+++ /dev/null
-/* DigestInputStream.java --- An Input stream tied to a message digest
- Copyright (C) 1999 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-package java.security;
-//import java.security.MessageDigest;
-import java.io.InputStream;
-import java.io.FilterInputStream;
-import java.io.IOException;
-
-/**
- DigestInputStream is a class that ties an InputStream with a
- MessageDigest. The Message Digest is used by the class to
- update it self as bytes are read from the InputStream.
-
- The updating to the digest depends on the on flag which is set
- to true by default to tell the class to update the data
- in the message digest.
-
- @version 0.0
- @author Mark Benvenuto <ivymccough@worldnet.att.net>
- */
-public class DigestInputStream extends FilterInputStream
-{
- /**
- The message digest for the DigestInputStream
- */
- protected MessageDigest digest;
-
- //Manages the on flag
- private boolean state = true;
-
- /**
- Constructs a new DigestInputStream.
- It associates a MessageDigest with the stream to
- compute the stream as data is written.
-
- @param stream An InputStream to associate this stream with
- @param digest A MessageDigest to hash the stream with
- */
- public DigestInputStream(InputStream stream, MessageDigest digest)
- {
- super(stream);
- //this.in = stream;
- this.digest = digest;
- }
-
- /**
- Returns the MessageDigest associated with this DigestInputStream
-
- @return The MessageDigest used to hash this stream
- */
- public MessageDigest getMessageDigest()
- {
- return digest;
- }
-
- /**
- Sets the current MessageDigest to current parameter
-
- @param digest A MessageDigest to associate with this stream
- */
- public void setMessageDigest(MessageDigest digest)
- {
- this.digest = digest;
- }
-
- /**
- Reads a byte from the input stream and updates the digest.
- This method reads the underlying input stream and if the
- on flag is true then updates the message digest.
-
- @return Returns a byte from the input stream, -1 is returned to indicate that
- the end of stream was reached before this read call
-
- @throws IOException if an IO error occurs in the underlying input stream,
- this error is thrown
- */
- public int read() throws IOException
- {
- int temp = in.read();
-
- if (state == true && temp != -1)
- digest.update((byte) temp);
-
- return temp;
- }
-
- /**
- Reads bytes from the input stream and updates the digest.
- This method reads the underlying input stream and if the
- on flag is true then updates the message digest.
-
- @param b a byte array to store the data from the input stream
- @param off an offset to start at in the array
- @param len length of data to read
- @return Returns count of bytes read, -1 is returned to indicate that
- the end of stream was reached before this read call
-
- @throws IOException if an IO error occurs in the underlying input stream,
- this error is thrown
- */
- public int read(byte[]b, int off, int len) throws IOException
- {
- int temp = in.read(b, off, len);
-
- if (state == true && temp != -1)
- digest.update(b, off, len);
-
- return temp;
- }
-
- /**
- Sets the flag specifing if this DigestInputStream updates the
- digest in the write() methods. The default is on;
-
- @param on True means it digests stream, false means it does not
- */
- public void on(boolean on)
- {
- state = on;
- }
-
- /**
- Converts the input stream and underlying message digest to a string.
-
- @return A string representing the input stream and message digest.
- */
- public String toString()
- {
- return "[Digest Input Stream] " + digest.toString();
- }
-}
projects / msp430-gcc.git / blobdiff