Hey Feng, thanks for your input.

Any suggestions for 1) ? Other than using CodingInputStream?

Also is it bad practise to invoke protoc compiler in a production 
environment?

On Wednesday, April 19, 2017 at 11:00:17 PM UTC+5:30, Feng Xiao wrote:
>
>
>
> On Wed, Apr 19, 2017 at 4:20 AM, Rohan Suri <rohan....@gmail.com 
> <javascript:>> wrote:
>
>> Hello everyone,
>>
>> I'm trying to find the right Java APIs to do what protoc --decode_raw and 
>> protoc --decode do.
>> Essentially handling two cases:
>> 1) When I don't have the proto, and only the raw protobuf msg.
>> eg protoc --decode_raw < rawmsg.bin
>>
>> 1: "rohan"
>> 2 {
>>     1: "13"
>>     2: "08"
>>     3: "94"
>> }
>>
>> 2) When I have the .proto(not the generated classes, neither the parsed 
>> .proto)
>> eg protoc --decode some.pkg.name.Person $proto_file_path < rawmsg.bin
>>
>> name: "rohan"
>> dob {
>>      dd: "13"
>>      mm: "08"
>>      yy: "94"
>> }
>>
>> I did dig google groups.
>>
>> From those the hints I've got is
>> For case 1) Using CodedInputStream write my own parser? parsing bytes by 
>> making informed guesses.
>>
>>
>> https://groups.google.com/forum/#!searchin/protobuf/decode$20without$20proto|sort:relevance/protobuf/7s4YIwrQLgk/r2Yc_36OYGAJ
>>
>> http://stackoverflow.com/questions/19647387/parsing-a-raw-protocol-buffer-byte-stream-in-c-sharp/19652735#19652735
>>
>> http://stackoverflow.com/questions/13937882/parsing-protocol-buffers-without-knowing-the-proto
>>
>> For case 2) well nothing. Everything I got assumed I have 
>> FileDescriptorProto for my .proto or instance of my message type.
>>
>
> 2) requires parsing .proto files and that parser is in C++ only. 
>
>>
>> Are there any add-on libraries present to handle these scenarios?
>> Or any logic to go about solving them?
>>
>> Thanks.
>>
>>
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>

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