decoding jpg and show imags on TFTLCD whit lpc1768

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Right now, I don't know more about JPEG and Tiny JPEG decoder than you. (Probably except for some basic knowledge of compression algorithms). All I can do is to study the code and get additional information of general JPEG working. That's what I suggest as your next steps. I'll return to my own business in the meantime.
 
for decode and show images in display we have 4 step
1_ open JPEG file from SD
2_ Analyze
3_decode
4_show image on display
I don't have problem with step1 ,I open SD with FlashFs library like this
FILE *fp;
finit(NULL);
fp = fopen ("M:\\New folder\\JPG1.jpg","r");
for step 2 I don't know where should I start from
 
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