1 2 /* ==================================================================== 3 * The Apache Software License, Version 1.1 4 * 5 * Copyright (c) 2002 The Apache Software Foundation. All rights 6 * reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. The end-user documentation included with the redistribution, 21 * if any, must include the following acknowledgment: 22 * "This product includes software developed by the 23 * Apache Software Foundation (http://www.apache.org/)." 24 * Alternately, this acknowledgment may appear in the software itself, 25 * if and wherever such third-party acknowledgments normally appear. 26 * 27 * 4. The names "Apache" and "Apache Software Foundation" and 28 * "Apache POI" must not be used to endorse or promote products 29 * derived from this software without prior written permission. For 30 * written permission, please contact apache@apache.org. 31 * 32 * 5. Products derived from this software may not be called "Apache", 33 * "Apache POI", nor may "Apache" appear in their name, without 34 * prior written permission of the Apache Software Foundation. 35 * 36 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 37 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 38 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 39 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 42 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 43 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 44 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 45 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 46 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 47 * SUCH DAMAGE. 48 * ==================================================================== 49 * 50 * This software consists of voluntary contributions made by many 51 * individuals on behalf of the Apache Software Foundation. For more 52 * information on the Apache Software Foundation, please see 53 * <http://www.apache.org/>. 54 */ 55 56 package org.apache.poi.poifs.storage; 57 58 import org.apache.poi.poifs.common.POIFSConstants; 59 60 import java.io.*; 61 62 /** 63 * A big block created from an InputStream, holding the raw data 64 * 65 * @author Marc Johnson (mjohnson at apache dot org 66 */ 67 68 public class RawDataBlock 69 implements ListManagedBlock 70 { 71 private byte[] _data; 72 private boolean _eof; 73 74 /** 75 * Constructor RawDataBlock 76 * 77 * @param stream the InputStream from which the data will be read 78 * 79 * @exception IOException on I/O errors, and if an insufficient 80 * amount of data is read 81 */ 82 83 public RawDataBlock(final InputStream stream) 84 throws IOException 85 { 86 _data = new byte[ POIFSConstants.BIG_BLOCK_SIZE ]; 87 int count = stream.read(_data); 88 89 if (count == -1) 90 { 91 _eof = true; 92 } 93 else if (count != POIFSConstants.BIG_BLOCK_SIZE) 94 { 95 String type = " byte" + ((count == 1) ? ("") 96 : ("s")); 97 98 throw new IOException("Unable to read entire block; " + count 99 + type + " read; expected " 100 + POIFSConstants.BIG_BLOCK_SIZE + " bytes"); 101 } 102 else 103 { 104 _eof = false; 105 } 106 } 107 108 /** 109 * When we read the data, did we hit end of file? 110 * 111 * @return true if no data was read because we were at the end of 112 * the file, else false 113 * 114 * @exception IOException 115 */ 116 117 public boolean eof() 118 throws IOException 119 { 120 return _eof; 121 } 122 123 /* ********** START implementation of ListManagedBlock ********** */ 124 125 /** 126 * Get the data from the block 127 * 128 * @return the block's data as a byte array 129 * 130 * @exception IOException if there is no data 131 */ 132 133 public byte [] getData() 134 throws IOException 135 { 136 if (eof()) 137 { 138 throw new IOException("Cannot return empty data"); 139 } 140 return _data; 141 } 142 143 /* ********** END implementation of ListManagedBlock ********** */ 144 } // end public class RawDataBlock 145 146