xenadmin/XenCenterLib/Archive/ZipArchiveWriter.cs

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using System;
using System.IO;
using System.IO.Compression;


namespace XenCenterLib.Archive
{
    internal class ZipArchiveWriter : ArchiveWriter
    {
        private ZipArchive _zipArchive;
        private bool _disposed;

        /// <summary>
        /// Parameterless constructor needed by tests
        /// </summary>
        public ZipArchiveWriter()
        {
        }

        public ZipArchiveWriter(Stream outputStream)
        {
            _zipArchive = new ZipArchive(outputStream, ZipArchiveMode.Create);
        }

        public override void SetBaseStream(Stream outputStream)
        {
            _zipArchive = new ZipArchive(outputStream, ZipArchiveMode.Create);
            _disposed = false;
        }

        public override void AddDirectory(string directoryName, DateTime modificationTime)
        {
            //Need to add a trailing front-slash to add a directory
            if (!directoryName.EndsWith("/"))
                directoryName += "/";

            var entry = _zipArchive.CreateEntry(directoryName);
            entry.LastWriteTime = modificationTime;
        }

        public override void Add(Stream fileToAdd, string fileName, DateTime modificationTime, Action cancellingDelegate)
        {
            var entry = _zipArchive.CreateEntry(fileName);
            entry.LastWriteTime = modificationTime;

            //You have to do this because if using a memory stream the pointer will be at the end it
            //it's just been read and this will cause nothing to be written out
            fileToAdd.Position = 0;

            using (var entryStream = entry.Open())
                StreamUtilities.BufferedStreamCopy(fileToAdd, entryStream);
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing && !_disposed)
            {
                _zipArchive?.Dispose();
                _disposed = true;
            }

            base.Dispose(disposing);
        }
    }
}