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#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#endregion
using System.Runtime.CompilerServices;
using System.Security;
namespace Google.Protobuf
{
/// <summary>
/// Writing messages / groups.
/// </summary>
[SecuritySafeCritical]
internal static class WritingPrimitivesMessages
{
/// <summary>
/// Writes a message, without a tag.
/// The data is length-prefixed.
/// </summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void WriteMessage(ref WriteContext ctx, IMessage value)
{
WritingPrimitives.WriteLength(ref ctx.buffer, ref ctx.state, value.CalculateSize());
WriteRawMessage(ref ctx, value);
}
/// <summary>
/// Writes a group, without a tag.
/// </summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void WriteGroup(ref WriteContext ctx, IMessage value)
{
WriteRawMessage(ref ctx, value);
}
/// <summary>
/// Writes a message, without a tag.
/// Message will be written without a length prefix.
/// </summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void WriteRawMessage(ref WriteContext ctx, IMessage message)
{
if (message is IBufferMessage bufferMessage)
{
bufferMessage.InternalWriteTo(ref ctx);
}
else
{
// If we reached here, it means we've ran into a nested message with older generated code
// which doesn't provide the InternalWriteTo method that takes a WriteContext.
// With a slight performance overhead, we can still serialize this message just fine,
// but we need to find the original CodedOutputStream instance that initiated this
// serialization process and make sure its internal state is up to date.
// Note that this performance overhead is not very high (basically copying contents of a struct)
// and it will only be incurred in case the application mixes older and newer generated code.
// Regenerating the code from .proto files will remove this overhead because it will
// generate the InternalWriteTo method we need.
if (ctx.state.CodedOutputStream == null)
{
// This can only happen when the serialization started without providing a CodedOutputStream instance
// (e.g. WriteContext was created directly from a IBufferWriter).
// That also means that one of the new parsing APIs was used at the top level
// and in such case it is reasonable to require that all the nested message provide
// up-to-date generated code with WriteContext support (and fail otherwise).
throw new InvalidProtocolBufferException($"Message {message.GetType().Name} doesn't provide the generated method that enables WriteContext-based serialization. You might need to regenerate the generated protobuf code.");
}
ctx.CopyStateTo(ctx.state.CodedOutputStream);
try
{
// fallback parse using the CodedOutputStream that started current serialization tree
message.WriteTo(ctx.state.CodedOutputStream);
}
finally
{
ctx.LoadStateFrom(ctx.state.CodedOutputStream);
}
}
}
}
}