org.nd4j.util.ArchiveUtils.java Source code

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Here is the source code for org.nd4j.util.ArchiveUtils.java

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/*-
 *
 *  * Copyright 2018 Skymind,Inc.
 *  *
 *  *    Licensed 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.nd4j.util;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.zip.GZIPInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

/**
 * @author Adam Gibson
 */
@Slf4j
public class ArchiveUtils {

    protected ArchiveUtils() {
    }

    /**
     * Extracts files to the specified destination
     *
     * @param file the file to extract to
     * @param dest the destination directory
     * @throws IOException
     */
    public static void unzipFileTo(String file, String dest) throws IOException {
        File target = new File(file);
        if (!target.exists())
            throw new IllegalArgumentException("Archive doesnt exist");
        FileInputStream fin = new FileInputStream(target);
        int BUFFER = 2048;
        byte data[] = new byte[BUFFER];

        if (file.endsWith(".zip") || file.endsWith(".jar")) {
            try (ZipInputStream zis = new ZipInputStream(fin)) {
                //get the zipped file list entry
                ZipEntry ze = zis.getNextEntry();

                while (ze != null) {
                    String fileName = ze.getName();
                    File newFile = new File(dest + File.separator + fileName);

                    if (ze.isDirectory()) {
                        newFile.mkdirs();
                        zis.closeEntry();
                        ze = zis.getNextEntry();
                        continue;
                    }

                    FileOutputStream fos = new FileOutputStream(newFile);

                    int len;
                    while ((len = zis.read(data)) > 0) {
                        fos.write(data, 0, len);
                    }

                    fos.close();
                    ze = zis.getNextEntry();
                    log.debug("File extracted: " + newFile.getAbsoluteFile());
                }

                zis.closeEntry();
            }
        } else if (file.endsWith(".tar.gz") || file.endsWith(".tgz")) {

            BufferedInputStream in = new BufferedInputStream(fin);
            GzipCompressorInputStream gzIn = new GzipCompressorInputStream(in);
            TarArchiveInputStream tarIn = new TarArchiveInputStream(gzIn);

            TarArchiveEntry entry;
            /* Read the tar entries using the getNextEntry method **/
            while ((entry = (TarArchiveEntry) tarIn.getNextEntry()) != null) {
                log.info("Extracting: " + entry.getName());
                /* If the entry is a directory, create the directory. */

                if (entry.isDirectory()) {
                    File f = new File(dest + File.separator + entry.getName());
                    f.mkdirs();
                }
                /*
                 * If the entry is a file,write the decompressed file to the disk
                 * and close destination stream.
                 */
                else {
                    int count;
                    try (FileOutputStream fos = new FileOutputStream(dest + File.separator + entry.getName());
                            BufferedOutputStream destStream = new BufferedOutputStream(fos, BUFFER);) {
                        while ((count = tarIn.read(data, 0, BUFFER)) != -1) {
                            destStream.write(data, 0, count);
                        }

                        destStream.flush();
                        IOUtils.closeQuietly(destStream);
                    }
                }
            }

            // Close the input stream
            tarIn.close();
        } else if (file.endsWith(".gz")) {
            File extracted = new File(target.getParent(), target.getName().replace(".gz", ""));
            if (extracted.exists())
                extracted.delete();
            extracted.createNewFile();
            try (GZIPInputStream is2 = new GZIPInputStream(fin);
                    OutputStream fos = FileUtils.openOutputStream(extracted)) {
                IOUtils.copyLarge(is2, fos);
                fos.flush();
            }
        } else {
            throw new IllegalStateException(
                    "Unable to infer file type (compression format) from source file name: " + file);
        }
        target.delete();
    }
}