1/* 2 * Copyright (c) 1996, 2005, 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 26package sun.font; 27 28import java.nio.CharBuffer; 29import java.nio.ByteBuffer; 30import java.nio.charset.*; 31import sun.nio.cs.*; 32import static sun.nio.cs.CharsetMapping.*; 33 34public class X11GB2312 extends Charset { 35 public X11GB2312 () { 36 super("X11GB2312", null); 37 } 38 public CharsetEncoder newEncoder() { 39 return new Encoder(this); 40 } 41 public CharsetDecoder newDecoder() { 42 return new Decoder(this); 43 } 44 45 public boolean contains(Charset cs) { 46 return cs instanceof X11GB2312; 47 } 48 49 private class Encoder extends CharsetEncoder { 50 private DoubleByte.Encoder enc = (DoubleByte.Encoder)new EUC_CN().newEncoder(); 51 52 public Encoder(Charset cs) { 53 super(cs, 2.0f, 2.0f); 54 } 55 56 public boolean canEncode(char c) { 57 if (c <= 0x7F) { 58 return false; 59 } 60 return enc.canEncode(c); 61 } 62 63 protected int encodeDouble(char c) { 64 return enc.encodeChar(c); 65 } 66 67 protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) { 68 char[] sa = src.array(); 69 int sp = src.arrayOffset() + src.position(); 70 int sl = src.arrayOffset() + src.limit(); 71 72 byte[] da = dst.array(); 73 int dp = dst.arrayOffset() + dst.position(); 74 int dl = dst.arrayOffset() + dst.limit(); 75 76 try { 77 while (sp < sl) { 78 char c = sa[sp]; 79 if (c <= '\u007f') 80 return CoderResult.unmappableForLength(1); 81 int ncode = encodeDouble(c); 82 if (ncode != 0 && c != '\u0000' ) { 83 da[dp++] = (byte) ((ncode >> 8) & 0x7f); 84 da[dp++] = (byte) (ncode & 0x7f); 85 sp++; 86 continue; 87 } 88 return CoderResult.unmappableForLength(1); 89 } 90 return CoderResult.UNDERFLOW; 91 } finally { 92 src.position(sp - src.arrayOffset()); 93 dst.position(dp - dst.arrayOffset()); 94 } 95 } 96 public boolean isLegalReplacement(byte[] repl) { 97 return true; 98 } 99 } 100 101 private class Decoder extends CharsetDecoder { 102 private DoubleByte.Decoder dec = (DoubleByte.Decoder)new EUC_CN().newDecoder(); 103 104 public Decoder(Charset cs) { 105 super(cs, 0.5f, 1.0f); 106 } 107 108 protected char decodeDouble(int b1, int b2) { 109 return dec.decodeDouble(b1, b2); 110 } 111 112 protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) { 113 byte[] sa = src.array(); 114 int sp = src.arrayOffset() + src.position(); 115 int sl = src.arrayOffset() + src.limit(); 116 assert (sp <= sl); 117 sp = (sp <= sl ? sp : sl); 118 char[] da = dst.array(); 119 int dp = dst.arrayOffset() + dst.position(); 120 int dl = dst.arrayOffset() + dst.limit(); 121 assert (dp <= dl); 122 dp = (dp <= dl ? dp : dl); 123 124 try { 125 while (sp < sl) { 126 if ( sl - sp < 2) { 127 return CoderResult.UNDERFLOW; 128 } 129 int b1 = sa[sp] & 0xFF | 0x80; 130 int b2 = sa[sp + 1] & 0xFF | 0x80; 131 char c = decodeDouble(b1, b2); 132 if (c == UNMAPPABLE_DECODING) { 133 return CoderResult.unmappableForLength(2); 134 } 135 if (dl - dp < 1) 136 return CoderResult.OVERFLOW; 137 da[dp++] = c; 138 sp +=2; 139 } 140 return CoderResult.UNDERFLOW; 141 } finally { 142 src.position(sp - src.arrayOffset()); 143 dst.position(dp - dst.arrayOffset()); 144 } 145 146 } 147 } 148 149} 150