| |
| /* ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2003 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Apache" and "Apache Software Foundation" and |
| * "Apache POI" must not be used to endorse or promote products |
| * derived from this software without prior written permission. For |
| * written permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * "Apache POI", nor may "Apache" appear in their name, without |
| * prior written permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| package org.apache.poi.poifs.storage; |
| |
| import org.apache.poi.poifs.common.POIFSConstants; |
| import org.apache.poi.util.IOUtils; |
| |
| import java.io.*; |
| |
| /** |
| * A big block created from an InputStream, holding the raw data |
| * |
| * @author Marc Johnson (mjohnson at apache dot org |
| */ |
| |
| public class RawDataBlock |
| implements ListManagedBlock |
| { |
| private byte[] _data; |
| private boolean _eof; |
| |
| /** |
| * Constructor RawDataBlock |
| * |
| * @param stream the InputStream from which the data will be read |
| * |
| * @exception IOException on I/O errors, and if an insufficient |
| * amount of data is read |
| */ |
| |
| public RawDataBlock(final InputStream stream) |
| throws IOException |
| { |
| _data = new byte[ POIFSConstants.BIG_BLOCK_SIZE ]; |
| int count = IOUtils.readFully(stream, _data); |
| |
| if (count == -1) |
| { |
| _eof = true; |
| } |
| else if (count != POIFSConstants.BIG_BLOCK_SIZE) |
| { |
| String type = " byte" + ((count == 1) ? ("") |
| : ("s")); |
| |
| throw new IOException("Unable to read entire block; " + count |
| + type + " read; expected " |
| + POIFSConstants.BIG_BLOCK_SIZE + " bytes"); |
| } |
| else |
| { |
| _eof = false; |
| } |
| } |
| |
| /** |
| * When we read the data, did we hit end of file? |
| * |
| * @return true if no data was read because we were at the end of |
| * the file, else false |
| * |
| * @exception IOException |
| */ |
| |
| public boolean eof() |
| throws IOException |
| { |
| return _eof; |
| } |
| |
| /* ********** START implementation of ListManagedBlock ********** */ |
| |
| /** |
| * Get the data from the block |
| * |
| * @return the block's data as a byte array |
| * |
| * @exception IOException if there is no data |
| */ |
| |
| public byte [] getData() |
| throws IOException |
| { |
| if (eof()) |
| { |
| throw new IOException("Cannot return empty data"); |
| } |
| return _data; |
| } |
| |
| /* ********** END implementation of ListManagedBlock ********** */ |
| } // end public class RawDataBlock |
| |