YGZipLib

YGZipLib is a compression/decompression library for ZIP archives.

Features

Compression/decompression processes are performed in multiprocessing
AES encryption support
Easy to use

Usage

• Compression method

using YGZipLib; public void Compress() { // // Instances should be Disposed. using(ZipArcClass zip = new ZipArcClass(@"R:\example.zip")) { // Compression Option Setting zip.EncryptionOption = ZipArcClass.ENCRYPTION_OPTION.AES256; zip.Password = "password"; // single file compression zip.AddFilePath(@"R:\example_file.txt"); // directory compression zip.AddDirectory(@"R:\example_dir"); // Finish call zip.Finish(); } }

• Decompression Method

using YGZipLib; using System.Collections.Generic; using System.IO; public void Decompress() { // Instances should be Disposed. using(UnZipArcClass unzip = new UnZipArcClass(@"R:\example.zip")) { // Set password if the file is encrypted. unzip.Password = "password"; // --- Processed per file --- // Obtaining a list of files in a ZIP archive List<UnZipArcClass.CentralDirectoryInfo> dirList = unzip.GetFileList; // Loop and process dirList.FindAll(d => d.IsDirectory == false).ForEach(d => unzip.PutFile(d, Path.Combine(@"R:\uncompressdir", d.FileName))); // --- batch directory processing --- unzip.ExtractAllFiles(new DirectoryInfo(@"R:\uncompressdir")); } }

• Output ZIP file as Stream by web service, etc.

using YGZipLib; using System.IO; /// <summary> /// Example of sending a ZIP file via a web service, etc. /// </summary> /// <param name="resStream"></param> public async void SendZipFile (Stream resStream) { // Instances should be Disposed. using(ZipArcClass zip = new ZipArcClass(resStream)) { await zip.AddFileStreamAsync("example1.dat", stream1); await zip.AddFileStreamAsync("/dir/example2.dat", stream2); await zip.FinishAsync(); } }

• Async

// Example List<Task> taskList = new List<Task>(); taskList.Add(zip.AddFilePathAsync(@"D:\example1.txt")); taskList.Add(zip.AddFilePathAsync(@"D:\example2.txt")); taskList.Add(zip.AddFilePathAsync(@"D:\example3.txt")); Task t = Task.WhenAll(taskList);

• Other Settings

ZipArcClass

// Processing multiplicity and working directory // ProcessorCount or 4, whichever is smaller. 0 is the default value. // For slow storage, process multiplexing should be lowered. // The working directory should be a fast device; if null is specified, it is automatically set from the environment. YGZipLib.ZipArcClass zip = new ZipArcClass(@"D:\zipfile.zip", 8, @"R:\temp"); // Only archive without compression zip.CompressionOption = ZipArcClass.COMPRESSION_OPTION.NOT_COMPRESSED; // If you want the file to be uncompressed, specify the extension with a regular expression. zip.DontCompressExtRegExList.Add(new Regex("jpg", RegexOptions.IgnoreCase)); zip.DontCompressExtRegExList.Add(new Regex("xls.*", RegexOptions.IgnoreCase)); // Encryption Algorithms zip.EncryptionOption = ZipArcClass.ENCRYPTION_OPTION.TRADITIONAL; // default zip.EncryptionOption = ZipArcClass.ENCRYPTION_OPTION.AES256; // AES 256bit // Encoding of store file name and password. // The default is System.Globalization.CultureInfo.CurrentUICulture.TextInfo.ANSICodePage // See Note zip.ZipFileNameEncoding = System.Text.Encoding.GetEncoding("shift-jis");

Note on ZipFileNameEncoding
For non- NET Framework environments (e.g., .net Core, .net5 or later), only ascii and utf are available unless CodePagesEncodingProvider is registered.
Reference Site https://learn.microsoft.com/ja-jp/dotnet/api/system.text.codepagesencodingprovider
If CodePagesEncodingProvider is not registered and the OS language does not support Encoding, the file name is stored in UTF-8.

// CodePagesEncodingProvider Registration // Register once at the start of the program Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

UnZipArcClass

// Get list of stored files. List<YGZipLib.UnZipArcClass.CentralDirectoryInfo> dirList = unzip.GetFileList; // Processing multiplicity and working directory // See ZipArcClass YGZipLib.UnZipArcClass unzip = new UnZipArcClass(@"D:\zipfile.zip", 4, @"R:\temp"); // TextEncodings of stored files. // See ZipArcClass unzip.ZipFileNameEncoding = System.Text.Encoding.GetEncoding("shift-jis");

Note

Finish should be called at the end when creating a ZIP archive.

License

"YGZipLib" is under MIT license

This library includes the work that is distributed in the Apache License 2.0.
The Deflate64 code included in YGZipLib is based on the following java source from Apache Commons Compress™.