From cceb5afae840861a29165e5368a967ed56d59d37 Mon Sep 17 00:00:00 2001
From: Christian Hagenest <c.hagenest@pm.me>
Date: Sat, 2 Apr 2022 17:32:51 +0200
Subject: [PATCH] add save and load state functions to nes.embed.js

---
 nes-embed.js | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/nes-embed.js b/nes-embed.js
index 27aabd5..bec024b 100644
--- a/nes-embed.js
+++ b/nes-embed.js
@@ -130,3 +130,26 @@ function nes_load_url(canvas_id, path){
 
 document.addEventListener('keydown', (event) => {keyboard(nes.buttonDown, event)});
 document.addEventListener('keyup', (event) => {keyboard(nes.buttonUp, event)});
+
+function saveState(){
+	try{
+		var saveData = JSON.stringify(nes.toJSON());
+		localStorage.setItem(romName, saveData);
+	}catch(oException){
+		if(oException.name == 'QuotaExceededError'){
+			console.log('localStorage out of memory');
+			localStorage.clear();
+			localStorage.setItem(calcMD5(rompath), saveData);
+		}
+	}
+}
+
+function loadState(){
+	var saveData = localStorage.getItem(romName);
+	if( saveData == null ) {
+    	console.log("nothing to load");
+		return;
+}
+	var decodedData = JSON.parse(saveData);
+	nes.fromJSON(decodedData);
+}
\ No newline at end of file