Fix new save reader/writer functions

api/savedata-helper.go

@@ -16,7 +16,7 @@ func readSystemSaveData(uuid []byte) (defs.SystemSaveData, error) {
 
 	file, err := os.Open("userdata/" + hex.EncodeToString(uuid) + "/system.pzs")
 	if err != nil {
-		return system, fmt.Errorf("failed to open save file: %s", err)
+		return system, fmt.Errorf("failed to open save file for reading: %s", err)
 	}
 
 	defer file.Close()
@@ -46,7 +46,7 @@ func readSessionSaveData(uuid []byte, slotID int) (defs.SessionSaveData, error)
 
 	file, err := os.Open(fmt.Sprintf("userdata/%s/%s.pzs", hex.EncodeToString(uuid), fileName))
 	if err != nil {
-		return session, fmt.Errorf("failed to open save file: %s", err)
+		return session, fmt.Errorf("failed to open save file for reading: %s", err)
 	}
 
 	defer file.Close()

api/savedata.go

@@ -76,16 +76,20 @@ func handleSavedataUpdate(uuid []byte, slot int, save any) error {
 			return fmt.Errorf("failed to create userdata folder: %s", err)
 		}
 
-		file, err := os.OpenFile("userdata/"+hexUUID+"/system.pzs", os.O_WRONLY | os.O_TRUNC, 0644)
+		file, err := os.OpenFile("userdata/"+hexUUID+"/system.pzs", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
 		if err != nil {
 			return fmt.Errorf("failed to open save file for writing: %s", err)
 		}
 
+		defer file.Close()
+
 		zstdEncoder, err := zstd.NewWriter(file)
 		if err != nil {
 			return fmt.Errorf("failed to create zstd encoder: %s", err)
 		}
 
+		defer zstdEncoder.Close()
+
 		err = gob.NewEncoder(zstdEncoder).Encode(save)
 		if err != nil {
 			return fmt.Errorf("failed to serialize save: %s", err)
@@ -105,16 +109,20 @@ func handleSavedataUpdate(uuid []byte, slot int, save any) error {
 			return fmt.Errorf(fmt.Sprintf("failed to create userdata folder: %s", err))
 		}
 
-		file, err := os.OpenFile(fmt.Sprintf("userdata/%s/%s.pzs", hexUUID, fileName), os.O_WRONLY | os.O_TRUNC, 0644)
+		file, err := os.OpenFile(fmt.Sprintf("userdata/%s/%s.pzs", hexUUID, fileName), os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0644)
 		if err != nil {
 			return fmt.Errorf("failed to open save file for writing: %s", err)
 		}
 
+		defer file.Close()
+
 		zstdEncoder, err := zstd.NewWriter(file)
 		if err != nil {
 			return fmt.Errorf("failed to create zstd encoder: %s", err)
 		}
 
+		defer zstdEncoder.Close()
+
 		err = gob.NewEncoder(zstdEncoder).Encode(save)
 		if err != nil {
 			return fmt.Errorf("failed to serialize save: %s", err)