NotSupportedException for forward-only reading of unseekable ConnectStream

[AlexVallat]

When using ZipReader over the ConnectStream obtained from a HttpWebResponse, it fails at the second call of MoveToNextEntry due to attempting to access the .Position of the underlying stream. ConnectStream does not support .Position as it does not support seeking.

[adamhathcock]

Can you give me the full stack trace? It definitely shouldn't be doing that.

[adamhathcock]

Never mind, I reproduced it.

[AlexVallat]

Just in case, I might as well post the stack anyway now that I've captured it:

System.NotSupportedException: This stream does not support seek operations.
   at System.Net.ConnectStream.get_Position()
   at SharpCompress.IO.NonDisposingStream.get_Position() in d:\dev\SharpCompress\src\SharpCompress\IO\NonDisposingStream.cs:line 46
   at SharpCompress.IO.RewindableStream.get_Position() in d:\dev\SharpCompress\src\SharpCompress\IO\RewindableStream.cs:line 97
   at SharpCompress.Common.Zip.StreamingZipHeaderFactory.<ReadStreamHeader>d__0.MoveNext() in d:\dev\SharpCompress\src\SharpCompress\Common\Zip\StreamingZipHeaderFactory.cs:line 34
   at SharpCompress.Reader.Zip.ZipReader.<GetEntries>d__0.MoveNext() in d:\dev\SharpCompress\src\SharpCompress\Reader\Zip\ZipReader.cs:line 46
   at SharpCompress.Reader.AbstractReader`2.NextEntryForCurrentStream() in d:\dev\SharpCompress\src\SharpCompress\Reader\AbstractReader.cs:line 137
   at SharpCompress.Reader.AbstractReader`2.MoveToNextEntry() in d:\dev\SharpCompress\src\SharpCompress\Reader\AbstractReader.cs:line 102

[AlexVallat]

Thanks for the quick response!

[adamhathcock]

https://www.nuget.org/packages/sharpcompress/0.12.4