feat(batch15): complete group 1 msgblock/consumerfilestore

dotnet/src/ZB.MOM.NatsNet.Server/JetStream/StoreEnumExtensions.cs

@@ -0,0 +1,54 @@
+using System.Text.Json;
+
+namespace ZB.MOM.NatsNet.Server;
+
+/// <summary>
+/// String/JSON helpers for store enums that mirror Go enum methods.
+/// </summary>
+public static class StoreEnumExtensions
+{
+    public static string String(this StoreCipher cipher)
+        => cipher switch
+        {
+            StoreCipher.ChaCha => "ChaCha20-Poly1305",
+            StoreCipher.Aes => "AES-GCM",
+            StoreCipher.NoCipher => "None",
+            _ => "Unknown StoreCipher",
+        };
+
+    public static string String(this StoreCompression alg)
+        => alg switch
+        {
+            StoreCompression.NoCompression => "None",
+            StoreCompression.S2Compression => "S2",
+            _ => "Unknown StoreCompression",
+        };
+
+    public static byte[] MarshalJSON(this StoreCompression alg)
+        => alg switch
+        {
+            StoreCompression.NoCompression => JsonSerializer.SerializeToUtf8Bytes("none"),
+            StoreCompression.S2Compression => JsonSerializer.SerializeToUtf8Bytes("s2"),
+            _ => throw new InvalidOperationException("unknown compression algorithm"),
+        };
+
+    public static void UnmarshalJSON(this ref StoreCompression alg, ReadOnlySpan<byte> b)
+    {
+        var parsed = JsonSerializer.Deserialize<string>(b);
+        if (parsed == null)
+            throw new InvalidDataException("compression value must be a JSON string");
+
+        alg = parsed switch
+        {
+            "none" => StoreCompression.NoCompression,
+            "s2" => StoreCompression.S2Compression,
+            _ => throw new InvalidOperationException("unknown compression algorithm"),
+        };
+    }
+
+    public static void UnmarshalJSON(this ref StoreCompression alg, byte[] b)
+    {
+        ArgumentNullException.ThrowIfNull(b);
+        UnmarshalJSON(ref alg, b.AsSpan());
+    }
+}