Swift equivalent to Objective-C FourCharCode single quote literals (e.g. 'TEXT')

Question

I am trying replicate some Objective C cocoa in Swift. All is good until I come across the following:

// Set a new type and creator:
unsigned long type = \'TEXT\         


        

Answer 1

Here's a simple function

func mbcc(foo: String) -> Int
{
    let chars = foo.utf8
    var result: Int = 0
    for aChar in chars
    {
        result = result << 8 + Int(aChar)
    }
    return result
}

let a = mbcc("TEXT")

print(String(format: "0x%lx", a)) // Prints 0x54455854

It will work for strings that will fit in an Int. Once they get longer it starts losing digits from the top.

If you use

result = result * 256 + Int(aChar)

you should get a crash when the string gets too big instead.