How do I decode an encoded Base64 zip file to a new zip file?

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I'm trying to create a zip file out of an encoded base64 string, but I'm stuck at getting the files from the string.

I have been able to create the zip file out of it, but I don't see the file that should be in it.

My code so far:

public static void Main(string[] args)
{
    IConfiguration config = new ConfigurationBuilder()
        .AddJsonFile("appsettings.json", false, true)
        .Build();

    var fileName = args[0];
    var path = $"{config["zipPath"]}\\{fileName}";

    byte[] zipBytes = Convert.FromBase64String(args[1]);
    using(var memoryStream = new MemoryStream(zipBytes))
    {
        // without this I can't open my zip file
        using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Create, true))
        {
        }

        using (var fileStream = new FileStream(path, FileMode.Create))
        {
            memoryStream.Seek(0, SeekOrigin.Begin);
            memoryStream.CopyTo(fileStream);
        }
   }
}

Clarification

The string that I'm decoding is an encoded zip file. I get the Base64 string and I need to decode it and create a zip file that is the same as the original, including the files that were zipped.

Further Clarification

I receive a zip file from a third party. However, I do not receive it as a zip file, I receive it as an encoded Base64 string. The bytes of that zip are encoded to a Base64 string. What I need to do is to recreate that original zip file, using the Base64 string that I received.

My suggestion is to use the ZipFile method CreateFromDirectory

public static void Main(string[] args)
{
    IConfiguration config = new ConfigurationBuilder()
        .AddJsonFile("appsettings.json", false, true)
        .Build();

    var fileName = args[0];
    var path = $"{config["zipPath"]}\\{fileName}";
    string extractPath = @"c:\users\exampleuser\extract";

    byte[] zipBytes = Convert.FromBase64String(args[1]);
    using(var memoryStream = new MemoryStream(zipBytes))
    {
        using (var archive = new ZipArchive(memoryStream, ZipArchiveMode.Read))
        {
            archive.ExtractToDirectory(extractPath);
        }

        ZipFile.CreateFromDirectory(extractPath, path);
   }
}

Base64 Encoding of "zip", Select a file to upload and process, then you can download the encoded result. Change this option if you want to convert it into another one before encoding. Decode Base64 to file using the free online decoder, which allows you to preview files directly in the browser, as well as download them, get the hex dump for any binary data, and get summary information about the original file.

It does not matter at all, what kind of file you are getting, because you receive a binary representation and a filename of it. It can be a .JPG, a .VHD virtual disk, a .MDB database, whatever.

So you can omit the memoryStream and theZipArchive, you simply write the binary data to a file with .zip extension:

  public static void Main(string[] args)
{
    var path = @"c:\temp\fileName2.zip";
    byte[] zipBytes = Convert.FromBase64String("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");
    using (FileStream fs = new FileStream(path, FileMode.Create))
    {
        fs.Write(zipBytes,0,zipBytes.Length);
    }
}

(I created a base64 String from a .zip before)

var path = @"c:\temp\import.zip";
    string base64 = "";

    using (FileStream zip = new FileStream(path, FileMode.Open))
    {
        var zipBytes = new byte[zip.Length];
        zip.Read(zipBytes,0,(int)zip.Length);
        base64 = Convert.ToBase64String(zipBytes);
    }

Downloading and writing a base64 encoded ZIP file, Has anyone had experience of downloading a base64 encoded ZIP file. Instead of doing a split, you'll want to decode the base64 strings with Base64. The concat() method will concatenate byte arrays and return a new byte array. My app receives a ZIP file as a BASE64 encoded text file. It´s just a 80k file with a .db file inside. The file is encoded by a PHP web app using standard functions. I dont´t have access to this server, so I can't change anything. I just receive the file as is. I save this file as zipfile.txt to DirDefaultExternal.

Read all text from the file:

example:

string text = System.IO.File.ReadAllText(@"C:\demofile.txt");

Then turn the base64 string, from the text file, into bytes

example:

byte[] bytes = Convert.FromBase64String(text);

Then you can write those bytes to a zip file

example:

File.WriteAllBytes(@"C:\demofile_zip.zip", bytes);

If you want to extract in memory just load it into a memorystream

example:

using (var compressedStream = new MemoryStream(bytes2))
{
    using (FileStream decompressedFileStream = File.Create(@"C:\demofile_installer.msi"))
    {
        using (GZipStream decompressionStream = new GZipStream(compressedStream, CompressionMode.Decompress))
        {
            decompressionStream.CopyTo(decompressedFileStream);
        }
    }
}

Base64 to File | Base64 Decode | Base64 Converter, Your application says it's a valid base64 string and your character encoding said Hello, I have a string (it is a base 64 zip), I need to convert to zip file, in your 2 ) If the byte array is represented by a string using the API --> new String(byte[],� Base64 Encoding of "zip" Simply enter your data then push the encode button. zip To encode binaries (like images, documents, etc.) use the file upload form a bit further down on this page.

Base64 Decoding of "emlw", DECODE Decodes your data into the textarea below. zip. Decode files from Base64 format. Select a file to upload and process, then you can download the� Base64 encode your data in a hassle-free way, or decode it into human-readable format. Base64 encoding schemes are commonly used when there is a need to encode binary data that needs be stored and transferred over media that are designed to deal with textual data.

loadAsync(data [, options]), Read an existing zip and merge the data in the current JSZip object at the If the JSZip object already contains entries, new entries will be merged. options. base64, boolean, false, set to true if the data is base64 encoded, false for binary. decodeFileName, function, decode from UTF-8, the function to decode the file� – ChrFin May 5 '14 at 12:08 100MB could easily be a problem if you do it again and again – David Heffernan May 5 '14 at 12:11 I have a lot off memory, but RAM increases rapidly when encoding to base64. base64 string I used for saving and sending – user3305198 May 5 '14 at 12:13 After a 32-bit program has been running for a while and got

Base64 Decode File Online, Encode. Base32 � Base32 File � Base64 � Base64 File � HTML � URL. Misc. Syntax Highlight. File Hash. CRC-16 � CRC-32 � MD2 � MD4 � MD5 � SHA1 � SHA224� After encode or decode, you can send the output in a file or print the output in the terminal. Options:-e or –encode. This option is used to encode any data from standard input or from any file. It is the default option.-d or –decode. This option is used to decode any encoded data from standard input or from any file.-n or –noerrcheck

Comments
  • what is in args[1]? the Base64 string? and what is in args[0]???
  • @FalcoAlexander args[0] = the name of the zip file, args[1] = the Base64 string of the encoded zip file
  • I cannot quite follow...you need to create a temp file with the base64 string in it and this file should be in a new .zip file? then you are obviously missing sth.
  • @FalcoAlexander I just need the zip file and I want it to be the same as the original zip file that was encoded to Base64, so including the files in the original zip file
  • Possible duplicate of Base64 decode in C# or Java
  • this seems to create a new entry, what I want is to have the original entries of my original zip file
  • obviously your question is very unclear, see also the other answer? No idea what you try to achieve...
  • yes, strange, but I think I got it. are you sure the Bas64 string you got is correct? your code looks fine for this, even I don't understand the use of ZipArchive in it.
  • The base64 already is a zip. I need to create a zip out of it. I do not get the files it contains seperately