Google上淘的一個ymodem的c實現

//http://code.google.com/p/xtreamerdev/source/browse/trunk/rtdsr/?r=2#rtdsr%253Fstate%253Dclosed /* ymodem for RTD Serial Recovery (rtdsr) * * copyright (c) 2011 Pete B. <xtreamerdev@gmail.com> *

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