1 files changed, 147 insertions, 0 deletions
diff --git a/libjava/java/security/DigestOutputStream.java b/libjava/java/security/DigestOutputStream.java
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+/* DigestOutputStream.java --- An output 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.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
+
+
+package java.security;
+
+import java.io.OutputStream;
+import java.io.FilterOutputStream;
+import java.io.IOException;
+
+/**
+   DigestOutputStream is a class that ties an OutputStream with a
+   MessageDigest. The Message Digest is used by the class to update it
+   self as bytes are written to the OutputStream.
+
+   The updating to the digest depends on the on flag which is set to
+   true by default that tells the class to update the data in the
+   message digest.
+
+   @version 0.0
+   @author Mark Benvenuto <ivymccough@worldnet.att.net>
+*/
+public class DigestOutputStream extends FilterOutputStream
+{
+  /**
+     The message digest for the DigestOutputStream
+  */
+  protected MessageDigest digest;
+
+  //Manages the on flag
+  private boolean state = true;
+
+  /**
+     Constructs a new DigestOutputStream.  It associates a
+     MessageDigest with the stream to compute the stream as data is
+     written.
+
+     @param stream An OutputStream to associate this stream with
+     @param digest A MessageDigest to hash the stream with
+  */
+  public DigestOutputStream (OutputStream stream, MessageDigest digest)
+  {
+    super (stream);
+    this.digest = digest;
+  }
+
+  /**
+     Returns the MessageDigest associated with this DigestOutputStream
+
+     @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;
+  }
+
+
+  /**
+     Updates the hash if the on flag is true and then writes a byte to
+     the underlying output stream.
+
+     @param b A byte to write to the output stream
+     
+     @exception IOException if the underlying output stream 
+     cannot write the byte, this is thrown.
+  */
+  public void write (int b) throws IOException
+  {
+    if (state)
+      digest.update ((byte)b);
+    
+    super.write (b);
+  }
+
+  /**
+     Updates the hash if the on flag is true and then writes the bytes
+     to the underlying output stream.
+
+     @param b Bytes to write to the output stream
+     @param off Offset to start to start at in array
+     @param len Length of data to write
+
+     @exception IOException if the underlying output stream 
+     cannot write the bytes, this is thrown.
+  */
+  public void write (byte[] b, int off, int len) throws IOException
+  {
+    if (state)
+      digest.update (b, off, len);
+
+    super.write (b, off, len);
+  }
+
+  /**
+     Sets the flag specifying if this DigestOutputStream 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 output stream and underlying message digest to a string.
+
+     @return A string representing the output stream and message digest.
+  */
+  public String toString()
+  {
+    return "[Digest Output Stream] " + digest.toString();
+  }
+}