bitmap -> png stream

Hi there,

I'm a "few days newbie" with MNG format and libmng. Everything goes OK, except 
preparing data for IDAT chunk. I'm using mng_putchunk_idat(). As far I know, 
this function expect in Rawdata parametr PNG stream data, not a plain bitmap 
data.

The question is how to transform bitmap to PNG stream through libmng functions.

Can someone give me hint how to do this?

Thank you

Mirek Scholze jr.

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