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Multi-volume Rar streams #170

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opened 2026-01-29 22:07:45 +00:00 by claunia · 2 comments
claunia commented 2026-01-29 22:07:45 +00:00
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Originally created by @krvi on GitHub (Apr 20, 2017).

I'm attempting to read the contents of multi-volume Rar archive. The archive is never written to disk so I need to read them as streams. I do the following steps.
1: Declare a dictionary, rather than List, simply for ease of ordering/sorting.
var rd = new Dictionary<string, Stream>();
2: Populate the dictionary.
2.5: Ensure that the streams are ordered. For example:
file.part1.rar
file.part2.rar
file.part2.rar
or
file.rar
file.r00
file.r01
3: Open archive
var ra = RarArchive.Open(rd.Values.AsEnumerable());

From what I've read it is supposed to work with this procedure. However, it does not work.
ra.WriteToDirectory(@"C:\test\"); Produces nothing and neither does

foreach (var e in ra.Entries)
    {
          e.WriteToDirectory(@"C:\test\");
          //or
          var fs = new FileStream(@"C:\test\" + e.Key, FileMode.Create, FileAccess.Write);
          e.WriteTo(fs);
          fs.Close();
    }

If I open the archive with only the first volume with ArchiveFactory
var ra = ArchiveFactory.Open(rd.Values.First());
It works, for the whole files in the first volume. I can successfully use them and write them to disk.

What am I missing to be able to read the whole archive? Is this intended behavior or a bug?

Originally created by @krvi on GitHub (Apr 20, 2017). I'm attempting to read the contents of multi-volume Rar archive. The archive is never written to disk so I need to read them as streams. I do the following steps. 1: Declare a dictionary, rather than List, simply for ease of ordering/sorting. `var rd = new Dictionary<string, Stream>();` 2: Populate the dictionary. 2.5: Ensure that the streams are ordered. For example: _file.part1.rar file.part2.rar file.part2.rar_ or _file.rar file.r00 file.r01_ 3: Open archive `var ra = RarArchive.Open(rd.Values.AsEnumerable());` From what I've [read](http://sharpcompress2.rssing.com/chan-6339576/all_p3.html) it is supposed to work with this procedure. However, it does not work. `ra.WriteToDirectory(@"C:\test\");` Produces nothing and neither does ``` foreach (var e in ra.Entries) { e.WriteToDirectory(@"C:\test\"); //or var fs = new FileStream(@"C:\test\" + e.Key, FileMode.Create, FileAccess.Write); e.WriteTo(fs); fs.Close(); } ``` If I open the archive with only the first volume with ArchiveFactory `var ra = ArchiveFactory.Open(rd.Values.First());` It works, for the _whole_ files _in the first volume_. I can successfully use them and write them to disk. What am I missing to be able to read the whole archive? Is this intended behavior or a bug?
claunia commented 2026-01-29 22:07:45 +00:00
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@adamhathcock commented on GitHub (Apr 20, 2017):

It does work. Here's a relevant test: https://github.com/adamhathcock/sharpcompress/blob/master/test/SharpCompress.Test/Rar/RarArchiveTests.cs#L191

I would think it's because Dictionary.Values.GetEnumerator doesn't return any guaranteed order.

@adamhathcock commented on GitHub (Apr 20, 2017): It does work. Here's a relevant test: https://github.com/adamhathcock/sharpcompress/blob/master/test/SharpCompress.Test/Rar/RarArchiveTests.cs#L191 I would think it's because `Dictionary.Values.GetEnumerator` doesn't return any guaranteed order.
claunia commented 2026-01-29 22:07:46 +00:00
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@krvi commented on GitHub (Apr 22, 2017):

Thanks for the reply. My issue was a bit more embarrassing though; the streams' position was at the end.
It works fine now, with the generic collections that I have tried, List/Dictionary/SortedDictionary/OrderedDictionary etc. Extracts even if it's out of order! but split-files are understandably split, heh.
Thanks for a nice library.

@krvi commented on GitHub (Apr 22, 2017): Thanks for the reply. My issue was a bit more embarrassing though; the streams' position was at the end. It works fine now, with the generic collections that I have tried, List/Dictionary/SortedDictionary/OrderedDictionary etc. Extracts even if it's out of order! but split-files are understandably split, heh. Thanks for a nice library.
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