1/* 2 * Copyright (c) 2004, 2013, 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 * THIS FILE WAS MODIFIED BY SUN MICROSYSTEMS, INC. 26 */ 27 28package com.sun.xml.internal.fastinfoset.algorithm; 29 30 31import java.io.EOFException; 32import java.io.IOException; 33import java.io.InputStream; 34import java.io.OutputStream; 35import java.nio.CharBuffer; 36import java.util.ArrayList; 37import java.util.List; 38 39import com.sun.xml.internal.org.jvnet.fastinfoset.EncodingAlgorithmException; 40import com.sun.xml.internal.fastinfoset.CommonResourceBundle; 41 42 43/** 44 * 45 * An encoder for handling boolean values. Suppports the builtin BOOLEAN encoder. 46 * 47 * @author Alan Hudson 48 * @author Paul Sandoz 49 * 50 */ 51public class BooleanEncodingAlgorithm extends BuiltInEncodingAlgorithm { 52 53 /** Table for setting a particular bit of a byte */ 54 private static final int[] BIT_TABLE = { 55 1 << 7, 56 1 << 6, 57 1 << 5, 58 1 << 4, 59 1 << 3, 60 1 << 2, 61 1 << 1, 62 1 << 0}; 63 64 public int getPrimtiveLengthFromOctetLength(int octetLength) throws EncodingAlgorithmException { 65 // Cannot determine the number of boolean values from just the octet length 66 throw new UnsupportedOperationException(); 67 } 68 69 public int getOctetLengthFromPrimitiveLength(int primitiveLength) { 70 if (primitiveLength < 5) { 71 return 1; 72 } else { 73 final int div = primitiveLength / 8; 74 return (div == 0) ? 2 : 1 + div; 75 } 76 } 77 78 public final Object decodeFromBytes(byte[] b, int start, int length) throws EncodingAlgorithmException { 79 final int blength = getPrimtiveLengthFromOctetLength(length, b[start]); 80 boolean[] data = new boolean[blength]; 81 82 decodeFromBytesToBooleanArray(data, 0, blength, b, start, length); 83 return data; 84 } 85 86 public final Object decodeFromInputStream(InputStream s) throws IOException { 87 final List booleanList = new ArrayList(); 88 89 int value = s.read(); 90 if (value == -1) { 91 throw new EOFException(); 92 } 93 final int unusedBits = (value >> 4) & 0xFF; 94 95 int bitPosition = 4; 96 int bitPositionEnd = 8; 97 int valueNext = 0; 98 do { 99 valueNext = s.read(); 100 if (valueNext == -1) { 101 bitPositionEnd -= unusedBits; 102 } 103 104 while(bitPosition < bitPositionEnd) { 105 booleanList.add( 106 Boolean.valueOf((value & BIT_TABLE[bitPosition++]) > 0)); 107 } 108 109 value = valueNext; 110 } while (value != -1); 111 112 return generateArrayFromList(booleanList); 113 } 114 115 public void encodeToOutputStream(Object data, OutputStream s) throws IOException { 116 if (!(data instanceof boolean[])) { 117 throw new IllegalArgumentException(CommonResourceBundle.getInstance().getString("message.dataNotBoolean")); 118 } 119 120 boolean array[] = (boolean[])data; 121 final int alength = array.length; 122 123 final int mod = (alength + 4) % 8; 124 final int unusedBits = (mod == 0) ? 0 : 8 - mod; 125 126 int bitPosition = 4; 127 int value = unusedBits << 4; 128 int astart = 0; 129 while (astart < alength) { 130 if (array[astart++]) { 131 value |= BIT_TABLE[bitPosition]; 132 } 133 134 if (++bitPosition == 8) { 135 s.write(value); 136 bitPosition = value = 0; 137 } 138 } 139 140 if (bitPosition != 8) { 141 s.write(value); 142 } 143 } 144 145 public final Object convertFromCharacters(char[] ch, int start, int length) { 146 if (length == 0) { 147 return new boolean[0]; 148 } 149 150 final CharBuffer cb = CharBuffer.wrap(ch, start, length); 151 final List booleanList = new ArrayList(); 152 153 matchWhiteSpaceDelimnatedWords(cb, 154 new WordListener() { 155 public void word(int start, int end) { 156 if (cb.charAt(start) == 't') { 157 booleanList.add(Boolean.TRUE); 158 } else { 159 booleanList.add(Boolean.FALSE); 160 } 161 } 162 } 163 ); 164 165 return generateArrayFromList(booleanList); 166 } 167 168 public final void convertToCharacters(Object data, StringBuffer s) { 169 if (data == null) { 170 return; 171 } 172 173 final boolean[] value = (boolean[]) data; 174 if (value.length == 0) { 175 return; 176 } 177 178 // Insure conservately as all false 179 s.ensureCapacity(value.length * 5); 180 181 final int end = value.length - 1; 182 for (int i = 0; i <= end; i++) { 183 if (value[i]) { 184 s.append("true"); 185 } else { 186 s.append("false"); 187 } 188 if (i != end) { 189 s.append(' '); 190 } 191 } 192 } 193 194 public int getPrimtiveLengthFromOctetLength(int octetLength, int firstOctet) throws EncodingAlgorithmException { 195 final int unusedBits = (firstOctet >> 4) & 0xFF; 196 if (octetLength == 1) { 197 if (unusedBits > 3) { 198 throw new EncodingAlgorithmException(CommonResourceBundle.getInstance().getString("message.unusedBits4")); 199 } 200 return 4 - unusedBits; 201 } else { 202 if (unusedBits > 7) { 203 throw new EncodingAlgorithmException(CommonResourceBundle.getInstance().getString("message.unusedBits8")); 204 } 205 return octetLength * 8 - 4 - unusedBits; 206 } 207 } 208 209 public final void decodeFromBytesToBooleanArray(boolean[] bdata, int bstart, int blength, byte[] b, int start, int length) { 210 int value = b[start++] & 0xFF; 211 int bitPosition = 4; 212 final int bend = bstart + blength; 213 while (bstart < bend) { 214 if (bitPosition == 8) { 215 value = b[start++] & 0xFF; 216 bitPosition = 0; 217 } 218 219 bdata[bstart++] = (value & BIT_TABLE[bitPosition++]) > 0; 220 } 221 } 222 223 public void encodeToBytes(Object array, int astart, int alength, byte[] b, int start) { 224 if (!(array instanceof boolean[])) { 225 throw new IllegalArgumentException(CommonResourceBundle.getInstance().getString("message.dataNotBoolean")); 226 } 227 228 encodeToBytesFromBooleanArray((boolean[])array, astart, alength, b, start); 229 } 230 231 public void encodeToBytesFromBooleanArray(boolean[] array, int astart, int alength, byte[] b, int start) { 232 final int mod = (alength + 4) % 8; 233 final int unusedBits = (mod == 0) ? 0 : 8 - mod; 234 235 int bitPosition = 4; 236 int value = unusedBits << 4; 237 final int aend = astart + alength; 238 while (astart < aend) { 239 if (array[astart++]) { 240 value |= BIT_TABLE[bitPosition]; 241 } 242 243 if (++bitPosition == 8) { 244 b[start++] = (byte)value; 245 bitPosition = value = 0; 246 } 247 } 248 249 if (bitPosition > 0) { 250 b[start] = (byte)value; 251 } 252 } 253 254 255 /** 256 * 257 * Generate a boolean array from a list of Booleans. 258 * 259 * @param array The array 260 * 261 */ 262 private boolean[] generateArrayFromList(List array) { 263 boolean[] bdata = new boolean[array.size()]; 264 for (int i = 0; i < bdata.length; i++) { 265 bdata[i] = ((Boolean)array.get(i)).booleanValue(); 266 } 267 268 return bdata; 269 } 270 271} 272