- From: Pete Cordell <petexmldev@tech-know-ware.com>
- Date: Thu, 29 Sep 2005 17:48:27 +0100
- To: "Shashikala Shamarao" <shashikala_shamarao@yahoo.com>, <xmlschema-dev@w3.org>
Hi Shashi, What I meant was, you can do: JPEG -> base64 -> XML -> compress, (and the size is comparable to JPEG -> XML assuming your JPEG data is significantly larger than your XML text data) but you can't do: JPEG -> base64 -> compress -> XML as in the latter case you are back to a binary in XML problem. I think it's theoretically possible to set the first case up as a streaming pipeline so that intermediate storage of all objects is not required, but whether there are any off the shelf implementations to do that I don't know. Whether its acceptable performance for your application is harder to comment on. Pete. -- ----- Original Message ----- From: "Shashikala Shamarao" <shashikala_shamarao@yahoo.com> To: "Pete Cordell" <petexmldev@tech-know-ware.com>; <xmlschema-dev@w3.org> Sent: Thursday, September 29, 2005 5:03 PM Subject: Re: Image information in XML > Hi Pete, > > Yes, I did figured out. But I still do not know how efficient it will be > with regards to performance. That is for example, if we have lots of > images in each document, we need to base64 encode the images and then > compress it before embedding it into XML. I am currently testing this part > to analyse the performance. > > Thanks again > Shashi > > Pete Cordell <petexmldev@tech-know-ware.com> wrote: > > Hi Shashi, > > Yes. You can compress the whole of the XML message with the image data > contained in it. Just looking at the JPEG part of a payload I did some > quick tests and it seems that compressing would compensate for the base64 > expansion: > > JPEG file: 105,482 bytes (where , has its UK meaning) > JPEG -> ZIP file: 105,417 bytes (implies JPEG is working well!) > JPEG -> Base64 file: 144,346 bytes (includes some extra line feeds in > addition to 4/3 expansion) > JPEG -> Base64 -> ZIP file: 109, 293 bytes > > This does show that compressing can get back much of what you loose by > Base64 encoding. > > Regards, > > Pete. > -- > ============================================= > Pete Cordell > Tech-Know-Ware Ltd > for XML to C++ data binding visit > http://www.tech-know-ware.com/lmx > (or http://www.xml2cpp.com) > ============================================= > > ----- Original Message ----- > From: "Shashikala Shamarao" > To: "Pete Cordell" > ; > Sent: Wednesday, September 28, 2005 10:56 PM > Subject: Re: Image information in XML > > >> Hi Pete, >> >> Thanks for the response. Is it possible to compress the data after it has >> been encoded. >> >> Thanks, >> Shashi >> >> Pete Cordell > wrote: >> >> Hi Shashi, >> >> The normal approach is to base64 encode binary data >> (http://www.faqs.org/rfcs/rfc3548.html) (or hex encode). This does result >> in some data expansion though. Every 3 bytes will be turned into 4. I >> don't know of any other solution that would work with a standard XML >> parser, >> although some multiple file / out of band technique may work. >> >> Pete. >> ----- Original Message ----- >> From: "Shashikala Shamarao" >> To: >> Sent: Wednesday, September 28, 2005 12:06 AM >> Subject: Image information in XML >> >> >>> Hi, >>> >>> Currently I am stuck with a problem realted to image in XML. >>> >>> I want to know how can I send image information in XML like below. >>> >>> My XML response should look like: >>> >>> >>> >>> >>> contains binary data >>> >>> >>> >>> contains binary data >>> >>> >>> >>> contains binary data >>> >>> >>> >>> >>> >>> I looked at multipart MIME, these define a boundary at the begining say >>> "bounary1" and at the end of every content whose mime type is different, >>> boundary will be defined. What I am wondering is, is it possible to >>> define >>> boundary for each element , so I can send the bit by bit >>> information to the parser instead of waiting for the whole document to >>> be >>> created in memory and then sending it to parser? >>> >>> Any answers would be appreciated. >>> >>> Thanks in advance >>> Shashi >> -- >> ============================================= >> Pete Cordell >> Tech-Know-Ware Ltd >> for XML to C++ data binding visit >> http://www.tech-know-ware.com/lmx >> (or http://www.xml2cpp.com) >> ============================================= >> >> >> >> >> >> __________________________________________________ >> Do You Yahoo!? >> Tired of spam? Yahoo! Mail has the best spam protection around >> http://mail.yahoo.com > > > > > > --------------------------------- > Yahoo! for Good > Click here to donate to the Hurricane Katrina relief effort.
Received on Thursday, 29 September 2005 16:48:50 UTC