com.github.housepower.jdbc.misc.BytesUtil Maven / Gradle / Ivy

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     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 com.github.housepower.jdbc.misc;

public class BytesUtil {

    public static byte[] longToBytes(long l) {
        byte[] result = new byte[Long.BYTES];
        for (int i = Long.BYTES - 1; i >= 0; i--) {
            result[i] = (byte) (l & 0xFF);
            l >>= Byte.SIZE;
        }
        return result;
    }


    public static byte[] longsToBytes(final long []longArray) {
        byte[] result = new byte[Long.BYTES * longArray.length];
        for (int index = 0; index < longArray.length; index++) {
            long l = longArray[index];

            for (int i = Long.BYTES - 1; i >= 0; i--) {
                result[index * Long.BYTES + i] = (byte) (l & 0xFF);
                l >>= Byte.SIZE;
            }
        }
        return result;
    }

    public static long bytesToLong(final byte[] b) {
        long result = 0;
        for (int i = 0; i < Long.BYTES; i++) {
            result <<= Byte.SIZE;
            result |= (b[i] & 0xFF);
        }
        return result;
    }
}