1 files changed, 178 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/security/prng/BasePRNG.java b/gcc-4.4.3/libjava/classpath/gnu/java/security/prng/BasePRNG.java
new file mode 100644
index 000000000..3b7c8cf07
--- /dev/null
+++ b/gcc-4.4.3/libjava/classpath/gnu/java/security/prng/BasePRNG.java
@@ -0,0 +1,178 @@
+/* BasePRNG.java -- 
+   Copyright (C) 2001, 2002, 2006 Free Software Foundation, Inc.
+
+This file is a 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 of the License, 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; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, 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.security.prng;
+
+import java.util.Map;
+
+/**
+ * An abstract class to facilitate implementing PRNG algorithms.
+ */
+public abstract class BasePRNG
+    implements IRandom
+{
+  /** The canonical name prefix of the PRNG algorithm. */
+  protected String name;
+
+  /** Indicate if this instance has already been initialised or not. */
+  protected boolean initialised;
+
+  /** A temporary buffer to serve random bytes. */
+  protected byte[] buffer;
+
+  /** The index into buffer of where the next byte will come from. */
+  protected int ndx;
+
+  /**
+   * Trivial constructor for use by concrete subclasses.
+   * 
+   * @param name the canonical name of this instance.
+   */
+  protected BasePRNG(String name)
+  {
+    super();
+
+    this.name = name;
+    initialised = false;
+    buffer = new byte[0];
+  }
+
+  public String name()
+  {
+    return name;
+  }
+
+  public void init(Map attributes)
+  {
+    this.setup(attributes);
+
+    ndx = 0;
+    initialised = true;
+  }
+
+  public byte nextByte() throws IllegalStateException, LimitReachedException
+  {
+    if (! initialised)
+      throw new IllegalStateException();
+
+    return nextByteInternal();
+  }
+
+  public void nextBytes(byte[] out) throws IllegalStateException,
+      LimitReachedException
+  {
+    nextBytes(out, 0, out.length);
+  }
+
+  public void nextBytes(byte[] out, int offset, int length)
+      throws IllegalStateException, LimitReachedException
+  {
+    if (! initialised)
+      throw new IllegalStateException("not initialized");
+
+    if (length == 0)
+      return;
+
+    if (offset < 0 || length < 0 || offset + length > out.length)
+      throw new ArrayIndexOutOfBoundsException("offset=" + offset + " length="
+                                               + length + " limit="
+                                               + out.length);
+    if (ndx >= buffer.length)
+      {
+        fillBlock();
+        ndx = 0;
+      }
+    int count = 0;
+    while (count < length)
+      {
+        int amount = Math.min(buffer.length - ndx, length - count);
+        System.arraycopy(buffer, ndx, out, offset + count, amount);
+        count += amount;
+        ndx += amount;
+        if (ndx >= buffer.length)
+          {
+            fillBlock();
+            ndx = 0;
+          }
+      }
+  }
+
+  public void addRandomByte(byte b)
+  {
+    throw new UnsupportedOperationException("random state is non-modifiable");
+  }
+
+  public void addRandomBytes(byte[] buffer)
+  {
+    addRandomBytes(buffer, 0, buffer.length);
+  }
+
+  public void addRandomBytes(byte[] buffer, int offset, int length)
+  {
+    throw new UnsupportedOperationException("random state is non-modifiable");
+  }
+
+  public boolean isInitialised()
+  {
+    return initialised;
+  }
+
+  private byte nextByteInternal() throws LimitReachedException
+  {
+    if (ndx >= buffer.length)
+      {
+        this.fillBlock();
+        ndx = 0;
+      }
+
+    return buffer[ndx++];
+  }
+
+  public Object clone() throws CloneNotSupportedException
+  {
+    BasePRNG result = (BasePRNG) super.clone();
+    if (this.buffer != null)
+      result.buffer = (byte[]) this.buffer.clone();
+
+    return result;
+  }
+
+  public abstract void setup(Map attributes);
+
+  public abstract void fillBlock() throws LimitReachedException;
+}