org.apache.commons.compress.archivers.sevenz.CLI Maven / Gradle / Ivy

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Apache Commons Compress defines an API for working with compression and archive formats. These include bzip2, gzip, pack200, LZMA, XZ, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4, Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.
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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package org.apache.commons.compress.archivers.sevenz;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class CLI {


    private enum Mode {
        LIST("Analysing") {
            @Override
            public void takeAction(final SevenZFile archive, final SevenZArchiveEntry entry) {
                System.out.print(entry.getName());
                if (entry.isDirectory()) {
                    System.out.print(" dir");
                } else {
                    System.out.print(" " + entry.getCompressedSize()
                                     + "/" + entry.getSize());
                }
                if (entry.getHasLastModifiedDate()) {
                    System.out.print(" " + entry.getLastModifiedDate());
                } else {
                    System.out.print(" no last modified date");
                }
                if (!entry.isDirectory()) {
                    System.out.println(" " + getContentMethods(entry));
                } else {
                    System.out.println("");
                }
            }

            private String getContentMethods(final SevenZArchiveEntry entry) {
                final StringBuilder sb = new StringBuilder();
                boolean first = true;
                for (final SevenZMethodConfiguration m : entry.getContentMethods()) {
                    if (!first) {
                        sb.append(", ");
                    }
                    first = false;
                    sb.append(m.getMethod());
                    if (m.getOptions() != null) {
                        sb.append("(").append(m.getOptions()).append(")");
                    }
                }
                return sb.toString();
            }
        },
        EXTRACT("Extracting") {
            private final byte[] buf = new byte[8192];
            @Override
            public void takeAction(final SevenZFile archive, final SevenZArchiveEntry entry)
                throws IOException {
                final File outFile = new File(entry.getName());
                if (entry.isDirectory()) {
                    if (!outFile.isDirectory() && !outFile.mkdirs()) {
                        throw new IOException("Cannot create directory " + outFile);
                    }
                    System.out.println("created directory " + outFile);
                    return;
                }

                System.out.println("extracting to " + outFile);
                final File parent = outFile.getParentFile();
                if (parent != null && !parent.exists() && !parent.mkdirs()) {
                    throw new IOException("Cannot create " + parent);
                }
                try (final FileOutputStream fos = new FileOutputStream(outFile)) {
                    final long total = entry.getSize();
                    long off = 0;
                    while (off < total) {
                        final int toRead = (int) Math.min(total - off, buf.length);
                        final int bytesRead = archive.read(buf, 0, toRead);
                        if (bytesRead < 1) {
                            throw new IOException("reached end of entry "
                                                  + entry.getName()
                                                  + " after " + off
                                                  + " bytes, expected "
                                                  + total);
                        }
                        off += bytesRead;
                        fos.write(buf, 0, bytesRead);
                    }
                }
            }
        };

        private final String message;
        Mode(final String message) {
            this.message = message;
        }
        public String getMessage() {
            return message;
        }
        public abstract void takeAction(SevenZFile archive, SevenZArchiveEntry entry)
            throws IOException;
    }

    public static void main(final String[] args) throws Exception {
        if (args.length == 0) {
            usage();
            return;
        }
        final Mode mode = grabMode(args);
        System.out.println(mode.getMessage() + " " + args[0]);
        final File f = new File(args[0]);
        if (!f.isFile()) {
            System.err.println(f + " doesn't exist or is a directory");
        }
        try (final SevenZFile archive = new SevenZFile(f)) {
            SevenZArchiveEntry ae;
            while((ae=archive.getNextEntry()) != null) {
                mode.takeAction(archive, ae);
            }
        }
    }

    private static void usage() {
        System.out.println("Parameters: archive-name [list|extract]");
    }

    private static Mode grabMode(final String[] args) {
        if (args.length < 2) {
            return Mode.LIST;
        }
        return Enum.valueOf(Mode.class, args[1].toUpperCase());
    }

}