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fix: cache-buster hash is always 6 characters #188

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fix: cache-buster hash is always 6 characters #188

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dc1e2f9
fix: pad crc32 hex in getHash so the hash is always 6 characters
CyberDex Nov 10, 2026
4471550
test: update manifest hashes renamed by the getHash padding fix
CyberDex Nov 10, 2026
a4832da
test: update spine atlas hashes renamed by the getHash padding fix
CyberDex Nov 10, 2026
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3 changes: 2 additions & 1 deletion packages/assetpack/src/core/utils/getHash.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,8 @@ export function getHash(input: string | Buffer): string {
input = fs.readFileSync(input);
}

const checksumHex = crc32.crc32(input).toString(16);
// Pad to 8 hex digits: Buffer.from drops the last digit of an odd-length hex string.
const checksumHex = crc32.crc32(input).toString(16).padStart(8, '0');

return Buffer.from(checksumHex, 'hex').toString('base64url');
}
22 changes: 22 additions & 0 deletions packages/assetpack/test/core/Utils.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,9 @@ import { describe, expect, it } from 'vitest';
import { AssetPack } from '../../src/core/AssetPack.js';
import { extractTagsFromFileName } from '../../src/core/utils/extractTagsFromFileName.js';
import { generateCacheName } from '../../src/core/utils/generateCacheName.js';
import { getHash } from '../../src/core/utils/getHash.js';
import { createAssetPipe, createFolder, getCacheDir, getInputDir, getOutputDir } from '../utils/index.js';
import crc32 from '@node-rs/crc32';

import type { Asset } from '../../src/core/Asset.js';
import type { AssetPipe } from '../../src/core/index.js';
Expand Down Expand Up @@ -208,4 +210,24 @@ describe('Utils', () => {

expect(cacheName3).toEqual('ab900fa81d7121ea46bd2eafe9e826633c1c48a0');
});

it('should always return a 6 character hash', () => {
const findInput = (accept: (crc: number) => boolean) => {
for (let i = 0; ; i++) {
const buffer = Buffer.from(`asset-${i}`);

if (accept(crc32.crc32(buffer))) return buffer;
}
};

// crc32 values with 1, 2 and 3 leading zero hex digits
for (const limit of [0x10000000, 0x1000000, 0x100000]) {
expect(getHash(findInput((crc) => crc < limit))).toMatch(/^[\w-]{6}$/);
}

// hashes without a leading zero are unchanged
const buffer = findInput((crc) => crc >= 0x10000000);

expect(getHash(buffer)).toBe(Buffer.from(crc32.crc32(buffer).toString(16), 'hex').toString('base64url'));
});
});
12 changes: 6 additions & 6 deletions packages/assetpack/test/manifest/Manifest.test.ts
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Expand Up @@ -630,10 +630,10 @@ describe('Manifest', () => {
src: [
{ src: 'bundle/sprite-vUcaag@0.5x.astc.ktx', progressSize: 4.98 },
{ src: 'bundle/sprite-TZpmeQ.astc.ktx', progressSize: 16.57 },
{ src: 'bundle/sprite-sDtC@0.5x.png', progressSize: 5.21 },
{ src: 'bundle/sprite-KdyNpA@0.5x.webp', progressSize: 3.78 },
{ src: 'bundle/sprite-k07jiw.png', progressSize: 14.49 },
{ src: 'bundle/sprite-3CLG.webp', progressSize: 8.2 },
{ src: 'bundle/sprite-CwO0Lg@0.5x.png', progressSize: 5.21 },
{ src: 'bundle/sprite-ANwixg.webp', progressSize: 8.2 },
],
data: {
tags: {
Expand All @@ -645,7 +645,7 @@ describe('Manifest', () => {
alias: ['bundle/tps'],
src: [
{ src: 'bundle/tps-RzSARA-0@0.5x.astc.json', progressSize: 26.52 },
{ src: 'bundle/tps-Ktro9A-0@0.5x.png.json', progressSize: 21.3 },
{ src: 'bundle/tps-qrwSUA-0@0.5x.png.json', progressSize: 21.3 },
{ src: 'bundle/tps-iS-Jog-0@0.5x.webp.json', progressSize: 19.45 },
{ src: 'bundle/tps-G92JcQ-0.png.json', progressSize: 71.01 },
{ src: 'bundle/tps-g4NIDQ-0.astc.json', progressSize: 90.82 },
Expand Down Expand Up @@ -697,8 +697,8 @@ describe('Manifest', () => {
{
alias: ['spine/dragon.atlas'],
src: [
{ src: 'spine/dragon-VMxv5A@0.5x.atlas', progressSize: 0.86 },
{ src: 'spine/dragon-bOhE1A.atlas', progressSize: 0.89 },
{ src: 'spine/dragon-_efU3A@0.5x.atlas', progressSize: 0.86 },
],
data: {
tags: {
Expand Down Expand Up @@ -1951,7 +1951,7 @@ describe('Manifest', () => {
{ src: 'bundle/sprite-vUcaag@0.5x.astc.ktx', progressSize: 4.98 },
{ src: 'bundle/sprite-TZpmeQ.astc.ktx', progressSize: 16.57 },
{ src: 'bundle/sprite-KdyNpA@0.5x.webp', progressSize: 3.78 },
{ src: 'bundle/sprite-3CLG.webp', progressSize: 8.2 },
{ src: 'bundle/sprite-ANwixg.webp', progressSize: 8.2 },
],
data: { tags: { m: true } },
},
Expand Down Expand Up @@ -2017,10 +2017,10 @@ describe('Manifest', () => {
{
alias: ['spine/dragon.atlas'],
src: [
{ src: 'spine/dragon-nYsr1g@0.5x.webp.atlas', progressSize: 0.87 },
{ src: 'spine/dragon-JospZg@0.5x.astc.atlas', progressSize: 0.87 },
{ src: 'spine/dragon-gYS0Qg.webp.atlas', progressSize: 0.89 },
{ src: 'spine/dragon-9M9x8w.astc.atlas', progressSize: 0.89 },
{ src: 'spine/dragon-672U@0.5x.webp.atlas', progressSize: 0.86 },
],
data: { tags: { spine: true }, spine: true },
},
Expand Down
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