mcs/class/System.IO.Compression/SharpCompress/Reader/ReaderFactory.cs

   1 using System;
   2 using System.IO;
   3 #if GZIP
   4 using SharpCompress.Archive.GZip;
   5 #endif
   6 #if RAR
   7 using SharpCompress.Archive.Rar;
   8 #endif
   9 #if TAR
  10 using SharpCompress.Archive.Tar;
  11 #endif
  12 using SharpCompress.Archive.Zip;
  13 using SharpCompress.Common;
  14 using SharpCompress.Compressor;
  15 #if BZIP2
  16 using SharpCompress.Compressor.BZip2;
  17 #endif
  18 using SharpCompress.IO;
  19 #if GZIP
  20 using SharpCompress.Reader.GZip;
  21 #endif
  22 #if RAR
  23 using SharpCompress.Reader.Rar;
  24 #endif
  25 #if TAR
  26 using SharpCompress.Reader.Tar;
  27 #endif
  28 using SharpCompress.Reader.Zip;
  29 #if DEFLATE
  30 using GZipStream = SharpCompress.Compressor.Deflate.GZipStream;
  31 #endif
  32
  33 namespace SharpCompress.Reader
  34 {
  35     internal static class ReaderFactory
  36     {
  37         /// <summary>
  38         /// Opens a Reader for Non-seeking usage
  39         /// </summary>
  40         /// <param name="stream"></param>
  41         /// <param name="options"></param>
  42         /// <returns></returns>
  43         public static IReader Open(Stream stream, Options options = Options.KeepStreamsOpen)
  44         {
  45             stream.CheckNotNull("stream");
  46
  47             RewindableStream rewindableStream = new RewindableStream(stream);
  48             rewindableStream.StartRecording();
  49             if (ZipArchive.IsZipFile(rewindableStream, null))
  50             {
  51                 rewindableStream.Rewind(true);
  52                 return ZipReader.Open(rewindableStream, null, options);
  53             }
  54 #if GZIP
  55             rewindableStream.Rewind(false);
  56             if (GZipArchive.IsGZipFile(rewindableStream))
  57             {
  58                 rewindableStream.Rewind(false);
  59                 GZipStream testStream = new GZipStream(rewindableStream, CompressionMode.Decompress);
  60                 if (TarArchive.IsTarFile(testStream))
  61                 {
  62                     rewindableStream.Rewind(true);
  63                     return new TarReader(rewindableStream, CompressionType.GZip, options);
  64                 }
  65                 rewindableStream.Rewind(true);
  66                 return GZipReader.Open(rewindableStream, options);
  67             }
  68 #endif
  69
  70 #if BZIP2
  71             rewindableStream.Rewind(false);
  72             if (BZip2Stream.IsBZip2(rewindableStream))
  73             {
  74                 rewindableStream.Rewind(false);
  75                 BZip2Stream testStream = new BZip2Stream(rewindableStream, CompressionMode.Decompress, false);
  76 #if TAR
  77                 if (TarArchive.IsTarFile(testStream))
  78                 {
  79                     rewindableStream.Rewind(true);
  80                     return new TarReader(rewindableStream, CompressionType.BZip2, options);
  81                 }
  82 #endif
  83             }
  84 #endif
  85
  86 #if TAR
  87             rewindableStream.Rewind(false);
  88             if (TarArchive.IsTarFile(rewindableStream))
  89             {
  90                 rewindableStream.Rewind(true);
  91                 return TarReader.Open(rewindableStream, options);
  92             }
  93 #endif
  94 #if RAR
  95             rewindableStream.Rewind(false);
  96             if (RarArchive.IsRarFile(rewindableStream, options))
  97             {
  98                 rewindableStream.Rewind(true);
  99                 return RarReader.Open(rewindableStream, options);
 100             }
 101 #endif
 102
 103             throw new InvalidOperationException("Cannot determine compressed stream type.  Supported Reader Formats: Zip, GZip, BZip2, Tar, Rar");
 104         }
 105     }
 106 }