Version: 2.0.0_Beta This is the second major release of LittlePack, upgraded from .NET 4.0 to .NET 8.0 and rebuilt with full CLI support, encryption, pattern filtering, and test coverage.

LittlePack is a lightweight C# library for packing and unpacking collections of files into a single compressed byte array. It supports GZip compression, relative file path preservation, optional AES encryption, and filtering via wildcards. This library is ideal for bundling files for transport, backup, or use in custom archival formats.

• Pack and unpack collections of files using a simple Record model
• Preserves folder structure using relative paths
• Uses GZip for compression
• Optional AES encryption using a password
• Supports file filtering via --ignore, --only, and .littlepackignore patterns
• Designed for integration into CLI or backend tools

var files = Directory.GetFiles("./input", "*", SearchOption.AllDirectories);
var records = files.Select(f => new Record(
    Path.GetRelativePath("./input", f),
    File.ReadAllBytes(f))
).ToList();

var packer = new Packer(records);
var packedBytes = packer.Pack();
File.WriteAllBytes("archive.lpkg", packedBytes);

var packer = new Packer();

packer.Records.Add(new Record { FileName = "file1.png", Data = File.ReadAllBytes(@"C:\\Data\\file1.png") });
packer.Records.Add(new Record { FileName = "file2.png", Data = File.ReadAllBytes(@"C:\\Data\\file2.png") });
packer.Records.Add(new Record { FileName = "file3.png", Data = File.ReadAllBytes(@"C:\\Data\\file3.png") });

byte[] package = packer.Pack();
File.WriteAllBytes(@"C:\\Temp\\package.pack", package);

var packedBytes = File.ReadAllBytes("archive.lpkg");
var records = Packer.Unpack(packedBytes);
records.SaveTo("./output");

// Encrypt
var encrypted = CryptoUtility.Encrypt(packedBytes, "MyPassword");
File.WriteAllBytes("secure.lpkg", encrypted);

// Decrypt
var decrypted = CryptoUtility.Decrypt(File.ReadAllBytes("secure.lpkg"), "MyPassword");
var records = Packer.Unpack(decrypted);

Unit tests are included for:

• Encryption and decryption round-trips
• Packing/unpacking byte-level consistency
• CLI argument parsing and pattern filtering

To run tests:

dotnet test

• Record.cs - Represents a file (name + data)
• Packer.cs - Handles pack/unpack logic with compression
• CryptoUtility.cs - AES encryption and decryption helpers
• LittlePackExtensions.cs - File saving helpers
• CliParser.cs - CLI argument parsing and .littlepackignore support
• LittlePackCli.cs - Main runner for CLI mode

MIT License. Use it, fork it, break it, fix it — enjoy.