+ (NSUInteger)bytesOfFile:(NSString *)filePath;
+ (NSString *)contentTypeOfFile:(NSString *)filePath error:(NSError **)error;
+ (BOOL)safeCreateDirectory:(NSString *)directoryPath error:(NSError **)error;
++ (void)removeContentsAtPath:(NSString *)dirPath;
+ (BOOL)isContentTypeDirectory:(NSString *)contentType;
+ (BOOL)objectExistsAtPithos:(ASIPithos *)pithos containerName:(NSString *)containerName objectName:(NSString *)objectName
error:(NSError **)error isDirectory:(BOOL *)isDirectory sharingAccount:(NSString *)sharingAccount;