internal static void MergeFrom(this IMessage message, ReadOnlySpan <byte> data, bool discardUnknownFields, ExtensionRegistry registry)
{
ParseContext.Initialize(data, out ParseContext ctx);
ctx.DiscardUnknownFields = discardUnknownFields;
ctx.ExtensionRegistry = registry;
ParsingPrimitivesMessages.ReadRawMessage(ref ctx, message);
ParsingPrimitivesMessages.CheckReadEndOfStreamTag(ref ctx.state);
}
internal static T Read <T>(ref ParseContext ctx, FieldCodec <T> codec)
{
int length = ctx.ReadLength();
int oldLimit = SegmentedBufferHelper.PushLimit(ref ctx.state, length);
uint tag;
T value = codec.DefaultValue;
while ((tag = ctx.ReadTag()) != 0)
{
if (tag == codec.Tag)
{
value = codec.Read(ref ctx);
}
else
{
ParsingPrimitivesMessages.SkipLastField(ref ctx.buffer, ref ctx.state);
}
}
ParsingPrimitivesMessages.CheckReadEndOfStreamTag(ref ctx.state);
SegmentedBufferHelper.PopLimit(ref ctx.state, oldLimit);
return(value);
}
/// <summary>
/// Verifies that the last call to ReadTag() returned tag 0 - in other words,
/// we've reached the end of the stream when we expected to.
/// </summary>
/// <exception cref="InvalidProtocolBufferException">The
/// tag read was not the one specified</exception>
internal void CheckReadEndOfStreamTag()
{
ParsingPrimitivesMessages.CheckReadEndOfStreamTag(ref state);
}
