Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

public class Main {
    public static byte[] normalizeArray(byte[] bytes, int expectedLength) throws Exception {
        if (bytes.length > expectedLength) {
            boolean invalid = false;
            for (int i = bytes.length - 1 - expectedLength; i >= 0; i--) {
                if (bytes[i] != 0) {
                    invalid = true;
                    break;
                }
            }
            if (invalid)
                throw new Exception("Longer byte array than expected by caller.");
        }

        if (bytes.length == expectedLength)
            return bytes;

        return preAppendHighZeroPadding(bytes, expectedLength - bytes.length);
    }

    public static byte[] preAppendHighZeroPadding(byte[] bytes, int zeroes) {
        byte[] result = new byte[bytes.length + zeroes];
        for (int i = 0; i < result.length; i++) {
            if (i >= zeroes) {
                result[i] = bytes[i - zeroes];
            } else {
                result[i] = 0;
            }
        }
        return result;
    }
}