BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Compress/Ionic/CRC32.cs

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// CRC32.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 18:25:54>
//
// ------------------------------------------------------------------
//
// This module defines the CRC32 class, which can do the CRC32 algorithm, using
// arbitrary starting polynomials, and bit reversal. The bit reversal is what
// distinguishes this CRC-32 used in BZip2 from the CRC-32 that is used in PKZIP
// files, or GZIP files. This class does both.
//
// ------------------------------------------------------------------


using System;
using Interop = System.Runtime.InteropServices;

namespace Zephyr.Utils.Ionic.Crc
{
    /// <summary>
    ///   Computes a CRC-32. The CRC-32 algorithm is parameterized - you
    ///   can set the polynomial and enable or disable bit
    ///   reversal. This can be used for GZIP, BZip2, or ZIP.
    /// </summary>
    /// <remarks>
    ///   This type is used internally by DotNetZip; it is generally not used
    ///   directly by applications wishing to create, read, or manipulate zip
    ///   archive files.
    /// </remarks>

    [Interop.GuidAttribute("ebc25cf6-9120-4283-b972-0e5520d0000C")]
    [Interop.ComVisible(true)]
#if !NETCF
    [Interop.ClassInterface(Interop.ClassInterfaceType.AutoDispatch)]
#endif
    public class CRC32
    {
        /// <summary>
        ///   Indicates the total number of bytes applied to the CRC.
        /// </summary>
        public Int64 TotalBytesRead
        {
            get
            {
                return _TotalBytesRead;
            }