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Tools/ConfigBuilder/NBConfigBuilder/Core/MemoryStreamBuffer.cs

@@ -0,0 +1,77 @@
+using System.Buffers;
+
+namespace NBConfigBuilder;
+
+public enum MemoryStreamBufferSource
+{
+    None = 0,
+    Pack = 1,
+    UnPack = 2,
+}
+
+public sealed class MemoryStreamBuffer : MemoryStream, IBufferWriter<byte>
+{
+    public MemoryStreamBufferSource MemoryStreamBufferSource;
+
+    public MemoryStreamBuffer()
+    {
+    }
+
+    public MemoryStreamBuffer(MemoryStreamBufferSource memoryStreamBufferSource, int capacity) : base(capacity)
+    {
+        MemoryStreamBufferSource = memoryStreamBufferSource;
+    }
+
+    public MemoryStreamBuffer(byte[] buffer) : base(buffer)
+    {
+    }
+
+    public void Advance(int count)
+    {
+        if (count < 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(count), count, "The value of 'count' cannot be negative.");
+        }
+
+        var newLength = Position + count;
+
+        if (newLength != Length)
+        {
+            SetLength(newLength);
+        }
+
+        Position = newLength;
+    }
+
+    public Memory<byte> GetMemory(int sizeHint = 0)
+    {
+        if (sizeHint < 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(sizeHint), sizeHint,
+                "The value of 'count' cannot be negative.");
+        }
+
+        if (Length - Position <= sizeHint)
+        {
+            SetLength(Position + sizeHint);
+        }
+
+        return new Memory<byte>(GetBuffer(), (int)Position, (int)(Length - Position));
+    }
+
+    public Span<byte> GetSpan(int sizeHint = 0)
+    {
+        if (sizeHint < 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(sizeHint), sizeHint,
+                "The value of 'count' cannot be negative.");
+        }
+
+        if (Length - Position <= sizeHint)
+        {
+            SetLength(Position + sizeHint);
+        }
+
+        return new Span<byte>(GetBuffer(), (int)Position, (int)(Length - Position));
+    }
+}