/*
 * Copyright (c) 2001, 2005, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.nio.cs.ext;

import java.util.Collections;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.nio.charset.*;

final class CompoundTextSupport {

    private static final class ControlSequence {

        final int hash;
        final byte[] escSequence;
        final byte[] encoding;

        ControlSequence(byte[] escSequence) {
            this(escSequence, null);
        }
        ControlSequence(byte[] escSequence, byte[] encoding) {
            if (escSequence == null) {
                throw new NullPointerException();
            }

            this.escSequence = escSequence;
            this.encoding = encoding;

            int hash = 0;
            int length = escSequence.length;

            for (int i = 0; i < escSequence.length; i++) {
                hash += (((int)escSequence[i]) & 0xff) << (i % 4);
            }
            if (encoding != null) {
                for (int i = 0; i < encoding.length; i++) {
                    hash += (((int)encoding[i]) & 0xff) << (i % 4);
                }
                length += 2 /* M L */ + encoding.length + 1 /* 0x02 */;
            }

            this.hash = hash;

            if (MAX_CONTROL_SEQUENCE_LEN < length) {
                MAX_CONTROL_SEQUENCE_LEN = length;
            }
        }

        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (!(obj instanceof ControlSequence)) {
                return false;
            }
            ControlSequence rhs = (ControlSequence)obj;
            if (escSequence != rhs.escSequence) {
                if (escSequence.length != rhs.escSequence.length) {
                    return false;
                }
                for (int i = 0; i < escSequence.length; i++) {
                    if (escSequence[i] != rhs.escSequence[i]) {
                        return false;
                    }
                }
            }
            if (encoding != rhs.encoding) {
                if (encoding == null || rhs.encoding == null ||
                    encoding.length != rhs.encoding.length)
                {
                    return false;
                }
                for (int i = 0; i < encoding.length; i++) {
                    if (encoding[i] != rhs.encoding[i]) {
                        return false;
                    }
                }
            }
            return true;
        }

        public int hashCode() {
            return hash;
        }

        ControlSequence concatenate(ControlSequence rhs) {
            if (encoding != null) {
                throw new IllegalArgumentException
                    ("cannot concatenate to a non-standard charset escape " +
                     "sequence");
            }

            int len = escSequence.length + rhs.escSequence.length;
            byte[] newEscSequence = new byte[len];
            System.arraycopy(escSequence, 0, newEscSequence, 0,
                             escSequence.length);
            System.arraycopy(rhs.escSequence, 0, newEscSequence,
                             escSequence.length, rhs.escSequence.length);
            return new ControlSequence(newEscSequence, rhs.encoding);
        }
    }

    static int MAX_CONTROL_SEQUENCE_LEN;

    
Maps a GL or GR escape sequence to an encoding.
/** * Maps a GL or GR escape sequence to an encoding. */
private static final Map sequenceToEncodingMap;
Indicates whether a particular encoding wants the high bit turned on or off.
/** * Indicates whether a particular encoding wants the high bit turned on * or off. */
private static final Map highBitsMap;
Maps an encoding to an escape sequence. Rather than manage two converters in CharToByteCOMPOUND_TEXT, we output escape sequences which modify both GL and GR if necessary. This makes the output slightly less efficient, but our code much simpler.
/** * Maps an encoding to an escape sequence. Rather than manage two * converters in CharToByteCOMPOUND_TEXT, we output escape sequences which * modify both GL and GR if necessary. This makes the output slightly less * efficient, but our code much simpler. */
private static final Map encodingToSequenceMap;
The keys of 'encodingToSequenceMap', sorted in preferential order.
/** * The keys of 'encodingToSequenceMap', sorted in preferential order. */
private static final List encodings; static { HashMap tSequenceToEncodingMap = new HashMap(33, 1.0f); HashMap tHighBitsMap = new HashMap(31, 1.0f); HashMap tEncodingToSequenceMap = new HashMap(21, 1.0f); ArrayList tEncodings = new ArrayList(21); if (!(isEncodingSupported("US-ASCII") && isEncodingSupported("ISO-8859-1"))) { throw new ExceptionInInitializerError ("US-ASCII and ISO-8859-1 unsupported"); } ControlSequence leftAscii = // high bit off, leave off new ControlSequence(new byte[] { 0x1B, 0x28, 0x42 }); tSequenceToEncodingMap.put(leftAscii, "US-ASCII"); tHighBitsMap.put(leftAscii, Boolean.FALSE); { ControlSequence rightAscii = // high bit on, turn off new ControlSequence(new byte[] { 0x1B, 0x29, 0x42 }); tSequenceToEncodingMap.put(rightAscii, "US-ASCII"); tHighBitsMap.put(rightAscii, Boolean.FALSE); } { ControlSequence rightHalf = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x2D, 0x41 }); tSequenceToEncodingMap.put(rightHalf, "ISO-8859-1"); tHighBitsMap.put(rightHalf, Boolean.TRUE); ControlSequence fullSet = leftAscii.concatenate(rightHalf); tEncodingToSequenceMap.put("ISO-8859-1", fullSet); tEncodings.add("ISO-8859-1"); } if (isEncodingSupported("ISO-8859-2")) { ControlSequence rightHalf = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x2D, 0x42 }); tSequenceToEncodingMap.put(rightHalf, "ISO-8859-2"); tHighBitsMap.put(rightHalf, Boolean.TRUE); ControlSequence fullSet = leftAscii.concatenate(rightHalf); tEncodingToSequenceMap.put("ISO-8859-2", fullSet); tEncodings.add("ISO-8859-2"); } if (isEncodingSupported("ISO-8859-3")) { ControlSequence rightHalf = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x2D, 0x43 }); tSequenceToEncodingMap.put(rightHalf, "ISO-8859-3"); tHighBitsMap.put(rightHalf, Boolean.TRUE); ControlSequence fullSet = leftAscii.concatenate(rightHalf); tEncodingToSequenceMap.put("ISO-8859-3", fullSet); tEncodings.add("ISO-8859-3"); } if (isEncodingSupported("ISO-8859-4")) { ControlSequence rightHalf = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x2D, 0x44 }); tSequenceToEncodingMap.put(rightHalf, "ISO-8859-4"); tHighBitsMap.put(rightHalf, Boolean.TRUE); ControlSequence fullSet = leftAscii.concatenate(rightHalf); tEncodingToSequenceMap.put("ISO-8859-4", fullSet); tEncodings.add("ISO-8859-4"); } if (isEncodingSupported("ISO-8859-5")) { ControlSequence rightHalf = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x2D, 0x4C }); tSequenceToEncodingMap.put(rightHalf, "ISO-8859-5"); tHighBitsMap.put(rightHalf, Boolean.TRUE); ControlSequence fullSet = leftAscii.concatenate(rightHalf); tEncodingToSequenceMap.put("ISO-8859-5", fullSet); tEncodings.add("ISO-8859-5"); } if (isEncodingSupported("ISO-8859-6")) { ControlSequence rightHalf = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x2D, 0x47 }); tSequenceToEncodingMap.put(rightHalf, "ISO-8859-6"); tHighBitsMap.put(rightHalf, Boolean.TRUE); ControlSequence fullSet = leftAscii.concatenate(rightHalf); tEncodingToSequenceMap.put("ISO-8859-6", fullSet); tEncodings.add("ISO-8859-6"); } if (isEncodingSupported("ISO-8859-7")) { ControlSequence rightHalf = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x2D, 0x46 }); tSequenceToEncodingMap.put(rightHalf, "ISO-8859-7"); tHighBitsMap.put(rightHalf, Boolean.TRUE); ControlSequence fullSet = leftAscii.concatenate(rightHalf); tEncodingToSequenceMap.put("ISO-8859-7", fullSet); tEncodings.add("ISO-8859-7"); } if (isEncodingSupported("ISO-8859-8")) { ControlSequence rightHalf = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x2D, 0x48 }); tSequenceToEncodingMap.put(rightHalf, "ISO-8859-8"); tHighBitsMap.put(rightHalf, Boolean.TRUE); ControlSequence fullSet = leftAscii.concatenate(rightHalf); tEncodingToSequenceMap.put("ISO-8859-8", fullSet); tEncodings.add("ISO-8859-8"); } if (isEncodingSupported("ISO-8859-9")) { ControlSequence rightHalf = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x2D, 0x4D }); tSequenceToEncodingMap.put(rightHalf, "ISO-8859-9"); tHighBitsMap.put(rightHalf, Boolean.TRUE); ControlSequence fullSet = leftAscii.concatenate(rightHalf); tEncodingToSequenceMap.put("ISO-8859-9", fullSet); tEncodings.add("ISO-8859-9"); } if (isEncodingSupported("JIS_X0201")) { ControlSequence glLeft = // high bit off, leave off new ControlSequence(new byte[] { 0x1B, 0x28, 0x4A }); ControlSequence glRight = // high bit off, turn on new ControlSequence(new byte[] { 0x1B, 0x28, 0x49 }); ControlSequence grLeft = // high bit on, turn off new ControlSequence(new byte[] { 0x1B, 0x29, 0x4A }); ControlSequence grRight = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x29, 0x49 }); tSequenceToEncodingMap.put(glLeft, "JIS_X0201"); tSequenceToEncodingMap.put(glRight, "JIS_X0201"); tSequenceToEncodingMap.put(grLeft, "JIS_X0201"); tSequenceToEncodingMap.put(grRight, "JIS_X0201"); tHighBitsMap.put(glLeft, Boolean.FALSE); tHighBitsMap.put(glRight, Boolean.TRUE); tHighBitsMap.put(grLeft, Boolean.FALSE); tHighBitsMap.put(grRight, Boolean.TRUE); ControlSequence fullSet = glLeft.concatenate(grRight); tEncodingToSequenceMap.put("JIS_X0201", fullSet); tEncodings.add("JIS_X0201"); } if (isEncodingSupported("X11GB2312")) { ControlSequence leftHalf = // high bit off, leave off new ControlSequence(new byte[] { 0x1B, 0x24, 0x28, 0x41 }); ControlSequence rightHalf = // high bit on, turn off new ControlSequence(new byte[] { 0x1B, 0x24, 0x29, 0x41 }); tSequenceToEncodingMap.put(leftHalf, "X11GB2312"); tSequenceToEncodingMap.put(rightHalf, "X11GB2312"); tHighBitsMap.put(leftHalf, Boolean.FALSE); tHighBitsMap.put(rightHalf, Boolean.FALSE); tEncodingToSequenceMap.put("X11GB2312", leftHalf); tEncodings.add("X11GB2312"); } if (isEncodingSupported("x-JIS0208")) { ControlSequence leftHalf = // high bit off, leave off new ControlSequence(new byte[] { 0x1B, 0x24, 0x28, 0x42 }); ControlSequence rightHalf = // high bit on, turn off new ControlSequence(new byte[] { 0x1B, 0x24, 0x29, 0x42 }); tSequenceToEncodingMap.put(leftHalf, "x-JIS0208"); tSequenceToEncodingMap.put(rightHalf, "x-JIS0208"); tHighBitsMap.put(leftHalf, Boolean.FALSE); tHighBitsMap.put(rightHalf, Boolean.FALSE); tEncodingToSequenceMap.put("x-JIS0208", leftHalf); tEncodings.add("x-JIS0208"); } if (isEncodingSupported("X11KSC5601")) { ControlSequence leftHalf = // high bit off, leave off new ControlSequence(new byte[] { 0x1B, 0x24, 0x28, 0x43 }); ControlSequence rightHalf = // high bit on, turn off new ControlSequence(new byte[] { 0x1B, 0x24, 0x29, 0x43 }); tSequenceToEncodingMap.put(leftHalf, "X11KSC5601"); tSequenceToEncodingMap.put(rightHalf, "X11KSC5601"); tHighBitsMap.put(leftHalf, Boolean.FALSE); tHighBitsMap.put(rightHalf, Boolean.FALSE); tEncodingToSequenceMap.put("X11KSC5601", leftHalf); tEncodings.add("X11KSC5601"); } // Encodings not listed in Compound Text Encoding spec // Esc seq: -b if (isEncodingSupported("ISO-8859-15")) { ControlSequence rightHalf = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x2D, 0x62 }); tSequenceToEncodingMap.put(rightHalf, "ISO-8859-15"); tHighBitsMap.put(rightHalf, Boolean.TRUE); ControlSequence fullSet = leftAscii.concatenate(rightHalf); tEncodingToSequenceMap.put("ISO-8859-15", fullSet); tEncodings.add("ISO-8859-15"); } // Esc seq: -T if (isEncodingSupported("TIS-620")) { ControlSequence rightHalf = // high bit on, leave on new ControlSequence(new byte[] { 0x1B, 0x2D, 0x54 }); tSequenceToEncodingMap.put(rightHalf, "TIS-620"); tHighBitsMap.put(rightHalf, Boolean.TRUE); ControlSequence fullSet = leftAscii.concatenate(rightHalf); tEncodingToSequenceMap.put("TIS-620", fullSet); tEncodings.add("TIS-620"); } if (isEncodingSupported("JIS_X0212-1990")) { ControlSequence leftHalf = // high bit off, leave off new ControlSequence(new byte[] { 0x1B, 0x24, 0x28, 0x44 }); ControlSequence rightHalf = // high bit on, turn off new ControlSequence(new byte[] { 0x1B, 0x24, 0x29, 0x44 }); tSequenceToEncodingMap.put(leftHalf, "JIS_X0212-1990"); tSequenceToEncodingMap.put(rightHalf, "JIS_X0212-1990"); tHighBitsMap.put(leftHalf, Boolean.FALSE); tHighBitsMap.put(rightHalf, Boolean.FALSE); tEncodingToSequenceMap.put("JIS_X0212-1990", leftHalf); tEncodings.add("JIS_X0212-1990"); } if (isEncodingSupported("X11CNS11643P1")) { ControlSequence leftHalf = // high bit off, leave off new ControlSequence(new byte[] { 0x1B, 0x24, 0x28, 0x47 }); ControlSequence rightHalf = // high bit on, turn off new ControlSequence(new byte[] { 0x1B, 0x24, 0x29, 0x47 }); tSequenceToEncodingMap.put(leftHalf, "X11CNS11643P1"); tSequenceToEncodingMap.put(rightHalf, "X11CNS11643P1"); tHighBitsMap.put(leftHalf, Boolean.FALSE); tHighBitsMap.put(rightHalf, Boolean.FALSE); tEncodingToSequenceMap.put("X11CNS11643P1", leftHalf); tEncodings.add("X11CNS11643P1"); } if (isEncodingSupported("X11CNS11643P2")) { ControlSequence leftHalf = // high bit off, leave off new ControlSequence(new byte[] { 0x1B, 0x24, 0x28, 0x48 }); ControlSequence rightHalf = // high bit on, turn off new ControlSequence(new byte[] { 0x1B, 0x24, 0x29, 0x48 }); tSequenceToEncodingMap.put(leftHalf, "X11CNS11643P2"); tSequenceToEncodingMap.put(rightHalf, "X11CNS11643P2"); tHighBitsMap.put(leftHalf, Boolean.FALSE); tHighBitsMap.put(rightHalf, Boolean.FALSE); tEncodingToSequenceMap.put("X11CNS11643P2", leftHalf); tEncodings.add("X11CNS11643P2"); } if (isEncodingSupported("X11CNS11643P3")) { ControlSequence leftHalf = // high bit off, leave off new ControlSequence(new byte[] { 0x1B, 0x24, 0x28, 0x49 }); ControlSequence rightHalf = // high bit on, turn off new ControlSequence(new byte[] { 0x1B, 0x24, 0x29, 0x49 }); tSequenceToEncodingMap.put(leftHalf, "X11CNS11643P3"); tSequenceToEncodingMap.put(rightHalf, "X11CNS11643P3"); tHighBitsMap.put(leftHalf, Boolean.FALSE); tHighBitsMap.put(rightHalf, Boolean.FALSE); tEncodingToSequenceMap.put("X11CNS11643P3", leftHalf); tEncodings.add("X11CNS11643P3"); } // Esc seq: %/2??SUN-KSC5601.1992-3 if (isEncodingSupported("x-Johab")) { // 0x32 looks wrong. It's copied from the Sun X11 Compound Text // support code. It implies that all Johab characters comprise two // octets, which isn't true. Johab supports the ASCII/KS-Roman // characters from 0x21-0x7E with single-byte representations. ControlSequence johab = new ControlSequence( new byte[] { 0x1b, 0x25, 0x2f, 0x32 }, new byte[] { 0x53, 0x55, 0x4e, 0x2d, 0x4b, 0x53, 0x43, 0x35, 0x36, 0x30, 0x31, 0x2e, 0x31, 0x39, 0x39, 0x32, 0x2d, 0x33 }); tSequenceToEncodingMap.put(johab, "x-Johab"); tEncodingToSequenceMap.put("x-Johab", johab); tEncodings.add("x-Johab"); } // Esc seq: %/2??SUN-BIG5-1 if (isEncodingSupported("Big5")) { // 0x32 looks wrong. It's copied from the Sun X11 Compound Text // support code. It implies that all Big5 characters comprise two // octets, which isn't true. Big5 supports the ASCII/CNS-Roman // characters from 0x21-0x7E with single-byte representations. ControlSequence big5 = new ControlSequence( new byte[] { 0x1b, 0x25, 0x2f, 0x32 }, new byte[] { 0x53, 0x55, 0x4e, 0x2d, 0x42, 0x49, 0x47, 0x35, 0x2d, 0x31 }); tSequenceToEncodingMap.put(big5, "Big5"); tEncodingToSequenceMap.put("Big5", big5); tEncodings.add("Big5"); } sequenceToEncodingMap = Collections.unmodifiableMap(tSequenceToEncodingMap); highBitsMap = Collections.unmodifiableMap(tHighBitsMap); encodingToSequenceMap = Collections.unmodifiableMap(tEncodingToSequenceMap); encodings = Collections.unmodifiableList(tEncodings); } private static boolean isEncodingSupported(String encoding) { try { if (Charset.isSupported(encoding)) return true; } catch (IllegalArgumentException x) { } return (getDecoder(encoding) != null && getEncoder(encoding) != null); } // For Decoder static CharsetDecoder getStandardDecoder(byte[] escSequence) { return getNonStandardDecoder(escSequence, null); } static boolean getHighBit(byte[] escSequence) { Boolean bool = (Boolean)highBitsMap.get (new ControlSequence(escSequence)); return (bool == Boolean.TRUE); } static CharsetDecoder getNonStandardDecoder(byte[] escSequence, byte[] encoding) { return getDecoder((String)sequenceToEncodingMap.get (new ControlSequence(escSequence, encoding))); } static CharsetDecoder getDecoder(String enc) { if (enc == null) { return null; } Charset cs = null; try { cs = Charset.forName(enc); } catch (IllegalArgumentException e) { Class cls; try { cls = Class.forName("sun.awt.motif." + enc); } catch (ClassNotFoundException ee) { return null; } try { cs = (Charset)cls.newInstance(); } catch (InstantiationException ee) { return null; } catch (IllegalAccessException ee) { return null; } } try { return cs.newDecoder(); } catch (UnsupportedOperationException e) {} return null; } // For Encoder static byte[] getEscapeSequence(String encoding) { ControlSequence seq = (ControlSequence) encodingToSequenceMap.get(encoding); if (seq != null) { return seq.escSequence; } return null; } static byte[] getEncoding(String encoding) { ControlSequence seq = (ControlSequence) encodingToSequenceMap.get(encoding); if (seq != null) { return seq.encoding; } return null; } static List getEncodings() { return encodings; } static CharsetEncoder getEncoder(String enc) { if (enc == null) { return null; } Charset cs = null; try { cs = Charset.forName(enc); } catch (IllegalArgumentException e) { Class cls; try { cls = Class.forName("sun.awt.motif." + enc); } catch (ClassNotFoundException ee) { return null; } try { cs = (Charset)cls.newInstance(); } catch (InstantiationException ee) { return null; } catch (IllegalAccessException ee) { return null; } } try { return cs.newEncoder(); } catch (Throwable e) {} return null; } // Not an instantiable class private CompoundTextSupport() {} }