adamhathcock/sharpcompress

HttpBaseStream Gzip extract - NotSupportedException

Ilanlido opened this issue · 4 comments

Ilanlido commented

Hi, looks like when trying to decompress a gzip through httpStream it throws NotSupportedException on Position when setting EntryStartPosition. what is the purpose of settings this field? how can i mitigate the problem? Thanks!

System.NotSupportedException: Specified method is not supported.
   at System.Net.Http.HttpBaseStream.get_Position()
   at SharpCompress.IO.RewindableStream.get_Position()
   at SharpCompress.Common.GZip.GZipFilePart..ctor(Stream stream, ArchiveEncoding archiveEncoding)
   at SharpCompress.Common.GZip.GZipEntry.GetEntries(Stream stream, OptionsBase options)+MoveNext()

P.S i'd prefer to not save the file to disk and read it again as FileStream if possible
If that's not possible which types require random access? i know that .tar.gz works perfectly fine through http for example, Thanks in advance!

adamhathcock commented

You'll have to show me how you're calling things.

GZipFilePart does check CanSeek but Rewindable is meant to buffer unbufferable streams so shouldn't be used here.

adamhathcock commented

Actually, I take that back, GZipFilePart has a usage of Position no matter seeking. That should be changed

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Ilanlido commented

I'm not familiar with the internals of how Gzip works, but again, why do we need EntryStartPosition? isn't there only one entry always in .gz? maybe i can help :)

adamhathcock commented

you're right but I'm not sure why I'm doing that....I'd have to look and remember

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