Brotli compression and decompression

brotli-app.cs

using System;
using System.IO;
using System.IO.Compression;
using System.Net.Http;
using System.Threading.Tasks;
using static System.Console;

namespace BrotliApp
{
    class Program
    {
        static readonly string s_URL = "https://raw.githubusercontent.com/dotnet/core/master/README.md";
        static async Task Main(string[] args)
        {
            var client = new HttpClient();
            var response = await client.GetAsync(s_URL,HttpCompletionOption.ResponseHeadersRead);
            var stream = await response.Content.ReadAsStreamAsync();

            WriteLine($"Request URL: {s_URL}");
            WriteLine($"Initial content length: {response.Content.Headers.ContentLength}");
            var compressedStream = CompressWithBrotli(stream);
            WriteLine($"Compressed content length: {compressedStream.Length}");
            var decompressedStream = DecompressWithBrotli(compressedStream);
            WriteLine($"Decompressed content length: {decompressedStream.Length}");
            WriteLine($"Compression ratio: {100 - (Decimal.Divide(compressedStream.Length, response.Content.Headers.ContentLength.Value)*100):N1}%");
            WriteLine("First 10 lines of decompressed content");
            WriteLine();

            var reader = new StreamReader(decompressedStream);
            for (var i = 0; i < 10; i++)
            {
                WriteLine(reader.ReadLine());
            }
        }

        public static Stream CompressWithBrotli(Stream toCompress)
        {
            MemoryStream compressedStream = new MemoryStream();
            using (BrotliStream compressionStream = new BrotliStream(compressedStream, CompressionMode.Compress, leaveOpen: true))
            {
                toCompress.CopyTo(compressionStream);
            }
            compressedStream.Position = 0;
            return compressedStream;
        }

        public static Stream DecompressWithBrotli(Stream toDecompress)
        {
            MemoryStream decompressedStream = new MemoryStream();
            using (BrotliStream decompressionStream = new BrotliStream(toDecompress, CompressionMode.Decompress, leaveOpen: true))
            {
                decompressionStream.CopyTo(decompressedStream);
            }
            decompressedStream.Position = 0;
            return decompressedStream;
        }
    }
}

This code will produce the following output:

Request URL: https://raw.githubusercontent.com/dotnet/core/master/README.md
Initial content length: 2244
Compressed content length: 727
Decompressed content length: 2244
Compression ratio: 67.6%
First 10 lines of decompressed content

# .NET Core Home

The dotnet/core repository is a good starting point for .NET Core.

The latest major release is [.NET Core 2.1](release-notes/2.1/2.1.0.md). The latest patch updates are listed in [.NET Core release notes](release-notes/README.md)

## Download the latest .NET Core SDK

* [.NET Core 2.1 SDK](release-notes/download-archives/2.1.0-download.md)