com.amaze.filemanager.filesystem.compressed.extractcontents.helpers.GzipExtractor.java Source code

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Here is the source code for com.amaze.filemanager.filesystem.compressed.extractcontents.helpers.GzipExtractor.java

Source

/*
 * GzipExtractor.java
 *
 * Copyright (C) 2018 Emmanuel Messulam<emmanuelbendavid@gmail.com>,
 * Raymond Lai <airwave209gt@gmail.com>.
 *
 * This file is part of Amaze File Manager.
 *
 * Amaze File Manager is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.amaze.filemanager.filesystem.compressed.extractcontents.helpers;

import android.content.Context;
import android.support.annotation.NonNull;

import com.amaze.filemanager.filesystem.FileUtil;
import com.amaze.filemanager.filesystem.compressed.CompressedHelper;
import com.amaze.filemanager.filesystem.compressed.extractcontents.Extractor;
import com.amaze.filemanager.utils.ServiceWatcherUtil;
import com.amaze.filemanager.utils.files.GenericCopyUtil;

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 java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;

public class GzipExtractor extends Extractor {

    public GzipExtractor(Context context, String filePath, String outputPath, OnUpdate listener) {
        super(context, filePath, outputPath, listener);
    }

    @Override
    protected void extractWithFilter(@NonNull Filter filter) throws IOException {
        long totalBytes = 0;
        ArrayList<TarArchiveEntry> archiveEntries = new ArrayList<>();
        TarArchiveInputStream inputStream = new TarArchiveInputStream(
                new GzipCompressorInputStream(new FileInputStream(filePath)));

        TarArchiveEntry tarArchiveEntry;

        while ((tarArchiveEntry = inputStream.getNextTarEntry()) != null) {
            if (CompressedHelper.isEntryPathValid(tarArchiveEntry.getName())) {
                if (filter.shouldExtract(tarArchiveEntry.getName(), tarArchiveEntry.isDirectory())) {
                    archiveEntries.add(tarArchiveEntry);
                    totalBytes += tarArchiveEntry.getSize();
                }
            } else {
                invalidArchiveEntries.add(tarArchiveEntry.getName());
            }
        }

        listener.onStart(totalBytes, archiveEntries.get(0).getName());

        inputStream.close();
        inputStream = new TarArchiveInputStream(new GzipCompressorInputStream(new FileInputStream(filePath)));

        for (TarArchiveEntry entry : archiveEntries) {
            if (!listener.isCancelled()) {
                listener.onUpdate(entry.getName());
                //TAR is sequential, you need to walk all the way to the file you want
                while (entry.hashCode() != inputStream.getNextTarEntry().hashCode())
                    ;
                extractEntry(context, inputStream, entry, outputPath);
            }
        }
        inputStream.close();

        listener.onFinish();
    }

    private void extractEntry(@NonNull final Context context, TarArchiveInputStream inputStream,
            TarArchiveEntry entry, String outputDir) throws IOException {

        File outputFile = new File(outputDir, fixEntryName(entry.getName()));
        if (!outputFile.getCanonicalPath().startsWith(outputDir)) {
            throw new IOException("Incorrect ZipEntry path!");
        }

        if (entry.isDirectory()) {
            FileUtil.mkdir(outputFile, context);
            return;
        }

        if (!outputFile.getParentFile().exists()) {
            FileUtil.mkdir(outputFile.getParentFile(), context);
        }

        BufferedOutputStream outputStream = new BufferedOutputStream(FileUtil.getOutputStream(outputFile, context));
        try {
            int len;
            byte buf[] = new byte[GenericCopyUtil.DEFAULT_BUFFER_SIZE];
            while ((len = inputStream.read(buf)) != -1) {
                if (!listener.isCancelled()) {
                    outputStream.write(buf, 0, len);
                    ServiceWatcherUtil.position += len;
                } else
                    break;
            }
        } finally {
            outputStream.close();
        }
    }

}