Thank you Nishen. I will try this and see if I can use it in my code...
Thanks again!
Pierre-Yves
Nishen Naidoo a écrit :
Hi Pierre-Yves,
I haven't used this in a bit, but I think it works... Attached is a
data utility class I have been using. The 'fedoraXMLHashFormat' method
formats a document the same way that Fedora does when computing a
hash... so if you format the doc, and compute the hash on it, it
should be the same as the Fedora generated hash.
Thanks,
Nish
Pierre-Yves JALLUD wrote:
That was what I thought... well, something like that. But is there a
method to verify the checksum when you add an "X" datastream? Maybe a
java librairy?... I have looked for it, but I didn't found it.
Pierre-Yves
Aaron Birkland a écrit :
Hi, Pierre-Yves
When you create an "M" datastream, Fedora stores the content in a
separate location with byte-for-byte accuracy. It stores exactly
what you send without modification. With inline XML (and FOXML in
general), the whitespace (indenting, spaces between attribute
values, etc) may be modified by the object serializer/deserializer.
Indeed, when Fedora calculates the checksum for "X" datastream, it
canonicalizes the content before calculating the checksum so that it
may arrive at the same value despite formatting changes that may
have been introduced in the XML serialization or parsing. Since "M"
datastreams are stored as exact bytes and never travel through an
XML parser, Fedora simply calculates the checksum on the bytes
without any sort of manipulation
-Aaron
-----Original Message-----
From: Pierre-Yves JALLUD [mailto:[email protected]]
Sent: Fri 5/15/2009 5:28 AM
To: fedora-commons-developers
Subject: [Fedora-commons-developers] Checksum problem for datastream
Hi all,
I have a problem of checksum for datastreams. If I add a datastream
with
a Content Model wich is equal to "M", the checksum I had calculate and
the one fedora-commons calculates are the same. But if I add the same
datastream with a Content Model wich is equal to "X", fedora-commons
finds another checksum.
Is that normal?... I don't see why there is a difference... Is that a
bug or a normal behaviour?
Greetings
Pierre-Yves
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