yhpgの「異星の電光掲示板」をSwiftで

#!/usr/bin/env xcrun -sdk macosx10.10 swift
//http://qiita.com/Nabetani/items/cba03c96d1ea55f6e861
//http://nabetani.sakura.ne.jp/hena/ord15elebubo/
import Darwin
var v:[UInt]=[0,0] // I cannot specify the array size...
var i=0,j=0
for ;(withUnsafePointer(&v[0]){vscanf("%08x",getVaList([COpaquePointer($0)]))}>0); {
    withUnsafePointer(&v[1]){vscanf("/%08x",getVaList([COpaquePointer($0)]))}
    var a:[[Int]]=[[],[]]
    for i=0;i<2;i++ {
        for j=0;j<32;j++ {
            a[i].append( Int((v[i]>>(31-j))&1) )
        }
        a[i].append(0)
        a[i].append(0)
    }

    for i=0;i<32; {
        if a[0][i] == 0 && a[1][i] == 0 {
            i++
        } else if a[0][i] != 0 && a[1][i] != 0 { //need space; otherwise treated as "a[0][i]!"
            if a[0][i+1] != 0 {
                if a[0][i+2] != 0 {
                    print("N")
                    i+=3
                } else {
                    print("R")
                    i+=2
                }
            } else if a[1][i+1] != 0 {
                if a[1][i+2] != 0 {
                    print("U")
                    i+=3
                }else{
                    print("L")
                    i+=2
                }
            }
        } else if a[0][i] != 0 {
            if a[0][i+2] != 0 {
                print("T")
                i+=3
            } else { //if a[1][i+2] != 0
                print("Z")
                i+=3
            }
        } else {
            if a[0][i+2] != 0 {
                print("S")
                i+=3
            } else {
                print("J")
                i+=2
            }
        }
    }
    println()
    fflush(stdout)
}