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| 1 | /* | ||
| 2 | * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.nio.cs; | ||
| 27 | |||
| 28 | import java.nio.*; | ||
| 29 | import java.nio.charset.*; | ||
| 30 | |||
| 31 | /** | ||
| 32 | * Base class for different flavors of UTF-16 encoders | ||
| 33 | */ | ||
| 34 | public abstract class UnicodeEncoder extends CharsetEncoder { | ||
| 35 | |||
| 36 | protected static final char BYTE_ORDER_MARK = '\uFEFF'; | ||
| 37 | protected static final char REVERSED_MARK = '\uFFFE'; | ||
| 38 | |||
| 39 | protected static final int BIG = 0; | ||
| 40 | protected static final int LITTLE = 1; | ||
| 41 | |||
| 42 | private int byteOrder; /* Byte order in use */ | ||
| 43 | private boolean usesMark; /* Write an initial BOM */ | ||
| 44 | private boolean needsMark; | ||
| 45 | |||
| 46 | protected UnicodeEncoder(Charset cs, int bo, boolean m) { | ||
| 47 | super(cs, 2.0f, | ||
| 48 | // Four bytes max if you need a BOM | ||
| 49 | m ? 4.0f : 2.0f, | ||
| 50 | // Replacement depends upon byte order | ||
| 51 | ((bo == BIG) | ||
| 52 | ? new byte[] { (byte)0xff, (byte)0xfd } | ||
| 53 | : new byte[] { (byte)0xfd, (byte)0xff })); | ||
| 54 | usesMark = needsMark = m; | ||
| 55 | byteOrder = bo; | ||
| 56 | } | ||
| 57 | |||
| 58 | private void put(char c, ByteBuffer dst) { | ||
| 59 | if (byteOrder == BIG) { | ||
| 60 | dst.put((byte)(c >> 8)); | ||
| 61 | dst.put((byte)(c & 0xff)); | ||
| 62 | } else { | ||
| 63 | dst.put((byte)(c & 0xff)); | ||
| 64 | dst.put((byte)(c >> 8)); | ||
| 65 | } | ||
| 66 | } | ||
| 67 | |||
| 68 | private final Surrogate.Parser sgp = new Surrogate.Parser(); | ||
| 69 | |||
| 70 | protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) { | ||
| 71 | int mark = src.position(); | ||
| 72 | |||
| 73 | if (needsMark && src.hasRemaining()) { | ||
| 74 | if (dst.remaining() < 2) | ||
| 75 | return CoderResult.OVERFLOW; | ||
| 76 | put(BYTE_ORDER_MARK, dst); | ||
| 77 | needsMark = false; | ||
| 78 | } | ||
| 79 | try { | ||
| 80 | while (src.hasRemaining()) { | ||
| 81 | char c = src.get(); | ||
| 82 | if (!Character.isSurrogate(c)) { | ||
| 83 | if (dst.remaining() < 2) | ||
| 84 | return CoderResult.OVERFLOW; | ||
| 85 | mark++; | ||
| 86 | put(c, dst); | ||
| 87 | continue; | ||
| 88 | } | ||
| 89 | int d = sgp.parse(c, src); | ||
| 90 | if (d < 0) | ||
| 91 | return sgp.error(); | ||
| 92 | if (dst.remaining() < 4) | ||
| 93 | return CoderResult.OVERFLOW; | ||
| 94 | mark += 2; | ||
| 95 | put(Character.highSurrogate(d), dst); | ||
| 96 | put(Character.lowSurrogate(d), dst); | ||
| 97 | } | ||
| 98 | return CoderResult.UNDERFLOW; | ||
| 99 | } finally { | ||
| 100 | src.position(mark); | ||
| 101 | } | ||
| 102 | } | ||
| 103 | |||
| 104 | protected void implReset() { | ||
| 105 | needsMark = usesMark; | ||
| 106 | } | ||
| 107 | |||
| 108 | public boolean canEncode(char c) { | ||
| 109 | return ! Character.isSurrogate(c); | ||
| 110 | } | ||
| 111 | } | ||