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SharpCompress fails to validate tar compressed using zstd #690

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opened 2026-01-29 22:15:56 +00:00 by claunia · 0 comments
claunia commented 2026-01-29 22:15:56 +00:00
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Originally created by @SimonCahill on GitHub (Jul 14, 2025).

It's been a while since I've actively used this library, but I'd had good experiences in the past, so I decided to use it once more.

I have the following test case:

[TestMethod]
public async Task TestCompressDirectory_ZstCompressedTar_FileInRoot() {
    var tmpFile = Path.GetTempFileName();
    var fileBytes = GenerateRandomMemory(4096);
    File.WriteAllBytes(tmpFile, fileBytes.ToArray());

    var tmpPath = new DirectoryInfo(Path.Combine(Path.GetTempPath(), "HermodTests", "EmailArchiverTests", nameof(TestCompressDirectory_ZstCompressedTar_FileInRoot)));
    tmpPath.Create();

    File.Move(tmpFile, Path.Combine(tmpPath.FullName, Path.GetFileName(tmpFile)));

    await m_emailArchiver.CompressDirectoryAsync(tmpPath, CompressionType.Squeezed);
    var expectedPath = Path.Combine(tmpPath.Parent?.FullName ?? string.Empty, $"{nameof(TestCompressDirectory_ZstCompressedTar_FileInRoot)}.tzst");

    Assert.IsTrue(File.Exists(expectedPath), $"Archive file ({expectedPath}) was not created.");

    using var fStream = File.OpenRead(expectedPath);

    if (fStream.Length < 512) {
        // This is likely not a valid Zstandard compressed file.
        Assert.Fail($"Archive file ({expectedPath}) is not a valid Zstandard compressed file.");
    }

    Assert.IsTrue(VerifyTarHeader(), $"Archive file ({expectedPath}) is not a valid TAR file after decompression.");

    fStream.Seek(0, SeekOrigin.Begin);
    using var zstDecompStream = new DecompressionStream(fStream);
    using var tarArchive = TarArchive.Open(zstDecompStream);

    var entries = tarArchive.Entries.ToList(); // HERE!

    Assert.IsTrue(entries.Any(), $"Archive file ({expectedPath}) is empty.");

    bool VerifyTarHeader() {
        using var zstDecompStream = new DecompressionStream(fStream);

        Assert.IsTrue(zstDecompStream.CanRead, $"Archive file ({expectedPath}) is not a valid Zstandard compressed stream.");
        return TarArchive.IsTarFile(zstDecompStream);
    }
}

Interestingly, it fails to detect the tar header in the marked line.

The VerifyTarHeader method works as expected and doesn't throw.

Checking the debugger, I get the following information:

Image 
   at SharpCompress.Archives.Tar.TarArchive.<LoadEntries>d__11.MoveNext()
   at SharpCompress.Helpers.LazyReadOnlyCollection`1.LazyLoader.MoveNext()
   at SharpCompress.Helpers.Utility.ForEach[T](IEnumerable`1 items, Action`1 action)
   at SharpCompress.Helpers.LazyReadOnlyCollection`1.EnsureFullyLoaded()
   at SharpCompress.Archives.AbstractArchive`2.SharpCompress.Archives.IArchiveExtractionListener.EnsureEntriesLoaded()
   at SharpCompress.Archives.AbstractArchive`2.get_IsComplete()

Below is a hex dump of the zst file:

00000000: 28b5 2ffd 0058 8588 00bc 0d01 2e61 7263  (./..X.......arc
00000010: 6869 6e66 6f00 2020 2020 3737 3720 2030  hinfo.    777  0
00000020: 2020 3233 3400 3135 3033 3532 3534 3635    234.1503525465
00000030: 3200 2020 2035 3531 3420 4845 524d 4f44  2.   5514 HERMOD
00000040: 0000 0098 0100 0000 1095 6f75 5f41 1a86  ..........ou_A..
00000050: 4d95 9fbe c2fe ef1c bd00 0000 20f7 1fae  M........... ...
00000060: d45b 80e6 eace e16a 62ec eabf 79ce d1ad  .[.....jb...y...
00000070: 9b6d 1a81 0622 714d 3c9b 9c52 a900 0000  .m..."qM<..R....
00000080: 552f 746d 702f 4865 726d 6f64 5465 7374  U/tmp/HermodTest
00000090: 732f 456d 6169 6c41 7263 6869 7665 7254  s/EmailArchiverT
000000a0: 6573 7443 6f6d 7072 6573 7344 6972 6563  estCompressDirec
000000b0: 746f 7279 5f5a 6564 5461 725f 4669 6c65  tory_ZedTar_File
000000c0: 496e 526f 6f74 746d 7031 6259 5246 4b2e  InRoottmp1bYRFK.
000000d0: 746d 7031 3030 3030 3632 3133 b1f3 d49f  tmp100006213....
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00001080: 6465 03df 7d71 3479 0820 62de dafc 5a7d  de..}q4y. b...Z}
00001090: 9027 7bb8 836c 3b63 7d3e 65e9 d1db 6b27  .'{..l;c}>e...k'
000010a0: 59a0 7a03 297f 8ed3 70b8 f280 9bcc 9fb8  Y.z.)...p.......
000010b0: 7cd5 d054 fc3b daf5 9140 77b1 95a2 3c14  |..T.;...@w...<.
000010c0: e7aa a831 5e76 bf6d bf30 e023 3356 23a2  ...1^v.m.0.#3V#.
000010d0: 0c3a a75f fdfc b656 8c62 468d 0000 0000  .:._...V.bF.....
000010e0: 0000 0000 0000 0010 008e 7215 b000 6172  ..........r...ar
000010f0: 71d4 2a06 5402 101d 208b c139 0480 f70d  q.*.T... ..9....
00001100: a600 4175 a915 27ec d226 6608 a05a 8d62  ..Au..'..&f..Z.b
00001110: a601 daad b4fb 2680 04                   ......&..

Extracting the compressed data and piping into the tar command yields the desired results:

❯ zstdcat *.tzst | tar --list
.archinfo
tmp1bYRFK.tmp

I'll include the files here, too. The .bin is just the .tzst repackaged as a sanity check that the file command is reporting correctly.

TestCompressDirectory_ZstCompressedTar_FileInRoot.bin.txt
TestCompressDirectory_ZstCompressedTar_FileInRoot.tar.txt
TestCompressDirectory_ZstCompressedTar_FileInRoot.tzst.txt

Am I missing something, or have I stumbled on a bug?

Originally created by @SimonCahill on GitHub (Jul 14, 2025). It's been a while since I've actively used this library, but I'd had good experiences in the past, so I decided to use it once more. I have the following test case: ```cs [TestMethod] public async Task TestCompressDirectory_ZstCompressedTar_FileInRoot() { var tmpFile = Path.GetTempFileName(); var fileBytes = GenerateRandomMemory(4096); File.WriteAllBytes(tmpFile, fileBytes.ToArray()); var tmpPath = new DirectoryInfo(Path.Combine(Path.GetTempPath(), "HermodTests", "EmailArchiverTests", nameof(TestCompressDirectory_ZstCompressedTar_FileInRoot))); tmpPath.Create(); File.Move(tmpFile, Path.Combine(tmpPath.FullName, Path.GetFileName(tmpFile))); await m_emailArchiver.CompressDirectoryAsync(tmpPath, CompressionType.Squeezed); var expectedPath = Path.Combine(tmpPath.Parent?.FullName ?? string.Empty, $"{nameof(TestCompressDirectory_ZstCompressedTar_FileInRoot)}.tzst"); Assert.IsTrue(File.Exists(expectedPath), $"Archive file ({expectedPath}) was not created."); using var fStream = File.OpenRead(expectedPath); if (fStream.Length < 512) { // This is likely not a valid Zstandard compressed file. Assert.Fail($"Archive file ({expectedPath}) is not a valid Zstandard compressed file."); } Assert.IsTrue(VerifyTarHeader(), $"Archive file ({expectedPath}) is not a valid TAR file after decompression."); fStream.Seek(0, SeekOrigin.Begin); using var zstDecompStream = new DecompressionStream(fStream); using var tarArchive = TarArchive.Open(zstDecompStream); var entries = tarArchive.Entries.ToList(); // HERE! Assert.IsTrue(entries.Any(), $"Archive file ({expectedPath}) is empty."); bool VerifyTarHeader() { using var zstDecompStream = new DecompressionStream(fStream); Assert.IsTrue(zstDecompStream.CanRead, $"Archive file ({expectedPath}) is not a valid Zstandard compressed stream."); return TarArchive.IsTarFile(zstDecompStream); } } ``` Interestingly, it fails to detect the tar header in the marked line. The `VerifyTarHeader` method works as expected and doesn't throw. Checking the debugger, I get the following information: <img width="881" height="510" alt="Image" src="https://github.com/user-attachments/assets/463f750d-fcbf-4066-8da4-ef7e7715eeb7" /> ``` at SharpCompress.Archives.Tar.TarArchive.<LoadEntries>d__11.MoveNext() at SharpCompress.Helpers.LazyReadOnlyCollection`1.LazyLoader.MoveNext() at SharpCompress.Helpers.Utility.ForEach[T](IEnumerable`1 items, Action`1 action) at SharpCompress.Helpers.LazyReadOnlyCollection`1.EnsureFullyLoaded() at SharpCompress.Archives.AbstractArchive`2.SharpCompress.Archives.IArchiveExtractionListener.EnsureEntriesLoaded() at SharpCompress.Archives.AbstractArchive`2.get_IsComplete() ``` Below is a hex dump of the zst file: ``` 00000000: 28b5 2ffd 0058 8588 00bc 0d01 2e61 7263 (./..X.......arc 00000010: 6869 6e66 6f00 2020 2020 3737 3720 2030 hinfo. 777 0 00000020: 2020 3233 3400 3135 3033 3532 3534 3635 234.1503525465 00000030: 3200 2020 2035 3531 3420 4845 524d 4f44 2. 5514 HERMOD 00000040: 0000 0098 0100 0000 1095 6f75 5f41 1a86 ..........ou_A.. 00000050: 4d95 9fbe c2fe ef1c bd00 0000 20f7 1fae M........... ... 00000060: d45b 80e6 eace e16a 62ec eabf 79ce d1ad .[.....jb...y... 00000070: 9b6d 1a81 0622 714d 3c9b 9c52 a900 0000 .m..."qM<..R.... 00000080: 552f 746d 702f 4865 726d 6f64 5465 7374 U/tmp/HermodTest 00000090: 732f 456d 6169 6c41 7263 6869 7665 7254 s/EmailArchiverT 000000a0: 6573 7443 6f6d 7072 6573 7344 6972 6563 estCompressDirec 000000b0: 746f 7279 5f5a 6564 5461 725f 4669 6c65 tory_ZedTar_File 000000c0: 496e 526f 6f74 746d 7031 6259 5246 4b2e InRoottmp1bYRFK. 000000d0: 746d 7031 3030 3030 3632 3133 b1f3 d49f tmp100006213.... 000000e0: 3ebf dee4 1b44 8743 e3f7 79b7 6df4 94bc >....D.C..y.m... 000000f0: bc55 f538 f52c a68f 0502 5841 707b 0963 .U.8.,....XAp{.c 00000100: 3525 d66e e113 5497 3af4 3406 2a22 4aea 5%.n..T.:.4.*"J. 00000110: 101b 2cb7 98aa c4b5 f0fe 0b60 a614 5df0 ..,........`..]. 00000120: c26c 8490 525a 50a7 1870 b3e3 fb02 e697 .l..RZP..p...... 00000130: 2bf6 8cc4 3c80 fdf6 6c37 5754 dcc8 9760 +...<...l7WT...` 00000140: 34ce 2011 c978 7dcf a4b3 54f3 ae13 8281 4. ..x}...T..... 00000150: 1fc3 aa82 1263 4761 337a b3cd 87b3 6c32 .....cGa3z....l2 00000160: 040b b64f a11d 90e9 c1ae 372d a9d8 4765 ...O......7-..Ge 00000170: bebd 1f0b 1709 a823 7055 4f98 2d4d cbfe .......#pUO.-M.. 00000180: 7f4b 38fb 520a df3b d4a8 2ea6 2c51 704d .K8.R..;....,QpM 00000190: 0aba 20dd 8608 dcf5 d3ad 50df d8ea 6853 .. .......P...hS 000001a0: 3311 0dbd cf01 d2b6 9f3a b51f 659d db19 3........:..e... 000001b0: 7cfe 0ff7 83ab 5913 7d66 15e6 6a0e a207 |.....Y.}f..j... 000001c0: f0e4 3379 a10f 543c 0eec 80de 171b 1767 ..3y..T<.......g 000001d0: 39a6 9485 2671 0b66 f4a3 f3b9 425a 4489 9...&q.f....BZD. 000001e0: a681 9921 42e1 ed9b 5f46 7faa d64a 8a31 ...!B..._F...J.1 000001f0: dca0 d65d 4fc5 0056 cf71 19ee 0af8 3e56 ...]O..V.q....>V 00000200: a06b 9c18 76a0 3685 52a2 b9e8 5d10 0777 .k..v.6.R...]..w 00000210: 4274 4de5 bdfb ada8 b916 dd82 99a6 3f70 BtM...........?p 00000220: 6ed3 fc8e 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a0b4 AQU....b...W.... 00001020: 4bb0 e3d3 24a6 7a88 6086 0af3 38b3 869d K...$.z.`...8... 00001030: fd2c 47b1 a0fd b05a 620c 6acb 8ff9 4db5 .,G....Zb.j...M. 00001040: 4af3 34a0 5b76 3520 836f 79e7 fe4b 4ded J.4.[v5 .oy..KM. 00001050: 93ba 0b19 b548 113d 1215 9052 c1e8 8380 .....H.=...R.... 00001060: 413c 2e27 7500 cfe5 5562 36e1 7fd7 b03c A<.'u...Ub6....< 00001070: 400d 93f7 7ab5 cd02 aa91 57ba e4a7 6443 @...z.....W...dC 00001080: 6465 03df 7d71 3479 0820 62de dafc 5a7d de..}q4y. b...Z} 00001090: 9027 7bb8 836c 3b63 7d3e 65e9 d1db 6b27 .'{..l;c}>e...k' 000010a0: 59a0 7a03 297f 8ed3 70b8 f280 9bcc 9fb8 Y.z.)...p....... 000010b0: 7cd5 d054 fc3b daf5 9140 77b1 95a2 3c14 |..T.;...@w...<. 000010c0: e7aa a831 5e76 bf6d bf30 e023 3356 23a2 ...1^v.m.0.#3V#. 000010d0: 0c3a a75f fdfc b656 8c62 468d 0000 0000 .:._...V.bF..... 000010e0: 0000 0000 0000 0010 008e 7215 b000 6172 ..........r...ar 000010f0: 71d4 2a06 5402 101d 208b c139 0480 f70d q.*.T... ..9.... 00001100: a600 4175 a915 27ec d226 6608 a05a 8d62 ..Au..'..&f..Z.b 00001110: a601 daad b4fb 2680 04 ......&.. ``` Extracting the compressed data and piping into the `tar` command yields the desired results: ``` ❯ zstdcat *.tzst | tar --list .archinfo tmp1bYRFK.tmp ``` I'll include the files here, too. The `.bin` is just the `.tzst` repackaged as a sanity check that the `file` command is reporting correctly. [TestCompressDirectory_ZstCompressedTar_FileInRoot.bin.txt](https://github.com/user-attachments/files/21221539/TestCompressDirectory_ZstCompressedTar_FileInRoot.bin.txt) [TestCompressDirectory_ZstCompressedTar_FileInRoot.tar.txt](https://github.com/user-attachments/files/21221541/TestCompressDirectory_ZstCompressedTar_FileInRoot.tar.txt) [TestCompressDirectory_ZstCompressedTar_FileInRoot.tzst.txt](https://github.com/user-attachments/files/21221540/TestCompressDirectory_ZstCompressedTar_FileInRoot.tzst.txt) Am I missing something, or have I stumbled on a bug?
claunia added the bugup for grabs labels 2026-01-29 22:15:56 +00:00
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Reference: starred/sharpcompress#690
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