FileDocCategorySizeDatePackage
UnZip.javaAPI DocExample3719Sun Mar 07 11:40:36 GMT 2004None

UnZip

public class UnZip extends Object
UnZip -- print or unzip a JAR or PKZIP file using java.util.zip. Command-line version: extracts files.
author
Ian Darwin, Ian@DarwinSys.com $Id: UnZip.java,v 1.7 2004/03/07 17:40:35 ian Exp $

Fields Summary
public static final int
LIST
Constants for mode listing or mode extracting.
public static final int
EXTRACT
protected int
mode
Whether we are extracting or just printing TOC
protected ZipFile
zippy
The ZipFile that is used to read an archive
protected byte[]
b
The buffer for reading/writing the ZipFile data
protected SortedSet
dirsMade
Cache of paths we've mkdir()ed.
protected boolean
warnedMkDir
Constructors Summary
UnZip()
Construct an UnZip object. Just allocate the buffer

		b = new byte[8092];
Methods Summary
protected voidgetFile(java.util.zip.ZipEntry e)
Process one file from the zip, given its name. Either print the name, or create the file on disk.


	                   	 
	      
		String zipName = e.getName();
		switch (mode) {
		case EXTRACT:
			if (zipName.startsWith("/")) {
				if (!warnedMkDir)
					System.out.println("Ignoring absolute paths");
				warnedMkDir = true;
				zipName = zipName.substring(1);
			}
			// if a directory, just return. We mkdir for every file,
			// since some widely-used Zip creators don't put out
			// any directory entries, or put them in the wrong place.
			if (zipName.endsWith("/")) {
				return;
			}
			// Else must be a file; open the file for output
			// Get the directory part.
			int ix = zipName.lastIndexOf('/");
			if (ix > 0) {
				String dirName = zipName.substring(0, ix);
				if (!dirsMade.contains(dirName)) {
					File d = new File(dirName);
					// If it already exists as a dir, don't do anything
					if (!(d.exists() && d.isDirectory())) {
						// Try to create the directory, warn if it fails
						System.out.println("Creating Directory: " + dirName);
						if (!d.mkdirs()) {
							System.err.println(
							"Warning: unable to mkdir " + dirName);
						}
						dirsMade.add(dirName);
					}
				}
			}
			System.err.println("Creating " + zipName);
			FileOutputStream os = new FileOutputStream(zipName);
			InputStream  is = zippy.getInputStream(e);
			int n = 0;
			while ((n = is.read(b)) >0)
				os.write(b, 0, n);
			is.close();
			os.close();
			break;
		case LIST:
			// Not extracting, just list
			if (e.isDirectory()) {
				System.out.println("Directory " + zipName);
			} else {
				System.out.println("File " + zipName);
			}
			break;
		default:
			throw new IllegalStateException("mode value (" + mode + ") bad");
		}
public static voidmain(java.lang.String[] argv)
Simple main program, construct an UnZipper, process each .ZIP file from argv[] through that object.


	               	 
	     
		UnZip u = new UnZip();

		for (int i=0; i<argv.length; i++) {
			if ("-x".equals(argv[i])) {
				u.setMode(EXTRACT);
				continue;
			}
			String candidate = argv[i];
			// System.err.println("Trying path " + candidate);
			if (candidate.endsWith(".zip") ||
				candidate.endsWith(".jar"))
					u.unZip(candidate);
			else System.err.println("Not a zip file? " + candidate);
		}
		System.err.println("All done!");
protected voidsetMode(int m)
Set the Mode (list, extract).

		if (m == LIST ||
		    m == EXTRACT)
			mode = m;
public voidunZip(java.lang.String fileName)
For a given Zip file, process each entry.

		dirsMade = new TreeSet();
		try {
			zippy = new ZipFile(fileName);
			Enumeration all = zippy.entries();
			while (all.hasMoreElements()) {
				getFile((ZipEntry)all.nextElement());
			}
		} catch (IOException err) {
			System.err.println("IO Error: " + err);
			return;
		}