TypeWriter.java

/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */

package org.apache.poi.hpsf;

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

import org.apache.poi.util.LittleEndian;

/**
 * <p>Class for writing little-endian data and more.</p>
 *
 * @author Rainer Klute <a
 * href="mailto:klute@rainer-klute.de"><klute@rainer-klute.de></a>
 */
public class TypeWriter
{

    /**
     * <p>Writes a two-byte value (short) to an output stream.</p>
     *
     * @param out The stream to write to.
     * @param n The value to write.
     * @return The number of bytes that have been written.
     * @exception IOException if an I/O error occurs
     */
    public static int writeToStream(final OutputStream out, final short n)
        throws IOException
    {
        final int length = LittleEndian.SHORT_SIZE;
        byte[] buffer = new byte[length];
        LittleEndian.putShort(buffer, 0, n); // FIXME: unsigned
        out.write(buffer, 0, length);
        return length;
    }



    /**
     * <p>Writes a four-byte value to an output stream.</p>
     *
     * @param out The stream to write to.
     * @param n The value to write.
     * @exception IOException if an I/O error occurs
     * @return The number of bytes written to the output stream. 
     */
    public static int writeToStream(final OutputStream out, final int n)
        throws IOException
    {
        final int l = LittleEndian.INT_SIZE;
        final byte[] buffer = new byte[l];
        LittleEndian.putInt(buffer, 0, n);
        out.write(buffer, 0, l);
        return l;
        
    }



    /**
     * <p>Writes a eight-byte value to an output stream.</p>
     *
     * @param out The stream to write to.
     * @param n The value to write.
     * @exception IOException if an I/O error occurs
     * @return The number of bytes written to the output stream. 
     */
    public static int writeToStream(final OutputStream out, final long n)
        throws IOException
    {
        final int l = LittleEndian.LONG_SIZE;
        final byte[] buffer = new byte[l];
        LittleEndian.putLong(buffer, 0, n);
        out.write(buffer, 0, l);
        return l;
        
    }


    /**
     * <p>Writes an unsigned four-byte value to an output stream.</p>
     *
     * @param out The stream to write to.
     * @param n The value to write.
     * @return The number of bytes that have been written to the output stream.
     * @exception IOException if an I/O error occurs
     */
    public static int writeUIntToStream(final OutputStream out, final long n)
        throws IOException
    {
        long high = n & 0xFFFFFFFF00000000L;
        if (high != 0 && high != 0xFFFFFFFF00000000L)
            throw new IllegalPropertySetDataException
                ("Value " + n + " cannot be represented by 4 bytes.");
        return writeToStream(out, (int) n);
    }



    /**
     * <p>Writes a 16-byte {@link ClassID} to an output stream.</p>
     *
     * @param out The stream to write to
     * @param n The value to write
     * @return The number of bytes written
     * @exception IOException if an I/O error occurs
     */
    public static int writeToStream(final OutputStream out, final ClassID n)
        throws IOException
    {
        byte[] b = new byte[16];
        n.write(b, 0);
        out.write(b, 0, b.length);
        return b.length;
    }




    /**
     * <p>Writes a double value value to an output stream.</p>
     *
     * @param out The stream to write to.
     * @param n The value to write.
     * @exception IOException if an I/O error occurs
     * @return The number of bytes written to the output stream. 
     */
    public static int writeToStream(final OutputStream out, final double n)
        throws IOException
    {
        final int l = LittleEndian.DOUBLE_SIZE;
        final byte[] buffer = new byte[l];
        LittleEndian.putDouble(buffer, 0, n);
        out.write(buffer, 0, l);
        return l;
    }

}