Initial revision

From-SVN: r102074

libjava/classpath/gnu/java/net/BASE64.java

@@ -0,0 +1,190 @@
+/* BASE.java --
+   Copyright (C) 2003, 2004, 2005  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., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 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 gnu.java.net;
+
+/**
+ * Encodes and decodes text according to the BASE64 encoding.
+ *
+ * @author Chris Burdess (dog@gnu.org)
+ */
+public final class BASE64
+{
+  private static final byte[] src = {
+    0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
+    0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54,
+    0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x61, 0x62, 0x63, 0x64,
+    0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
+    0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
+    0x79, 0x7a, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+    0x38, 0x39, 0x2b, 0x2f
+  };
+
+  private static final byte[] dst;
+  static
+  {
+    dst = new byte[0x100];
+    for (int i = 0x0; i < 0xff; i++)
+      {
+        dst[i] = -1;
+      }
+    for (int i = 0; i < src.length; i++)
+      {
+        dst[src[i]] = (byte) i;
+      }
+  }
+
+  private BASE64()
+  {
+  }
+
+  /**
+   * Encode the specified byte array using the BASE64 algorithm.
+   *
+   * @param bs the source byte array
+   */
+  public static byte[] encode(byte[] bs)
+  {
+    int si = 0, ti = 0;         // source/target array indices
+    byte[] bt = new byte[((bs.length + 2) * 4) / 3];     // target byte array
+    for (; si < bs.length; si += 3)
+      {
+        int buflen = bs.length - si;
+        if (buflen == 1)
+          {
+            byte b = bs[si];
+            int i = 0;
+            bt[ti++] = src[b >>> 2 & 0x3f];
+            bt[ti++] = src[(b << 4 & 0x30) + (i >>> 4 & 0xf)];
+          }
+        else if (buflen == 2)
+          {
+            byte b1 = bs[si], b2 = bs[si + 1];
+            int i = 0;
+            bt[ti++] = src[b1 >>> 2 & 0x3f];
+            bt[ti++] = src[(b1 << 4 & 0x30) + (b2 >>> 4 & 0xf)];
+            bt[ti++] = src[(b2 << 2 & 0x3c) + (i >>> 6 & 0x3)];
+          }
+        else
+          {
+            byte b1 = bs[si], b2 = bs[si + 1], b3 = bs[si + 2];
+            bt[ti++] = src[b1 >>> 2 & 0x3f];
+            bt[ti++] = src[(b1 << 4 & 0x30) + (b2 >>> 4 & 0xf)];
+            bt[ti++] = src[(b2 << 2 & 0x3c) + (b3 >>> 6 & 0x3)];
+            bt[ti++] = src[b3 & 0x3f];
+          }
+      }
+     if (ti < bt.length)
+      {
+	byte[] tmp = new byte[ti];
+	System.arraycopy(bt, 0, tmp, 0, ti);
+	bt = tmp;
+      }
+    /*while (ti < bt.length)
+      {
+        bt[ti++] = 0x3d;
+      }*/
+    return bt;
+  }
+
+  /**
+   * Decode the specified byte array using the BASE64 algorithm.
+   *
+   * @param bs the source byte array
+   */
+  public static byte[] decode(byte[] bs)
+  {
+    int srclen = bs.length;
+    while (srclen > 0 && bs[srclen - 1] == 0x3d)
+      {
+        srclen--; /* strip padding character */
+      }
+    byte[] buffer = new byte[srclen];
+    int buflen = 0;
+    int si = 0;
+    int len = srclen - si;
+    while (len > 0)
+      {
+        byte b0 = dst[bs[si++] & 0xff];
+        byte b2 = dst[bs[si++] & 0xff];
+        buffer[buflen++] = (byte) (b0 << 2 & 0xfc | b2 >>> 4 & 0x3);
+        if (len > 2)
+          {
+            b0 = b2;
+            b2 = dst[bs[si++] & 0xff];
+            buffer[buflen++] = (byte) (b0 << 4 & 0xf0 | b2 >>> 2 & 0xf);
+            if (len > 3)
+              {
+                b0 = b2;
+                b2 = dst[bs[si++] & 0xff];
+                buffer[buflen++] = (byte) (b0 << 6 & 0xc0 | b2 & 0x3f);
+              }
+          }
+        len = srclen - si;
+      }
+    byte[] bt = new byte[buflen];
+    System.arraycopy(buffer, 0, bt, 0, buflen);
+    return bt;
+  }
+  
+  public static void main(String[] args)
+  {
+    boolean decode = false;
+    for (int i = 0; i < args.length; i++)
+      {
+        if (args[i].equals("-d"))
+          {
+            decode = true;
+          }
+        else
+          {
+            try
+              {
+                byte[] in = args[i].getBytes("US-ASCII");
+                byte[] out = decode ? decode(in) : encode(in);
+                System.out.println(args[i] + " = " +
+                                   new String(out, "US-ASCII"));
+              }
+            catch (java.io.UnsupportedEncodingException e)
+              {
+                e.printStackTrace(System.err);
+              }
+          }
+      }
+  }
+}