fix: ArgumentException when a duplicated manifest file is in a jar file

Author: AlphaBs

CmlLib.Core.Installer.Forge/CmlLib.Core.Installer.Forge.csproj

@@ -9,7 +9,7 @@
     </PropertyGroup>
 
     <PropertyGroup>
-        <Version>0.0.2</Version>
+        <Version>0.0.3</Version>
         <Description>Minecraft Forge Installer</Description>
         <Copyright>Copyright (c) 2023 CmlLib</Copyright>
         <PackageProjectUrl>https://github.com/CmlLib/CmlLib.Core.Installer.Forge</PackageProjectUrl>

CmlLib.Core.Installer.Forge/JarFile.cs

@@ -0,0 +1,75 @@
+using ICSharpCode.SharpZipLib.Zip;
+using System.Text;
+
+namespace CmlLib.Core.Installer.Forge;
+
+public class JarFile
+{
+    public JarFile(string path)
+    {
+        this.Path = path;
+    }
+
+    public string Path { get; private set; }
+
+    public Dictionary<string, string?>? GetManifest()
+    {
+        string? manifest = null;
+
+        using (var fs = File.OpenRead(Path))
+        using (var s = new ZipInputStream(fs))
+        {
+            ZipEntry e;
+            while ((e = s.GetNextEntry()) != null)
+            {
+                if (e.Name == "META-INF/MANIFEST.MF")
+                {
+                    manifest = readStreamString(s);
+                    break;
+                }
+            }
+        }
+
+        if (string.IsNullOrEmpty(manifest))
+            return null;
+
+        var dict = new Dictionary<string, string?>();
+        foreach (var item in manifest.Split('\n'))
+        {
+            if (string.IsNullOrWhiteSpace(item))
+                continue;
+
+            var split = item.Split(':');
+
+            var key = split[0].Trim();
+
+            if (split.Length == 1)
+                dict[key] = null;
+            else if (split.Length == 2)
+                dict[key] = split[1].Trim();
+            else
+            {
+                var value = string.Join(":", split, 1, split.Length - 1).Trim();
+                dict[key] = value;
+            }
+        }
+
+        return dict;
+    }
+
+    private static string readStreamString(Stream s)
+    {
+        var str = new StringBuilder();
+        var buffer = new byte[1024];
+        while (true)
+        {
+            int size = s.Read(buffer, 0, buffer.Length);
+            if (size == 0)
+                break;
+
+            str.Append(Encoding.UTF8.GetString(buffer, 0, size));
+        }
+
+        return str.ToString();
+    }
+}