Sonic Clackers compression found in Tempo 32X

The compression format used in Sonic Clackers for field art and SEGA logo art was found in Tempo for 32X. Unknown if it is used for graphics/data in Tempo.


sc_dec.s
; ===========================================================================
; ---------------------------------------------------------------------------
; Crackers Decompression Algorithm
; ---------------------------------------------------------------------------

CracDec:
        movem.l d1-d7/a2,-(sp)
        move.w  (a0)+,d7
        move.w  d7,d2
        andi.w  #$3FFF,d7
        eor.w   d7,d2
        rol.w   #2,d2
        moveq   #4,d1
        sub.w   d2,d1
        moveq   #1,d2
        lsl.w   d1,d2
        subq.w  #1,d2

loc_8856:
        move.b  (a0)+,d5
        moveq   #7,d6

loc_885A:
        add.b   d5,d5
        bcs.w   loc_8870
        move.b  (a0)+,(a1)+
        dbf d6,loc_885A
        dbf d7,loc_8856
        movem.l (sp)+,d1-d7/a2
        rts

loc_8870:
        moveq   #0,d3
        move.b  (a0)+,d3
        move.w  d3,d4
        lsr.w   d1,d3
        and.w   d2,d4
        neg.w   d3
        lea -1(a1,d3.w),a2
        addq.w  #1,d4

loc_8882:
        move.b  (a2)+,(a1)+
        dbf d4,loc_8882
        dbf d6,loc_885A
        dbf d7,loc_8856
        movem.l (sp)+,d1-d7/a2
        rts


sc_dec_code.bin
48E77F203E18340702473FFFBF42E55A720492427401E36A53421A187C07DA056500001212D851CEFFF651CFFFEE4CDF04FE4E75760016183803E26BC842444345F130FF524412DA51CCFFFC51CEFFD051CFFFC84CDF04FE4E75