220 lines
7.3 KiB
Java
220 lines
7.3 KiB
Java
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/*
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* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2003 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution,
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* if any, must include the following acknowledgment:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowledgment may appear in the software itself,
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* if and wherever such third-party acknowledgments normally appear.
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*
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* 4. The names "Apache" and "Apache Software Foundation" must
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* not be used to endorse or promote products derived from this
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* software without prior written permission. For written
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* permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache",
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* nor may "Apache" appear in their name, without prior written
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* permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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* Portions of this software are based upon public domain software
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* originally written at the National Center for Supercomputing Applications,
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* University of Illinois, Urbana-Champaign.
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*
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* Portions of this software are based upon public domain software
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* originally written at the National Center for Supercomputing Applications,
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* University of Illinois, Urbana-Champaign.
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*/
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package org.apache.poi.hpsf;
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import java.io.IOException;
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import java.io.OutputStream;
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import org.apache.poi.util.LittleEndian;
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import org.apache.poi.util.LittleEndianConsts;
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/**
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* <p>Class for writing little-endian data and more.</p>
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*
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* @author Rainer Klute (klute@rainer-klute.de)
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* @version $Id$
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* @since 2003-02-20
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*/
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public class TypeWriter
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{
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/**
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* <p>Writes a two-byte value (short) to an output stream.</p>
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*
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* @param out The stream to write to
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* @param n The value to write
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* @exception IOException if an I/O error occurs
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*/
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public static int writeToStream(final OutputStream out, final short n)
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throws IOException
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{
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final int length = LittleEndian.SHORT_SIZE;
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byte[] buffer = new byte[length];
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LittleEndian.putUShort(buffer, 0, n);
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out.write(buffer, 0, length);
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return length;
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}
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/**
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* <p>Writes a four-byte value to an output stream.</p>
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*
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* @param out The stream to write to.
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* @param n The value to write.
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* @exception IOException if an I/O error occurs
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* @return The number of bytes written to the output stream.
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*/
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public static int writeToStream(final OutputStream out, final int n)
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throws IOException
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{
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final int l = LittleEndian.INT_SIZE;
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final byte[] buffer = new byte[l];
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LittleEndian.putInt(buffer, 0, n);
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out.write(buffer, 0, l);
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return l;
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}
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/**
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* <p>Writes an unsigned two-byte value to an output stream.</p>
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*
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* @param out The stream to write to
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* @param n The value to write
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* @exception IOException if an I/O error occurs
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*/
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public static void writeUShortToStream(final OutputStream out, final int n)
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throws IOException
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{
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int high = n & 0xFFFF0000;
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if (high != 0)
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throw new IllegalPropertySetDataException
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("Value " + n + " cannot be represented by 2 bytes.");
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writeToStream(out, (short) n);
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}
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/**
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* <p>Writes an unsigned four-byte value to an output stream.</p>
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*
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* @param out The stream to write to.
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* @param n The value to write.
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* @return The number of bytes that have been written to the output stream.
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* @exception IOException if an I/O error occurs
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*/
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public static int writeUIntToStream(final OutputStream out, final long n)
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throws IOException
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{
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long high = n & 0xFFFFFFFF00000000L;
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if (high != 0)
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throw new IllegalPropertySetDataException
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("Value " + n + " cannot be represented by 4 bytes.");
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return writeToStream(out, (int) n);
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}
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/**
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* <p>Writes a 16-byte {@link ClassID} to an output stream.</p>
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*
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* @param out The stream to write to
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* @param n The value to write
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* @exception IOException if an I/O error occurs
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*/
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public static int writeToStream(final OutputStream out, final ClassID n)
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throws IOException
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{
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byte[] b = new byte[16];
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n.write(b, 0);
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out.write(b, 0, b.length);
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return b.length;
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}
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/**
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* <p>Writes an array of {@link Property} instances to an output stream
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* according to the Horrible Property Stream Format.</p>
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*
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* @param out The stream to write to
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* @param properties The array to write to the stream
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* @exception IOException if an I/O error occurs
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*/
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public static void writeToStream(final OutputStream out,
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final Property[] properties)
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throws IOException, UnsupportedVariantTypeException
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{
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/* If there are no properties don't write anything. */
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if (properties == null)
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return;
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/* Write the property list. This is a list containing pairs of property
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* ID and offset into the stream. */
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for (int i = 0; i < properties.length; i++)
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{
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final Property p = (Property) properties[i];
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writeUIntToStream(out, p.getID());
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writeUIntToStream(out, p.getSize());
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}
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/* Write the properties themselves. */
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for (int i = 0; i < properties.length; i++)
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{
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final Property p = (Property) properties[i];
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long type = p.getType();
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writeUIntToStream(out, type);
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VariantSupport.write(out, (int) type, p.getValue());
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}
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}
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}
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