| /******************************************************************************* |
| * Copyright (c) 2018, 2018 Mykola Nikishov. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Mykola Nikishov - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.equinox.internal.p2.artifact.processors.checksum; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.security.MessageDigest; |
| import org.eclipse.equinox.internal.p2.repository.helpers.ChecksumHelper; |
| import org.eclipse.equinox.internal.provisional.p2.artifact.repository.processing.ProcessingStep; |
| |
| /** |
| * @noreference This class is not intended to be referenced by clients. |
| */ |
| public abstract class MessageDigestProcessingStep extends ProcessingStep { |
| |
| protected MessageDigest messageDigest; |
| private static final int BUFFER_SIZE = 16 * 1024; |
| private ByteBuffer buffer = ByteBuffer.allocate(BUFFER_SIZE); |
| |
| @Override |
| final public void write(int b) throws IOException { |
| getDestination().write(b); |
| |
| boolean isBufferFull = buffer.remaining() == 0; |
| if (isBufferFull) { |
| processBufferredBytes(); |
| } |
| |
| buffer.put((byte) b); |
| } |
| |
| private void processBufferredBytes() { |
| buffer.flip(); |
| updateDigest(); |
| buffer.clear(); |
| } |
| |
| private void updateDigest() { |
| messageDigest.update(buffer); |
| } |
| |
| @Override |
| final public void close() throws IOException { |
| processBufferredBytes(); |
| String digestString = digest(); |
| onClose(digestString); |
| super.close(); |
| } |
| |
| private String digest() { |
| byte[] digestBytes = messageDigest.digest(); |
| return ChecksumHelper.toHexString(digestBytes); |
| } |
| |
| protected abstract void onClose(String digestString); |
| |
| } |