Most Efficient Conversion Between Uscd Pascal Style Strings And Swift Strings Mới Cập Nhật

To convert a string in USCD Pascal style to a Swift string, you can use the String constructor that takes a null-terminated C string as an argument. You can first convert the USCD Pascal string to a null-terminated C string by adding a null terminator at the end of the string.

Here is an example function that performs the conversion:

swift
func fromPascalString(_ pascalString: UnsafePointer<Int8>) -> String {
    let length = Int(pascalString.pointee)
    let buffer = UnsafeBufferPointer(start: pascalString + 1, count: length)
    return String(cString: buffer.baseAddress!)
}

And here is an example of how to use this function:

swift
let pascalString: [Int8] = [5, 72, 101, 108, 108, 111]
let swiftString = fromPascalString(pascalString)
print(swiftString) // "Hello"

To convert a Swift string to a USCD Pascal style string, you can first convert the Swift string to a null-terminated C string using the cString(using:) method, and then create a new buffer that contains the length of the string followed by the null-terminated C string.

Here is an example function that performs the conversion:

swift
func toPascalString(_ swiftString: String) -> [Int8] {
    let cString = swiftString.cString(using: .utf8)!
    var pascalString = [Int8(cString.count - 1)]
    pascalString.append(contentsOf: cString.dropLast())
    return pascalString
}

And here is an example of how to use this function:

swift
let swiftString = "Hello"
let pascalString = toPascalString(swiftString)
print(pascalString) // [5, 72, 101, 108, 108, 111]