mutating func oneShotDeflate()

in Sources/NIOHTTPCompression/HTTPCompression.swift [116:137]

• 18 lines of code
• 2 McCabe index (conditional complexity)

    mutating func oneShotDeflate(from: inout ByteBuffer, to: inout ByteBuffer, flag: Int32) {
        defer {
            self.avail_in = 0
            self.next_in = nil
            self.avail_out = 0
            self.next_out = nil
        }

        from.readWithUnsafeMutableReadableBytes { dataPtr in
            let typedPtr = dataPtr.baseAddress!.assumingMemoryBound(to: UInt8.self)
            let typedDataPtr = UnsafeMutableBufferPointer(start: typedPtr,
                                                          count: dataPtr.count)

            self.avail_in = UInt32(typedDataPtr.count)
            self.next_in = typedDataPtr.baseAddress!

            let rc = deflateToBuffer(buffer: &to, flag: flag)
            precondition(rc == Z_OK || rc == Z_STREAM_END, "One-shot compression failed: \(rc)")

            return typedDataPtr.count - Int(self.avail_in)
        }
    }