Output to memory instead of file using libjpeg and libpng

I need to use libjpeg and libpng to convert an image from the raw RGB format to JPEG and PNG format and then output the result to a memory buffer, and the following two links saved me lots of coding effort:

http://www.codeguru.com/forum/archive/index.php/t-378333.html

http://stackoverflow.com/questions/1821806/how-to-encode-png-to-buffer-using-libpng

Additionally, there is also a good online tutorial showing how to do in-memory data compression using zlib at
http://www.gamedev.net/reference/articles/article2279.asp

PS: just found out that the latest libjpeg (version 8 ) coming out two weeks ago added the in-memory compression method. Cheers!

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