public static <T> void mergeFrom(InputStream in, T message, Schema<T> schema,
            LinkedBuffer buffer) throws IOException
    {
        IOUtil.mergeFrom(in, buffer.buffer, message, schema, false);
    }
Merges the {@code message} from the {@link InputStream} using the given {@code schema}.
<p>
The {@code buffer}'s internal byte array will be used for reading the message.
protostuff-core/src/main/java/io/protostuff/ProtobufIOUtil.java