Ported r2870 from ZXing
Ported r2870 from ZXing

Original commit message: "Issue 1762 PDF417 speed up and back-port to
Java"

davidjackman/ZXingObjC,YotrolZ/ZXingObjC,jebai0521/ZXingObjC,Kevin775263419/ZXingObjC,TheLevelUp/ZXingObjC,Kevin775263419/ZXingObjC,rkpant/ZXingObjC,ufs-slizhik/ZXingObjC,RockyAo/ZXingObjC,RockyAo/ZXingObjC,Stocard/ZXingObjC,benjohnde/ZXingObjC,jianwoo/ZXingObjC,peacemoon/ZXingObjC,ufs-slizhik/ZXingObjC,sdhzwm/ZXingObjC,rowliny/ZXingObjC,elegion/ios-pods-ZXingObjC,adan016/ZXingObjC,fuzhiqiang1989/ZXingObjC,Stocard/ZXingObjC,sdhzwm/ZXingObjC,Kalvar/ZXingObjC,trsathya/ZXingObjC,fanwenkai/ZXingObjC,Kalvar/ZXingObjC,JeremyPacker/ZXingObjC,rkpant/ZXingObjC,zilaiyedaren/ZXingObjC,adan016/ZXingObjC,TheLevelUp/ZXingObjC,trsathya/ZXingObjC,rowliny/ZXingObjC,jebai0521/ZXingObjC,cortices/ZXingObjC,davidjackman/ZXingObjC,JeremyPacker/ZXingObjC,zeffon/ZXingObjC,tejesh-alimilli/ZXingObjC,YotrolZ/ZXingObjC,benjohnde/ZXingObjC,xuxubin/ZXingObjC,jianwoo/ZXingObjC,wuxsoft/ZXingObjC,xuxubin/ZXingObjC,cortices/ZXingObjC,elegion/ios-pods-ZXingObjC,zeffon/ZXingObjC,wuxsoft/ZXingObjC,tejesh-alimilli/ZXingObjC,fuzhiqiang1989/ZXingObjC,peacemoon/ZXingObjC,fanwenkai/ZXingObjC,zilaiyedaren/ZXingObjC