We're trying to implement a backup/restore data feature in our business productivity iPad app using UIDocumentPickerViewController and AppleArchive, but discovered AppleArchive crashes instead of failing gracefully when decrypting a corrupt archive.
As described in forum post 765101, UIDocumentPickerViewController can handoff a corrupt copy of an archive to UIDocumentPickerDelegate under specific circumstances.
We've duplicated this behavior with iPadOS 16.6.1 and 17.7 when building our app with Xcode 15.4 targeting minimum deployment of iPadOS 16. We haven't tested this with the bleeding edge iPadOS 18.
Our app is primarily Objective-C, but it utilizes the Swift-based AppleArchive 'EncryptingAndDecryptingDirectories' sample code associated with WWDC21 session: 10233: Bring Encrypted Archives and Performance Improvements to Your App with Accelerate.
The WWDC21 'EncryptingAndDecryptingDirectories' Swift sample project crashes in a similar manner when a corrupt archive file created by UIDocumentPickerViewController is dropped into the sample app's window for decryption (see attached crash log).
Does anyone know if there's a workaround for the 'EncryptingAndDecryptingDirectories' sample project to prevent AppleArchive from crashing when decrypting a corrupt archive?
We built the 'EncryptingAndDecryptingDirectories' Swift sample project as a MacOS app with Xcode 15.4, then ran the sample app on MacOS Sonoma 14.4.1. In this test run we dragged a 56 MB corrupt archive (which was supposed to contain 788 MB of data) into the app's window, then entered its decryption key. Here's a DEBUG log when decrypting the corrupt archive file: BOOL _NSPersistentUIDeleteItemAtFileURL(NSURL *const __strong) Failed to stat item: file:///Users/dev987/Library/Containers/com.example.apple-samplecode.DirectoryEncryptionDecryption/Data/Library/Saved%20Application%20State/com.example.apple-samplecode.DirectoryEncryptionDecryption.savedState/restorecount.plist FAULT: determined it was necessary to configure to support remote view vibrancy [0x9e031800] reading segment data [0x9e042800] loading segment [0x9e01f400] decrypting segment [0x9e04a800] decrypting segment 0 [0xd7014800] worker proc reported an error [0x9e050400] SharedBufferWrite [0xbd008c00] istream read error [0xd7023400] consumer proc reported an error [0xd7023400] consumer proc reported an error [0x9e031800] reading segment data [0xbd014800] refill buffer failed [0xd7023400] consumer proc reported an error [0x9e042800] loading segment [0xbd052400] read error [0xd7014800] worker proc reported an error [0xd7014800] worker proc reported an error [0x90012c00] archive stream read error (blob) [0xd7023400] consumer proc reported an error [0xd7023400] consumer proc reported an error [0xd7023400] consumer proc reported an error [0xd7023400] consumer proc reported an error [0xd7023400] consumer proc reported an error [0xd7023400] consumer proc reported an error [0xd7023400] consumer proc reported an error [0xd7047400] Threads reported errors [0x9e06d800] Stream processing cancelled [0xc8173800] stream cancelled [0xc8185000] 1 entries failed to extract Here's the associated CRASH log: Thread 1: EXC_BAD_ACCESS (code=1, address=0x77) Thread 1 Queue : com.apple.main-thread (serial) #0 0x0000000000000077 in 0x00000077 () #1 0x00007ffc2f51df42 in AAArchiveStreamClose () #2 0x00007ffc30b670dc in ArchiveStream.__deallocating_deinit () #3 0x00007ff828775230 in _swift_release_dealloc () #4 0x00007ff828775bdb in bool swift::RefCounts>::doDecrementSlow<(swift::PerformDeinit)1>(swift::RefCountBitsT<(swift::RefCountInlinedness)1>, unsigned int) () #5 0x000000010a564945 in static ArchiverEncryptor.decrypt(sourceURL:encryptionKey:) at /Users/dev987/Documents/SwiftApps/EncryptingAndDecryptingDirectoriesMyMacTest/DirectoryEncryptionDecryption/ArchiverEncryptor.swift:264 #6 0x000000010a554fb8 in ContentView.submitBase64EncodedKeyData() at /Users/dev987/Documents/SwiftApps/EncryptingAndDecryptingDirectoriesMyMacTest/DirectoryEncryptionDecryption/ContentView.swift:142 #7 0x000000010a5588eb in closure #1 in closure #1 in closure #1 in ContentView.body.getter at /Users/dev987/Documents/SwiftApps/EncryptingAndDecryptingDirectoriesMyMacTest/DirectoryEncryptionDecryption/ContentView.swift:180 #8 0x00007ff925238f48 in ___lldb_unnamed_symbol112397 () #9 0x00007ff925dbe87d in ___lldb_unnamed_symbol195471 () #10 0x00007ff925dbe963 in ___lldb_unnamed_symbol195472 () #11 0x00007ff81b7062b6 in -[NSApplication(NSResponder) sendAction:to:from:] () #12 0x00007ff81b70612b in -[NSControl sendAction:to:] () #13 0x00007ff81b7bbe8e in -[NSTextField textDidEndEditing:] () #14 0x00007ff817ea9130 in __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ () #15 0x00007ff817f39b56 in ___CFXRegistrationPost_block_invoke () #16 0x00007ff817f39aa0 in _CFXRegistrationPost () #17 0x00007ff817e7904b in _CFXNotificationPost () #18 0x00007ff818e0fd3e in -[NSNotificationCenter postNotificationName:object:userInfo:] () #19 0x00007ff81b86e3b9 in -[NSTextView(NSPrivate) _giveUpFirstResponder:] () #20 0x00007ff81b7d9f94 in -[NSTextView doCommandBySelector:] () #21 0x00007ff81b7d9e49 in -[NSTextInputContext(NSInputContext_WithCompletion) doCommandBySelector:completionHandler:] () #22 0x00007ff81b70d6ef in -[NSKeyBindingManager(NSKeyBindingManager_MultiClients) interpretEventAsCommand:forClient:] () #23 0x00007ff81b71625e in __84-[NSTextInputContext _handleEvent:options:allowingSyntheticEvent:completionHandler:]_block_invoke_5 () #24 0x00007ff81c2aebd9 in __84-[NSTextInputContext _handleEvent:options:allowingSyntheticEvent:completionHandler:]_block_invoke_3.922 () #25 0x00007ff81b71604e in -[NSTextInputContext tryHandleEvent_HasMarkedText_withDispatchCondition:dispatchWork:continuation:] () #26 0x00007ff81c2aeb60 in __84-[NSTextInputContext _handleEvent:options:allowingSyntheticEvent:completionHandler:]_block_invoke.919 () #27 0x00007ff822a52232 in __TSMProcessRawKeyEventWithOptionsAndCompletionHandler_block_invoke_6 () #28 0x00007ff82290a46d in invocation function for block in DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) () #29 0x00007ff81c2a9d90 in __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke.321 () #30 0x00007ff81b70f3b8 in __55-[NSTextInputContext handleTSMEvent:completionHandler:]_block_invoke_2 () #31 0x00007ff81b70f33f in -[NSTextInputContext tryHandleTSMEvent_HasMarkedText_withDispatchCondition:dispatchWork:continuation:] () #32 0x00007ff81b70e9c6 in -[NSTextInputContext handleTSMEvent:completionHandler:] () #33 0x00007ff81b70e21d in _NSTSMEventHandler () #34 0x00007ff82289d573 in DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) () #35 0x00007ff82289c9bf in SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) () #36 0x00007ff82289c85e in SendEventToEventTargetWithOptions () #37 0x00007ff8228f5bb1 in SendTSMEvent_WithCompletionHandler () #38 0x00007ff8228f6065 in __SendUnicodeTextAEToUnicodeDoc_WithCompletionHandler_block_invoke () #39 0x00007ff8228f5eba in __SendFilterTextEvent_WithCompletionHandler_block_invoke () #40 0x00007ff8228f5c01 in SendTSMEvent_WithCompletionHandler () #41 0x00007ff8228f5a00 in SendFilterTextEvent_WithCompletionHandler () #42 0x00007ff8228f56c1 in SendUnicodeTextAEToUnicodeDoc_WithCompletionHandler () #43 0x00007ff8228f5473 in __utDeliverTSMEvent_WithCompletionHandler_block_invoke_2 () #44 0x00007ff8228f52d6 in __utDeliverTSMEvent_WithCompletionHandler_block_invoke () #45 0x00007ff8228f5125 in TSMKeyEvent_WithCompletionHandler () #46 0x00007ff8228f97e0 in __TSMProcessRawKeyEventWithOptionsAndCompletionHandler_block_invoke_5 () #47 0x00007ff8228f4ecc in __TSMProcessRawKeyEventWithOptionsAndCompletionHandler_block_invoke_4 () #48 0x00007ff8228f4d03 in __TSMProcessRawKeyEventWithOptionsAndCompletionHandler_block_invoke_3 () #49 0x00007ff8228f4aba in __TSMProcessRawKeyEventWithOptionsAndCompletionHandler_block_invoke_2 () #50 0x00007ff8228f485c in __TSMProcessRawKeyEventWithOptionsAndCompletionHandler_block_invoke () #51 0x00007ff8228e35fb in TSMProcessRawKeyEventWithOptionsAndCompletionHandler () #52 0x00007ff81c2aea57 in __84-[NSTextInputContext _handleEvent:options:allowingSyntheticEvent:completionHandler:]_block_invoke_3.917 () #53 0x00007ff81c2ae7b6 in __204-[NSTextInputContext tryTSMProcessRawKeyEvent_orSubstitution:dispatchCondition:setupForDispatch:furtherCondition:doubleSpaceSubstitutionCondition:doubleSpaceSubstitutionWork:dispatchTSMWork:continuation:]_block_invoke.881 () #54 0x00007ff81b70cd52 in -[NSTextInputContext tryTSMProcessRawKeyEvent_orSubstitution:dispatchCondition:setupForDispatch:furtherCondition:doubleSpaceSubstitutionCondition:doubleSpaceSubstitutionWork:dispatchTSMWork:continuation:] () #55 0x00007ff81b70c750 in -[NSTextInputContext _handleEvent:options:allowingSyntheticEvent:completionHandler:] () #56 0x00007ff81b70c1a2 in -[NSTextInputContext _handleEvent:allowingSyntheticEvent:] () #57 0x00007ff81b70c018 in -[NSView interpretKeyEvents:] () #58 0x00007ff81b70be65 in -[NSTextView keyDown:] () #59 0x00007ff925524291 in ___lldb_unnamed_symbol133719 () #60 0x00007ff925524433 in ___lldb_unnamed_symbol133721 () #61 0x00007ff81b679142 in -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] () #62 0x00007ff81b678d1f in -[NSWindow(NSEventRouting) sendEvent:] () #63 0x00007ff81be282b6 in -[NSApplication(NSEventRouting) sendEvent:] () #64 0x00007ff81b9e35c2 in -[NSApplication _handleEvent:] () #65 0x00007ff81b50b02a in -[NSApplication run] () #66 0x00007ff81b4deff1 in NSApplicationMain () #67 0x00007ff92496ff47 in ___lldb_unnamed_symbol56704 () #68 0x00007ff925067ad4 in ___lldb_unnamed_symbol103975 () #69 0x00007ff92542cf9f in static App.main() () #70 0x000000010a5662ae in static DirectoryEncryptionDecryptionApp.$main() () #71 0x000000010a566349 in main at /Users/dev987/Documents/SwiftApps/EncryptingAndDecryptingDirectoriesMyMacTest/DirectoryEncryptionDecryption/DirectoryEncryptionDecryptionApp.swift:11 #72 0x00007ff817a4b366 in start ()
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