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 Copyright (c) 2015-2021 Spotify AB.
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership.  The ASF licenses this file
 to you 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.
#import <Foundation/Foundation.h>
typedef long long SPTPersistentCacheDiskSize;
extern const NSUInteger SPTPersistentCacheFileManagerSubDirNameLength;
@class SPTPersistentCacheOptions;
NS_ASSUME_NONNULL_BEGIN
 An object that encapsulates file-related operations of SPTPersistentCache.
@interface SPTPersistentCacheFileManager : NSObject
/// The total amount of bytes used by the cache given the reciever’s options.
@property (nonatomic, readonly) NSUInteger totalUsedSizeInBytes;
- (instancetype)init NS_UNAVAILABLE;
+ (instancetype)new NS_UNAVAILABLE;
 Initializes a new file manager set with specific options. 
 @param options Options of the permanent cache.
- (instancetype)initWithOptions:(SPTPersistentCacheOptions *)options NS_DESIGNATED_INITIALIZER;
 Creates the directory that will be used to persist the cached data. Returns YES if the operation is successful, 
 Or NO otherwise.
- (BOOL)createCacheDirectory;
 Returns the path for the subdirectory containing the data associated to a specific key.
 @param key Key of the data you are looking for.
- (NSString *)subDirectoryPathForKey:(NSString *)key;
 Returns the path for the data associated to a specific key.
 @param key Key of the data you are looking for.
- (NSString *)pathForKey:(NSString *)key;
 Removes all data files in the cache.
- (void)removeAllData;
 Removes the associated cached file for a key.
 @param key Key of the data you are looking for.
- (void)removeDataForKey:(NSString *)key;
 Based on a specific cache size, return a size optimized for the disk space. 
 @param currentCacheSize Cache size to be optimized
- (SPTPersistentCacheDiskSize)optimizedDiskSizeForCacheSize:(SPTPersistentCacheDiskSize)currentCacheSize;
 Returns the size of some data located at a specific path.
 @param filePath Path of a specific file.
- (NSUInteger)getFileSizeAtPath:(NSString *)filePath;
NS_ASSUME_NONNULL_END

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SPTPersistentCacheFileManager.h

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