NEW
  AUTO 3,1
*--------------------------------------
* ZPInBufPtr = Ptr to Uncompressed Data
* ZPOutBufPtr = Ptr to Shunk Data
* Y,A = ULEN
*--------------------------------------
* ZPInBufPtr
* ZPOutBufPtr
* ZPBackPtr
* ZPStrPtr
 *--------------------------------------
X.Arc			>STYA X.Arc.ShnkOut+S.ARCSHNK.ULEN

				eor #$ff
				sta X.Arc.nCnt+1
				sta X.Arc.nCntOut+1
				tya
				eor #$ff
				sta X.Arc.nCnt
				sta X.Arc.nCntOut

				stz X.Arc.ShnkOut+S.ARCSHNK.TBLBITS
				stz X.Arc.ShnkOut+S.ARCSHNK.TBLBITS+1

				>LDYA ZPInBufPtr
				>STYA X.Arc.InBufPtr
				>LDYA ZPOutBufPtr
				>STYA X.Arc.OutBufPtr

				jsr X.Arc.Reset			Reset counters
* PASS #1
				stz X.Arc.STRLen

				jsr X.Arc.Run1

				lda #32					4 Bytes header
				sta X.Arc.TBits
				sta X.Arc.BLBits
				sta X.Arc.TBLBits

				jsr X.Arc.ComputeTBits

				lda X.Arc.BLL.Max
				beq .1

				jsr X.Arc.ComputeBLBits
				jsr X.Arc.ComputeTBLBits

.1				.DO DBG
				jsr X.Arc.PrintDBG1
				jsr X.Arc.PrintDBG2
				.FIN

				jsr X.Arc.Select
				bcs .9

				sta X.Arc.Alg
* PASS #2
				>LDYA X.Arc.InBufPtr
				>STYA ZPInBufPtr

				>LDYA X.Arc.nCntOut
				>STYA X.Arc.nCnt

				stz X.Arc.STRLen

				jsr X.Arc.Out.Init2		Initialize properly for first "PutBit" Call
				bcs .9

				jsr X.Arc.Run2
				bcs .9

				.DO DBG
				jsr X.Arc.ComputeDBG3	Get exact output bit count...
				.FIN

				jsr X.Arc.Close			...before sending last FULL byte
				bcs .9

				.DO DBG
				jsr X.Arc.PrintDBG3
				>DEBUG
				.FIN

				jsr X.Arc.RestorePtrs
				
				>LDYA X.Arc.CLen
				ldx X.Arc.Alg
				clc
				rts

.9				jsr X.Arc.RestorePtrs
				
				>LDYA X.Arc.ShnkOut+S.ARCSHNK.ULEN
				ldx #0
				sec
				rts
*--------------------------------------
X.Arc.RestorePtrs
				>LDYA X.Arc.InBufPtr
				>STYA ZPInBufPtr
				>LDYA X.Arc.OutBufPtr
				>STYA ZPOutBufPtr
				rts
*--------------------------------------
X.Arc.Reset		ldx #X.Arc.ResetCnt

.1				stz X.Arc.ResetData-1,x
				dex
				bne .1

*				ldx #0

.2				stz X.Arc.TopCntL,x
				stz X.Arc.TopCntH,x
				stz	X.Arc.TopCntBLL,x
				stz X.Arc.TopCntBLH,x
				inx
				bne .2

				lda X.Arc.ShnkOut+S.ARCSHNK.ULEN+1
				sta X.Arc.Bits+1

				lda X.Arc.ShnkOut+S.ARCSHNK.ULEN

				ldx #3

.3				asl
				rol X.Arc.Bits+1
				rol X.Arc.Bits+2
				dex
				bne .3

				sta X.Arc.Bits

				rts
*--------------------------------------
X.Arc.Run1		inc X.Arc.nCnt
				bne .1

				inc X.Arc.nCnt+1
				beq X.Arc.StrStat			0 byte left, flush pending string

.1				jsr X.Arc.ScanBL
				bcc .5

				lda (ZPInBufPtr)

				tax
				inc X.Arc.TopCntBLL,x
				bne .2

				inc X.Arc.TopCntBLH,x

.2				inc X.Arc.TopCntL,x
				bne .3

				inc X.Arc.TopCntH,x

.3				inc X.Arc.STRLen
				lda X.Arc.STRLen
				cmp #STR.MAX
				bcc .4

				jsr X.Arc.StrStat		Max Len string, flush

.4				inc ZPInBufPtr
				bne X.Arc.Run1

				inc ZPInBufPtr+1
				bra X.Arc.Run1
*--------------------------------------
.5				jsr X.Arc.StrStat		flush pending string

				jsr X.Arc.BlStat

				ldy X.Arc.BLLen
				jsr X.Arc.StrSkipY
				bcc .1
				
				clc						End Of InBuf
				rts
*--------------------------------------
X.Arc.StrStat	lda X.Arc.STRLen
				tay
				beq .8

				cmp #STR.MIN
				bcs .1

*				clc
				adc X.Arc.S.TB.Cnt
				sta X.Arc.S.TB.Cnt
				bcc .5

				inc X.Arc.S.TB.Cnt+1
				bra .5

.1				clc
				adc X.Arc.STR.TB.Cnt
				sta X.Arc.STR.TB.Cnt
				bcc .2

				inc X.Arc.STR.TB.Cnt+1

.2				lda X.Arc.STRLen
				cmp X.Arc.STR.Max
				bcc .3

				sta X.Arc.STR.Max

.3				cmp #STR.MID
				bcc .4

				inc X.Arc.STR.LL.Cnt
				bne .5

				inc X.Arc.STR.LL.Cnt+1
				bra .5

.4				inc X.Arc.STR.SL.Cnt
				bne .5

				inc X.Arc.STR.SL.Cnt+1
				
.5				ldy #0

.6				lda (ZPStrPtr),y
				tax

				inc X.Arc.TopCntL,x
				bne .7

				inc X.Arc.TopCntH,x

.7				iny
				cpy X.Arc.STRLen
				bne .6

				stz X.Arc.STRLen

.8				rts
*--------------------------------------
X.Arc.StrSkipY	tya
				clc
				adc ZPInBufPtr
				sta ZPInBufPtr
				bcc .1

				inc ZPInBufPtr+1

.1				tya
				clc
				adc X.Arc.nCnt
				sta X.Arc.nCnt
				bcc .8

				inc X.Arc.nCnt+1
				beq .8					CS
				
				clc
				
.8				rts				
*--------------------------------------
X.Arc.BlStat	lda X.Arc.BLLen
				clc
				adc X.Arc.BL.TB.Cnt
				sta X.Arc.BL.TB.Cnt
				bcc .10

				inc X.Arc.BL.TB.Cnt+1

.10				lda X.Arc.BLLen
				cmp X.Arc.BLL.Max
				bcc .11

				sta X.Arc.BLL.Max

.11				cmp #BLL.MID
				bcc .12

				inc X.Arc.BLL.LL.Cnt
				bne .20

				inc X.Arc.BLL.LL.Cnt+1
				bra .20

.12				inc X.Arc.BLL.SL.Cnt
				bne .20

				inc X.Arc.BLL.SL.Cnt+1
* BLOFS
.20				>LDYA X.Arc.Ofs
				cpy X.Arc.BLO.Max
				pha
				sbc X.Arc.BLO.Max+1
				pla
				bcc .21

				>STYA X.Arc.BLO.Max

.21				jsr X.Arc.GetYABitCntInX
				inc X.Arc.BLO.LO.cnt-1,x
				bne .30

				inc X.Arc.BLO.HI.cnt-1,x

.30				lda X.Arc.BLLen
				
.33				clc
				adc X.Arc.Ofs
				sta ZPBackPtr
				lda #0
				adc X.Arc.Ofs+1
				sta ZPBackPtr+1
				
				ldy #0
				
.34				lda (ZPBackPtr),y
				tax

				inc X.Arc.TopCntL,x
				bne .35

				inc X.Arc.TopCntH,x

.35				iny
				cpy X.Arc.BLLen
				bne .34

.8				rts
*--------------------------------------
X.Arc.ComputeTBits
				ldy #0

.1				stz X.Arc.Cnt				Init best score to 0
				stz X.Arc.Cnt+1

				sec
				ror X.Arc.bStop

				ldx #0

.2				lda X.Arc.TopCntH,x
				bne .20

				lda X.Arc.TopCntL,x
				cmp #TOP.MIN.CNT
				bcc .3

.20				stz X.Arc.bStop

				lda X.Arc.Cnt
				cmp X.Arc.TopCntL,x		is it better at X
				lda X.Arc.Cnt+1
				sbc X.Arc.TopCntH,x
				bcs .3					not better or equal...

				stx X.Arc.Best			save new score index...

				lda X.Arc.TopCntL,x
				sta X.Arc.Cnt				...and value
				lda X.Arc.TopCntH,x
				sta X.Arc.Cnt+1

.3				inx
				bne .2

				bit X.Arc.bStop
				bmi .6

				ldx X.Arc.Best
				lda X.Arc.TOP.Widths,y
				clc
				adc #ARC.B.RAWTOP.W		add ARC.B.TOP bits

.4				pha

				lda X.Arc.TopCntL,x
				clc
				adc X.Arc.TBits
				sta X.Arc.TBits

				lda X.Arc.TopCntH,x
				adc X.Arc.TBits+1
				sta X.Arc.TBits+1
				bcc .5

				inc X.Arc.TBits+2

.5				pla
				dec
				bne .4

				lda X.Arc.Best
				sta X.Arc.TopT,y
				tax
				stz X.Arc.TopCntL,x		Discard this entry
				stz X.Arc.TopCntH,x
				iny
				cpy #TOP.MAX
				bne .1

.6				sty X.Arc.TopTSize
				lda #0
				ldx #8					Add Top Table Size
				jsr X.Arc.AddXtYA2TBits

				ldx #0

.7				lda X.Arc.TopCntL,x
				tay
				ora X.Arc.TopCntH,x
				beq  .10

				lda X.Arc.TopCntH,x

				phx

				ldx #ARC.B.RAWTOP.W+8	add ARC.B.RAW bit
				jsr X.Arc.AddXtYA2TBits

				plx

.10				inx
				bne .7

				rts
*--------------------------------------
X.Arc.AddXtYA2TBits
				pha

				txa
				beq .9

.1				tya
				clc
				adc X.Arc.TBits
				sta X.Arc.TBits

				pla
				pha

				adc X.Arc.TBits+1
				sta X.Arc.TBits+1
				bcc .2

				inc X.Arc.TBits+2

.2				dex
				bne .1

.9				pla
				rts
*--------------------------------------
X.Arc.ComputeBLBits
				lda X.Arc.STR.Max
				beq .10

				sec
				sbc #STR.MID
				bcc .10

				bne .13

				inc

.13				jsr X.Arc.GetABitCntInX

				stx X.Arc.STR.Bits

.10				lda X.Arc.BLL.Max
				beq .40

				sec
				sbc #BLL.MID
				bcc .30

				bne .12

				inc

.12				jsr X.Arc.GetABitCntInX
				stx X.Arc.BLL.Bits

.30				>LDYA X.Arc.BLO.Max
				jsr X.Arc.GetYABitCntInX
				stx X.Arc.BLO.Bits
*--------------------------------------
.40				ldx #ARC.B.PREFIX.W+8
				>LDYA X.Arc.S.TB.Cnt
				jsr X.Arc.AddXtYA2BLBits

				ldx #8
				>LDYA X.Arc.STR.TB.Cnt
				jsr X.Arc.AddXtYA2BLBits
* SLEN
				lda X.Arc.STR.Bits
				bne .50

				ldx #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.SHORTSTR.W
				>LDYA X.Arc.STR.SL.Cnt
				jsr X.Arc.AddXtYA2BLBits
				bra .51

.50				clc
				adc #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.LEN.W
				tax
				>LDYA X.Arc.STR.LL.Cnt
				jsr X.Arc.AddXtYA2BLBits

				ldx #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.LEN.W+ARC.B.SHORTSTR.W
				>LDYA X.Arc.STR.SL.Cnt
				jsr X.Arc.AddXtYA2BLBits
* BLLEN
.51				lda X.Arc.BLL.Bits
				bne .60

				ldx #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.SHORTBLL.W
				>LDYA X.Arc.BLL.SL.Cnt
				jsr X.Arc.AddXtYA2BLBits
				bra .61

.60				clc
				adc #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.LEN.W
				tax
				>LDYA X.Arc.BLL.LL.Cnt
				jsr X.Arc.AddXtYA2BLBits

				ldx #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.LEN.W+ARC.B.SHORTBLL.W
				>LDYA X.Arc.BLL.SL.Cnt
				jsr X.Arc.AddXtYA2BLBits
* BLOFS
.61				ldx #12

.62				phx

				ldy X.Arc.BLO.LO.cnt-1,x
				lda X.Arc.BLO.HI.cnt-1,x

				ldx X.Arc.BLO.Bits

				jsr X.Arc.AddXtYA2BLBits
				plx
				dex
				bne .62

				rts

X.Arc.AddXtYA2BLBits
				pha

				txa
				beq .9

.1				tya
				clc
				adc X.Arc.BLBits
				sta X.Arc.BLBits

				pla
				pha

				adc X.Arc.BLBits+1
				sta X.Arc.BLBits+1
				bcc .2

				inc X.Arc.BLBits+2

.2				dex
				bne .1

.9				pla
				rts
*--------------------------------------
X.Arc.ComputeTBLBits
				ldy #0

.1				stz X.Arc.Cnt			Init best score to 0
				stz X.Arc.Cnt+1

				sec
				ror X.Arc.bStop

				ldx #0

.2				lda X.Arc.TopCntBLH,x
				bne .20

				lda X.Arc.TopCntBLL,x
				cmp #TOP.MIN.CNT
				bcc .3

.20				stz X.Arc.bStop

				lda X.Arc.Cnt
				cmp X.Arc.TopCntBLL,x	is it better at X
				lda X.Arc.Cnt+1
				sbc X.Arc.TopCntBLH,x
				bcs .3					not better or equal...

				stx X.Arc.Best			save new score index...

				lda X.Arc.TopCntBLL,x
				sta X.Arc.Cnt			...and value
				lda X.Arc.TopCntBLH,x
				sta X.Arc.Cnt+1

.3				inx
				bne .2

				bit X.Arc.bStop
				bmi .6

				ldx X.Arc.Best
				lda X.Arc.TOP.Widths,y
				clc
				adc #ARC.B.RAWTOP.W		add ARC.B.TOP bit

.4				pha

				lda X.Arc.TopCntBLL,x
				clc
				adc X.Arc.TBLBits
				sta X.Arc.TBLBits

				lda X.Arc.TopCntBLH,x
				adc X.Arc.TBLBits+1
				sta X.Arc.TBLBits+1
				bcc .5

				inc X.Arc.TBLBits+2

.5				pla
				dec
				bne .4

				lda X.Arc.Best
				sta X.Arc.TopTBL,y
				tax
				stz X.Arc.TopCntBLL,x	Discard this entry
				stz X.Arc.TopCntBLH,x
				iny
				cpy #TOP.MAX
				bne .1

.6				sty X.Arc.TopTBLSize
				lda #0
				ldx #8
				jsr X.Arc.AddXtYA2TBLBits

				ldx #0

.7				lda X.Arc.TopCntBLL,x
				tay
				ora X.Arc.TopCntBLH,x
				beq .10

				lda X.Arc.TopCntBLH,x

				phx

				ldx #ARC.B.RAWTOP.W+8	add ARC.B.RAW bit
				jsr X.Arc.AddXtYA2TBLBits

				plx

.10				inx
				bne .7

X.Arc.ComputeBLBits4TBL

				ldx #ARC.B.PREFIX.W		add ARC.B.SINGLE bits
				>LDYA X.Arc.S.TB.Cnt
				jsr X.Arc.AddXtYA2TBLBits
* SLEN
				lda X.Arc.STR.Bits
				bne .50

				ldx #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.SHORTSTR.W
				>LDYA X.Arc.STR.SL.Cnt
				jsr X.Arc.AddXtYA2TBLBits
				bra .51

.50				clc
				adc #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.LEN.W
				tax
				>LDYA X.Arc.STR.LL.Cnt
				jsr X.Arc.AddXtYA2TBLBits

				ldx #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.LEN.W+ARC.B.SHORTSTR.W
				>LDYA X.Arc.STR.SL.Cnt
				jsr X.Arc.AddXtYA2TBLBits
* BLLEN
.51				lda X.Arc.BLL.Bits
				bne .60

				ldx #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.SHORTBLL.W
				>LDYA X.Arc.BLL.SL.Cnt
				jsr X.Arc.AddXtYA2TBLBits
				bra .61

.60				clc
				adc #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.LEN.W
				tax
				>LDYA X.Arc.BLL.LL.Cnt
				jsr X.Arc.AddXtYA2TBLBits

				ldx #ARC.B.PREFIX.W+ARC.B.STRBL.W+ARC.B.LEN.W+ARC.B.SHORTBLL.W
				>LDYA X.Arc.BLL.SL.Cnt
				jsr X.Arc.AddXtYA2TBLBits
* BLOFS
.61				ldx #12

.62				phx

				ldy X.Arc.BLO.LO.cnt-1,x
				lda X.Arc.BLO.HI.cnt-1,x

				ldx X.Arc.BLO.Bits

				jsr X.Arc.AddXtYA2TBLBits
				plx
				dex
				bne .62

				rts
*--------------------------------------
X.Arc.AddXtYA2TBLBits
				pha

				txa
				beq .9

.1				tya
				clc
				adc X.Arc.TBLBits
				sta X.Arc.TBLBits

				pla
				pha

				adc X.Arc.TBLBits+1
				sta X.Arc.TBLBits+1
				bcc .2

				inc X.Arc.TBLBits+2

.2				dex
				bne .1

.9				pla
				rts
*--------------------------------------
X.Arc.Select	stz X.Arc.bScanBL

				ldx #0
				ldy #4

.1				lda X.Arc.Bits,y
				cmp X.Arc.Bits,x
				lda X.Arc.Bits+1,y
				sbc X.Arc.Bits+1,x
				lda X.Arc.Bits+2,y
				sbc X.Arc.Bits+2,x
				bcs .2

				tya
				tax

.2				iny
				iny
				iny
				iny
				cpy #16
				bne .1

*		ldx #4

				txa
				beq .9					CS

				lda #0

				cpx #8					< BL,TBL ?
				bcc .3					only T

				lda X.Arc.BLL.Bits
				asl
				asl
				asl
				asl
				ora X.Arc.BLO.Bits
				sta X.Arc.ShnkOut+S.ARCSHNK.TBLBITS+1

				lda X.Arc.STR.Bits
				asl
				asl
				asl
				asl
				asl
				sta X.Arc.ShnkOut+S.ARCSHNK.TBLBITS

				dec X.Arc.bScanBL

				cpx #8					only BL ?
				beq .8

				bra .5					TBL

.3				ldy X.Arc.TopTSize

.4				lda X.Arc.TopT-1,y
				sta X.Arc.ShnkOut+S.ARCSHNK.TOPBYTES-1,y
				dey
				bne .4

				lda X.Arc.TopTSize
				bra .7

.5				ldy X.Arc.TopTBLSize

.6				lda X.Arc.TopTBL-1,y
				sta X.Arc.ShnkOut+S.ARCSHNK.TOPBYTES-1,y
				dey
				bne .6

				lda X.Arc.TopTBLSize

.7				sta X.Arc.TopSize
				lsr
				tsb X.Arc.ShnkOut+S.ARCSHNK.TBLBITS
				lda #0
				ror
				tsb X.Arc.ShnkOut+S.ARCSHNK.TBLBITS+1

.8				txa						X=4,8 or 12
				lsr

				clc
				rts

.9				lda #E.BUF
*				sec
				rts
*--------------------------------------
X.Arc.Out.Init2	ldy #0

.1				lda X.Arc.ShnkOut,y
				jsr X.Arc.PutByte
				bcs .9
	
				iny
				cpy #S.ARCSHNK.TOPBYTES
				bne .1

				ldx X.Arc.TopSize
				beq .8

.2				lda X.Arc.ShnkOut,y
				jsr X.Arc.PutByte
				bcs .9

				iny
				dex
				bne .2

.8				lda #$80
				sta X.Arc.OutMask
				stz X.Arc.OutByte

				clc
.9				rts
*--------------------------------------
X.Arc.Run2		
*				>DEBUG
				bit X.Arc.bScanBL
				bmi X.Arc.Run2BLTBL

X.Arc.Run2T		inc X.Arc.nCnt
				bne .1

				inc X.Arc.nCnt+1
				beq .8					0 byte left...

.1				lda (ZPInBufPtr)
				jsr X.Arc.PutByte8
				bcs .9

				inc ZPInBufPtr
				bne X.Arc.Run2T

				inc ZPInBufPtr+1
				bra X.Arc.Run2T

.8				clc
.9				rts

X.Arc.Run2BLTBL	inc X.Arc.nCnt
				bne .1

				inc X.Arc.nCnt+1
				beq .8

.1				jsr X.Arc.ScanBL
				bcc .5

				lda X.Arc.STRLen
				bne .2

				lda ZPInBufPtr
				sta ZPStrPtr
				lda ZPInBufPtr+1
				sta ZPStrPtr+1

				inc X.Arc.STRLen
				bra .3

.2				inc
				sta X.Arc.STRLen
				cmp #STR.MAX
				bcc .3

				jsr X.Arc.PutSTR
				bcs .9

.3				inc ZPInBufPtr
				bne X.Arc.Run2BLTBL

				inc ZPInBufPtr+1

				bra X.Arc.Run2BLTBL
*--------------------------------------
.5				jsr X.Arc.PutSTR
				bcs .9

				jsr X.Arc.PutBL
				bcs .9

				lda X.Arc.BLLen
				clc
				adc ZPInBufPtr
				sta ZPInBufPtr
				bcc .6

				inc ZPInBufPtr+1

.6				lda X.Arc.BLLen
				clc
				adc X.Arc.nCnt
				sta X.Arc.nCnt
				bcc .1

				inc X.Arc.nCnt+1
				bmi .1

.8				jmp X.Arc.PutSTR

.9				rts
*--------------------------------------
X.Arc.ScanBL	lda ZPInBufPtr
				sec
				sbc #BLO.WINDOW
				tax

				lda ZPInBufPtr+1
				sbc /BLO.WINDOW
				pha
				cpx X.Arc.InBufPtr
				sbc X.Arc.InBufPtr+1
				pla
				bcs .10

				ldx X.Arc.InBufPtr		Start at beginning of Src buf
				lda X.Arc.InBufPtr+1

.10				stx ZPBackPtr
				sta ZPBackPtr+1

				stz X.Arc.BLLen			Nothing found yet

.1				lda ZPBackPtr
				sec
				sbc ZPInBufPtr
				sta X.Arc.OfsWnCnt

				lda ZPBackPtr+1
				sbc ZPInBufPtr+1
				sta X.Arc.OfsWnCnt+1	ZPBackPtr < !OfsWnCnt < ZPInBufPtr
				bcs .8					ZPBackPtr = ZPInBufPtr, exit

				>LDYA X.Arc.nCnt		make sure not going past End Buffer
				>STYA X.Arc.OfsBnCnt	while reading ahead...

				ldy #0					...or Y = BL.MAX

.2				inc X.Arc.OfsWnCnt
				bne .3

				inc X.Arc.OfsWnCnt+1
				beq .6					ZPBackPtr = ZPInBufPtr

.3				inc X.Arc.OfsBnCnt
				bne .4

				inc X.Arc.OfsBnCnt+1
				beq .6					Last Src Data

.4				lda (ZPInBufPtr),y
				cmp (ZPBackPtr),y
				bne .6					End of string matching

.5				iny
				cpy #BLL.MAX
				bne .2					Max BL len

.6				cpy #BLL.MIN
				bcc .7					not long enough

				cpy X.Arc.BLLen
				bcc .7					not better ...
*				beq .7					!!! same...but closer !!!

				sty X.Arc.BLLen
				tya
				clc
				adc ZPBackPtr
				sta X.Arc.Ofs
				lda ZPBackPtr+1
				adc #0
				sta X.Arc.Ofs+1			Make X.Arc.Ofs pointing to the END

				lda ZPInBufPtr
				sec
				sbc X.Arc.Ofs
				sta X.Arc.Ofs

				lda ZPInBufPtr+1
				sbc X.Arc.Ofs+1
				sta X.Arc.Ofs+1

.7				inc ZPBackPtr
				bne .1

				inc ZPBackPtr+1
				bra .1

.8				lda X.Arc.BLLen			exit with result flag in C
				beq .9					no BL CS

				clc

.9				rts
*--------------------------------------
X.Arc.GetYABitCntInX
				tax
				beq .2

				ldx #17					BitCnt = bc(A) + 8

.1				dex
				asl
				bcc .1

.9				rts

.2				tya						BitCnt = bc(Y)
				beq .9
*--------------------------------------
X.Arc.GetABitCntInX
				ldx #9

.1				dex
				asl
				bcc .1

				rts
*--------------------------------------
X.Arc.PutSTR	lda X.Arc.STRLen
				beq .8

				cmp #STR.MIN
				bcs .3

.1				ldx #ARC.B.PREFIX.W
				lda #ARC.B.SINGLE
				jsr X.Arc.PutXBits
				bcs .9

				lda (ZPStrPtr)
				jsr X.Arc.PutByte8
				bcs .9

				inc ZPStrPtr
				bne .2

				inc ZPStrPtr+1

.2				dec X.Arc.STRLen
				bne .1
				
*				clc

				rts
*--------------------------------------
.3				ldx #ARC.B.PREFIX.W
				lda #ARC.B.STRBL
				jsr X.Arc.PutXBits
				bcs .9

				ldx #ARC.B.STRBL.W
				lda #ARC.B.STR
				jsr X.Arc.PutXBits
				bcs .9

				lda X.Arc.STR.Bits
				beq .5

				lda X.Arc.STRLen
				cmp #STR.MID
				bcc .4

				ldx #ARC.B.LEN.W
				lda #ARC.B.LONG.B
				jsr X.Arc.PutXBits
				bcs .9

				lda X.Arc.STRLen
				sec
				sbc #STR.MID
				ldx X.Arc.STR.Bits
				jsr X.Arc.PutXBits
				bcs .9

				bra .6
*--------------------------------------
.4				ldx #ARC.B.LEN.W
				lda #ARC.B.SHORT.B
				jsr X.Arc.PutXBits
				bcs .9

.5				ldx #ARC.B.SHORTSTR.W
				lda X.Arc.STRLen
				sec
				sbc #STR.MIN
				jsr X.Arc.PutXBits
				bcs .9

.6				lda (ZPStrPtr)
				jsr X.Arc.PutByte8
				bcs .9

				inc ZPStrPtr
				bne .7

				inc ZPStrPtr+1

.7				dec X.Arc.STRLen
				bne .6

.8				clc
.9				rts
*--------------------------------------
X.Arc.PutBL		ldx #ARC.B.PREFIX.W
				lda #ARC.B.STRBL
				jsr X.Arc.PutXBits
				bcs .9

				ldx #ARC.B.STRBL.W
				lda #ARC.B.BL
				jsr X.Arc.PutXBits
				bcs .9
* BLLen
				lda X.Arc.BLL.Bits
				beq .2				no long len...

				lda X.Arc.BLLen
				cmp #BLL.MID
				bcc .1				this one is short

				ldx #ARC.B.LEN.W
				lda #ARC.B.LONG.B
				jsr X.Arc.PutXBits
				bcs .9

				lda X.Arc.BLLen
				sec
				sbc #BLL.MID
				ldx X.Arc.BLL.Bits
				jsr X.Arc.PutXBits
				bcc .3
				
.9				rts
*--------------------------------------
.1				ldx #ARC.B.LEN.W
				lda #ARC.B.SHORT.B
				jsr X.Arc.PutXBits
				bcs .9

.2				ldx #ARC.B.SHORTBLL.W
				lda X.Arc.BLLen
				sec
				sbc #BLL.MIN
				jsr X.Arc.PutXBits
				bcs .9
* BLOFS
.3				ldx X.Arc.BLO.Bits
				cpx #9
				bcc .4

				txa
*				sec
				sbc #8
				tax
				lda X.Arc.Ofs+1
				jsr X.Arc.PutXBits
				bcs .9

				ldx #8

.4				lda X.Arc.Ofs
				bra X.Arc.PutXBits
*--------------------------------------
X.Arc.PutByte8	ldy X.Arc.TopSize
				beq .4					No TOP Table

				dey						Range 0-63

.1				cmp X.Arc.ShnkOut+S.ARCSHNK.TOPBYTES,y
				beq .5

				dey
				bpl .1

				tay

				ldx #ARC.B.RAWTOP.W
				lda #ARC.B.RAW
				jsr X.Arc.PutXBits
				bcs .9

				tya

.4				ldx #8
				bra X.Arc.PutXBits

.9				rts

.5				ldx #ARC.B.RAWTOP.W
				lda #ARC.B.TOP
				jsr X.Arc.PutXBits
				bcs .9

				tya

				and X.Arc.TOP.Masks,y
				ora X.Arc.TOP.Bits,y
				ldx X.Arc.TOP.Widths,y
*--------------------------------------
X.Arc.PutXBits	phx

.1				cpx #8
				beq .2

				asl
				inx
				bra .1

.2				plx

.3				asl

				pha

				bcc .4

				lda X.Arc.OutMask
				tsb X.Arc.OutByte

.4				lsr X.Arc.OutMask
				bcc .5

				ror X.Arc.OutMask

				lda X.Arc.OutByte
				stz X.Arc.OutByte

				jsr X.Arc.PutByte

.5				pla
				bcs .9

				dex
				bne .3

*				clc

				rts

.9				lda #E.BUF

*				sec

				rts
*--------------------------------------
X.Arc.PutByte	inc X.Arc.nCntOut
				bne .1

				inc X.Arc.nCntOut+1
				beq .9

.1				sta (ZPOutBufPtr)
				inc ZPOutBufPtr
				bne .2

				inc ZPOutBufPtr+1

.2				inc X.Arc.CLen
				bne .8

				inc X.Arc.CLen+1

.8				clc
				rts

.9				lda #E.BUF
				sec
				rts
*--------------------------------------
X.Arc.Close		lda X.Arc.OutMask
				bmi .8

				lda X.Arc.OutByte
				bra X.Arc.PutByte

.8				clc
				rts
*--------------------------------------
				.DO DBG
X.Arc.PrintDBG1	>PUSHW L.MSG.DBG1

				>PUSHL X.Arc.Bits
				>PUSHL X.Arc.TBits
				>PUSHL X.Arc.BLBits
				>PUSHL X.Arc.TBLBits

				>PUSHB X.Arc.TopTSize
				>PUSHB X.Arc.TopTBLSize
				>PUSHB X.Arc.STR.Max
				>PUSHB X.Arc.BLL.Max
				>PUSHW X.Arc.BLO.Max

				>PUSHBI 22
				>SYSCALL2 PrintF
				rts

X.Arc.PrintDBG2	>PUSHW L.MSG.DBG2

				>PUSHW X.Arc.S.TB.Cnt
				>PUSHW X.Arc.STR.TB.Cnt
				>PUSHW X.Arc.BL.TB.Cnt

				>PUSHW X.Arc.STR.SL.Cnt
				>PUSHW X.Arc.STR.LL.Cnt

				>PUSHBI ARC.B.SHORTSTR.W
				>PUSHB X.Arc.STR.Bits

				>PUSHW X.Arc.BLL.SL.Cnt
				>PUSHW X.Arc.BLL.LL.Cnt

				>PUSHBI ARC.B.SHORTBLL.W
				>PUSHB X.Arc.BLL.Bits
				>PUSHB X.Arc.BLO.Bits

				ldx #0
				
.1				>PUSHB X.Arc.BLO.HI.cnt,x
				>PUSHB X.Arc.BLO.LO.cnt,x
				
				inx
				cpx #12
				bne .1

				>PUSHBI 43
				>SYSCALL2 PrintF
				rts

X.Arc.ComputeDBG3
				stz X.Arc.Bits+3
				stz X.Arc.Bits+2
				lda X.Arc.CLen+1
				sta X.Arc.Bits+1

				lda X.Arc.CLen
				asl
				rol X.Arc.Bits+1
				rol X.Arc.Bits+2
				asl
				rol X.Arc.Bits+1
				rol X.Arc.Bits+2
				asl
				rol X.Arc.Bits+1
				rol X.Arc.Bits+2
				sta X.Arc.Bits

				ldx #0

				lda X.Arc.OutMask
				bmi .3

.1				inx
				asl
				bpl .1

.2				txa
				clc
				adc X.Arc.Bits
				sta X.Arc.Bits
				bcc .3

				inc X.Arc.Bits+1
				bne .3

				inc X.Arc.Bits+2

.3				rts

X.Arc.PrintDBG3	>PUSHW L.MSG.DBG3
				>PUSHL X.Arc.Bits
				>PUSHW X.Arc.CLen
				>PUSHB X.Arc.Alg
				>PUSHBI 7
				>SYSCALL2 PrintF
				rts
				.FIN
*--------------------------------------
CS.END
*--------------------------------------
* from 1 to 12 (1 to 4095)
*--------------------------------------
BLO.LenBits		.DA #%11				bc= 1
				.DA #%11				bc= 1
				.DA #%11				bc= 3
				.DA #%11				bc= 4 : Range 0..15 (4 bits ofs)
				.DA #%10				bc= 5
				.DA #%10				bc= 6
				.DA #%10				bc= 7
				.DA #%10				bc= 8 : Range 0..255 (8 bits ofs)
				.DA #%0					bc= 9
				.DA #%0					bc=10
				.DA #%0					bc=11
				.DA #%0					bc=12 : Range 0..4095 (12 bits ofs)
*--------------------------------------
X.Arc.TOP.Masks	.DA #ARC.B.TOP0.M,#ARC.B.TOP0.M,#ARC.B.TOP0.M,#ARC.B.TOP0.M
				.DA #ARC.B.TOP0.M,#ARC.B.TOP0.M,#ARC.B.TOP0.M,#ARC.B.TOP0.M

				.DA #ARC.B.TOP8.M,#ARC.B.TOP8.M,#ARC.B.TOP8.M,#ARC.B.TOP8.M
				.DA #ARC.B.TOP8.M,#ARC.B.TOP8.M,#ARC.B.TOP8.M,#ARC.B.TOP8.M

				.DA #ARC.B.TOP16.M,#ARC.B.TOP16.M,#ARC.B.TOP16.M,#ARC.B.TOP16.M
				.DA #ARC.B.TOP16.M,#ARC.B.TOP16.M,#ARC.B.TOP16.M,#ARC.B.TOP16.M
				.DA #ARC.B.TOP16.M,#ARC.B.TOP16.M,#ARC.B.TOP16.M,#ARC.B.TOP16.M
				.DA #ARC.B.TOP16.M,#ARC.B.TOP16.M,#ARC.B.TOP16.M,#ARC.B.TOP16.M

X.Arc.TOP.Widths
				.DA #ARC.B.TOP0.W,#ARC.B.TOP0.W,#ARC.B.TOP0.W,#ARC.B.TOP0.W
				.DA #ARC.B.TOP0.W,#ARC.B.TOP0.W,#ARC.B.TOP0.W,#ARC.B.TOP0.W

				.DA #ARC.B.TOP8.W,#ARC.B.TOP8.W,#ARC.B.TOP8.W,#ARC.B.TOP8.W
				.DA #ARC.B.TOP8.W,#ARC.B.TOP8.W,#ARC.B.TOP8.W,#ARC.B.TOP8.W

				.DA #ARC.B.TOP16.W,#ARC.B.TOP16.W,#ARC.B.TOP16.W,#ARC.B.TOP16.W
				.DA #ARC.B.TOP16.W,#ARC.B.TOP16.W,#ARC.B.TOP16.W,#ARC.B.TOP16.W
				.DA #ARC.B.TOP16.W,#ARC.B.TOP16.W,#ARC.B.TOP16.W,#ARC.B.TOP16.W
				.DA #ARC.B.TOP16.W,#ARC.B.TOP16.W,#ARC.B.TOP16.W,#ARC.B.TOP16.W

X.Arc.TOP.Bits	.DA #ARC.B.TOP0.B,#ARC.B.TOP0.B,#ARC.B.TOP0.B,#ARC.B.TOP0.B
				.DA #ARC.B.TOP0.B,#ARC.B.TOP0.B,#ARC.B.TOP0.B,#ARC.B.TOP0.B

				.DA #ARC.B.TOP8.B,#ARC.B.TOP8.B,#ARC.B.TOP8.B,#ARC.B.TOP8.B
				.DA #ARC.B.TOP8.B,#ARC.B.TOP8.B,#ARC.B.TOP8.B,#ARC.B.TOP8.B

				.DA #ARC.B.TOP16.B,#ARC.B.TOP16.B,#ARC.B.TOP16.B,#ARC.B.TOP16.B
				.DA #ARC.B.TOP16.B,#ARC.B.TOP16.B,#ARC.B.TOP16.B,#ARC.B.TOP16.B
				.DA #ARC.B.TOP16.B,#ARC.B.TOP16.B,#ARC.B.TOP16.B,#ARC.B.TOP16.B
				.DA #ARC.B.TOP16.B,#ARC.B.TOP16.B,#ARC.B.TOP16.B,#ARC.B.TOP16.B
*--------------------------------------
X.Arc.nCnt		.BS 2
X.Arc.nCntOut	.BS 2
X.Arc.InBufPtr	.BS 2
X.Arc.OutBufPtr	.BS 2

X.Arc.Best		.EQ *					ComputeXXXbits
X.Arc.STRLen	.BS 1
X.Arc.BLLen		.BS 1
X.Arc.bStop		.EQ *
X.Arc.Ofs		.BS 2
X.Arc.Cnt		.EQ *
X.Arc.OfsWnCnt	.BS 2
X.Arc.OfsBnCnt	.BS 2

X.Arc.OutMask	.BS 1
X.Arc.OutByte	.BS 1

X.Arc.ShnkOut	.BS S.ARCSHNK
*--------------------------------------
X.Arc.ResetData	.EQ *

X.Arc.CLen		.BS 2
X.Arc.Alg		.BS 1

X.Arc.Bits		.BS 4
X.Arc.TBits		.BS 4
X.Arc.BLBits	.BS 4
X.Arc.TBLBits	.BS 4

X.Arc.TopT		.BS TOP.MAX
X.Arc.TopTSize	.BS 1
X.Arc.TopTBL	.BS TOP.MAX
X.Arc.TopTBLSize	.BS 1

X.Arc.S.TB.Cnt		.BS 2
X.Arc.STR.TB.Cnt	.BS 2
X.Arc.BL.TB.Cnt	.BS 2

X.Arc.STR.Max 	.BS 1
X.Arc.STR.Bits 	.BS 1
X.Arc.STR.SL.Cnt	.BS 2
X.Arc.STR.LL.Cnt	.BS 2

X.Arc.TopSize	.BS 1
X.Arc.bScanBL	.BS 1

X.Arc.BLL.Max 	.BS 1
X.Arc.BLL.Bits 	.BS 1
X.Arc.BLL.SL.Cnt	.BS 2
X.Arc.BLL.LL.Cnt	.BS 2

X.Arc.BLO.Max 	.BS 2
X.Arc.BLO.Bits 	.BS 1

X.Arc.BLO.LO.cnt	.BS 12
X.Arc.BLO.HI.cnt	.BS 12

X.Arc.ResetCnt	.EQ *-X.Arc.ResetData
*--------------------------------------
X.Arc.TopCntL	.BS 256
X.Arc.TopCntH	.BS 256
X.Arc.TopCntBLL	.BS 256
X.Arc.TopCntBLH	.BS 256
*--------------------------------------
MAN
SAVE usr/src/shared/x.arc.s
LOAD usr/src/bin/arc.s
ASM