Improve string serialization and buffer preallocation

- Add VarUIntSize and unsafe VarUInt writers for efficient buffer sizing and writing without redundant checks.
- Update WriteStringUtf8 to preallocate for VarUInt and string body in one step, reducing reallocations and risk of overflow.
- Change ArrayBinaryOutput default initial capacity to 65535.
- Use BufferWriterChunkSize from options in AcBinarySerializer.
- Fix typo in AcBinarySerializerOptions.
- Set SignalR client log level to Warning by default.

AyCode.Core/Serializers/Binaries/AcBinarySerializer.BinarySerializationContext.cs

@@ -493,6 +493,16 @@ public static partial class AcBinarySerializer
             _buffer[_position++] = (byte)value;
         }
 
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static int VarUIntSize(uint value)
+        {
+            if (value < 0x80) return 1;
+            if (value < 0x4000) return 2;
+            if (value < 0x200000) return 3;
+            if (value < 0x10000000) return 4;
+            return 5;
+        }
+
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public void WriteVarInt(int value)
         {
@@ -651,28 +661,23 @@ public static partial class AcBinarySerializer
 
             var charLength = value.Length;
 
-            // Speculative ASCII fast path: assume byteCount == charLength
-            // Single-pass Ascii.FromUtf16 (scan+copy combined) instead of
-            // Ascii.IsValid (scan) + Ascii.FromUtf16 (scan+copy) = double traversal
+            // Pre-allocate VarUInt + ASCII body BEFORE savedPosition — if Grow happens,
+            // it fires here, before the save. savedPosition is always in the current chunk.
+            EnsureCapacity(VarUIntSize((uint)charLength) + charLength);
             var savedPosition = _position;
 
-            WriteVarUInt((uint)charLength);
-            EnsureCapacity(charLength);
-
+            WriteVarUIntUnsafe((uint)charLength);
             if (Ascii.FromUtf16(value.AsSpan(), _buffer.AsSpan(_position, charLength), out _) == OperationStatus.Done)
             {
                 _position += charLength;
                 return;
             }
 
-            // Non-ASCII fallback: rewind VarUInt, encode with UTF-8
-            // FromUtf16 fails fast on first non-ASCII char, so speculative cost is minimal
+            // Non-ASCII fallback: safe rewind (no Grow happened since pre-allocate)
             _position = savedPosition;
             var byteCount = Utf8NoBom.GetByteCount(value);
-
-            WriteVarUInt((uint)byteCount);
-            EnsureCapacity(byteCount);
-
+            EnsureCapacity(VarUIntSize((uint)byteCount) + byteCount);
+            WriteVarUIntUnsafe((uint)byteCount);
             Utf8NoBom.GetBytes(value.AsSpan(), _buffer.AsSpan(_position, byteCount));
             _position += byteCount;
         }

AyCode.Core/Serializers/Binaries/AcBinarySerializer.cs

@@ -80,7 +80,7 @@ public static partial class AcBinarySerializer
 
         // Create context without pooling (we need to set up callback)
         using var context = new BinarySerializationContext<ArrayBinaryOutput>(analysisOptions);
-        context.Output = new ArrayBinaryOutput(4096);
+        context.Output = new ArrayBinaryOutput(options.BufferWriterChunkSize);
         context.OutputInitialized = true;
         context.Output.Initialize(out context._buffer, out context._position, out context._bufferEnd);
 

AyCode.Core/Serializers/Binaries/AcBinarySerializerOptions.cs

@@ -128,7 +128,7 @@ public sealed class AcBinarySerializerOptions : AcSerializerOptions
     /// Initial capacity for serialization buffer.
     /// Default: 4096 bytes
     /// </summary>
-    public int InitialBufferCapacity { get; init; } = 4096;
+    public int InitialBufferCapacity { get; init; } = 4096;d
 
     /// <summary>
     /// Chunk size (in bytes) used by <see cref="BufferWriterBinaryOutput"/> when writing to an <see cref="System.Buffers.IBufferWriter{T}"/>.

AyCode.Core/Serializers/Binaries/ArrayBinaryOutput.cs

@@ -19,7 +19,7 @@ public struct ArrayBinaryOutput : IBinaryOutputBase, IDisposable
     private readonly int _initialCapacity;
     private byte[] _rentedBuffer;
 
-    public ArrayBinaryOutput(int initialCapacity = 4096)
+    public ArrayBinaryOutput(int initialCapacity = 65535)
     {
         _initialCapacity = Math.Max(initialCapacity, DefaultMinBufferSize);
         _rentedBuffer = ArrayPool<byte>.Shared.Rent(_initialCapacity);

AyCode.Core/Serializers/Binaries/BufferWriterBinaryOutput.cs

@@ -206,6 +206,24 @@ public struct BufferWriterBinaryOutput : IBinaryOutputBase
             return;
         }
         StandaloneEnsureCapacity(5);
+        WriteVarUIntMultiByteUnsafe(value);
+    }
+
+    /// <summary>Writes VarUInt without bounds check. Caller must ensure sufficient space.</summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void WriteVarUIntUnsafe(uint value)
+    {
+        if (value < 0x80)
+        {
+            _buffer[_position++] = (byte)value;
+            return;
+        }
+        WriteVarUIntMultiByteUnsafe(value);
+    }
+
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    private void WriteVarUIntMultiByteUnsafe(uint value)
+    {
         while (value >= 0x80)
         {
             _buffer[_position++] = (byte)(value | 0x80);
@@ -214,26 +232,37 @@ public struct BufferWriterBinaryOutput : IBinaryOutputBase
         _buffer[_position++] = (byte)value;
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private static int VarUIntSize(uint value)
+    {
+        if (value < 0x80) return 1;
+        if (value < 0x4000) return 2;
+        if (value < 0x200000) return 3;
+        if (value < 0x10000000) return 4;
+        return 5;
+    }
+
     public void WriteStringUtf8(string value)
     {
         var charLength = value.Length;
 
-        // Speculative ASCII fast path: single-pass Ascii.FromUtf16
+        // Pre-allocate VarUInt + ASCII body BEFORE savedPosition — if Grow happens,
+        // it fires here, before the save. savedPosition is always in the current chunk.
+        StandaloneEnsureCapacity(VarUIntSize((uint)charLength) + charLength);
         var savedPosition = _position;
-        WriteVarUInt((uint)charLength);
-        StandaloneEnsureCapacity(charLength);
 
+        WriteVarUIntUnsafe((uint)charLength);
         if (Ascii.FromUtf16(value.AsSpan(), _buffer.AsSpan(_position, charLength), out _) == OperationStatus.Done)
         {
             _position += charLength;
             return;
         }
 
-        // Non-ASCII fallback: rewind VarUInt, encode with UTF-8
+        // Non-ASCII fallback: safe rewind (no Grow happened since pre-allocate)
         _position = savedPosition;
         var byteCount = Utf8NoBom.GetByteCount(value);
-        WriteVarUInt((uint)byteCount);
-        StandaloneEnsureCapacity(byteCount);
+        StandaloneEnsureCapacity(VarUIntSize((uint)byteCount) + byteCount);
+        WriteVarUIntUnsafe((uint)byteCount);
         Utf8NoBom.GetBytes(value.AsSpan(), _buffer.AsSpan(_position, byteCount));
         _position += byteCount;
     }

AyCode.Services/SignalRs/AcSignalRClientBase.cs

@@ -54,7 +54,7 @@ namespace AyCode.Services.SignalRs
                 .ConfigureLogging(logging =>
                 {
                     // alap minimális MS log level
-                    logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Debug);
+                    logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Warning);
 
                     // regisztráljuk az AcLoggerProvider-t úgy, hogy visszaadja a meglévő Logger példányt
                     logging.AddAcLogger(_ => Logger);