Initial commit with packager implementation

Add AzuresPackager project with .gitignore, solution and project files, core Packager.cs implementation, and sample source files. Implements basic package creation, extraction, and file handling using SharpCompress.

.gitignore

@@ -0,0 +1,59 @@
+## A streamlined .gitignore for modern .NET projects
+## including temporary files, build results, and
+## files generated by popular .NET tools. If you are
+## developing with Visual Studio, the VS .gitignore
+## https://github.com/github/gitignore/blob/main/VisualStudio.gitignore
+## has more thorough IDE-specific entries.
+##
+## Get latest from https://github.com/github/gitignore/blob/main/Dotnet.gitignore
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# ASP.NET Scaffolding
+ScaffoldingReadMe.txt
+
+# NuGet Packages
+*.nupkg
+# NuGet Symbol Packages
+*.snupkg
+
+# dotenv environment variables file
+.env
+
+# Others
+~$*
+*~
+CodeCoverage/
+
+# MSBuild Binary and Structured Log
+*.binlog
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUnit
+*.VisualState.xml
+TestResult.xml
+nunit-*.xml
+
+temp

AzuresPackager.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+	<PropertyGroup>
+		<TargetFramework>net8.0</TargetFramework>
+		<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+		<PackageId>AzuresPackager</PackageId>
+		<Version>1.0.0</Version>
+		<Authors>azures04</Authors>
+		<RepositoryUrl>https://gitea.azures.fr/Azures04/AzuresPackager</RepositoryUrl>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<PackageReference Include="SharpCompress" Version="0.30.0" />
+	</ItemGroup>
+</Project>

AzuresPackager.sln

@@ -0,0 +1,24 @@
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.2.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AzuresPackager", "AzuresPackager.csproj", "{B853400F-35B5-924D-72A5-D2AEEF025774}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B853400F-35B5-924D-72A5-D2AEEF025774}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B853400F-35B5-924D-72A5-D2AEEF025774}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B853400F-35B5-924D-72A5-D2AEEF025774}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B853400F-35B5-924D-72A5-D2AEEF025774}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {AA88177B-51D0-44C0-AFA0-1B34161C75E1}
+	EndGlobalSection
+EndGlobal

Packager.cs

@@ -0,0 +1,112 @@
+using System.IO;
+using System.Text;
+using SharpCompress.Archives;
+using SharpCompress.Common;
+using SharpCompress.Writers;
+using System.Collections.Generic;
+using System.Linq;
+using System;
+
+namespace AzuresPackager;
+
+public class AzuresPackage : IDisposable {
+    private readonly byte[] _data;
+    private readonly byte _key;
+
+    public AzuresPackage(string filePath, byte key) {
+        _key = key;
+        _data = File.ReadAllBytes(filePath);
+        Decode();
+    }
+
+    private void Decode() {
+        for (int i = 0; i < _data.Length; i++) {
+            _data[i] = (byte)(_data[i] ^ _key);
+        }
+    }
+
+    public List<string> ListEntries() {
+        using var ms = new MemoryStream(_data);
+        using var archive = ArchiveFactory.Open(ms);
+        return archive.Entries.Select(e => e.Key!).ToList();
+    }
+
+    public string GetFileContent(string internalPath) {
+        using var ms = new MemoryStream(_data);
+        using var archive = ArchiveFactory.Open(ms);
+        var entry = archive.Entries.FirstOrDefault(e => e.Key == internalPath);
+        
+        if (entry == null || entry.IsDirectory) return string.Empty;
+
+        using var entryStream = entry.OpenEntryStream();
+        using var reader = new StreamReader(entryStream, Encoding.UTF8);
+        return reader.ReadToEnd();
+    }
+
+    public byte[] GetFileBytes(string internalPath) {
+        using var ms = new MemoryStream(_data);
+        using var archive = ArchiveFactory.Open(ms);
+        var entry = archive.Entries.FirstOrDefault(e => e.Key == internalPath);
+        
+        if (entry == null) return Array.Empty<byte>();
+
+        using var entryStream = entry.OpenEntryStream();
+        using var outMs = new MemoryStream();
+        entryStream.CopyTo(outMs);
+        return outMs.ToArray();
+    }
+
+    public void Unpack(string targetDirectory) {
+        if (!Directory.Exists(targetDirectory)) Directory.CreateDirectory(targetDirectory);
+
+        using var ms = new MemoryStream(_data);
+        using var archive = ArchiveFactory.Open(ms);
+        foreach (var entry in archive.Entries.Where(e => !e.IsDirectory)) {
+            entry.WriteToDirectory(targetDirectory, new ExtractionOptions {
+                ExtractFullPath = true,
+                Overwrite = true
+            });
+        }
+    }
+
+    public void Dispose() {
+        Array.Clear(_data, 0, _data.Length);
+    }
+}
+
+public static class Packager {
+    public static void Pack(string sourceFolder, string outputPath, byte key) {
+        using var memoryStream = new MemoryStream();
+        var writerOptions = new WriterOptions(CompressionType.LZMA); 
+        
+        using (var writer = WriterFactory.Open(memoryStream, ArchiveType.Zip, writerOptions)) {
+            writer.WriteAll(sourceFolder, "*", SearchOption.AllDirectories);
+        }
+
+        byte[] data = memoryStream.ToArray();
+
+        for (int i = 0; i < data.Length; i++) {
+            data[i] = (byte)(data[i] ^ key);
+        }
+
+        File.WriteAllBytes(outputPath, data);
+    }
+}
+
+public static class MimeHelper {
+    public static string GetMimeType(string path) {
+        string extension = Path.GetExtension(path).ToLower();
+        return extension switch
+        {
+            ".html" or ".htm" => "text/html",
+            ".css"            => "text/css",
+            ".js"             => "text/javascript",
+            ".png"            => "image/png",
+            ".jpg" or ".jpeg" => "image/jpeg",
+            ".svg"            => "image/svg+xml",
+            ".woff2"          => "font/woff2",
+            ".json"           => "application/json",
+            _                 => "application/octet-stream",
+        };
+    }
+}