How to Rename Files and Folder in .rar .7z, .tar, .zip using C#

Question

I have a compressed file .rar .7z, .tar and .zip and I want to rename physical file name available in above compressed archived using C#.

I have tried this using a sharpcompress library but I can't find such a feature for rename file or folder name within .rar .7z, .tar and .zip file.

I also have tried using the DotNetZip library but its only support.Zip see what I have tried using DotNetZip library.

private static void RenameZipEntries(string file)
        {
            try
            {
                int renameCount = 0;
                using (ZipFile zip2 = ZipFile.Read(file))
                {

                    foreach (ZipEntry e in zip2.ToList())
                    {
                        if (!e.IsDirectory)
                        {
                            if (e.FileName.EndsWith(".txt"))
                            {
                                var newname = e.FileName.Split('.')[0] + "_new." + e.FileName.Split('.')[1];
                                e.FileName = newname;
                                e.Comment = "renamed";
                                zip2.Save();
                                renameCount++;
                            }
                        }
                    }
                    zip2.Comment = String.Format("This archive has been modified. {0} files have been renamed.", renameCount);
                    zip2.Save();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }

        }

But actually the same as above I also want for .7z, .rar and .tar, I tried many libraries but still I didn't get any accurate solution.

Please help me.

Answer 1

Consider 7zipsharp:

https://www.nuget.org/packages/SevenZipSharp.Net45/

7zip itself supports lots of archive formats (I believe all you mentioned) and 7zipsharp uses the real 7zip. I've used 7zipsharp for .7z files only but I bet it works for others.

Here's a sample of a test that appears to rename a file using ModifyArchive method, I suggest you go to school in it:

https://github.com/squid-box/SevenZipSharp/blob/f2bee350e997b0f4b1258dff520f36409198f006/SevenZip.Tests/SevenZipCompressorTests.cs

Here's the code simplified a bit. Note that the test compresses a 7z file for its test; that's immaterial it could be .txt, etc. Also note it finds the file by index in the dictionary passed to ModifyArchive. Consult documentation for how to get that index from a filename (maybe you have to loop and compare).

var compressor = new SevenZipCompressor( ... snip ...);

compressor.CompressFiles("tmp.7z", @"Testdata\7z_LZMA2.7z");

compressor.ModifyArchive("tmp.7z", new Dictionary<int, string> { { 0, "renamed.7z" }});

using (var extractor = new SevenZipExtractor("tmp.7z"))
{
    Assert.AreEqual(1, extractor.FilesCount);
    extractor.ExtractArchive(OutputDirectory);
}

Assert.IsTrue(File.Exists(Path.Combine(OutputDirectory, "renamed.7z")));
Assert.IsFalse(File.Exists(Path.Combine(OutputDirectory, "7z_LZMA2.7z")));

Answer 2

This is a simple console application to rename files in .zip

using System;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Text;

namespace Renamer
{
    class Program
    {
        static void Main(string[] args)
        {
            using var archive = new ZipArchive(File.Open(@"<Your File>.zip", FileMode.Open, FileAccess.ReadWrite), ZipArchiveMode.Update);
            var entries = archive.Entries.ToArray();

            //foreach (ZipArchiveEntry entry in entries)
            //{
            //    //If ZipArchiveEntry is a directory it will have its FullName property ending with "/" (e.g. "some_dir/") 
            //    //and its Name property will be empty string ("").
            //    if (!string.IsNullOrEmpty(entry.Name))
            //    {
            //        var newEntry = archive.CreateEntry($"{entry.FullName.Replace(entry.Name, $"{RandomString(10, false)}{Path.GetExtension(entry.Name)}")}");
            //        using (var a = entry.Open())
            //        using (var b = newEntry.Open())
            //            a.CopyTo(b);
            //        entry.Delete();
            //    }
            //}

            Parallel.ForEach(entries, entry =>
            {
                //If ZipArchiveEntry is a directory it will have its FullName property ending with "/" (e.g. "some_dir/") 
                //and its Name property will be empty string ("").
                if (!string.IsNullOrEmpty(entry.Name))
                {
                    ZipArchiveEntry newEntry = archive.CreateEntry($"{entry.FullName.Replace(entry.Name, $"{RandomString(10, false)}{Path.GetExtension(entry.Name)}")}");
                    using (var a = entry.Open())
                    using (var b = newEntry.Open())
                        a.CopyTo(b);
                    entry.Delete();
                }
            });
        }

        //To Generate random name for the file
        public static string RandomString(int size, bool lowerCase)
        {
            StringBuilder builder = new StringBuilder();
            Random random = new Random();
            char ch;
            for (int i = 0; i < size; i++)
            {
                ch = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * random.NextDouble() + 65)));
                builder.Append(ch);
            }
            if (lowerCase)
                return builder.ToString().ToLower();
            return builder.ToString();
        }
    }
}