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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/* ====================================================================
   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.util;

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

public final class LittleEndianOutputStream extends FilterOutputStream implements LittleEndianOutput {
    public LittleEndianOutputStream(OutputStream out) {
        super(out);
    }

    @Override
    public void writeByte(int v) {
        try {
            out.write(v);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void writeDouble(double v) {
        writeLong(Double.doubleToLongBits(v));
    }

    @Override
    public void writeInt(int v) {
        int b3 = (v >>> 24) & 0xFF;
        int b2 = (v >>> 16) & 0xFF;
        int b1 = (v >>>  8) & 0xFF;
        int b0 = (v) & 0xFF;
        try {
            out.write(b0);
            out.write(b1);
            out.write(b2);
            out.write(b3);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void writeLong(long v) {
        writeInt((int)(v/* >>  0*/));
        writeInt((int)(v >> 32));
    }

    @Override
    public void writeShort(int v) {
        int b1 = (v >>>  8) & 0xFF;
        int b0 = (v) & 0xFF;
        try {
            out.write(b0);
            out.write(b1);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
    @Override
    public void write(byte[] b) {
        // suppress IOException for interface method
        try {
            super.write(b);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
    @Override
    public void write(byte[] b, int off, int len) {
        // suppress IOException for interface method
        try {
            super.write(b, off, len);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }


    /**
     * Put unsigned int into output stream
     *
     * @param value
     *            the int (32-bit) value
     */
    public void writeUInt( long value ) {
        try {
            out.write( (byte) ( ( value ) & 0xFF ) );
            out.write( (byte) ( ( value >>> 8 ) & 0xFF ) );
            out.write( (byte) ( ( value >>> 16 ) & 0xFF ) );
            out.write( (byte) ( ( value >>> 24 ) & 0xFF ) );
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Put unsigned short into output stream
     *
     * @param value
     *            the unsigned short (16-bit) value
     */
    public void putUShort( int value ) {
        try {
            out.write( (byte) ( ( value ) & 0xFF ) );
            out.write( (byte) ( ( value >>> 8 ) & 0xFF ) );
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}