https://developers.google.com/protocol-buffers/docs/reference/cpp/google.protobuf.io.coded_stream
On Sat, Jul 7, 2018 at 4:16 PM, John Lilley <whee...@gmail.com> wrote:
> OK in Java I've found the classes UInt32Value, StringValue, etc.
> C++ isn't quite so obvious. Where should I look for those classes?
> Thanks
> john
>
> On Sat, Jul 7, 2018 at 2:03 PM John Lilley <whee...@gmail.com> wrote:
>>
>> Does protobuf include utility methods for direct ser/deser on varint,
>> string, etc?
>> Thanks
>> john
>>
>> On Sat, Jul 7, 2018 at 2:02 PM John Lilley <whee...@gmail.com> wrote:
>>>
>>> Thanks!
>>> Given that, is there any advantage to a "header message" as opposed to
>>> just hand-serializing everything in the header?
>>>
>>>
>>> On Sat, Jul 7, 2018 at 12:45 PM Ilia Mirkin <imir...@alum.mit.edu> wrote:
>>>>
>>>> You need explicit lengths. Usually this is done as <header length
>>>> varint><header><body>. And the header contains the body length in it.
>>>> In Java, there's a CodedInputStream/OutputStream which makes it easy
>>>> to consume fixed lengths (push/popLimit) as well as raw varints (as
>>>> for the initial header length). Other languages have similar
>>>> abstractions.
>>>>
>>>> On Sat, Jul 7, 2018 at 2:26 PM, John Lilley <whee...@gmail.com> wrote:
>>>> > I am posting protobuf messages to a message broker, and in order to
>>>> > identify
>>>> > them, I prefix the message bytes with the serialized result of a
>>>> > "header"
>>>> > message:
>>>> >
>>>> > message Header {
>>>> > int version = 1;
>>>> > string message_type = 2;
>>>> > }
>>>> >
>>>> > It is easy, to concatenate the header+actual message bytes and post
>>>> > the
>>>> > resulting block to a queue. But how do I take these apart on the
>>>> > receiving
>>>> > end? Suppose I get a byte-buffer consisting of:
>>>> >
>>>> > ---------------
>>>> > | header |
>>>> > ---------------
>>>> > | body |
>>>> > ---------------
>>>> >
>>>> > Is it OK to throw this oversized buffer at the Header deserialization?
>>>> > Will
>>>> > the extra bytes hurt anything?
>>>> >
>>>> > Then, once I extract the Header message, how do I know where the body
>>>> > begins? I could turn around and ask the Header object "how big would
>>>> > you be
>>>> > if serialized?". Is that reliable? Is there a better way?
>>>> >
>>>> > Thanks
>>>> > john
>>>> >
>>>> > --
>>>> > You received this message because you are subscribed to the Google
>>>> > Groups
>>>> > "Protocol Buffers" group.
>>>> > To unsubscribe from this group and stop receiving emails from it, send
>>>> > an
>>>> > email to protobuf+unsubscr...@googlegroups.com.
>>>> > To post to this group, send email to protobuf@googlegroups.com.
>>>> > Visit this group at https://groups.google.com/group/protobuf.
>>>> > For more options, visit https://groups.google.com/d/optout.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Protocol Buffers" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to protobuf+unsubscr...@googlegroups.com.
> To post to this group, send email to protobuf@googlegroups.com.
> Visit this group at https://groups.google.com/group/protobuf.
> For more options, visit https://groups.google.com/d/optout.
--
You received this message because you are subscribed to the Google Groups
"Protocol Buffers" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to protobuf+unsubscr...@googlegroups.com.
To post to this group, send email to protobuf@googlegroups.com.
Visit this group at https://groups.google.com/group/protobuf.
For more options, visit https://groups.google.com/d/optout.
