Indicate FFC0/FFC2 difference

[crashdemons]

Short name	Bytes	Payload	Name	Comments
SOF0	0xFF, 0xC0	variable size	Start Of Frame (baseline DCT)	Indicates that this is a baseline DCT-based JPEG, and specifies the width, height, number of components, and component subsampling (e.g., 4:2:0).
SOF2	0xFF, 0xC2	variable size	Start Of Frame (progressive DCT)	Indicates that this is a progressive DCT-based JPEG, and specifies the width, height, number of components, and component subsampling (e.g., 4:2:0).

via wikipedia

no information on FFC1/SOF1 though

[crashdemons]

http://cs.haifa.ac.il/~nimrod/Compression/JPEG/J6sntx2004.pdf