';
 
+const buf = new DataView(new ArrayBuffer(8));
 export default (timestamp: bigint): Uint8Array => {
-  const buf = new DataView(new ArrayBuffer(8));
   buf.setBigUint64(0, BigInt(timestamp), true);
   return chunk(0x0006, new Uint8Array(buf.buffer), false);
 };
diff --git a/src/encoders/packet-header-chunk.ts b/src/encoders/packet-header-chunk.ts
index d844877..84b3210 100644
--- a/src/encoders/packet-header-chunk.ts
+++ b/src/encoders/packet-header-chunk.ts
@@ -1,5 +1,6 @@
 import chunk from './chunk';
 
+const packetHeader = new DataView(new ArrayBuffer(12));
 export default (
   timestamp: bigint,
   versionHigh: number,
@@ -33,7 +34,6 @@ export default (
     throw new Error('frame packet count must be >= 0 and <= 255');
   }
 
-  const packetHeader = new DataView(new ArrayBuffer(12));
   packetHeader.setBigUint64(0, BigInt(timestamp), true);
   packetHeader.setUint8(8, versionHigh);
   packetHeader.setUint8(9, versionLow);