Import of the watch repository from Pebble

src/fw/services/normal/app_cache.h

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+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "process_management/app_install_types.h"
+#include "system/status_codes.h"
+
+#include <stdbool.h>
+#include <stdint.h>
+
+//! @file app_cache.c
+//! AppCache
+//!
+//! The AppCache keeps track of a cache of the applications that have binaries that reside on the
+//! watch. When an app's binaries are removed from the watch, the entry with the same AppInstallId
+//! is removed from the AppCache.
+//!
+//! When the app storage space has run out, a call to the app cache will retrieve the entry that
+//! needs to be removed.
+
+//! Initializes the AppCache
+void app_cache_init(void);
+
+//! Adds a blank entry with the given AppInstallId and total size to the AppCache
+status_t app_cache_add_entry(AppInstallId app_id, uint32_t total_size);
+
+//! Removes an entry with the given AppInstallId from the AppCache
+status_t app_cache_remove_entry(AppInstallId app_id);
+
+//! Checks whether an entry with the given AppInstallId is in the AppCache.
+bool app_cache_entry_exists(AppInstallId app_id);
+
+//! Increments data stored about an entry with the given AppInstallId in the AppCache
+status_t app_cache_app_launched(AppInstallId app_id);
+
+//! Ask the app cache to free up n bytes in case other parts of the system need room in the
+//! filesystem
+status_t app_cache_free_up_space(uint32_t bytes_needed);
+
+//! Clears the entire AppCache
+//! NOTE: Must be called from PebbleTask_KernelBackground
+void app_cache_flush(void);