On Sun, Apr 6, 2014 at 2:34 AM, Andreas Schildbach <
andreas.schildb...@googlemail.com> wrote:

> For our application, we chose a protobuf format without delimiting. We
> thought the EOF that would occur when reading the file would suffice. (For
> those interested: It's the Bitcoin wallet format for bitcoinj-based apps)
>
> Now I'd like to wrap it in an encryption layer. Unfortunately, the
> encryption I want to use is a padding block cipher. That means after the
> encrypt/decrypt roundtrip you'll end up with zero bytes appended to the
> serialized protobuf.
>
> I know I could switch my serialization code to the readDelimitedFrom() and
> writeDelimitedTo() pair, but that would make the format incompatible due to
> the prepended varint length field.
>
> *Question:* Is it possible, either programmatically or by declaring it in
> the .proto file, that a zero tag ends the deserialization just like an EOF
> would do?
>
No. A zero tag means invalid protobuf wire format and the parsing code
should throw an exception when it's met.


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