ohair@286: /*
mkos@384:  * Copyright (c) 2004, 2013, Oracle and/or its affiliates. All rights reserved.
ohair@286:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ohair@286:  *
ohair@286:  * This code is free software; you can redistribute it and/or modify it
ohair@286:  * under the terms of the GNU General Public License version 2 only, as
ohair@286:  * published by the Free Software Foundation.  Oracle designates this
ohair@286:  * particular file as subject to the "Classpath" exception as provided
ohair@286:  * by Oracle in the LICENSE file that accompanied this code.
ohair@286:  *
ohair@286:  * This code is distributed in the hope that it will be useful, but WITHOUT
ohair@286:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ohair@286:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ohair@286:  * version 2 for more details (a copy is included in the LICENSE file that
ohair@286:  * accompanied this code).
ohair@286:  *
ohair@286:  * You should have received a copy of the GNU General Public License version
ohair@286:  * 2 along with this work; if not, write to the Free Software Foundation,
ohair@286:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ohair@286:  *
ohair@286:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@286:  * or visit www.oracle.com if you need additional information or have any
ohair@286:  * questions.
ohair@286:  *
ohair@286:  * THIS FILE WAS MODIFIED BY SUN MICROSYSTEMS, INC.
ohair@286:  */
ohair@286: 
ohair@286: package com.sun.xml.internal.fastinfoset.algorithm;
ohair@286: 
ohair@286: 
ohair@286: import java.io.EOFException;
ohair@286: import java.io.IOException;
ohair@286: import java.io.InputStream;
ohair@286: import java.io.OutputStream;
ohair@286: import java.nio.CharBuffer;
ohair@286: import java.util.ArrayList;
ohair@286: import java.util.List;
ohair@286: 
ohair@286: import com.sun.xml.internal.org.jvnet.fastinfoset.EncodingAlgorithmException;
ohair@286: import com.sun.xml.internal.fastinfoset.CommonResourceBundle;
ohair@286: 
ohair@286: 
ohair@286: /**
ohair@286:  *
ohair@286:  * An encoder for handling boolean values.  Suppports the builtin BOOLEAN encoder.
ohair@286:  *
ohair@286:  * @author Alan Hudson
ohair@286:  * @author Paul Sandoz
ohair@286:  *
ohair@286:  */
ohair@286: public class BooleanEncodingAlgorithm extends BuiltInEncodingAlgorithm {
ohair@286: 
ohair@286:     /** Table for setting a particular bit of a byte */
ohair@286:     private static final int[] BIT_TABLE = {
ohair@286:         1 << 7,
ohair@286:         1 << 6,
ohair@286:         1 << 5,
ohair@286:         1 << 4,
ohair@286:         1 << 3,
ohair@286:         1 << 2,
ohair@286:         1 << 1,
ohair@286:         1 << 0};
ohair@286: 
ohair@286:     public int getPrimtiveLengthFromOctetLength(int octetLength) throws EncodingAlgorithmException {
ohair@286:         // Cannot determine the number of boolean values from just the octet length
ohair@286:         throw new UnsupportedOperationException();
ohair@286:     }
ohair@286: 
ohair@286:     public int getOctetLengthFromPrimitiveLength(int primitiveLength) {
ohair@286:         if (primitiveLength < 5) {
ohair@286:             return 1;
ohair@286:         } else {
ohair@286:             final int div = primitiveLength / 8;
ohair@286:             return (div == 0) ? 2 : 1 + div;
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     public final Object decodeFromBytes(byte[] b, int start, int length) throws EncodingAlgorithmException {
ohair@286:         final int blength = getPrimtiveLengthFromOctetLength(length, b[start]);
ohair@286:         boolean[] data = new boolean[blength];
ohair@286: 
ohair@286:         decodeFromBytesToBooleanArray(data, 0, blength, b, start, length);
ohair@286:         return data;
ohair@286:     }
ohair@286: 
ohair@286:     public final Object decodeFromInputStream(InputStream s) throws IOException {
ohair@286:         final List booleanList = new ArrayList();
ohair@286: 
ohair@286:         int value = s.read();
ohair@286:         if (value == -1) {
ohair@286:             throw new EOFException();
ohair@286:         }
ohair@286:         final int unusedBits = (value >> 4) & 0xFF;
ohair@286: 
ohair@286:         int bitPosition = 4;
ohair@286:         int bitPositionEnd = 8;
ohair@286:         int valueNext = 0;
ohair@286:         do {
ohair@286:             valueNext = s.read();
ohair@286:             if (valueNext == -1) {
ohair@286:                 bitPositionEnd -= unusedBits;
ohair@286:             }
ohair@286: 
ohair@286:             while(bitPosition < bitPositionEnd) {
ohair@286:                 booleanList.add(
ohair@286:                         Boolean.valueOf((value & BIT_TABLE[bitPosition++]) > 0));
ohair@286:             }
ohair@286: 
ohair@286:             value = valueNext;
ohair@286:         } while (value != -1);
ohair@286: 
ohair@286:         return generateArrayFromList(booleanList);
ohair@286:     }
ohair@286: 
ohair@286:     public void encodeToOutputStream(Object data, OutputStream s) throws IOException {
ohair@286:         if (!(data instanceof boolean[])) {
ohair@286:             throw new IllegalArgumentException(CommonResourceBundle.getInstance().getString("message.dataNotBoolean"));
ohair@286:         }
ohair@286: 
ohair@286:         boolean array[] = (boolean[])data;
ohair@286:         final int alength = array.length;
ohair@286: 
ohair@286:         final int mod = (alength + 4) % 8;
ohair@286:         final int unusedBits = (mod == 0) ? 0 : 8 - mod;
ohair@286: 
ohair@286:         int bitPosition = 4;
ohair@286:         int value = unusedBits << 4;
ohair@286:         int astart = 0;
ohair@286:         while (astart < alength) {
ohair@286:             if (array[astart++]) {
ohair@286:                 value |= BIT_TABLE[bitPosition];
ohair@286:             }
ohair@286: 
ohair@286:             if (++bitPosition == 8) {
ohair@286:                 s.write(value);
ohair@286:                 bitPosition = value = 0;
ohair@286:             }
ohair@286:         }
ohair@286: 
ohair@286:         if (bitPosition != 8) {
ohair@286:             s.write(value);
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     public final Object convertFromCharacters(char[] ch, int start, int length) {
ohair@286:         if (length == 0) {
ohair@286:             return new boolean[0];
ohair@286:         }
ohair@286: 
ohair@286:         final CharBuffer cb = CharBuffer.wrap(ch, start, length);
ohair@286:         final List booleanList = new ArrayList();
ohair@286: 
ohair@286:         matchWhiteSpaceDelimnatedWords(cb,
ohair@286:             new WordListener() {
ohair@286:                 public void word(int start, int end) {
ohair@286:                     if (cb.charAt(start) == 't') {
ohair@286:                         booleanList.add(Boolean.TRUE);
ohair@286:                     } else {
ohair@286:                         booleanList.add(Boolean.FALSE);
ohair@286:                     }
ohair@286:                 }
ohair@286:             }
ohair@286:         );
ohair@286: 
ohair@286:         return generateArrayFromList(booleanList);
ohair@286:     }
ohair@286: 
ohair@286:     public final void convertToCharacters(Object data, StringBuffer s) {
ohair@286:         if (data == null) {
ohair@286:             return;
ohair@286:         }
ohair@286: 
ohair@286:         final boolean[] value = (boolean[]) data;
ohair@286:         if (value.length == 0) {
ohair@286:             return;
ohair@286:         }
ohair@286: 
ohair@286:         // Insure conservately as all false
ohair@286:         s.ensureCapacity(value.length * 5);
ohair@286: 
ohair@286:         final int end = value.length - 1;
ohair@286:         for (int i = 0; i <= end; i++) {
ohair@286:             if (value[i]) {
ohair@286:                 s.append("true");
ohair@286:             } else {
ohair@286:                 s.append("false");
ohair@286:             }
ohair@286:             if (i != end) {
ohair@286:                 s.append(' ');
ohair@286:             }
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     public int getPrimtiveLengthFromOctetLength(int octetLength, int firstOctet) throws EncodingAlgorithmException {
ohair@286:         final int unusedBits = (firstOctet >> 4) & 0xFF;
ohair@286:         if (octetLength == 1) {
ohair@286:            if (unusedBits > 3) {
ohair@286:                throw new EncodingAlgorithmException(CommonResourceBundle.getInstance().getString("message.unusedBits4"));
ohair@286:            }
ohair@286:            return 4 - unusedBits;
ohair@286:         } else {
ohair@286:            if (unusedBits > 7) {
ohair@286:                throw new EncodingAlgorithmException(CommonResourceBundle.getInstance().getString("message.unusedBits8"));
ohair@286:            }
ohair@286:            return octetLength * 8 - 4 - unusedBits;
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     public final void decodeFromBytesToBooleanArray(boolean[] bdata, int bstart, int blength, byte[] b, int start, int length) {
ohair@286:         int value = b[start++] & 0xFF;
ohair@286:         int bitPosition = 4;
ohair@286:         final int bend = bstart + blength;
ohair@286:         while (bstart < bend) {
ohair@286:             if (bitPosition == 8) {
ohair@286:                 value = b[start++] & 0xFF;
ohair@286:                 bitPosition = 0;
ohair@286:             }
ohair@286: 
ohair@286:             bdata[bstart++] = (value & BIT_TABLE[bitPosition++]) > 0;
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286:     public void encodeToBytes(Object array, int astart, int alength, byte[] b, int start) {
ohair@286:         if (!(array instanceof boolean[])) {
ohair@286:             throw new IllegalArgumentException(CommonResourceBundle.getInstance().getString("message.dataNotBoolean"));
ohair@286:         }
ohair@286: 
ohair@286:         encodeToBytesFromBooleanArray((boolean[])array, astart, alength, b, start);
ohair@286:     }
ohair@286: 
ohair@286:     public void encodeToBytesFromBooleanArray(boolean[] array, int astart, int alength, byte[] b, int start) {
ohair@286:         final int mod = (alength + 4) % 8;
ohair@286:         final int unusedBits = (mod == 0) ? 0 : 8 - mod;
ohair@286: 
ohair@286:         int bitPosition = 4;
ohair@286:         int value = unusedBits << 4;
ohair@286:         final int aend = astart + alength;
ohair@286:         while (astart < aend) {
ohair@286:             if (array[astart++]) {
ohair@286:                 value |= BIT_TABLE[bitPosition];
ohair@286:             }
ohair@286: 
ohair@286:             if (++bitPosition == 8) {
ohair@286:                 b[start++] = (byte)value;
ohair@286:                 bitPosition = value = 0;
ohair@286:             }
ohair@286:         }
ohair@286: 
ohair@286:         if (bitPosition > 0) {
ohair@286:             b[start] = (byte)value;
ohair@286:         }
ohair@286:     }
ohair@286: 
ohair@286: 
ohair@286:     /**
ohair@286:      *
ohair@286:      * Generate a boolean array from a list of Booleans.
ohair@286:      *
ohair@286:      * @param array The array
ohair@286:      *
ohair@286:      */
mkos@384:     private boolean[] generateArrayFromList(List array) {
ohair@286:         boolean[] bdata = new boolean[array.size()];
ohair@286:         for (int i = 0; i < bdata.length; i++) {
ohair@286:             bdata[i] = ((Boolean)array.get(i)).booleanValue();
ohair@286:         }
ohair@286: 
ohair@286:         return bdata;
ohair@286:     }
ohair@286: 
ohair@286: }