BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/POIFS/FileSystem/ODocumentInputStream.cs

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/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for Additional information regarding copyright ownership.
   The ASF licenses this file to You under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */


using System;
using Zephyr.Utils.NPOI.POIFS.Storage;
using System.IO;

namespace Zephyr.Utils.NPOI.POIFS.FileSystem
{
    /**
     * This class provides methods to read a DocumentEntry managed by a
     * {@link POIFSFileSystem} instance.
     *
     * @author Marc Johnson (mjohnson at apache dot org)
     */
    public class ODocumentInputStream : DocumentInputStream//DocumentReader
    {
        /** current offset into the Document */
        private long _current_offset;

        /** current marked offset into the Document (used by mark and Reset) */
        private long _marked_offset;

        /** the Document's size */
        private int _document_size;

        /** have we been closed? */
        private bool _closed;

        /** the actual Document */
        private POIFSDocument _document;

        /** the data block Containing the current stream pointer */
        private DataInputBlock _currentBlock;

        /**
         * Create an InputStream from the specified DocumentEntry
         * 
         * @param document the DocumentEntry to be read
         * 
         * @exception IOException if the DocumentEntry cannot be opened (like, maybe it has
         *                been deleted?)
         */
        public ODocumentInputStream(DocumentEntry document)
        {