46 lines
1.6 KiB
Java
46 lines
1.6 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.gossip.manager;
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import java.nio.ByteBuffer;
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public class UdpUtil {
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public static int readPacketLengthFromBuffer(byte [] buffer){
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int packetLength = 0;
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for (int i = 0; i < 4; i++) {
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int shift = (4 - 1 - i) * 8;
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packetLength += (buffer[i] & 0x000000FF) << shift;
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}
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return packetLength;
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}
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public static byte[] createBuffer(int packetLength, byte[] jsonBytes) {
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byte[] lengthBytes = new byte[4];
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lengthBytes[0] = (byte) (packetLength >> 24);
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lengthBytes[1] = (byte) ((packetLength << 8) >> 24);
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lengthBytes[2] = (byte) ((packetLength << 16) >> 24);
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lengthBytes[3] = (byte) ((packetLength << 24) >> 24);
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ByteBuffer byteBuffer = ByteBuffer.allocate(4 + jsonBytes.length);
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byteBuffer.put(lengthBytes);
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byteBuffer.put(jsonBytes);
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byte[] buf = byteBuffer.array();
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return buf;
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}
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}
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