//---------------------------------------------------------------------------
// Copyright © 2009-2009 Eamonn Duffy. All Rights Reserved.
//---------------------------------------------------------------------------
//
//  $RCSfile: $
//
// $Revision: $
//
// Created: Eamonn A. Duffy, 9-Nov-2009.
//
// Purpose: Simple UnZip helper.
//
// Credits: As of 9-Nov-2009, some incomplete UnZip code courtesy of: http://www.devx.com/getHelpOn/10MinuteSolution/20447
//          It did not handle Directories very well, at least not on a Zip file created by Windows Vista Explorer, so I
//          added and tested some more thorough Directory support.
//
//---------------------------------------------------------------------------

package simpleunzip;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.zip.*;

public class SimpleUnZip
{
    public static final void copyInputStream(InputStream in, OutputStream out) throws IOException
    {
        byte[] buffer = new byte[1024];
        int len;

        while ((len = in.read(buffer)) >= 0)
            out.write(buffer, 0, len);

        in.close();
        out.close();
    }

    public static void main(String[] args)
    {
        System.out.printf("Simple UnZip V1.0.1 : Eamonn Duffy, 9-Nov-2009.\n\n");

        if (args.length <= 0)
        {
            System.out.println("Please specify at least one File to UnZip.");
        }
        else
        {
            boolean bAddNewLine = false;

            for (String Arg : args)
            {
                if (bAddNewLine)
                    System.out.println();
                else
                    bAddNewLine = true;

                System.out.printf("Attempting to UnZip: %s\n", Arg);

                try
                {
                    ZipFile ZipFile = new ZipFile(Arg);

                    try
                    {
                        Enumeration Entries = ZipFile.entries();

                        while (Entries.hasMoreElements())
                        {
                            ZipEntry Entry = (ZipEntry)Entries.nextElement();

                            if (Entry.isDirectory())
                            {
                                File DirectoryPath = new File(Entry.getName());

                                if (! DirectoryPath.exists())
                                    DirectoryPath.mkdirs();
                            }
                            else
                            {
                                File File = new File(Entry.getName());

                                String FilePath = File.getPath();
                                String FileName = File.getName();

                                if (FilePath.length() > 0)
                                    FilePath = FilePath.substring(0, FilePath.length() - FileName.length());

                                if (FilePath.length() > 0)
                                {
                                    File DirectoryPath = new File(FilePath);

                                    if (! DirectoryPath.exists())
                                        DirectoryPath.mkdirs();
                                }

                                if (FileName.length() > 0)
                                {
                                    System.out.println("File: " + Entry.getName());

                                    copyInputStream(ZipFile.getInputStream(Entry),
                                        new BufferedOutputStream(new FileOutputStream(Entry.getName())));
                                }
                            }
                        }
                    }
                    catch (Exception Exception)
                    {
                        System.err.printf("Exception = %s\n", Exception.getMessage());
                    }

                    ZipFile.close();
                }
                catch (Exception Exception)
                {
                    System.err.printf("Zip File Exception = %s\n", Exception.getMessage());
                }
            }
        }
    }
}

//---------------------------------------------------------------------------
//                    End Of $RCSfile: $
//---------------------------------------------------------------------------