de.dentrassi.pm.utils.deb.Packages.java Source code

Introduction

Here is the source code for de.dentrassi.pm.utils.deb.Packages.java

Source

/*******************************************************************************
 * Copyright (c) 2015 IBH SYSTEMS GmbH.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBH SYSTEMS GmbH - initial API and implementation
 *******************************************************************************/
package de.dentrassi.pm.utils.deb;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.List;
import java.util.Map;
import java.util.zip.GZIPInputStream;

import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.ar.ArArchiveInputStream;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;

import de.dentrassi.osgi.utils.Strings;
import de.dentrassi.pm.utils.deb.internal.BinarySectionPackagesFile;

public final class Packages {
    private Packages() {
    }

    public static Map<String, String> parseControlFile(final File packageFile) throws IOException, ParserException {
        try (final ArArchiveInputStream in = new ArArchiveInputStream(new FileInputStream(packageFile))) {
            ArchiveEntry ar;
            while ((ar = in.getNextEntry()) != null) {
                if (!ar.getName().equals("control.tar.gz")) {
                    continue;
                }
                try (final TarArchiveInputStream inputStream = new TarArchiveInputStream(new GZIPInputStream(in))) {
                    TarArchiveEntry te;
                    while ((te = inputStream.getNextTarEntry()) != null) {
                        String name = te.getName();
                        if (name.startsWith("./")) {
                            name = name.substring(2);
                        }
                        if (!name.equals("control")) {
                            continue;
                        }
                        return parseControlFile(inputStream);
                    }
                }
            }
        }
        return null;
    }

    public static Map<String, String> parseControlFile(final InputStream inputStream)
            throws IOException, ParserException {
        return ControlFileParser.parse(inputStream);
    }

    public static List<Map<String, String>> parseStatusFile(final InputStream inputStream)
            throws IOException, ParserException {
        return ControlFileParser.parseMulti(inputStream);
    }

    public static void writeBinaryPackageValues(final PrintWriter writer, final Map<String, String> values)
            throws IOException {
        new ControlFileWriter(writer, BinarySectionPackagesFile.FORMATTERS).writeEntries(values);
    }

    private static MessageDigest MD5;

    static {
        try {
            MD5 = MessageDigest.getInstance("MD5");
        } catch (final NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
    }

    public static String makeDescriptionMd5(final String string) {
        if (string == null) {
            return null;
        }

        final StringBuilder sb = new StringBuilder();
        try {
            FieldFormatter.MULTI.appendValue(string, sb);
            sb.append('\n');
        } catch (final IOException e) {
            // this will never ever happen
        }
        final String result = sb.toString();

        final byte[] data = MD5.digest(result.getBytes(StandardCharsets.UTF_8));
        return Strings.hex(data);
    }
}