The outermost message is not stored with a length; this allows multiple
messages to be merged by concatenation. The default behaviour for a protobuf
parser at the root-object is "read until you run out of data". If you have
written multiple messages without some kind of "framing" (usually adding
length-prefixes manually) then it will be very hard to unscramble the data. If
you need to append individual messages and want to parse them back
individually, one option is to encapsulate each in a parent object with a
"repeated" element, with a single element per object. Alternatively, add your
own frames.
Marc
On 21 Apr 2013, at 05:07, Sean Nguyen <sontran...@gmail.com> wrote:
> Hi,
>
> I want to calculate the protocol buffer message size without reading the
> stream to the end? I don't see the size of the outer most message is stored.
> For example:
>
> message Person {
> optional string name = 1;
> optional uint32 age = 2;
> }
>
> There is no size store for the Person message if it is the outer most
> message. Is that correct? If it is not where I can find it?
>
> Thanks,
>
> Son Nguyen
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