[DJI-log-discuss] Wrong handling in RECOVER Record

[Chris]

I can confirm Daniels investigation in Pascal my implementation looks 
like this:

         keyIndexLowByte := Data[0];
         aKey := $123456789ABCDEF0*keyIndexLowByte;
         aKey := crc64(Typ+keyIndexLowByte and $FF, at aKey,8);
         nKey := parray(@aKey)^;

old:

         scrambleTableIndex := (((Typ - 1) * 256) + keyIndexLowByte);
         nKey := scrambleTable[scrambleTableIndex];

should be easy to re-implement it in c too

with this i dont need an scramble table anymore

Am 19.01.20 um 19:10 schrieb Brett Spell:
>
> I agree with Christian: it’s great to have both (scramble table or 
> direct derivation) options, so thanks to you both (Ross and Daniel) 
> for sharing the information with us.
>
> Brett
>
> *From:*DJI-log-discuss [mailto:dji-log-discuss-bounces at us.live555.com] 
> *On Behalf Of *Christian U.
> *Sent:* Sunday, January 19, 2020 10:28 AM
> *To:* Discussion of DJI's log file formats
> *Subject:* Re: [DJI-log-discuss] Wrong handling in RECOVER Record
>
> i have to add #include <errno.h>
>
> to *djiparsetxt.cpp* 
> <http://gitlab.stora.local/produkte/dji/djiparsetxt/commit/6d14c9f58612d7abf0dcc7a670e6bd2c8eeea7db#cd4aa6484a5080c3e53d4f2c4b7b761f7d09d2f0> 
> to fix compiling with actual gcc
>
> Am 19.01.20 um 15:46 schrieb Chris:
>
>     Great work Ross,
>
>     And also Thanks Daniel for the Information. I think my english is
>     too bad to completely get it.
>
>     Daniel is it completely possible to implement an handler to
>     generate the key on the fly with the information you gave ?
>
>     I have tried to make an implementation based of an crc64 function
>     in december but dont was able to recover all parameters to the
>     gtekey function completely.
>
>
>     best regards and happy new year to all
>
>     Christian
>
>     Am 19.01.20 um 14:03 schrieb Ross Finlayson:
>
>     FYI, the latest version (2020-01-19) of the “djiparsetxt” code
>     also improves the processing of RECOVER records, as a result of
>     Christian’s feedback on December 20th.
>
>
>     Ross Finlayson
>     Live Networks, Inc.
>     http://www.live555.com/
>
>
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