ZipPackagePart.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Base / System / IO / Packaging / ZipPackagePart.cs / 1 / ZipPackagePart.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: 
//  This is a subclass for the abstract PackagePart class. 
//  This implementation is specific to Zip file format.
// 
// History:
//  12/28/2004: [....]: Initial creation. [[....] provided some of the
//                                           initial code]
// 
//-----------------------------------------------------------------------------
 
using System; 
using System.Collections.Generic;
using MS.Internal.IO.Zip; 
using MS.Internal.IO.Packaging;
using MS.Internal;                          // for Invariant

namespace System.IO.Packaging 
{
    ///  
    /// This class represents a Part within a Zip container. 
    /// This is a part of the Packaging Layer APIs
    ///  
   public sealed class ZipPackagePart : PackagePart
   {
        //-----------------------------------------------------
        // 
        //  Public Constructors
        // 
        //----------------------------------------------------- 
        // None
        //------------------------------------------------------ 
        //
        //  Public Properties
        //
        //----------------------------------------------------- 
        // None
        //------------------------------------------------------ 
        // 
        //  Public Methods
        // 
        //------------------------------------------------------

        #region Public Methods
 
        /// 
        /// Custom Implementation for the GetStream Method 
        ///  
        /// Mode in which the stream should be opened
        /// Access with which the stream should be opened 
        /// Stream Corresponding to this part
        protected override Stream GetStreamCore(FileMode mode, FileAccess access)
        {
            if (Package.InStreamingCreation) 
            {
                // Convert Metro CompressionOption to Zip CompressionMethodEnum. 
                CompressionMethodEnum compressionMethod; 
                DeflateOptionEnum deflateOption;
                ZipPackage.GetZipCompressionMethodFromOpcCompressionOption(this.CompressionOption, 
                    out compressionMethod, out deflateOption);

                // Mode and access get validated in StreamingZipPartStream().
                return new StreamingZipPartStream( 
                    PackUriHelper.GetStringForPartUri(this.Uri),
                    _zipArchive, 
                    compressionMethod, deflateOption, 
                    mode, access);
            } 
            else if (_zipFileInfo != null)
            {
                // Case of an atomic part.
                return _zipFileInfo.GetStream(mode, access); 
            }
            else 
            { 
                // Case of an interleaved part.
                Invariant.Assert(_pieces != null); 
                return new InterleavedZipPartStream(this, mode, access);
            }
        }
 
        #endregion Public Methods
 
        //----------------------------------------------------- 
        //
        //  Public Events 
        //
        //------------------------------------------------------
        // None
        //----------------------------------------------------- 
        //
        //  Internal Constructors 
        // 
        //-----------------------------------------------------
 
        #region Internal Constructors

        /// 
        /// Constructs a ZipPackagePart for an atomic (i.e. non-interleaved) part. 
        /// This is called from the ZipPackage class as a result of GetPartCore,
        /// GetPartsCore or CreatePartCore methods 
        ///  
        /// 
        ///  
        /// 
        /// 
        /// 
        internal ZipPackagePart(ZipPackage container, 
            ZipFileInfo zipFileInfo,
            PackUriHelper.ValidatedPartUri partUri, 
            string contentType, 
            CompressionOption compressionOption)
            :base(container, partUri, contentType, compressionOption) 
        {
            _zipArchive = zipFileInfo.ZipArchive;
            _zipFileInfo = zipFileInfo;
        } 

        ///  
        /// Constructs a ZipPackagePart. This is called from ZipPackage.CreatePartCore in streaming 
        /// production.
        /// No piece is created until the first write operation on the associated stream. Therefore 
        /// this constructor does not take a ZipFileInfo.
        /// 
        /// 
        ///  
        /// 
        ///  
        ///  
        internal ZipPackagePart(ZipPackage container,
            ZipArchive zipArchive, 
            PackUriHelper.ValidatedPartUri partUri,
            string contentType,
            CompressionOption compressionOption)
            :base(container, partUri, contentType, compressionOption) 
        {
            _zipArchive = zipArchive; 
        } 

        ///  
        /// Constructs a ZipPackagePart for an interleaved part. This is called outside of streaming
        /// production when an interleaved part is encountered in the package.
        /// 
        ///  
        /// 
        ///  
        ///  
        /// 
        ///  
        internal ZipPackagePart(ZipPackage container,
            ZipArchive zipArchive,
            List pieces,
            PackUriHelper.ValidatedPartUri partUri, 
            string contentType,
            CompressionOption compressionOption) 
            :base(container, partUri, contentType, compressionOption) 
        {
            _zipArchive = zipArchive; 
            _pieces = pieces;
        }

        #endregion Internal Constructors 

        //----------------------------------------------------- 
        // 
        //  Internal Properties
        // 
        //------------------------------------------------------

       #region Internal Properties
 
       /// 
       /// Obtain the sorted array of piece descriptors for an interleaved part. 
       ///  
       internal List PieceDescriptors
       { 
           get
           {
               return _pieces;
           } 
       }
 
       ///  
       /// Obtain the ZipFileInfo descriptor of an atomic part.
       ///  
       internal ZipFileInfo ZipFileInfo
       {
           get
           { 
               return _zipFileInfo;
           } 
       } 

       #endregion Internal Properties 

        //-----------------------------------------------------
        //
        //  Internal Methods 
        //
        //------------------------------------------------------ 
        // None 
        //------------------------------------------------------
        // 
        //  Internal Events
        //
        //-----------------------------------------------------
        // None 
        //------------------------------------------------------
        // 
        //  Private Methods 
        //
        //----------------------------------------------------- 
        // None
        //-----------------------------------------------------
        //
        //  Private Fields 
        //
        //----------------------------------------------------- 
 
        #region Private Variables
 
        // Zip item info for an atomic part.
        private ZipFileInfo     _zipFileInfo;

        // Piece descriptors for an interleaved part. 
        private List _pieces;
 
        //ZipArhive 
        private ZipArchive     _zipArchive;
 
        #endregion Private Variables

        //------------------------------------------------------
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ZipPackagePart.cs source code in C# .NET

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