1 files changed, 153 insertions, 0 deletions
diff --git a/libjava/gnu/java/nio/charset/UTF_16Encoder.java b/libjava/gnu/java/nio/charset/UTF_16Encoder.java
new file mode 100644
index 00000000000..b0cb9ed8ce1
--- /dev/null
+++ b/libjava/gnu/java/nio/charset/UTF_16Encoder.java
@@ -0,0 +1,153 @@
+/* UTF_16Encoder.java -- 
+   Copyright (C) 2002 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 gnu.java.nio.charset;
+
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetEncoder;
+import java.nio.charset.CoderResult;
+
+/**
+ * Encoder for UTF-16, UTF-15LE, and UTF-16BE.
+ *
+ * @author Jesse Rosenstock
+ */
+final class UTF_16Encoder extends CharsetEncoder
+{
+  // byte orders
+  static final int BIG_ENDIAN = 0;
+  static final int LITTLE_ENDIAN = 1;
+
+  private static final char BYTE_ORDER_MARK = '\uFEFF';
+
+  private final int byteOrder;
+  private final boolean useByteOrderMark;
+  private boolean needsByteOrderMark;
+
+  UTF_16Encoder (Charset cs, int byteOrder, boolean useByteOrderMark)
+  {
+    super (cs, 2.0f,
+           useByteOrderMark ? 4.0f : 2.0f,
+           byteOrder == BIG_ENDIAN
+             ? new byte[] { (byte) 0xFF, (byte) 0xFD }
+             : new byte[] { (byte) 0xFD, (byte) 0xFF });
+    this.byteOrder = byteOrder;
+    this.useByteOrderMark = useByteOrderMark;
+    this.needsByteOrderMark = useByteOrderMark;
+  }
+
+  protected CoderResult encodeLoop (CharBuffer in, ByteBuffer out)
+  {
+    // TODO: Optimize this in the case in.hasArray() / out.hasArray()
+
+    if (needsByteOrderMark)
+      {
+        if (out.remaining () < 2)
+          return CoderResult.OVERFLOW;
+        put (out, BYTE_ORDER_MARK);
+        needsByteOrderMark = false;
+      }
+
+    int inPos = in.position ();
+    try
+      {
+        while (in.hasRemaining ())
+          {
+            char c = in.get ();
+
+            if (0xD800 <= c && c <= 0xDFFF)
+              {
+                // c is a surrogate
+
+                // make sure c is a high surrogate
+                if (c > 0xDBFF)
+                  return CoderResult.malformedForLength (1);
+                if (in.remaining () < 1)
+                  return CoderResult.UNDERFLOW;
+                char d = in.get ();
+                // make sure d is a low surrogate
+                if (d < 0xDC00 || d > 0xDFFF)
+                  return CoderResult.malformedForLength (1);
+                put (out, c);
+                put (out, d);
+                inPos += 2;
+              }
+            else
+              {
+                if (out.remaining () < 2)
+                  return CoderResult.OVERFLOW;
+                put (out, c);
+                inPos++;
+              }
+          }
+
+        return CoderResult.UNDERFLOW;
+      }
+    finally
+      {
+        in.position (inPos);
+      }
+  }
+
+  /**
+   * Writes <code>c</code> to <code>out</code> in the byte order
+   * specified by <code>byteOrder</code>.
+   **/
+  private void put (ByteBuffer out, char c)
+  {
+    if (byteOrder == BIG_ENDIAN)
+      {
+        out.put ((byte) (c >> 8));
+        out.put ((byte) (c & 0xFF));
+      }
+    else
+      {
+        out.put ((byte) (c & 0xFF));
+        out.put ((byte) (c >> 8));
+      }
+  }
+
+  protected void implReset ()
+  {
+    needsByteOrderMark = useByteOrderMark;
+  }
+
+  // TODO: override canEncode(char) and canEncode(CharSequence)
+  // for performance
+}