duplicati/Duplicati/UnitTest/ZipFallbackTest.cs

// Copyright (C) 2026, The Duplicati Team
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using System;
using System.IO;
using System.Linq;
using Duplicati.Library.Utility;
using NUnit.Framework;
using System.Threading.Tasks;
using Assert = NUnit.Framework.Legacy.ClassicAssert;

namespace Duplicati.UnitTest
{
    public class ZipFallbackTest : BasicSetupHelper
    {
        [Test]
        [Category("Targeted")]
        public async Task FallbackToSharpCompressOnDecompressLzmaStreamsAsync()
        {
            var testopts = TestOptions;
            testopts["zip-compression-method"] = "lzma";
            testopts["zip-compression-library"] = "SharpCompress";
            testopts["blocksize"] = "50kb";

            var data = new byte[1024 * 1024 * 10];
            File.WriteAllBytes(Path.Combine(DATAFOLDER, "a"), data);
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
            {
                var r = await c.BackupAsync(new string[] { DATAFOLDER });
                Assert.AreEqual(0, r.Errors.Count());
                Assert.AreEqual(0, r.Warnings.Count());
            }

            // Delete the local database
            File.Delete(DBFILE);

            // Switch back to built-in compression
            testopts.Remove("zip-compression-method");
            testopts["zip-compression-library"] = "Auto";

            // Recreate the database
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
            {
                var r = await c.RepairAsync();
                Assert.AreEqual(0, r.Errors.Count());
                // Ensure that we get warnings for the fallback, one for the dlist and one for the dindex
                Assert.AreEqual(2, r.Warnings.Count());
                Assert.That(r.Warnings.All(x => x.Contains("lzma", StringComparison.OrdinalIgnoreCase)));
            }

            // Restore files
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts.Expand(new { restore_path = RESTOREFOLDER }), null))
            {
                var r = await c.RestoreAsync(null);
                Assert.AreEqual(0, r.Errors.Count());
                // Ensure that we get warnings for the fallback, one for the dblock file
                Assert.AreEqual(1, r.Warnings.Count());
                Assert.That(r.Warnings.All(x => x.Contains("lzma", StringComparison.OrdinalIgnoreCase)));
            }

            TestUtils.AssertDirectoryTreesAreEquivalent(DATAFOLDER, RESTOREFOLDER, true, "Restore");

        }

        [Test]
        [Category("Targeted")]
        [TestCase("zip-sc")]
        [TestCase("zip-io")]
        public async Task SupportZip64WithDefaultSettingsAsync(string module)
        {
            const long testfileSize = 5L * 1024 * 1024 * 1024;
            var testopts = TestOptions;
            testopts["blocksize"] = "50kb";

            if (module == "zip-sc")
            {
                module = "zip";
                testopts["zip-compression-library"] = "SharpCompress";
            }
            else if (module == "zip-io")
            {
                module = "zip";
                testopts["zip-compression-library"] = "BuiltIn";
            }

            string tempfilename;
            // Create a 5GiB file
            using var tempfile = new TempFile();
            {
                tempfilename = Path.GetFileName(tempfile.Name);
                using (var fs = File.OpenWrite(tempfile))
                    fs.SetLength(testfileSize);

                var data = new byte[1024 * 1024 * 10];
                File.WriteAllBytes(Path.Combine(DATAFOLDER, "a"), data);
                using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts.Expand(new { control_files = tempfile.Name }), null))
                    TestUtils.AssertResults(await c.BackupAsync(new string[] { DATAFOLDER }));
            }

            // Delete the local database
            File.Delete(DBFILE);

            // Recreate the database
            using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts, null))
                TestUtils.AssertResults(await c.RepairAsync());

            var restoredfile = Path.Combine(RESTOREFOLDER, tempfilename);
            try
            {
                // Restore control file
                using (var c = new Library.Main.Controller("file://" + TARGETFOLDER, testopts.Expand(new { restore_path = RESTOREFOLDER }), null))
                    TestUtils.AssertResults(await c.RestoreControlFilesAsync(["*"]));

                // Check that the control file was restored
                Assert.That(File.Exists(restoredfile), Is.True, "Control file was not restored");
                Assert.That(new FileInfo(restoredfile).Length, Is.EqualTo(testfileSize), "Control file had wrong size");
            }
            finally
            {
                // Delete the control file
                File.Delete(restoredfile);
            }

        }
    }
}