Subversion Repositories mkgmap

/*
 * Copyright (C) 2007 Steve Ratcliffe
 * 
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 * 
 *  This program 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 for more details.
 * 
 * 
 * Author: Steve Ratcliffe
 * Create date: 23-Sep-2007
 */
package uk.me.parabola.io;

import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import uk.me.parabola.imgfmt.ExitException;
import uk.me.parabola.imgfmt.app.labelenc.CharacterEncoder;
import uk.me.parabola.imgfmt.app.labelenc.EncodedText;

import static uk.me.parabola.imgfmt.app.labelenc.BaseEncoder.NO_TEXT;

/**
 * An output stream that has methods for writing strings and little endian
 * integers.  Its a bit like DataOutput, but for little endian.
 *
 * @author Steve Ratcliffe
 */
public class StructuredOutputStream extends FilterOutputStream {

        private final CharacterEncoder encoder;

        public StructuredOutputStream(OutputStream out, CharacterEncoder encoder) {
                super(out);
                this.encoder = encoder;
        }

        public void write(int b) throws IOException {
                out.write(b);
        }

        public void write2(int b) throws IOException {
                out.write(b);
                out.write(b >> 8);
        }

        public void write3(int i) throws IOException {
                out.write(i);
                out.write(i >> 8);
                out.write(i >> 16);
        }

        public void write4(int b) throws IOException {
                out.write(b);
                out.write(b >> 8);
                out.write(b >> 16);
                out.write(b >> 24);
        }

        /**
         * Writes a string including a terminating null byte.
         *
         * For each character in the string the low-order byte is written.
         *
         * @param s The string to write.
         * @throws IOException If the write fails.
         */
        public void writeString(String s) throws IOException {
                if (encoder == null)
                        throw new ExitException("tdbfile: character encoding is null");

                EncodedText encodedText = encoder.encodeText(s);
                if (encodedText == NO_TEXT)
                        return;

                out.write(encodedText.getCtext(), 0, encodedText.getLength());
        }
}