| /* |
| * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.nio.cs; |
| |
| import java.nio.*; |
| import java.nio.charset.*; |
| |
| /** |
| * Base class for different flavors of UTF-16 encoders |
| */ |
| public abstract class UnicodeEncoder extends CharsetEncoder { |
| |
| protected static final char BYTE_ORDER_MARK = '\uFEFF'; |
| protected static final char REVERSED_MARK = '\uFFFE'; |
| |
| protected static final int BIG = 0; |
| protected static final int LITTLE = 1; |
| |
| private int byteOrder; /* Byte order in use */ |
| private boolean usesMark; /* Write an initial BOM */ |
| private boolean needsMark; |
| |
| protected UnicodeEncoder(Charset cs, int bo, boolean m) { |
| super(cs, 2.0f, |
| // Four bytes max if you need a BOM |
| m ? 4.0f : 2.0f, |
| // Replacement depends upon byte order |
| ((bo == BIG) |
| ? new byte[] { (byte)0xff, (byte)0xfd } |
| : new byte[] { (byte)0xfd, (byte)0xff })); |
| usesMark = needsMark = m; |
| byteOrder = bo; |
| } |
| |
| private void put(char c, ByteBuffer dst) { |
| if (byteOrder == BIG) { |
| dst.put((byte)(c >> 8)); |
| dst.put((byte)(c & 0xff)); |
| } else { |
| dst.put((byte)(c & 0xff)); |
| dst.put((byte)(c >> 8)); |
| } |
| } |
| |
| private final Surrogate.Parser sgp = new Surrogate.Parser(); |
| |
| protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) { |
| int mark = src.position(); |
| |
| if (needsMark && src.hasRemaining()) { |
| if (dst.remaining() < 2) |
| return CoderResult.OVERFLOW; |
| put(BYTE_ORDER_MARK, dst); |
| needsMark = false; |
| } |
| try { |
| while (src.hasRemaining()) { |
| char c = src.get(); |
| if (!Character.isSurrogate(c)) { |
| if (dst.remaining() < 2) |
| return CoderResult.OVERFLOW; |
| mark++; |
| put(c, dst); |
| continue; |
| } |
| int d = sgp.parse(c, src); |
| if (d < 0) |
| return sgp.error(); |
| if (dst.remaining() < 4) |
| return CoderResult.OVERFLOW; |
| mark += 2; |
| put(Character.highSurrogate(d), dst); |
| put(Character.lowSurrogate(d), dst); |
| } |
| return CoderResult.UNDERFLOW; |
| } finally { |
| src.position(mark); |
| } |
| } |
| |
| protected void implReset() { |
| needsMark = usesMark; |
| } |
| |
| public boolean canEncode(char c) { |
| return ! Character.isSurrogate(c); |
| } |
| } |