From c6045e6b3ec81b994b6ec75a1ae559fa6608edba Mon Sep 17 00:00:00 2001
From: nyanpasu64 <nyanpasu64@tuta.io>
Date: Thu, 25 May 2023 20:55:48 -0700
Subject: [PATCH] Skip overwriting slots.bin if we fail to read the existing
 contents

Hopefully should guard against slots.bin corruption when the GBS-C
crashes.
---
 gbs-control.ino | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gbs-control.ino b/gbs-control.ino
index 6ad50269..fb815e08 100644
--- a/gbs-control.ino
+++ b/gbs-control.ino
@@ -9560,7 +9560,11 @@ void startWebserver()
                 File slotsBinaryFileRead = SPIFFS.open(SLOTS_FILE, "r");
 
                 if (slotsBinaryFileRead) {
-                    slotsBinaryFileRead.read((byte *)&slotsObject, sizeof(slotsObject));
+                    auto read = slotsBinaryFileRead.read((byte *)&slotsObject, sizeof(slotsObject));
+                    if (read < sizeof(slotsObject)) {
+                        Serial.print("Failed to read " SLOTS_FILE "!");
+                        goto fail;
+                    }
                     slotsBinaryFileRead.close();
                 } else {
                     File slotsBinaryFileWrite = SPIFFS.open(SLOTS_FILE, "w");