84 lines
2.9 KiB
Java
84 lines
2.9 KiB
Java
/**
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*
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* Copyright © 2017 Paul Schaub
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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.jivesoftware.smackx.jingle_filetransfer;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.security.DigestInputStream;
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import org.jivesoftware.smackx.hashes.HashManager;
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import org.jivesoftware.smackx.hashes.element.HashElement;
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/**
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* FileReader that reads a file into a byte array while returning the hash of the file.
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*/
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public final class FileAndHashReader {
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/**
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* Read a file into a byte array and calculate the hash sum of the bytes that were read on the fly.
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* @param file file to read.
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* @param destination byte array where the file is read into.
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* @param algorithm algorithm used to calculate the hash.
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* @return hashElement containing the hash sum of the read bytes.
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* @throws IOException
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*/
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public static HashElement readAndCalculateHash(File file, final byte[] destination, HashManager.ALGORITHM algorithm) throws IOException {
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return readAndCalculateHash(file, destination, 0, algorithm);
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}
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/**
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* Read a file into a byte array and calculate the hash sum of the bytes that were read on the fly.
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* @param file file to read.
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* @param destination byte array where the file is read into.
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* @param offset offset from the beginning of the file.
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* @param algorithm algorithm used to calculate the hash.
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* @return hashElement containing the hash sum of the read bytes.
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* @throws IOException
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*/
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public static HashElement readAndCalculateHash(File file, final byte[] destination, int offset, HashManager.ALGORITHM algorithm) throws IOException {
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byte[] hash;
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int read;
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FileInputStream fin = null;
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DigestInputStream din = null;
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try {
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fin = new FileInputStream(file);
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try {
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din = new DigestInputStream(fin, HashManager.getMessageDigest(algorithm));
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read = din.read(destination, offset, destination.length);
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hash = din.getMessageDigest().digest();
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}
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finally {
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if (din != null) {
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din.close();
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}
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}
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}
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finally {
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if (fin != null) {
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fin.close();
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}
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}
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if (read == -1) {
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return null;
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}
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return HashManager.assembleHashElement(algorithm, hash);
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}
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}
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