OpenConcerto

Dépôt officiel du code source de l'ERP OpenConcerto
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svn://code.openconcerto.org/openconcerto

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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 *
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 * Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.
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 *
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 * The contents of this file are subject to the terms of the GNU General Public License Version 3
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 * only ("GPL"). You may not use this file except in compliance with the License. You can obtain a
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 * copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific
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 * language governing permissions and limitations under the License.
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 *
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 * When distributing the software, include this License Header Notice in each file.
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 */
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 package org.openconcerto.utils.sync;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.DataOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.security.MessageDigest;
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public class HashWriter {
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    public static final int BLOCK_SIZE = 1024;
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    private File in;
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    public HashWriter(File inputFile) {
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        this.in = inputFile;
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    }
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    public void saveHash(File outputFile) {
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        BufferedInputStream fb = null;
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        try {
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            if (!outputFile.exists()) {
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                new File(outputFile.getParent()).mkdirs();
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            }
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            final DataOutputStream bOut = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(outputFile)));
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            bOut.writeInt((int) this.in.length());
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            final MessageDigest hashSum = MessageDigest.getInstance("SHA-256");
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            final MessageDigest md5 = MessageDigest.getInstance("MD5");
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            fb = new BufferedInputStream(new FileInputStream(in));
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            final RollingChecksum32 r32 = new RollingChecksum32();
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            final byte[] buffer = new byte[BLOCK_SIZE];
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            int readSize = fb.read(buffer);
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            while (readSize > 0) {
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                // Update
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                r32.check(buffer, 0, readSize);
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                md5.reset();
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                md5.update(buffer, 0, readSize);
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                hashSum.update(buffer, 0, readSize);
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                // read
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                readSize = fb.read(buffer);
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                final byte[] engineDigest = md5.digest();
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                bOut.writeInt(r32.getValue());
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                bOut.write(engineDigest);
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            }
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            byte[] fileHash = new byte[hashSum.getDigestLength()];
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            fileHash = hashSum.digest();
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            bOut.write(fileHash);
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            bOut.close();
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        } catch (Exception e) {
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            e.printStackTrace();
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        } finally {
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            if (fb != null) {
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                try {
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                    fb.close();
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                } catch (IOException e) {
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                    e.printStackTrace();
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                }
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            }
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        }
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    }
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    public static byte[] getHash(File f) throws Exception {
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        final MessageDigest hashSum = MessageDigest.getInstance("SHA-256");
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        FileInputStream fIn = null;
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        try {
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            fIn = new FileInputStream(f);
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            BufferedInputStream fb = null;
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            try {
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                fb = new BufferedInputStream(fIn);
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                final byte[] buffer = new byte[BLOCK_SIZE];
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                int readSize = fb.read(buffer);
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                while (readSize > 0) {
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                    // Update
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                    hashSum.update(buffer, 0, readSize);
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                    // read
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                    readSize = fb.read(buffer);
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                }
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            } catch (Exception e) {
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                throw new IOException(e);
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            } finally {
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                if (fb != null) {
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                    fb.close();
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                }
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            }
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        } catch (Exception e) {
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            throw new IOException(e);
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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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        byte[] fileHash = new byte[hashSum.getDigestLength()];
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        fileHash = hashSum.digest();
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        return fileHash;
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    }
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    public static boolean compareHash(byte[] h1, byte[] h2) {
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        final int length = h1.length;
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        if (length != h2.length) {
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            return false;
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        }
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        for (int i = 0; i < length; i++) {
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            if (h1[i] != h2[i]) {
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                return false;
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            }
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        }
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        return true;
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    }
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}