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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.
There is a newer version: 9.1.6
/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * 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 proguard.io;

import proguard.classfile.TypeConstants;

import java.io.*;
import java.util.zip.*;

/**
 * This {@link DataEntry} represents a ZIP entry.
 *
 * @author Eric Lafortune
 */
public class ZipFileDataEntry implements DataEntry
{
    private final DataEntry   parent;
    private final ZipEntry    zipEntry;
    private       ZipFile     zipFile;
    private       InputStream zipInputStream;
    private       InputStream bufferedInputStream;


    public ZipFileDataEntry(DataEntry parent,
                            ZipEntry  zipEntry,
                            ZipFile   zipFile)
    {
        this.parent   = parent;
        this.zipEntry = zipEntry;
        this.zipFile  = zipFile;
    }


    // Implementations for DataEntry.

    @Override
    public String getName()
    {
        // Get the right separators.
        String name = zipEntry.getName()
            .replace(File.separatorChar, TypeConstants.PACKAGE_SEPARATOR);

        // Chop the trailing directory slash, if any.
        int length = name.length();
        return length > 0 &&
               name.charAt(length-1) == TypeConstants.PACKAGE_SEPARATOR ?
                   name.substring(0, length -1) :
                   name;
    }


    @Override
    public String getOriginalName()
    {
        return getName();
    }


    @Override
    public long getSize()
    {
        // Try to get some estimate of the size.
        return Math.max(zipEntry.getSize(), zipEntry.getCompressedSize());
    }


    @Override
    public boolean isDirectory()
    {
        return zipEntry.isDirectory();
    }


    @Override
    public InputStream getInputStream() throws IOException
    {
        if (zipInputStream == null)
        {
            zipInputStream = zipFile.getInputStream(zipEntry);
        }

        if (bufferedInputStream == null)
        {
            bufferedInputStream = new BufferedInputStream(zipInputStream);
        }

        return bufferedInputStream;
    }


    @Override
    public void closeInputStream() throws IOException
    {
        zipInputStream.close();
        zipFile             = null;
        bufferedInputStream = null;
    }


    @Override
    public DataEntry getParent()
    {
        return parent;
    }


    // Implementations for Object.

    @Override
    public String toString()
    {
        return parent.toString() + ':' + getName();
    }
}