/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for Additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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/* ================================================================
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* About NPOI
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* Author: Tony Qu
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* Author's email: tonyqus (at) gmail.com
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* Author's Blog: tonyqus.wordpress.com.cn (wp.tonyqus.cn)
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* HomePage: http://www.codeplex.com/npoi
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* Contributors:
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*
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* ==============================================================*/
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.IO;
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using HH.WMS.Utils.NPOI.POIFS.Common;
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using HH.WMS.Utils.NPOI.Util;
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namespace HH.WMS.Utils.NPOI.POIFS.Storage
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{
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/// <summary>
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/// A big block created from an InputStream, holding the raw data
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/// @author Marc Johnson (mjohnson at apache dot org
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/// </summary>
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public class RawDataBlock : ListManagedBlock
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{
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private byte[] _data;
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private bool _eof;
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private bool _hasData;
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private static POILogger log = POILogFactory.GetLogger(typeof(RawDataBlock));
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/// <summary>
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/// Constructor RawDataBlock
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/// </summary>
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/// <param name="stream">the Stream from which the data will be read</param>
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public RawDataBlock(Stream stream)
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: this(stream, POIFSConstants.SMALLER_BIG_BLOCK_SIZE)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="RawDataBlock"/> class.
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/// </summary>
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/// <param name="stream">the Stream from which the data will be read</param>
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/// <param name="blockSize">the size of the POIFS blocks, normally 512 bytes {@link POIFSConstants#BIG_BLOCK_SIZE}</param>
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public RawDataBlock(Stream stream, int blockSize)
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{
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_data = new byte[blockSize];
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int count = IOUtils.ReadFully(stream, _data);
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_hasData = (count > 0);
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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 != blockSize)
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{
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// IOUtils.readFully will always read the
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// requested number of bytes, unless it hits
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// an EOF
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_eof = true;
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String type = " byte" + ((count == 1) ? ("")
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: ("s"));
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log.Log(POILogger.ERROR,
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"Unable to read entire block; " + count
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+ type + " read before EOF; expected "
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+ blockSize + " bytes. Your document "
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+ "was either written by software that "
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+ "ignores the spec, or has been truncated!"
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);
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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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/// <summary>
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/// When we read the data, did we hit end of file?
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/// </summary>
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/// <value><c>true</c> if the EoF was hit during this block, or; otherwise, <c>false</c>if not. If you have a dodgy short last block, then
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/// it's possible to both have data, and also hit EoF...</value>
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public bool EOF
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{
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get { return _eof; }
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}
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/// <summary>
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/// Did we actually find any data to read? It's possible,
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/// in the event of a short last block, to both have hit
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/// the EoF, but also to have data
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/// </summary>
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/// <value><c>true</c> if this instance has data; otherwise, <c>false</c>.</value>
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public bool HasData
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{
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get { return _hasData; }
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}
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/// <summary>
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/// Get the data from the block
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/// </summary>
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/// <value>the block's data as a byte array</value>
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public byte[] Data
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{
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get
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{
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if (!HasData)
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{
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// TODO return null instead of raising an unexpected exception (CA1065)
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//return null;
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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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}
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public override string ToString()
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{
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return "RawDataBlock of size " + _data.Length;
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}
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public int BigBlockSize
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{
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get { return _data.Length; }
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}
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}
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}
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