mcs/class/System.IO.Compression/SharpCompress/Reader/Zip/ZipReader.cs

   1 using System.Collections.Generic;
   2 using System.IO;
   3 using SharpCompress.Common;
   4 using SharpCompress.Common.Zip;
   5 using SharpCompress.Common.Zip.Headers;
   6
   7 namespace SharpCompress.Reader.Zip
   8 {
   9     internal class ZipReader : AbstractReader<ZipEntry, ZipVolume>
  10     {
  11         private readonly StreamingZipHeaderFactory headerFactory;
  12         private readonly ZipVolume volume;
  13
  14         internal ZipReader(Stream stream, Options options, string password)
  15             : base(options, ArchiveType.Zip)
  16         {
  17             volume = new ZipVolume(stream, options);
  18             headerFactory = new StreamingZipHeaderFactory(password);
  19         }
  20
  21         public override ZipVolume Volume
  22         {
  23             get { return volume; }
  24         }
  25
  26         #region Open
  27
  28         /// <summary>
  29         /// Opens a ZipReader for Non-seeking usage with a single volume
  30         /// </summary>
  31         /// <param name="stream"></param>
  32         /// <param name="options"></param>
  33         /// <param name="password"></param>
  34         /// <returns></returns>
  35         public static ZipReader Open(Stream stream, string password = null,
  36                                      Options options = Options.KeepStreamsOpen)
  37         {
  38             stream.CheckNotNull("stream");
  39             return new ZipReader(stream, options, password);
  40         }
  41
  42         #endregion
  43
  44         internal override IEnumerable<ZipEntry> GetEntries(Stream stream)
  45         {
  46             foreach (ZipHeader h in headerFactory.ReadStreamHeader(stream))
  47             {
  48                 if (h != null)
  49                 {
  50                     switch (h.ZipHeaderType)
  51                     {
  52                         case ZipHeaderType.LocalEntry:
  53                             {
  54                                 yield return new ZipEntry(new StreamingZipFilePart(h as LocalEntryHeader,
  55                                                                                    stream));
  56                             }
  57                             break;
  58                         case ZipHeaderType.DirectoryEnd:
  59                             {
  60                                 yield break;
  61                             }
  62                     }
  63                 }
  64             }
  65         }
  66     }
  67 }