flash as3 - 我需要在byteArray数据中进行二进制搜索

function binarySearch(byteArray:ByteArray, target:int):int {
    var left:int = 0;
    var right:int = byteArray.length - 1;
    while (left <= right) {
        var mid:int = (left + right) >> 1;
        byteArray.position = mid;
        var current:int = byteArray.readInt();
        if (current == target) {
            return mid;
        } else if (current< target) {
            left = mid + 1;
        } else {
            right = mid - 1;
        }
    }
    return -1;
}