Stackalloc for int reads

Author: pl752

src/FirebirdSql.Data.FirebirdClient/Client/Managed/XdrReaderWriter.cs

@@ -269,8 +269,9 @@ public async ValueTask<short> ReadInt16Async(CancellationToken cancellationToken
 
 	public int ReadInt32()
 	{
-		ReadBytes(_smallBuffer, 4);
-		return TypeDecoder.DecodeInt32(_smallBuffer);
+		Span<byte> bytes = stackalloc byte[4];
+		ReadBytes(bytes, 4);
+		return TypeDecoder.DecodeInt32(bytes);
 	}
 	public async ValueTask<int> ReadInt32Async(CancellationToken cancellationToken = default)
 	{
@@ -280,8 +281,9 @@ public async ValueTask<int> ReadInt32Async(CancellationToken cancellationToken =
 
 	public long ReadInt64()
 	{
-		ReadBytes(_smallBuffer, 8);
-		return TypeDecoder.DecodeInt64(_smallBuffer);
+		Span<byte> bytes = stackalloc byte[8];
+		ReadBytes(bytes, 8);
+		return TypeDecoder.DecodeInt64(bytes);
 	}
 	public async ValueTask<long> ReadInt64Async(CancellationToken cancellationToken = default)
 	{

src/FirebirdSql.Data.FirebirdClient/Common/TypeDecoder.cs

@@ -124,11 +124,19 @@ public static int DecodeInt32(byte[] value)
 		return IPAddress.HostToNetworkOrder(BitConverter.ToInt32(value, 0));
 	}
 
+	public static int DecodeInt32(Span<byte> value) {
+		return IPAddress.HostToNetworkOrder(BitConverter.ToInt32(value));
+	}
+
 	public static long DecodeInt64(byte[] value)
 	{
 		return IPAddress.HostToNetworkOrder(BitConverter.ToInt64(value, 0));
 	}
 
+	public static long DecodeInt64(Span<byte> value) {
+		return IPAddress.HostToNetworkOrder(BitConverter.ToInt64(value));
+	}
+
 	public static FbDecFloat DecodeDec16(byte[] value)
 	{
 		if (BitConverter.IsLittleEndian)