Thanks, all. I'll give it a try !
-ssk On Apr 16, 12:50 pm, Marc Gravell <marc.grav...@gmail.com> wrote: > d'oh! Engage brain, then talk! Yes, you're entirely right; testing it as a > sub-message and trying UTF8 as a fallback makes a lot more sense. > > Marc > > On 16 April 2010 03:23, Kenton Varda <ken...@google.com> wrote: > > > > > On Thu, Apr 15, 2010 at 2:55 PM, Marc Gravell <marc.grav...@gmail.com>wrote: > > >> In the case you don't have the definition (perhaps a network inspector), > >> you could always *try* to parse it as UTF8 - if it passes as UTF8 the > >> chances are fairly good that it truly is a UTF8 string - and the confidence > >> should go up as the string gets longer (since the chance of a random .proto > >> meeting the UFT8 spec isn't great). > > > Actually, it's very easy for a random proto to meet UTF-8, since it is easy > > for a random proto to have no bytes with the top bit set. Also, this > > technique doesn't help you distinguish between messages and "bytes". The > > opposite heuristic may work better -- assume it is a message if it > > successfully parses as one. Although, this isn't a whole lot better -- the > > encoding is dense enough that random bytes can often parse successfully. > > >> Marc > > >> On 15 April 2010 21:08, Daniel Wright <dwri...@google.com> wrote: > > >>> You can't tell without the .proto file. Protocol buffers are really > >>> intended to be used in conjunction with the .proto file, and it's only in > >>> rare cases (usually for debugging) that you'd ever want to try to > >>> understand > >>> them without the .proto file (or better yet, the protocol descriptor). > > >>> Note that most users shouldn't write their own decoding code -- ideally > >>> you should use one of the existing APIs. > > >>> On Thu, Apr 15, 2010 at 12:58 PM, ssk <tatsuya....@gmail.com> wrote: > > >>>> Hi gurus, > > >>>> I've just dived into protocol buffers and been reading "http:// > >>>> code.google.com/apis/protocolbuffers/docs/encoding.html". > > >>>> I was trying to decode encoded messages but I'm totally stuck. > >>>> Wondering how I can tell an element is a regular string or an embedded > >>>> message if its element type is 2. > >>>> If I have its proto file, probably I could. But if I don't have > >>>> one ??? > > >>>> Is there any way I can figure it out ? or impossible ? > > >>>> Thanks in advance. > > >>>> -ssk > > >>>> -- > >>>> You received this message because you are subscribed to the Google > >>>> Groups "Protocol Buffers" group. > >>>> To post to this group, send email to proto...@googlegroups.com. > >>>> To unsubscribe from this group, send email to > >>>> protobuf+unsubscr...@googlegroups.com<protobuf%2bunsubscr...@googlegroups.com> > >>>> . > >>>> For more options, visit this group at > >>>>http://groups.google.com/group/protobuf?hl=en. > > >>> -- > >>> You received this message because you are subscribed to the Google Groups > >>> "Protocol Buffers" group. > >>> To post to this group, send email to proto...@googlegroups.com. > >>> To unsubscribe from this group, send email to > >>> protobuf+unsubscr...@googlegroups.com<protobuf%2bunsubscr...@googlegroups.com> > >>> . > >>> For more options, visit this group at > >>>http://groups.google.com/group/protobuf?hl=en. > > >> -- > >> Regards, > > >> Marc > > >> -- > >> You received this message because you are subscribed to the Google Groups > >> "Protocol Buffers" group. > >> To post to this group, send email to proto...@googlegroups.com. > >> To unsubscribe from this group, send email to > >> protobuf+unsubscr...@googlegroups.com<protobuf%2bunsubscr...@googlegroups.com> > >> . > >> For more options, visit this group at > >>http://groups.google.com/group/protobuf?hl=en. > > -- > Regards, > > Marc > > -- > You received this message because you are subscribed to the Google Groups > "Protocol Buffers" group. > To post to this group, send email to proto...@googlegroups.com. > To unsubscribe from this group, send email to > protobuf+unsubscr...@googlegroups.com. > For more options, visit this group > athttp://groups.google.com/group/protobuf?hl=en. -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To post to this group, send email to proto...@googlegroups.com. To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/protobuf?hl=en.
