CODEWITHSUNDEEP
c#
eocron
eocron

Reputation: 7536

How to ignore timestamps when creating Zip File?

I have multiple servers making same task of generating some file/folder data, and need to pack it before callback, then diff it, but stumble across problem in which two identical data folders creating two different archives. Im using this function:

ZipFile.CreateFromDirectory(...)

And this is applied to same data in different folders:

C:\a\data\* 
C:\b\data\*

Which creates two different zip archives, and only difference is their header and footer. But if I create two archives in from single folder - it is identical. I suppose some timestamps (creation data, modification data, etc) is written to archive.

How one can specify that archives created from same data should be identical? (Ignoring global meta information)

Upvotes: 3

Views: 2724

Answers (1)

eocron
eocron

Reputation: 7536

Well, problem were solver pretty easly by creating archive from folder manually, and setting last modification time of entries:

    public static void ZipDirectory(string input, string output, CompressionLevel level)
    {

        input = Path.GetFullPath(input);
        using (var fs = File.OpenWrite(output))
        using (var za = new ZipArchive(fs, ZipArchiveMode.Create))
        {
            foreach (var filePath in Directory.GetFiles(input, "*", SearchOption.AllDirectories).OrderBy(x => x))
            {
                var name = filePath.Replace(input, "").TrimStart('\\', '/');
                var e = za.CreateEntry(name, level);
                using (var zes = e.Open())
                {
                    using (var fes = File.OpenRead(filePath))
                    {
                        fes.CopyTo(zes);
                    }
                }
            }
        }

        using (var za = ZipFile.Open(output, ZipArchiveMode.Update))
        {
            foreach (var e in za.Entries)
            {
                e.LastWriteTime = new DateTimeOffset(1980, 1, 1, 0, 0, 0, 0, TimeSpan.Zero);
            }
        }
    }

This way my zip archives ignores any unrelevant meta information about files.

Upvotes: 1

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