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A set of Java™ Charset implementations supporting various codecs used in telecommunications

There is a newer version: 1.0.1

/*
 * Copyright © 2017-2018 Constantin Roganov
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
 * and associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package threegpp.charset.ucs2;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;

public class UCS2Encoder80 extends CharsetEncoder {

    private static final float AVG_BYTES_PER_CHAR = 2.0f;
    private static final float MAX_BYTES_PER_CHAR = 3.0f;

    private CharsetEncoder encoder = UCS2Charset80.underlyingCharset.newEncoder();
    private boolean inInitialState = true;

    UCS2Encoder80(UCS2Charset80 cs) {
        super(cs, AVG_BYTES_PER_CHAR, MAX_BYTES_PER_CHAR);
    }

    @Override
    protected CoderResult implFlush(ByteBuffer out) {
        finalizeEncoder();
        return encoder.flush(out);
    }

    @Override
    protected void implReset() {
        encoder.reset();
        inInitialState = true;
    }

    @Override
    public boolean canEncode(char c) {
        return encoder.canEncode(c);
    }

    @Override
    public boolean canEncode(CharSequence cs) {
        return encoder.canEncode(cs);
    }

    @Override
    protected CoderResult encodeLoop(CharBuffer in, ByteBuffer out) {
        if(inInitialState) {
            out.put((byte)UCS2Charset80.CHARSET_TAG);
            inInitialState = false;
        }
        return encoder.encode(in, out, false);
    }

    @Override
    public boolean isLegalReplacement(byte[] replacement) {
        return true;
    }

    private void finalizeEncoder() {
        CharBuffer emptyIn = CharBuffer.wrap("");
        ByteBuffer out = ByteBuffer.allocate(0);
        encoder.encode(emptyIn, out, true);
    }
}