1 /* 2 * Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"). 5 * You may not use this file except in compliance with the License. 6 * A copy of the License is located at 7 * 8 * http://aws.amazon.com/apache2.0 9 * 10 * or in the "license" file accompanying this file. This file is distributed 11 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 12 * express or implied. See the License for the specific language governing 13 * permissions and limitations under the License. 14 */ 15 package software.amazon.eventstream; 16 17 import java.nio.ByteBuffer; 18 import java.util.zip.Checksum; 19 20 final class Checksums { Checksums()21 private Checksums() {} 22 update(Checksum checksum, ByteBuffer buffer)23 static void update(Checksum checksum, ByteBuffer buffer) { 24 if (buffer.hasArray()) { 25 int pos = buffer.position(); 26 int off = buffer.arrayOffset(); 27 int limit = buffer.limit(); 28 int rem = limit - pos; 29 checksum.update(buffer.array(), pos + off, rem); 30 buffer.position(limit); 31 } else { 32 int length = buffer.remaining(); 33 byte[] b = new byte[length]; 34 buffer.get(b, 0, length); 35 checksum.update(b, 0, length); 36 } 37 } 38 } 39