@Override
    public void writeSFixed64(final int fieldNumber, final long value, boolean repeated)
            throws IOException
    {
        writeTag(fieldNumber, WireFormat.WIRETYPE_FIXED64);
        writeSFixed64NoTag(value);
    }
Write an {@code sfixed64} field, including tag, to the stream.
protostuff-core/src/test/java/io/protostuff/CodedOutput.java