How to decode/decompress Apple's vCard notes

I have vCards that were exported from the Contacts app of Mac OS X 10.8.2. From what I can tell, Apple exported the notes with RTF that was compressed with LZF and converted the compressed data to base 64 before exporting the vCard. I'm trying to restore an export but the current version (Sonoma 14.2.1) ignores the notes field of the vCard. (I sanitized the contact information but didn't touch the X-APPLE-OL-NOTE section.) Here's an example vCard: BEGIN:VCARD VERSION:3.0 PRODID:-//Apple Inc.//Mac OS X 10.8.2//EN N:;Jane;;;(Baker) Smith FN:Jane (Baker) Smith TEL;type=HOME;type=VOICE;type=pref:(123) 123-4567 TEL;type=CELL;type=VOICE:(321) 321-7654 item1.ADR;type=HOME;type=pref:;;123 Any Street;Any Town;XX;T1T 1T1;Canada item1.X-ABADR:ca UID:CZTL-07DB0A0E-002E-0202-FF32-00816 X-ABUID:6EB029FB-BBBB-4242-A054-C5F4392245BD:ABPerson X-EVOLUTION-FILE-AS:Smith, Jane X-APPLE-OL-MAPPING-INFO:1 X-APPLE-OL-NOTE;TYPE=text/rtf;X-COMPRESSION=X-OL;X-HASH=03c582c83054be62e05 e09df57aff23b;X-HASHALGORITHM=X-zMD5;ENCODING=B:fAAAAI0AAABMWkZ1YU/S1F8AAwF AAHIB9wK3VgSQZC0AcGECgAqScASQdzEYMTA0AUAPc2g5OIYwAUAAwHJnbDEMAd0Q4nIRMgsDDN A1DAEM0F0P4DYC0QoRAUBpAUB1VGxuAiBlAgBjAUBjAQu1IChBYnJhaGBhbXNlKQ9AFcA= END:VCARD The note in the above vCard is "(Abrahamse)". I've attempted to read the Note with the following Swift code (the above vCard is stored on disk as test.vcf): import Foundation import Contacts func readVCard(filePath: String) { do { // Read the content of the vCard file let vCardContent = try String(contentsOfFile: filePath, encoding: .utf8) // Parse the vCard data if let data = vCardContent.data(using: .utf8) { let contacts = try CNContactVCardSerialization.contacts(with: data) // Print information for each contact for contact in contacts { print("Contact Identifier: \(contact.identifier)") print("Given Name: \(contact.givenName)") for phoneNumber in contact.phoneNumbers { print("Phone Number: \(phoneNumber.value.stringValue)") } print("Notes: \(contact.note)") } } } catch { print("Error reading the vCard file: \(error.localizedDescription)") } } // Example usage: replace "test.vcf" with the actual path to your vCard file let vCardFilePath = "test.vcf" readVCard(filePath: vCardFilePath) The output of running the code is below -- the note information is not extracted properly: Contact Identifier: 2035C9D6-6A76-49F4-A5ED-C2C073A517CE:ABPerson Given Name: Jane Phone Number: (123) 123-4567 Phone Number: (321) 321-7654 Notes: Program ended with exit code: 0 I used the base64 command at the terminal to decode the notes from 2 vcards and the first few bytes were (from xxd): test.vcf: 00000000: 7c00 0000 8d00 0000 4c5a 4675 614f d2d4 |.......LZFuaO.. second.vcf: 00000000: 5e1f 0000 4f4e 0000 4c5a 4675 59f1 0eeb ^...ON..LZFuY... So the main overlap is 4c5a 4675, corresponding to LZFu. I wasn't able to match that up with the hints on the [Identifying Compression Algorithms](https://github.com/frizb/FirmwareReverseEngineering/blob/master/IdentifyingCompressionAlgorithms.md) page. How could I extract the note correctly?