From d02511cb206c85f5f7ae1a88ffb28b34fe0fda6d Mon Sep 17 00:00:00 2001
From: Christian Emmer <10749361+emmercm@users.noreply.github.com>
Date: Tue, 16 Jul 2024 19:07:52 -0700
Subject: [PATCH] Fix: enable CRC32 checksums when patch files are provided
 (#1217)

---
 src/igir.ts       | 5 +++++
 test/igir.test.ts | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/src/igir.ts b/src/igir.ts
index f359357d5..8a34025d2 100644
--- a/src/igir.ts
+++ b/src/igir.ts
@@ -287,6 +287,11 @@ export default class Igir {
     const minimumChecksum = this.options.getInputMinChecksum() ?? ChecksumBitmask.CRC32;
     let matchChecksum = minimumChecksum;
 
+    if (this.options.getPatchFileCount() > 0) {
+      matchChecksum |= ChecksumBitmask.CRC32;
+      this.logger.trace('using patch files, enabling CRC32 file checksums');
+    }
+
     if (this.options.shouldDir2Dat()) {
       Object.keys(ChecksumBitmask)
         .filter((bitmask): bitmask is keyof typeof ChecksumBitmask => Number.isNaN(Number(bitmask)))
diff --git a/test/igir.test.ts b/test/igir.test.ts
index 004a8a14a..040fb3f27 100644
--- a/test/igir.test.ts
+++ b/test/igir.test.ts
@@ -8,6 +8,7 @@ import Igir from '../src/igir.js';
 import DATScanner from '../src/modules/datScanner.js';
 import ArrayPoly from '../src/polyfill/arrayPoly.js';
 import fsPoly from '../src/polyfill/fsPoly.js';
+import { ChecksumBitmask } from '../src/types/files/fileChecksums.js';
 import FileFactory from '../src/types/files/fileFactory.js';
 import Options, { GameSubdirMode, OptionsProps, RomFixExtension } from '../src/types/options.js';
 import ProgressBarFake from './console/progressBarFake.js';
@@ -707,6 +708,7 @@ describe('with explicit DATs', () => {
         commands: ['copy', 'extract', 'test'],
         dat: [path.join(inputTemp, 'dats', '*')],
         input: [path.join(inputTemp, 'roms')],
+        inputMinChecksum: ChecksumBitmask[ChecksumBitmask.MD5].toLowerCase(),
         patch: [path.join(inputTemp, 'patches')],
         output: outputTemp,
         dirDatName: true,