Hi All,

In the base64 encoding, is it okay to have newlines in the binary data? The BrainVisa files have them, which makes the datasets look nicer. But I didn't know this was a valid base64 encoding, and so my library whines about it.

Note that the datasets are still read properly, aside from the whining...

Should those characters be skipped automatically?
Either way is fine with me, it does make the files easier to view in an editor.

- rick

rick,
I have to look into it but those newlines are not meant to be. The python code that generates the binary array looks like this :

for i in xrange(texture.size()):
val=texture.item(i)
valeur = valeur + pack(fmt, val)
valeur64=base64.encodestring(valeur)

So no sign of new lines... it seem to be systematically inserted added after each chunk of 76 characters.
I'll come back to you about this once I have understood why it is there.

Olivier

Olivier,

It appears that the base64 encoder you are using is encoding the data
for use with email (MIME - Multipurpose Internet Mail Extensions).
See section 2.1 of http://www.ietf.org/rfc/rfc3548.txt or the section
titled MIME in http://en.wikipedia.org/wiki/Base64.

John

>
>>
>> By: Olivier Coulon
>>
>> rick,
>> I have to look into it but those newlines are not meant to be. The
>> python code
>> that generates the binary array looks like this :
>>
>> for i in xrange(texture.size()):
>> val=texture.item(i)
>> valeur = valeur + pack(fmt, val)
>> valeur64=base64.encodestring(valeur)
>>
>> So no sign of new lines... it seem to be systematically inserted
>> added after
>> each chunk of 76 characters.
>> I'll come back to you about this once I have understood why it is
>> there.
>>
>> Olivier
>>

Thank you for this information John. Silly me. I now use another encoding algorithm and it seems to be OK now. I will upload a new version of the files later on today.

Olivier

Dear all,
a new version of the brainvisa-generated gifti files has been uploaded on the site. The base 64 encoding has been changed and they have been checked with gifti_tools. Let me know if you encounter any problem reading them.

Olivier