; A0 -> A1 depacker
AU5_decrunch:
	movem.l	d0-a6,-(sp)
	bsr.s	getinfo		
	cmpi.l	#'AU5!',d0	
	bne	not_packed	
	bsr.s	getinfo		
	lea.l	-8(a0,d0.l),a5	
	bsr.s	getinfo		
	move.l	d0,(sp)		
	move.l	a1,a4		
	move.l	a1,a6
	adda.l	d0,a6		
	move.l	a6,a3		
	move.b	-(a5),d7	
	bsr	normal_bytes

	bsr	get_1_bit 	
	bcc.s	not_packed	
	move.w	#$0f9f,d7 	
AU5_00:	moveq	#3,d6		
AU5_01:	move.w	-(a3),d4	
	moveq	#3,d5		
AU5_02:	add.w	d4,d4		
	addx.w	d0,d0		
	add.w	d4,d4		
	addx.w	d1,d1		
	add.w	d4,d4		
	addx.w	d2,d2		
	add.w	d4,d4		
	addx.w	d3,d3		
	dbra	d5,AU5_02 	
	dbra	d6,AU5_01 	
	movem.w	d0-d3,(a3)	
	dbra	d7,AU5_00 	

not_packed:
	movem.l	(sp)+,d0-a6
	rts

getinfo:
	moveq	#3,d1	
getbytes:
	 lsl.l	#8,d0		
	move.b	(a0)+,d0
	dbf	d1,getbytes
	rts

normal_bytes:	
	bsr.s	get_1_bit
	bcc.s	test_if_end	
	moveq.l	#0,d1		
	bsr.s	get_1_bit
	bcc.s	copy_direkt	
	lea.l	direkt_tab+20(pc),a1
	moveq.l	#4,d3
nextgb:	move.l	-(a1),d0	
	bsr.s	get_d0_bits
	swap.w	d0
	cmp.w	d0,d1		
	dbne	d3,nextgb 	
no_more:
	add.l	20(a1),d1
copy_direkt:	
	move.b	-(a5),-(a6)	
	dbf	d1,copy_direkt	
test_if_end:	
	cmpa.l	a4,a6		
	bgt.s	strings		
	rts	

get_1_bit:
	add.b	d7,d7		
	bne.s	bitfound	
	move.b	-(a5),d7	
	addx.b	d7,d7
bitfound:
	rts	

get_d0_bits:	
	moveq.l	#0,d1		
hole_bit_loop:	
	add.b	d7,d7		
	bne.s	on_d0		
	move.b	-(a5),d7	
	addx.b	d7,d7
on_d0:	addx.w	d1,d1		
	dbf	d0,hole_bit_loop
	rts	

strings:
	lea.l	length_tab(pc),a1
	moveq.l	#3,d2		
get_length_bit:	
	bsr.s	get_1_bit
	dbcc	d2,get_length_bit
no_length_bit:	
	moveq.l	#0,d4		
	moveq.l	#0,d1
	move.b	1(a1,d2.w),d0	
	ext.w	d0		
	bmi.s	no_｜er		
get_｜er:
	bsr.s	get_d0_bits
no_｜er:
	move.b	6(a1,d2.w),d4	
	add.w	d1,d4	
	beq.s	get_offset_2	


	lea.l	more_offset(pc),a1	
	moveq.l	#1,d2
getoffs:
	bsr.s	get_1_bit
	dbcc	d2,getoffs
	moveq.l	#0,d1		
	move.b	1(a1,d2.w),d0	
	ext.w	d0		
	bsr.s	get_d0_bits
	add.w	d2,d2		
	add.w	6(a1,d2.w),d1	
	bpl.s	depack_bytes	
	sub.w	d4,d1		
	bra.s	depack_bytes

get_offset_2:	
	moveq.l	#0,d1		
	moveq.l	#5,d0		
	moveq.l	#-1,d2		
	bsr.s	get_1_bit
	bcc.s	less_40		
	moveq.l	#8,d0		
	moveq.l	#$3f,d2		
less_40:
	bsr.s	get_d0_bits
	add.w	d2,d1		

depack_bytes:			
	lea.l	2(a6,d4.w),a1	
	adda.w	d1,a1		
	move.b	-(a1),-(a6)	
dep_b:	move.b	-(a1),-(a6)	
	dbf	d4,dep_b	
	bra	normal_bytes	


direkt_tab:
	dc.l $7fff000e,$00ff0007,$00070002,$00030001,$00030001
	dc.l 270-1,15-1,8-1,5-1,2-1

length_tab:
	dc.b 9,1,0,-1,-1	
	dc.b 8,4,2,1,0		

more_offset:
	dc.b	  11,4,7,0
	dc.w	$11f,-1,$1f	

;*************************************************** Ende der Unpackroutine
