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RTFD Bug

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README.md

This bug shows an inconsistency in RTFD serialization.

Bug report: #FB12302537

📱 Environment

Xcode Version 14.3.1 (14E300c) macOS 13.4 (22F66)

🐾 Steps to reproduce

  1. Serialize the RTFD document with images to Data using NSAttributedString.rtfd(from:) and write it to a file.
  2. Read data from that file.
  3. Create a new NSAttributedString using .init(rtfd:). Use Data from #2.
  4. Serialize it again using NSAttributedString.rtfd(from:).
  5. Compare the initial Data and the new Data.

🤔 Actual result

There is a few bytes difference between those two. It happens only if you include some images in the RTFD.

image

It looks like the current time is stored for image attachements. Probably a creation/modification date? Every time I run this code the byte that differs is increased like a timer.

🙏🏻 Expected result

For the same input, we should always get the same output.

👨‍💻 Sample Code

let path = URL(filePath: FileManager.default.currentDirectoryPath).appendingPathComponent("sample.data")

let oldRtfdData = try! Data(contentsOf: path)
let attr = NSAttributedString(rtfd: oldRtfdData, documentAttributes: nil)!
let newRtfdData = attr.rtfd(from: .init(location: 0, length: attr.length))!

// Even if you overwrite data, the next time it will be again different.
// try! newRtfdData.write(to: path)

let diff = zip(oldRtfdData, newRtfdData)
    .filter {
        if $0 != $1 { print("\($0) != \($1)") }
        return $0 != $1
    }
    .count

print(diff)
print(oldRtfdData == newRtfdData)