1/* 2 * Copyright (c) 2000, 2012, 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/* 27 */ 28 29 30import java.nio.ByteBuffer; 31import java.nio.CharBuffer; 32import java.nio.charset.Charset; 33import java.nio.charset.CharsetEncoder; 34import java.nio.charset.CoderResult; 35import java.nio.charset.CharacterCodingException; 36import java.nio.charset.MalformedInputException; 37import java.nio.charset.UnmappableCharacterException; 38import sun.nio.cs.Surrogate; 39 40 41public abstract class SingleByteEncoder 42 extends CharsetEncoder 43{ 44 45 private final short index1[]; 46 private final String index2; 47 private final int mask1; 48 private final int mask2; 49 private final int shift; 50 51 private final Surrogate.Parser sgp = new Surrogate.Parser(); 52 53 protected SingleByteEncoder(Charset cs, 54 short[] index1, String index2, 55 int mask1, int mask2, int shift) 56 { 57 super(cs, 1.0f, 1.0f); 58 this.index1 = index1; 59 this.index2 = index2; 60 this.mask1 = mask1; 61 this.mask2 = mask2; 62 this.shift = shift; 63 } 64 65 public boolean canEncode(char c) { 66 char testEncode = index2.charAt(index1[(c & mask1) >> shift] 67 + (c & mask2)); 68 return testEncode != '\u0000' || c == '\u0000'; 69 } 70 71 private CoderResult encodeArrayLoop(CharBuffer src, ByteBuffer dst) { 72 char[] sa = src.array(); 73 int sp = src.arrayOffset() + src.position(); 74 int sl = src.arrayOffset() + src.limit(); 75 assert (sp <= sl); 76 sp = (sp <= sl ? sp : sl); 77 byte[] da = dst.array(); 78 int dp = dst.arrayOffset() + dst.position(); 79 int dl = dst.arrayOffset() + dst.limit(); 80 assert (dp <= dl); 81 dp = (dp <= dl ? dp : dl); 82 83 try { 84 while (sp < sl) { 85 char c = sa[sp]; 86 if (Character.isSurrogate(c)) { 87 if (sgp.parse(c, sa, sp, sl) < 0) 88 return sgp.error(); 89 return sgp.unmappableResult(); 90 } 91 if (c >= '\uFFFE') 92 return CoderResult.unmappableForLength(1); 93 if (dl - dp < 1) 94 return CoderResult.OVERFLOW; 95 96 char e = index2.charAt(index1[(c & mask1) >> shift] 97 + (c & mask2)); 98 99 // If output byte is zero because input char is zero 100 // then character is mappable, o.w. fail 101 if (e == '\u0000' && c != '\u0000') 102 return CoderResult.unmappableForLength(1); 103 104 sp++; 105 da[dp++] = (byte)e; 106 } 107 return CoderResult.UNDERFLOW; 108 } finally { 109 src.position(sp - src.arrayOffset()); 110 dst.position(dp - dst.arrayOffset()); 111 } 112 } 113 114 private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) { 115 int mark = src.position(); 116 try { 117 while (src.hasRemaining()) { 118 char c = src.get(); 119 if (Character.isSurrogate(c)) { 120 if (sgp.parse(c, src) < 0) 121 return sgp.error(); 122 return sgp.unmappableResult(); 123 } 124 if (c >= '\uFFFE') 125 return CoderResult.unmappableForLength(1); 126 if (!dst.hasRemaining()) 127 return CoderResult.OVERFLOW; 128 129 char e = index2.charAt(index1[(c & mask1) >> shift] 130 + (c & mask2)); 131 132 // If output byte is zero because input char is zero 133 // then character is mappable, o.w. fail 134 if (e == '\u0000' && c != '\u0000') 135 return CoderResult.unmappableForLength(1); 136 137 mark++; 138 dst.put((byte)e); 139 } 140 return CoderResult.UNDERFLOW; 141 } finally { 142 src.position(mark); 143 } 144 } 145 146 protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) { 147 if (true && src.hasArray() && dst.hasArray()) 148 return encodeArrayLoop(src, dst); 149 else 150 return encodeBufferLoop(src, dst); 151 } 152 153 public byte encode(char inputChar) { 154 return (byte)index2.charAt(index1[(inputChar & mask1) >> shift] + 155 (inputChar & mask2)); 156 } 157} 158