com.alutam.ziputils
Class ZipDecryptInputStream

java.lang.Object
  java.io.InputStream
      com.alutam.ziputils.ZipDecryptInputStream

All Implemented Interfaces:

Closeable

public class ZipDecryptInputStream
extends InputStream

Input stream converting a password-protected zip to an unprotected zip.

Example usage:

Reading a password-protected zip from file:

  ZipDecryptInputStream zdis = new ZipDecryptInputStream(new FileInputStream(fileName), password);
  ZipInputStream zis = new ZipInputStream(zdis);
  ... read the zip file from zis - the standard JDK ZipInputStream ...
 

Converting a password-protected zip file to an unprotected zip file:

  ZipDecryptInputStream src = new ZipDecryptInputStream(new FileInputStream(srcFile), password);
  FileOutputStream dest = new FileOutputStream(destFile);

  // should wrap with try-catch-finally, do the close in finally
  int b;
  while ((b = src.read()) > -1) {
      dest.write(b);
  }

  src.close();
  dest.close();
 

Author:

Martin Matula (martin at alutam.com)

Constructor Summary

ZipDecryptInputStream(InputStream stream, char[] password)
Safer constructor.

ZipDecryptInputStream(InputStream stream, String password)
Creates a new instance of the stream.

Method Summary

void	close()
int	read()

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, read, reset, skip

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ZipDecryptInputStream

public ZipDecryptInputStream(InputStream stream,
                             String password)

Creates a new instance of the stream.

Parameters:

stream - Input stream serving the password-protected zip file to be decrypted.

password - Password to be used to decrypt the password-protected zip file.

ZipDecryptInputStream

public ZipDecryptInputStream(InputStream stream,
                             char[] password)

Safer constructor. Takes password as a char array that can be nulled right after calling this constructor instead of a string that may be visible on the heap for the duration of application run time.

Parameters:

stream - Input stream serving the password-protected zip file.

password - Password to use for decrypting the zip file.

Method Detail

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException