/// <summary>
/// Reads an embedded message field value from the stream.
/// </summary>
public void ReadMessage(IMessage builder)
{
// TODO(jtattermusch): if the message doesn't implement IBufferMessage (and thus does not provide the InternalMergeFrom method),
// what we're doing here works fine, but could be more efficient.
// What happens is that we first initialize a ParseContext from the current coded input stream only to parse the length of the message, at which point
// we will need to switch back again to CodedInputStream-based parsing (which involves copying and storing the state) to be able to
// invoke the legacy MergeFrom(CodedInputStream) method.
// For now, this inefficiency is fine, considering this is only a backward-compatibility scenario (and regenerating the code fixes it).
ParseContext.Initialize(buffer.AsSpan(), ref state, out ParseContext ctx);
try
{
ParsingPrimitivesMessages.ReadMessage(ref ctx, builder);
}
finally
{
ctx.CopyStateTo(this);
}
}
public void ReadMessage(IMessage message)
{
ParsingPrimitivesMessages.ReadMessage(ref this, message);
}
