using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

using System.Reflection;

using System.IO.Compression;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

using NUnit.Framework; // Throws NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/32943899/can-i-decompress-and-deserialize-a-file-using-streams

​

    public static partial class JsonExtensions

    {

        // Buffer sized as recommended by Bradley Grainger, https://faithlife.codes/blog/2012/06/always-wrap-gzipstream-with-bufferedstream/

        // But anything smaller than 85,000 bytes should be OK, since objects larger than that go on the large object heap.  See:

        // https://docs.microsoft.com/en-us/dotnet/standard/garbage-collection/large-object-heap

        const int BufferSize = 8192;

        // Disable writing of BOM as per https://datatracker.ietf.org/doc/html/rfc8259#section-8.1

        static readonly Encoding DefaultEncoding = new UTF8Encoding(false);

​

        public static void SerializeToFileCompressed(object value, string path, JsonSerializerSettings settings = null)

        {

            using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read))

                SerializeCompressed(value, fs, settings);

        }

​

        public static void SerializeCompressed(object value, Stream stream, JsonSerializerSettings settings = null)

        {

            using (var compressor = new GZipStream(stream, CompressionMode.Compress))

            using (var writer = new StreamWriter(compressor, DefaultEncoding, BufferSize))

            {

                var serializer = JsonSerializer.CreateDefault(settings);

                serializer.Serialize(writer, value);

            }

        }

​

        public static T DeserializeFromFileCompressed<T>(string path, JsonSerializerSettings settings = null)

        {

            using (var fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))

                return DeserializeCompressed<T>(fs, settings);

        }

​

        public static T DeserializeCompressed<T>(Stream stream, JsonSerializerSettings settings = null)

        {

            using (var compressor = new GZipStream(stream, CompressionMode.Decompress))

            using (var reader = new StreamReader(compressor))

            using (var jsonReader = new JsonTextReader(reader))

            {

                var serializer = JsonSerializer.CreateDefault(settings);

                return serializer.Deserialize<T>(jsonReader);

            }

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

        }   

        static string GetJson()

        {

            return @"

";

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: " + Environment.Version);

            Console.WriteLine("{0} version: {1}", typeof(JsonSerializer).Namespace, typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​