BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Compress/Ionic/BZip2/ParallelBZip2OutputStream.cs

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//#define Trace

// ParallelBZip2OutputStream.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2011 Dino Chiesa.
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// Last Saved: <2011-August-02 16:44:24>
//
// ------------------------------------------------------------------
//
// This module defines the ParallelBZip2OutputStream class, which is a
// BZip2 compressing stream. This code was derived in part from Apache
// commons source code. The license below applies to the original Apache
// code.
//
// ------------------------------------------------------------------
// flymake: csc.exe /t:module BZip2InputStream.cs BZip2Compressor.cs Rand.cs BCRC32.cs @@FILE@@


/*
 * 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.
 */


// Design Notes:
//
// This class follows the classic Decorator pattern: it is a Stream that
// wraps itself around a Stream, and in doing so provides bzip2
// compression as callers Write into it.  It is exactly the same in
// outward function as the BZip2OutputStream, except that this class can
// perform compression using multiple independent threads. Because of
// that, and because of the CPU-intensive nature of BZip2 compression,
// this class can perform significantly better (in terms of wall-click