Calculate number of bits for Big Integer

NumberOfBits.swift

// Playground - noun: a place where people can play

import Foundation

func numberOfBits(bytes:[Byte]) -> Int {
    if (bytes.count == 0) {
        return 0;
    }
    
    var toRemove = 0;
    for (toRemove = 0; toRemove < bytes.count; toRemove++) {
        if (bytes[toRemove] != 0x00) {
            break;
        }
    }

    // find most significant bit index
    var bitIdx = 0;
    let first = bytes[toRemove]
    var value = first
    while (value != 0) {
        bitIdx++
        value = value >> 1;
    }
    
    return bitIdx + ((bytes.count - toRemove - 1) * 8)
}

let bigIntegerBytes:[Byte] = [0x01,0x00,0x01]
numberOfBits(bigIntegerBytes)