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diff --git a/lib/Net.Messaging.FBM/src/IFBMMessage.cs b/lib/Net.Messaging.FBM/src/IFBMMessage.cs
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+/*
+* Copyright (c) 2023 Vaughn Nugent
+*
+* Library: VNLib
+* Package: VNLib.Net.Messaging.FBM
+* File: IFBMMessage.cs
+*
+* IFBMMessage.cs is part of VNLib.Net.Messaging.FBM which is part of the larger
+* VNLib collection of libraries and utilities.
+*
+* VNLib.Net.Messaging.FBM is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Affero General Public License as
+* published by the Free Software Foundation, either version 3 of the
+* License, or (at your option) any later version.
+*
+* VNLib.Net.Messaging.FBM is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU Affero General Public License for more details.
+*
+* You should have received a copy of the GNU Affero General Public License
+* along with this program. If not, see https://www.gnu.org/licenses/.
+*/
+
+using System;
+
+using VNLib.Net.Http;
+
+namespace VNLib.Net.Messaging.FBM
+{
+ /// <summary>
+ /// Represents basic Fixed Buffer Message protocol operations
+ /// </summary>
+ public interface IFBMMessage
+ {
+ /// <summary>
+ /// The unique id of the message (nonzero)
+ /// </summary>
+ int MessageId { get; }
+ /// <summary>
+ /// Writes a data body to the message of the specified content type
+ /// </summary>
+ /// <param name="body">The body of the message to copy</param>
+ /// <param name="contentType">The content type of the message body</param>
+ /// <exception cref="OutOfMemoryException"></exception>
+ void WriteBody(ReadOnlySpan<byte> body, ContentType contentType = ContentType.Binary);
+ /// <summary>
+ /// Appends an arbitrary header to the current request buffer
+ /// </summary>
+ /// <param name="header">The header id</param>
+ /// <param name="value">The value of the header</param>
+ /// <exception cref="OutOfMemoryException"></exception>
+ void WriteHeader(byte header, ReadOnlySpan<char> value);
+ /// <summary>
+ /// Appends an arbitrary header to the current request buffer
+ /// </summary>
+ /// <param name="header">The <see cref="HeaderCommand"/> of the header</param>
+ /// <param name="value">The value of the header</param>
+ /// <exception cref="OutOfMemoryException"></exception>
+ void WriteHeader(HeaderCommand header, ReadOnlySpan<char> value);
+ }
+} \ No newline at end of file