From 461bd820b4c89d261ade6576874dd5bd1edb4341 Mon Sep 17 00:00:00 2001
From: glooca <47379602+glooca@users.noreply.github.com>
Date: Fri, 14 Jan 2022 19:01:55 +0200
Subject: [PATCH] Crc leading zero fix for streams

---
 mod.ts  | 4 ++--
 test.ts | 6 ++++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/mod.ts b/mod.ts
index bcd47ad..ac663e3 100644
--- a/mod.ts
+++ b/mod.ts
@@ -16,7 +16,7 @@ export function crc32(arr: Uint8Array | string): string {
     crc = (crc >>> 8) ^ temp;
   }
 
-  return numberToHex(crc ^ -1).padStart(8, "0");
+  return numberToHex(crc ^ -1);
 }
 
 export class Crc32Stream {
@@ -69,7 +69,7 @@ export class Crc32Stream {
 }
 
 export function numberToHex(n: number): string {
-  return (n >>> 0).toString(16);
+  return (n >>> 0).toString(16).padStart(8, "0");
 }
 
 export function hexToUint8Array(str: string): Uint8Array {
diff --git a/test.ts b/test.ts
index 2ecbe23..1fa2115 100644
--- a/test.ts
+++ b/test.ts
@@ -26,7 +26,8 @@ Deno.test("Crc32Stream", () => {
   const crc32Stream = new Crc32Stream();
   crc32Stream.append("d"); // 98dd4acc  === crc32("d")
   crc32Stream.append("e"); // 7d90298b  === crc32("de")
-  crc32Stream.append("n"); // 21f6953   === crc32("den")
+  crc32Stream.append("n"); // 021f6953  === crc32("den")
+  assertEquals(crc32Stream.crc32, "021f6953");
   assertEquals(crc32Stream.append("o"), crc32_deno);
   assertEquals(crc32Stream.crc32, crc32_deno);
   assertEquals(crc32Stream.crc32, crc32_deno);
@@ -35,7 +36,8 @@ Deno.test("Crc32Stream", () => {
 
   crc32Stream.append("d"); // 98dd4acc  === crc32("d")
   crc32Stream.append("e"); // 7d90298b  === crc32("de")
-  crc32Stream.append("n"); // 21f6953   === crc32("den")
+  crc32Stream.append("n"); // 021f6953  === crc32("den")
+  assertEquals(crc32Stream.crc32, "021f6953");
   assertEquals(crc32Stream.append("o"), crc32_deno);
   assertEquals(crc32Stream.crc32, crc32_deno);
   assertEquals(crc32Stream.crc32, crc32_deno);