text: // Copyright 2022 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
  //
  //     https://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.
  
  #ifndef NEARBY_PLATFORM_PERSISTENCE_H
  #define NEARBY_PLATFORM_PERSISTENCE_H
  
  #include "nearby.h"
  
  #ifdef __cplusplus
  extern "C" {
  #endif /* __cplusplus */
  
  typedef enum {
    kStoredKeyAccountKeyList,
    kStoredKeyPersonalizedName
  } nearby_fp_StoredKey;
  
  // Loads stored key
  //
  // key    - Type of key to fetch.
  // output - Buffer to contain retrieved key.
  // length - On input, contains the size of the output buffer.
  //          On output, contains the Length of key.
  nearby_platform_status nearby_platform_LoadValue(nearby_fp_StoredKey key,
                                                   uint8_t* output,
                                                   size_t* length);
  
  // Saves stored key
  //
  // key    - Type of key to store.
  // output - Buffer containing key to store.
  // length - Length of key.
  nearby_platform_status nearby_platform_SaveValue(nearby_fp_StoredKey key,
                                                   const uint8_t* input,
                                                   size_t length);
  
  // Initializes persistence module
  nearby_platform_status nearby_platform_PersistenceInit();
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* NEARBY_PLATFORM_PERSISTENCE_H */
  