/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*/

package org.eclipse.webdav.internal.authentication;

/**
 * This class provides a function that converts byte arrays to their
 * equivalent hexadecimal string.
 */
public final class HexConverter {
    /**
     * Converts the given byte array to its equivalent hexadecimal string
     * and returns the result.
     */
    public static String toHex(byte[] arr) {
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < arr.length; ++i) {
            buf.append(Integer.toHexString((arr[i] >> 4) & 0x0f));
            buf.append(Integer.toHexString(arr[i] & 0x0f));
        }
        return buf.toString();
    }

    /**
     * Converts the given int array to its equivalent hexadecimal string
     * and returns the result.
     */
    public static String toHex(int[] arr) {
        StringBuffer buf = new StringBuffer();
        for (int i = 0; i < arr.length; ++i) {
            buf.append(Integer.toHexString((arr[i] >> 28) & 0x0000000f));
            buf.append(Integer.toHexString((arr[i] >> 24) & 0x0000000f));
            buf.append(Integer.toHexString((arr[i] >> 20) & 0x0000000f));
            buf.append(Integer.toHexString((arr[i] >> 16) & 0x0000000f));
            buf.append(Integer.toHexString((arr[i] >> 12) & 0x0000000f));
            buf.append(Integer.toHexString((arr[i] >> 8) & 0x0000000f));
            buf.append(Integer.toHexString((arr[i] >> 4) & 0x0000000f));
            buf.append(Integer.toHexString((arr[i]) & 0x0000000f));
        }
        return buf.toString();
    }
}