Initial commit

HyperbolicDowloader/FileProcessing/FileCompressor.cs

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+using System.IO.Compression;
+
+namespace HyperbolicDowloader.FileProcessing;
+
+internal class FileCompressor
+{
+    private static void CompressFile(string inputFilePath, string compressedFilePath)
+    {
+        using FileStream originalFileStream = File.Open(inputFilePath, FileMode.Open);
+        using FileStream compressedFileStream = File.Create(compressedFilePath);
+        using GZipStream? compressor = new GZipStream(compressedFileStream, CompressionMode.Compress);
+        originalFileStream.CopyTo(compressor);
+    }
+
+    private static void DecompressFile(string compressedFilePath, string outputFilePath)
+    {
+        using FileStream compressedFileStream = File.Open(compressedFilePath, FileMode.Open);
+        using FileStream outputFileStream = File.Create(outputFilePath);
+        using GZipStream? decompressor = new GZipStream(compressedFileStream, CompressionMode.Decompress);
+        decompressor.CopyTo(outputFileStream);
+    }
+}

HyperbolicDowloader/FileProcessing/FileValidator.cs

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+using System.Security.Cryptography;
+
+namespace HyperbolicDowloader.FileProcessing;
+
+internal class FileValidator
+{
+    public static async Task<string> CalculateHashAsync(string filePath)
+    {
+        using SHA512 sha = SHA512.Create();
+        using FileStream? stream = File.OpenRead(filePath);
+        byte[]? hash = await sha.ComputeHashAsync(stream);
+        return BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
+    }
+
+    public static async Task<bool> ValidateHashAsync(string filePath, string hash)
+    {
+        return await CalculateHashAsync(filePath) == hash;
+    }
+}