2002-01-30 21:22:28 -05:00
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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2003-04-30 00:39:21 -04:00
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* Copyright (c) 2003 The Apache Software Foundation. All rights
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2002-01-30 21:22:28 -05:00
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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" and
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* "Apache POI" must not be used to endorse or promote products
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* derived from this software without prior written permission. For
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* written 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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* "Apache POI", nor may "Apache" appear in their name, without
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* prior written 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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package org.apache.poi.poifs.storage;
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2002-03-14 21:47:56 -05:00
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import org.apache.poi.poifs.common.POIFSConstants;
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2003-07-31 15:35:19 -04:00
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import org.apache.poi.util.IOUtils;
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import java.io.*;
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/**
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* A big block created from an InputStream, holding the raw data
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*
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* @author Marc Johnson (mjohnson at apache dot org
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*/
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public class RawDataBlock
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implements ListManagedBlock
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{
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private byte[] _data;
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private boolean _eof;
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/**
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* Constructor RawDataBlock
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*
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* @param stream the InputStream from which the data will be read
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*
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* @exception IOException on I/O errors, and if an insufficient
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* amount of data is read
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*/
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public RawDataBlock(final InputStream stream)
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throws IOException
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{
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_data = new byte[ POIFSConstants.BIG_BLOCK_SIZE ];
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int count = IOUtils.readFully(stream, _data);
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if (count == -1)
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{
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_eof = true;
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}
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else if (count != POIFSConstants.BIG_BLOCK_SIZE)
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{
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String type = " byte" + ((count == 1) ? ("")
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: ("s"));
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throw new IOException("Unable to read entire block; " + count
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+ type + " read; expected "
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+ POIFSConstants.BIG_BLOCK_SIZE + " bytes");
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}
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else
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{
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_eof = false;
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}
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}
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/**
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* When we read the data, did we hit end of file?
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*
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* @return true if no data was read because we were at the end of
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* the file, else false
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*
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* @exception IOException
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*/
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public boolean eof()
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throws IOException
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{
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return _eof;
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}
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/* ********** START implementation of ListManagedBlock ********** */
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/**
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* Get the data from the block
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*
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* @return the block's data as a byte array
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*
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* @exception IOException if there is no data
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*/
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public byte [] getData()
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throws IOException
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{
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if (eof())
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{
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throw new IOException("Cannot return empty data");
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}
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return _data;
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}
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/* ********** END implementation of ListManagedBlock ********** */
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} // end public class RawDataBlock
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