BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/POIFS/FileSystem/DocumentOutputStream.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.
==================================================================== */

namespace Zephyr.Utils.NPOI.POIFS.FileSystem
{
    using System;
    using System.IO;
    using Zephyr.Utils.NPOI.Util;

    /**
     * This class provides a wrapper over an OutputStream so that Document
     * Writers can't accidently go over their size limits
     *
     * @author Marc Johnson (mjohnson at apache dot org)
     */

    public class DocumentOutputStream : MemoryStream
    {
        private Stream _stream;
        private int _limit;
        private int _written;

        /**
         * Create a DocumentOutputStream
         *
         * @param stream the OutputStream to which the data is actually
         *               read
         * @param limit the maximum number of bytes that can be written
         */
        public DocumentOutputStream(Stream stream, int limit)
        {
            _stream = stream;
            _limit = limit;
            _written = 0;
        }

        /**
         * Writes the specified byte to this output stream. The general
         * contract for write is that one byte is written to the output
         * stream. The byte to be written is the eight low-order bits of
         * the argument b. The 24 high-order bits of b are ignored.
         *
         * @param b the byte.
         * @exception IOException if an I/O error occurs. In particular,
         *                        an IOException may be thrown if the
         *                        output stream has been closed, or if the