gomp-20050608-branch/libjava/gnu/gcj/io/SimpleSHSStream.java

   1 // SimpleSHSStream.java
   2
   3 /* Copyright (C) 2000  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 package gnu.gcj.io;
  12 import java.io.Serializable;
  13 import java.io.*;
  14 import java.lang.reflect.*;
  15
  16 public class SimpleSHSStream extends java.io.DataOutputStream
  17 {
  18   int counter;
  19
  20   final int SHS_BLOCKSIZE = 64;
  21   final int SHS_DIGESTSIZE = 20;
  22
  23   byte buf[];
  24   byte shs_info[];
  25
  26   native static byte [] shsFinal (byte info[]);
  27   native static void shsUpdate (byte info[], byte buf[], int count);
  28   native static byte [] shsInit ();
  29
  30   private void update (byte b)
  31   {
  32     buf [counter++] = b;
  33     if (counter % SHS_BLOCKSIZE == 0)
  34       {
  35         counter = 0;
  36         shsUpdate (shs_info, buf, SHS_BLOCKSIZE);
  37       }
  38   }
  39
  40   public void write (int b) throws IOException
  41   {
  42     update ((byte)b);
  43     super.write (b);
  44   }
  45
  46   public void write (byte[] b, int off, int len) throws IOException
  47   {
  48     for (int i = 0; i < len; i++)
  49       write (b[i+off]);
  50   }
  51
  52   public byte[] digest()
  53   {
  54     shsUpdate (shs_info, buf, counter);
  55     return shsFinal (shs_info);
  56   }
  57
  58   public SimpleSHSStream (OutputStream out)
  59   {
  60     super (out);
  61     buf = new byte[SHS_BLOCKSIZE];
  62     shs_info = shsInit ();
  63     counter = 0;
  64   }
  65 }
  66