Closure definition mismatch

Question

Created Feb ’21

Replies 16

Boosts 0

Views 1.6k

Participants 3

Greetings!

I try to port a framework written in Swift 5 to Swift 4.2. And encounter syntax error I can't understand.
Code:

Code Block  private static func ccAESKeyWrap(
        rawKey: Data,
        keyEncryptionKey: Data) -> (data: Data?, status: Int32) {
        let alg = CCWrappingAlgorithm(kCCWRAPAES)
        var wrappedKeyLength: size_t = CCSymmetricWrappedSize(alg, rawKey.count)
        var wrappedKey = Data(count: wrappedKeyLength)
        let status = wrappedKey.withUnsafeMutableBytes { (wrappedKeyBytes: UnsafeMutablePointer) in
            rawKey.withUnsafeBytes { (rawKeyBytes: UnsafePointer) in
                keyEncryptionKey.withUnsafeBytes { (keyEncryptionKeyBytes: UnsafePointer) -> Int32 in
                    guard
                        let wrappedKeyBytes = wrappedKeyBytes.bindMemory(to: UInt8.self).baseAddress,
                        let rawKeyBytes = rawKeyBytes.bindMemory(to: UInt8.self).baseAddress,
                        let keyEncryptionKeyBytes = keyEncryptionKeyBytes.bindMemory(to: UInt8.self).baseAddress
                    else {
                        return Int32(kCCMemoryFailure)
                    }
                    return CCSymmetricKeyWrap(
                        alg,
                        CCrfc3394_iv,
                        CCrfc3394_ivLen,
                        keyEncryptionKeyBytes,
                        keyEncryptionKey.count,
                        rawKeyBytes, rawKey.count,
                        wrappedKeyBytes, &wrappedKeyLength)
                }
            }
        }
        guard status == kCCSuccess else {
            return (nil, status)
        }
        wrappedKey.removeSubrange(wrappedKeyLength..<wrappedKey.count)
        return (wrappedKey, status)
    }

On string

Code Block keyEncryptionKey.withUnsafeBytes { (keyEncryptionKeyBytes: UnsafePointer) -> Int32 in

I got the error:
Cannot convert value of type '(UnsafePointer<>) -> Int32' to expected argument type '(UnsafePointer<>) -> '_

Could anyone tell me what do I do wrong ?

Boost

Answer 1

OOPer OP

Mar ’21

I am going to rollback all of the changes and continue develop on Swift 5.

Seems to be a reasonable decision. If you have some difficulties using the binary framework with Swift 5, you can utilize the forums, but it might be better for you to contact to the author of the framework.

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