/*
  A file/directory Zipping/Unzipping utility
  @author: Mukul Gandhi

  Change log:

  Date				Description
  ----				-----------
  17.02.2007		Created. Implemented zipping functionality.

  22.03.2009		1) Cleaned up code
                    2) Added unzip support
                    3) The contents of zip file are now more like WinZip or WinRAR

  23.03.2009        Allow user to select compression strength

*/

import java.util.zip.ZipOutputStream;
import java.util.zip.ZipInputStream;
import java.util.zip.Deflater;
import java.util.zip.ZipEntry;
import java.util.StringTokenizer;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.io.File;


public class ZipUtil {

  private static ZipOutputStream zos = null;
  private static ZipInputStream zis = null;

  /*
    Main method of the class
  */
  public static void main(String[] args) {
	 if (args.length == 3) {
	   if (!args[1].equals("-o")) {
		 System.out.println("Error ...\n");
         System.out.println("Usage (for unzipping): java ZipUtil <inputfile.zip> -o <outdir>\n");
	     System.exit(0);
	   }
	   else {
         // do unzip
		 doUnzip(args[0], args[2]);
	   }
	 }
	 else if (args.length == 4) {
       if (args[2].equals("-s") && (args[3].equals("d") || args[3].equals("b"))) {
         // do zipping operation
	     doZip(args[0], args[1], args[3]);
	   }
	   else {
         System.out.println("Error ...\n");
		 System.out.println("Usage (for zipping): java ZipUtil [filename | dirname] <outputfile.zip> -s [d | b]\n");
		 System.out.println("-s : to specify compression strength");
         System.out.println("d - default compression, b - best compression");
		 System.exit(0);
	   }
	 }
	 else {
       // wrong command-line
       System.out.println("Error ...\n");
	   System.out.println("Usage (for zipping): java ZipUtil [filename | dirname] <outputfile.zip> -s [d | b]\n");
	   System.out.println("-s : to specify compression strength");
       System.out.println("d - default compression, b - best compression\n");
	   System.out.println("OR\n");
	   System.out.println("Usage (for unzipping): java ZipUtil <inputfile.zip> -o <outdir>\n");
	   System.exit(0);
	 }
  } // end of method, 'main'


  /*
     Method to zip/compress a list of files
  */
  private static void doZip(String file, String outFile, String strength) {
	 try {
		File input = new File(file);
	    zos = new ZipOutputStream(new FileOutputStream(outFile));

		if (strength.equals("d")) {
          zos.setLevel(Deflater.DEFAULT_COMPRESSION);
		}
		else if (strength.equals("b")) {
          zos.setLevel(Deflater.BEST_COMPRESSION);
		}

        if (input.isFile()) {
          // if input is a single file
          System.out.println("adding: "+input.getCanonicalPath());
	      String canPath = input.getCanonicalPath();
	      String entryName = canPath.substring(canPath.lastIndexOf('\\') + 1);
	      zos.putNextEntry(new ZipEntry(entryName));

	      FileInputStream fis = new FileInputStream(input);
	      byte[] buf = new byte[1024 * 100];  // 100 KB buffer
          int bytesRead;

   	      while ((bytesRead = fis.read(buf)) != -1) {
		    zos.write(buf, 0, bytesRead);
	      }

 	      fis.close();
	      zos.closeEntry();
        }
        else {
	      // if input is a directory
          File[] dirList = input.listFiles();
          zipDir(input.getCanonicalPath(), dirList);
        }

		zos.close();
	 }
	 catch (Exception ex) {
	   ex.printStackTrace();
	 }
  }  // end of method, 'doZip'


  /*
     Method to compress a list of files (a directory). called by method, doZip.
  */
  private static void zipDir(String dirPath, File[] dirList) {
	try {
      String dirPrefix = dirPath.substring(dirPath.lastIndexOf("\\") + 1);

      for (int i = 0; i < dirList.length; i++) {
        if (dirList[i].isFile()) {
		  System.out.println("adding: "+dirList[i].getCanonicalPath());
		  String canPath = dirList[i].getCanonicalPath();
		  String entryName = dirPrefix + canPath.substring(dirPath.length());
          zos.putNextEntry(new ZipEntry(entryName));

          FileInputStream fis = new FileInputStream(dirList[i]);
          byte[] buf = new byte[1024 * 100];  // 100 KB buffer
          int bytesRead;

   	      while ((bytesRead = fis.read(buf)) != -1) {
		    zos.write(buf, 0, bytesRead);
	      }

	      fis.close();
	      zos.closeEntry();
	    }
	    else {
		  // process subdirectory
          zipDir(dirPath, dirList[i].listFiles());
	    }
      }
	}
	catch (Exception ex) {
       ex.printStackTrace();
	}
  } // end of method, 'zipDir'


  /*
     Method to unzip/decompress a zip archive
  */
  private static void doUnzip(String inputFile, String outDir) {
    try {
	  zis = new ZipInputStream(new FileInputStream(inputFile));
	  ZipEntry zipentry = null;
	  while ((zipentry = zis.getNextEntry()) != null) {
        String entryName = zipentry.getName();
		String filePath = outDir + "\\" + entryName;

		createMissingDirs(filePath.substring(0, filePath.lastIndexOf("\\")));
        System.out.println("extracting to: "+filePath);
		FileOutputStream fos = new FileOutputStream(filePath);
		byte[] buf = new byte[1024 * 100];  // 100 KB buffer
        int bytesRead;

		while ((bytesRead = zis.read(buf, 0, buf.length)) != -1) {
		  fos.write(buf, 0, bytesRead);
		  fos.flush();
		}

		fos.close();
		zis.closeEntry();
	  }
    }
    catch (Exception ex) {
	  ex.printStackTrace();
    }
  } // end of method, 'doUnzip'


  /*
    Helper function to create missing directories. called by method, doUnzip.
  */
  private static void createMissingDirs(String dirPath) {
	String tempPath = "";
    StringTokenizer tokenizer = new StringTokenizer(dirPath, "\\");
	while (tokenizer.hasMoreTokens()) {
      String token = tokenizer.nextToken();
	  if (tempPath.equals("")) {
		tempPath = token;
	  }
	  else {
        tempPath = tempPath + "\\" + token;
      }
	  File tempFile = new File(tempPath);
	  if (!tempFile.exists()) {
        tempFile.mkdir();
	  }
	}
  }  // end of method, 'createMissingDirs'

} // end of class<!--'"</title></head>-->

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