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Reading from 7z entry stream using Read(Span<byte>) might read too many bytes #495

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opened 2026-01-29 22:12:54 +00:00 by claunia · 0 comments
claunia commented 2026-01-29 22:12:54 +00:00
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Originally created by @Molinarius on GitHub (Feb 11, 2022).

With .NET 5 and .NET 6, I noticed that reading from an entry stream from certain 7z file reads too many bytes when the Read(Span<byte>) overload is used.

E.g.:

using (var archive = SevenZipArchive.Open("test.7z"))
{
    var entry = archive.Entries.First(entry => entry.Key == "test.txt");
    using (var stream = entry.OpenEntryStream())
    {
        byte[] buffer = new byte[1024];
        int bytesRead = stream.Read(buffer.AsSpan()); // stream.Read(buffer, 0, 1024) works
        Console.WriteLine(bytesRead);
    }
}

With the sample 7z file attached (I had to put it into a zip file test.zip to be able to upload it), this reads 18 bytes instead of the expected 12 bytes. The Read(byte[], int, int) overload works for me as expected.

Using version 0.30.1 from NuGet.

Originally created by @Molinarius on GitHub (Feb 11, 2022). With .NET 5 and .NET 6, I noticed that reading from an entry stream from certain 7z file reads too many bytes when the `Read(Span<byte>)` overload is used. E.g.: using (var archive = SevenZipArchive.Open("test.7z")) { var entry = archive.Entries.First(entry => entry.Key == "test.txt"); using (var stream = entry.OpenEntryStream()) { byte[] buffer = new byte[1024]; int bytesRead = stream.Read(buffer.AsSpan()); // stream.Read(buffer, 0, 1024) works Console.WriteLine(bytesRead); } } With the sample 7z file attached (I had to put it into a zip file [test.zip](https://github.com/adamhathcock/sharpcompress/files/8047989/test.zip) to be able to upload it), this reads 18 bytes instead of the expected 12 bytes. The `Read(byte[], int, int)` overload works for me as expected. Using version 0.30.1 from NuGet.
claunia added the bugup for grabs labels 2026-01-29 22:12:54 +00:00
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Reference: starred/sharpcompress#495
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