util: Add a set of binary searches implementation (#9614)
util: Add a set of binary searches implementation (#9614)


NiLuJe/koreader,poire-z/koreader,Frenzie/koreader,NiLuJe/koreader,koreader/koreader,Frenzie/koreader,poire-z/koreader,koreader/koreader