fix speed and ETA, do not verify md5 if sizes do not match
fix speed and ETA, do not verify md5 if sizes do not match

WangKaimin/bypy,oouyang/bypy,adrianzhang/bypy,krizex/bypy,houtianze/bypy,rocky1001/bypy,liuycsd/bypy,Zocalos/bypy,liuycsd/bypy,YelaSeamless/bypy,liujianpc/bypy,menghan/bypy,zeropool/bypy,nucked/bypy,usr0418/bypy,hxford/bypy,MaolinWang/bypy,rchlin/bypy,houtianze/bypy,alex1818/bypy,yusiwen/bypy,wwj718/bypy,RobberPhex/bypy,jezhang/bypy,eehello/bypy