chaokunyang commented on code in PR #2004:
URL: https://github.com/apache/fory/pull/2004#discussion_r2139208645
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csharp/Fury/Serialization/Meta/HeaderSerializer.cs:
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@@ -0,0 +1,163 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Threading;
+using System.Threading.Tasks;
+using Fury.Context;
+using Fury.Meta;
+
+namespace Fury.Serialization.Meta;
+
+[Flags]
+file enum HeaderFlag : byte
+{
+ NullRootObject = 1,
+ LittleEndian = 1 << 1,
+ CrossLanguage = 1 << 2,
+ OutOfBand = 1 << 3,
+}
+
+file static class HeaderHelper
+{
+ public const short MagicNumber = 0x62D4;
+}
+
+internal sealed class HeaderSerializer
+{
+ private bool _hasWrittenMagicNumber;
+ private bool _hasWrittenHeaderFlag;
+ private bool _hasWrittenLanguage;
+
+ public void Reset()
+ {
+ _hasWrittenMagicNumber = false;
+ _hasWrittenHeaderFlag = false;
+ _hasWrittenLanguage = false;
+ }
+
+ public bool Write(ref SerializationWriterRef writerRef, bool
rootObjectIsNull)
+ {
+ if (!_hasWrittenMagicNumber)
+ {
+ _hasWrittenMagicNumber =
writerRef.WriteInt16(HeaderHelper.MagicNumber);
+ if (!_hasWrittenMagicNumber)
+ {
+ return false;
+ }
+ }
+
+ if (!_hasWrittenHeaderFlag)
+ {
+ var flag = HeaderFlag.LittleEndian | HeaderFlag.CrossLanguage;
+ if (rootObjectIsNull)
+ {
+ flag |= HeaderFlag.NullRootObject;
+ }
+
+ _hasWrittenHeaderFlag = writerRef.WriteUInt8((byte)flag);
+ if (!_hasWrittenMagicNumber)
Review Comment:
```suggestion
if (!_hasWrittenHeaderFlag)
```
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