Published on March 8, 2014
File System in iOS Prepared By Pratik R Detroja 131060753005
File System Basics • The iOS file system is geared toward apps running on their own • To keep the system simple, users of iOS devices do not have direct access to the file system and apps are expected to follow this convention. • Every App Is an Island
Exceptions • Public system interfaces – Contacts – Calendars – Photo library • An App can use such public system interfaces provided that the user approves its access.
iOS Standard Directories • <Application_Home> /AppName .app – This is the bundle directory containing the app itself. • <Application_Home> /Documents/ – This directory is used to store critical user documents and app data files. • <Application_Home> /Documents/Inbox – Your app can read and delete files in this directory but cannot create new files or write to existing files.
iOS Standard Directories • <Application_Home> /Library/ – This directory is the top-level directory for files that are not user data files. – You can create custom subdirectories for files you want backed up but not exposed to the user. – Do not use this directory for user data files. • <Application_Home> /tmp/ – Use this directory to write temporary files that do not need to persist between launches of your app. – Your app should remove files from this directory when it determines they are no longer needed
Where You Should Put Your App’s Files • To prevent the syncing and backup processes on iOS devices from taking a long time, be selective about where you place files inside your app’s home directory. • Apps that store large files can slow down the process of backing up to iTunes or iCloud. • Put user data in the <Application_Home> /Documents/. User data is any data that cannot be recreated by your app, such as user documents and other user-generated content
Understanding SandBox • The purpose of a sandbox is to limit the damage that a compromised app can cause to the system. • Sandboxes do not prevent attacks from happening to a particular app and it is still your responsibility to code defensively to prevent attacks. • For example, if your app does not validate user input and there is an exploitable buffer overflow in your input-handling code, an attacker could still hijack your app or cause it to crash. • The sandbox only prevents the hijacked app from affecting other apps and other parts of the system.
Reference • http://code.tutsplus.com/tutorials/data-persistence-and-sandboxing-onios--mobile-14078 – Auther : Bart Jacobs • https://developer.apple.com/library/ios/documentation/FileManagement/ Conceptual/FileSystemProgrammingGuide/Introduction/Introduction.html • https://developer.apple.com/library/mac/documentation/Security/Concept ual/AppSandboxDesignGuide/AboutAppSandbox/AboutAppSandbox.html • https://developer.apple.com/library/ios/documentation/iPhone/Conceptua l/iPhoneOSProgrammingGuide/Introduction/Introduction.html
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