I haven't looked at the decode_raw logic either, but wire type 2 is
used for all length-delimited values. That's strings, bytes, and
embedded messages (and packed repeated fields). decode_raw doesn't
know when it's an embedded message and when it's a string/bytes. So it
has to guess somehow, based on some heuristics (like how well the
values decode, presumably). And here it guesses wrong.
Cheers,
-ilia
On Wed, May 19, 2021 at 10:40 AM Barry waldbaum
<barry.waldb...@gmail.com> wrote:
>
> I've been building tools to generate generic protobuf data from json (yes,
> I'm aware I lose context, this is for testing)
>
> I've found a message I can parse properly, but protoc --decode_raw can't:
>
> \n \a 3 4 5 0 0 0 0
>
> protoc
> 1 {
> 6 {
> }
> 6: 0x30303030
> }
>
> to reproduce it:
>
> echo -n $'\x0a' > binary.dat; echo -n $'\x07' >> binary.dat; echo -n
> $'3450000' >> binary.dat ; protoc --decode_raw < binary.dat
>
> I'm able to parse this properly using protowire as:
> 1: "3450000"
>
> also if I change the first character in the bytes to a '1' I get a valid
> output:
>
> $ echo -n $'\x0a' > binary.dat; echo -n $'\x07' >> binary.dat; echo -n
> $'1450000' >> binary.dat ; protoc --decode_raw < binary.dat
> 1: "1450000"
>
> $ protoc --version
> libprotoc 3.15.8
>
> I've worked really hard to keep the reproduction as simple as possible, I
> haven't dug into the code for decode_raw yet, that's my next step..
>
> thanks
> -Barry
>
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