Storing Base64 data in Xindice

[David Cahill <da...@may.ie>]

Hi,

I have converted my binary data(image) into Base64 encoding as required by
Xindice.  Do I now simply cut and paste this Base64 representation into my
image element in the XML document and then copy the whole XML document into
a collection in Xindice? How best do I extract and then decode this image
element when its stored in the database?

Many thanks,

David

RE: Storing Base64 data in Xindice

[Heinrich Götzger <go...@gmx.net>]

On Tue, 26 Nov 2002, Stefan Lischke wrote:

>> I have converted my binary data(image) into Base64 encoding as required by
>> Xindice.  Do I now simply cut and paste this Base64 representation into my
>> image element in the XML document and then copy the whole XML
>> document into
>> a collection in Xindice? How best do I extract and then decode this image
>> element when its stored in the database?
>
>i thought about this too, but i decided not to use xindice to store non xml
>data. But maybe my decision was wrong has anybody any experience with non
>xml data and xindice

Almost a year ago I tried to store data which I'm not aware of whether
they're String or not into Xindice.
The question is: How should Xindice handle Blobs (if it should be able to
handel them anyway)?

My solution was using CDATA. This still remains some risk if the stored
data contains ']]'. So BASE64 Encoding looks good to me as well. Infact
you don't need the CDATA, since '<' or '>' is not part of the BASE64
Alphabet. But you need the time of processing the encoder and the decoder.

Now I paste some java code from my Xindice proxy:


// some global defines
private final String BEGCON_TOKEN = "<content><![CDATA[";
private final String ENDCON_TOKEN = "]]></content>";
private final String XML_PI_TOKEN = "<?xml version=\"1.0\"?>";

// storing document into database


// content holds my binary data
byte[] conten;
[..]
String data = "BEGCON_TOKEN" + new String(.content) + "ENDCON_TOKEN";
XMLResource resource = (XMLResource) col.createResource(id, "XMLResource");
resource.setContent(data);
col.storeResource(resource);


// retreiving document from database using id
[..]
XMLResource resource = (XMLResource) col.getResource(id);
String con = (String)resource.getContent();

// content holds the raw data
byte[] content =
   con.substring( XML_PI_TOKEN.length() + 1 + BEGCON_TOKEN.length(),
   con.length() - ENDCON_TOKEN.length() ).getBytes();

// convert content to whatever it's supposed to be, images, wav files,
// Strings, XMLBinding, whatever....


So, I hope this helps a bit.
I would drop the CDATA now and work with content as BASE64 encoded String.

kind regards

Heinrich
--
http://www.xmlBlaster.org

RE: Storing Base64 data in Xindice

[Heinrich Götzger <go...@gmx.net>]

Mit freundlichen Grüßen

Heinrich Götzger
--
http://www.xmlBlaster.org

RE: Storing Base64 data in Xindice

[Stefan Lischke <li...@novacom.net>]

Hi,

> I have converted my binary data(image) into Base64 encoding as required by
> Xindice.  Do I now simply cut and paste this Base64 representation into my
> image element in the XML document and then copy the whole XML
> document into
> a collection in Xindice? How best do I extract and then decode this image
> element when its stored in the database?

i thought about this too, but i decided not to use xindice to store non xml
data. But maybe my decision was wrong has anybody any experience with non
xml data and xindice

thanx stefan