[sane-devel] add support for ricoh aficio sp100su

[viruxx]

discovered something while playing with this mode

here is the grayscale a4 preview (same than b/w a4 preview) 

>>> dev.write(0x3,"\x03\x09\x01"); dev.read(0x85,100) 
<<<array('B', [0])//scanner response 

>>> dev.write(0x3,"\x03\x0D\x0B"); dev.read(0x85,100) 
<<<array('B', [126, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])//scanner response 

>>> dev.write(0x3,"\x03\x0C\x11\x00\x00\x00\x01\x02\x05\xFF\x00\x00\x00\x00\xE8\x13\x68\x1B"); 
>>> dev.write(0x3,"\x03\x0B\x08"); dev.read(0x85,100) 
<<<array('B', [0, 10, 180, 13, 244, 9, 180, 13]) //scanner response 

>>> dev.write(0x3,"\x03\x08\x04\x00\x00\x00\x00\x08\x89\x00\x01"); //scanner
>>> give a 64000 data packet
 dev.write(0x3,"\x03\x0E\x04\x00\x00\x00\x00\xFA"); dev.read(0x85,100) //add
a 64000 data packet

the \x03\x0E\x04\x00\x00\x00\x00\xFA sequence is executed 32 times

after that it send   \x03\x0E\x04\x00\x00\x00\x00\xBE and receive only 48640
data packet

then return to 32 times   \x03\x0E\x04\x00\x00\x00\x00\xFA 64000 data

until the end







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