▁present . ▁ ▁The ▁compression ▁is ▁a ▁variety ▁of ▁R LE ▁Com pression ▁using ▁flags . ▁ ▁It ▁can ▁be ▁dec oded ▁as ▁follows : ▁▁ ▁Loop ▁until ▁we ▁have ▁[ Final ▁length ] ▁bytes ▁worth ▁of ▁data ▁( final ▁length ▁calculated ▁from ▁image ▁size .) ▁ ▁While ▁[ De com pressed ▁data ▁length ] ▁< ▁[ Final ▁length ]: ▁ ▁Read ▁a ▁byte ▁[ Value ] ▁ ▁If ▁[ Value ] ▁> ▁ 1 2 8 , ▁then : ▁ ▁Read ▁the ▁next ▁byte ▁and ▁output ▁it ▁( 2 5 7 ▁- ▁[ Value ]) ▁times . ▁ ▁Move ▁forward ▁ 2 ▁bytes ▁and ▁return ▁to ▁step ▁ 1 . ▁ ▁Else ▁if ▁[ Value ] ▁< ▁ 1 2 8 , ▁then : ▁ ▁Read ▁and ▁output ▁the ▁next ▁[ value ▁+ ▁ 1 ] ▁bytes ▁ ▁Move ▁forward ▁[ Value ▁+ ▁ 2 ] ▁bytes ▁and ▁return ▁to ▁step ▁ 1 . ▁ ▁Else ▁[ Value ] ▁= ▁ 1 2 8 , ▁exit ▁the ▁loop ▁( stop ▁decom press ing ) ▁ ▁For ▁the ▁compression ▁routine , ▁it ' s ▁best ▁to ▁encode ▁a ▁ 2 ▁byte ▁repeat ▁run ▁as ▁a ▁rep licate ▁run ▁except ▁when ▁preced ed ▁and ▁followed ▁by ▁a ▁literal ▁run , ▁in ▁which ▁case ▁it ▁is ▁best ▁to ▁merge ▁the ▁three ▁into ▁one ▁literal ▁run . ▁Always ▁encode ▁> 3 ▁byte ▁repe ats ▁as ▁rep licate ▁runs . ▁ ▁C AM G : ▁Am iga ▁mode ▁ ▁A ▁C AM G ▁chunk ▁is ▁specifically ▁for