NEW 
  AUTO 3,1
				.LIST OFF	
				.OP	65C02
				.OR	$2000
				.TF lib/libpak
*--------------------------------------
				.INB inc/macros.i
				.INB inc/a2osx.i
				.INB inc/libpak.i
*--------------------------------------
STATS			.EQ 0
*--------------------------------------
ZPSrcPtr		.EQ ZPLIB
ZPDstPtr		.EQ ZPLIB+2
ZPStatPtr		.EQ ZPLIB+4
ZPSrcBLPtr		.EQ ZPLIB+6
ZPCnt			.EQ ZPLIB+8
ZPBLCnt			.EQ ZPLIB+10
*--------------------------------------
*			File Header (16 Bytes)
*--------------------------------------
CS.START		cld
				jmp (.1,x)
				.DA #$61				6502,Level 1 (65c02)
				.DA #1					BIN Layout Version 1
				.DA 0
				.DA CS.END-CS.START
				.DA 0
				.DA 0
				.DA 0
*--------------------------------------
* Relocation Table
*--------------------------------------
.1				.DA LIB.LOAD
				.DA LIB.UNLOAD
				.DA Pak
				.DO STATS=1
L.MSG.Stats		.DA MSG.Stats
L.MSG.TopBytes	.DA MSG.TopBytes
				.FIN
				.DA 0
*--------------------------------------
LIB.LOAD
LIB.UNLOAD		clc
				rts
*/--------------------------------------
* # Pak
* ##ASM 
* `>PUSHW StatPtr`
* `>PUSHW DstPtr`
* `>PUSHW SrcLen`
* `>PUSHW SrcPtr`
* `>LIBCALL hLIBPAK,Pak`
* ## RETURN VALUE 
* CC, Y,A = CLEN
* CS, Pak failure
*\--------------------------------------
Pak				>PULLW Pak.SrcPtr
				>PULLW Pak.Shnk+S.PAKSHNK.ULEN
				>PULLW ZPDstPtr
				>PULLW ZPStatPtr

* Reset Byte counters

				ldx #0

.1				stz	Pak.CntL,x
				stz Pak.CntH,x
				inx
				bne .1
				
				ldx #S.PAKSTAT.PASS2+1
				
.2				stz Pak.Stat,x			Reset Stats			
				dex
				bpl .2

* PASS #1 : no store, update byte counters

				stz Pak.bPass2
								
				jsr Pak.Out.Init		Initialize properly for first "PutBit" Call
				bcs .9

				jsr Pak.Run

				jsr Pak.ComputeLenBits
				jsr Pak.BuildTOPTable

				.DO STATS=1
				jsr Pak.PrintStats
				.FIN
				
* PASS #2 : store with TOP bytes

				dec Pak.bPass2
				
				jsr Pak.Out.Init		Initialize properly for first "PutBit" Call
				bcs .9

				jsr Pak.Run
				bcs .9

				jsr Pak.Out.Close
				bcs .9

				ldy #S.PAKSTAT-1
				
.7				lda Pak.Stat,y
				sta (ZPStatPtr),y
				dey
				bpl .7

				.DO STATS=1
				jsr Pak.PrintStats
				.FIN
				>LDYA Pak.Stat+S.PAKSTAT.PASS2
				clc

				.DO STATS=1
				rts
				.FIN
				
.9
				.DO STATS=1
				jsr Pak.PrintStats
				sec
				.FIN
				
				rts		
*--------------------------------------
Pak.Out.Init	lda Pak.Shnk+S.PAKSHNK.ULEN
				eor #$ff
				sta Pak.SrcCnt
				sta Pak.DstCnt
				
				lda Pak.Shnk+S.PAKSHNK.ULEN+1
				eor #$ff
				sta Pak.SrcCnt+1
				sta Pak.DstCnt+1

				bit Pak.bPass2
				bpl .8
				
				lda Pak.Shnk+S.PAKSHNK.BLBITS
				jsr Pak.Out.PutByte
				bcs .9

				lda Pak.Shnk+S.PAKSHNK.ULEN
				jsr Pak.Out.PutByte
				bcs .9

				lda Pak.Shnk+S.PAKSHNK.ULEN+1
				jsr Pak.Out.PutByte
				bcs .9

				lda Pak.Shnk+S.PAKSHNK.TOPCNT
				jsr Pak.Out.PutByte
				bcs .9
				
				tax
				
				ldy #0
				
.1				lda Pak.Shnk+S.PAKSHNK.TOPBYTES,y
				jsr Pak.Out.PutByte
				bcs .9

				iny
				dex
				bne .1
				
				lda #$80
				sta Pak.Out.Mask
				stz Pak.Out.Byte

.8				clc				
.9				rts
*--------------------------------------
Pak.Run			>LDYA Pak.SrcPtr
				>STYA ZPSrcPtr
				
				stz Pak.BL.Longest
				stz Pak.BL.Farest
				stz Pak.BL.Farest+1

				ldx #S.PAKSTAT.TOP8
				
.1				stz Pak.Stat,x			Reset Stats
				inx
				cpx #S.PAKSTAT
				bne .1

Pak.Run.1		inc Pak.SrcCnt
				bne .1
				
				inc Pak.SrcCnt+1
				beq .8					0 byte left...
				
.1				jsr Pak.ScanBL
				bcs .20

				jsr Pak.PutBL
				bcs .9
				
				ldy Pak.BestBLLen

.6				tya
				clc
				adc ZPSrcPtr
				sta ZPSrcPtr
				bcc .7
				inc ZPSrcPtr+1
				
.7				tya
				clc
				adc Pak.SrcCnt
				sta Pak.SrcCnt
				bcc .1
				inc Pak.SrcCnt+1
				bmi .1
				
.8				clc
			
.9				rts

.20				lda (ZPSrcPtr)			Not found...
				jsr Pak.PutByte8
				bcs .9
				
				inc ZPSrcPtr
				bne Pak.Run.1
				inc ZPSrcPtr+1
				bra Pak.Run.1				
*--------------------------------------
Pak.ScanBL		>LDYA Pak.SrcPtr		Start at beginning of Src buf
				>STYA ZPSrcBLPtr

				lda #$ff
				sta Pak.bBLFound
				stz Pak.BestBLLen
				
.1				lda ZPSrcBLPtr
				sec
				sbc ZPSrcPtr
				sta ZPBLCnt
				
				lda ZPSrcBLPtr+1
				sbc ZPSrcPtr+1
				sta ZPBLCnt+1			ZPSrcBLPtr < !BlCnt < ZPSrcPtr 
				bcs .8					ZPSrcBLPtr = ZPSrcPtr, exit
				
				>LDYA Pak.SrcCnt		make sure not going past End Buffer
				>STYA ZPCnt				while reading ahead
				
				ldy #0					...or Y = BL.MAX
				
.2				inc ZPBLCnt
				bne .3
				
				inc ZPBLCnt+1
				beq .6					ZPSrcBLPtr = ZPSrcPtr	
				
.3				inc ZPCnt
				bne .4

				inc ZPCnt+1
				beq .6					Last Src Data
				
.4				lda (ZPSrcPtr),y
				cmp (ZPSrcBLPtr),y
				bne .6					End of string matching
				
.5				iny
				cpy #BL.MAX
				bne .2					Max BL len
				
.6				cpy #BL.MIN
				bcc .7					not long enough

				cpy Pak.BestBLLen
				bcc .7					not better ...
*				beq .7					!!! same...but closer !!!
				
				sty Pak.BestBLLen

				lda ZPSrcPtr
				sec
				sbc ZPSrcBLPtr
				sta Pak.BestBL

				lda ZPSrcPtr+1
				sbc ZPSrcBLPtr+1
				sta Pak.BestBL+1

				stz Pak.bBLFound
	
.7				inc ZPSrcBLPtr
				bne .1
				inc ZPSrcBLPtr+1
				bra .1

.8				rol Pak.bBLFound

				rts
*--------------------------------------
Pak.ComputeLenBits
				ldx #0
				lda Pak.BL.Longest
				beq .10

				ldx #3
				
				dec
				dec
				dec
				beq .10

				ldx #8
				
.1				asl
				bcs .10
				dex
				bra .1
				
.10				stx Pak.BL.LenBits

				ldx #0
				ldy #0
				
				lda Pak.BL.Farest+1
				beq .22
					
				ldy #8
				ldx #8
				
.2				asl
				bcs .4
				dey
				bra .2
				
.22				lda Pak.BL.Farest
				beq .4
				
				ldx #8
				
.3				asl
				bcs .4
				dex
				bra .3

.4				stx Pak.BL.OfsBitsL
				sty Pak.BL.OfsBitsH
				
				lda Pak.BL.LenBits
				asl
				asl
				asl
				asl
				
				adc Pak.BL.OfsBitsL
				adc Pak.BL.OfsBitsH
				ora #$80
				sta Pak.Shnk+S.PAKSHNK.BLBITS

				rts
*--------------------------------------
Pak.BuildTOPTable
				ldy #0

.1				stz Pak.Cnt				Init best score to 0
				stz Pak.Cnt+1
				
				sec
				ror Pak.bStop
				
				ldx #0
				
.2				lda Pak.CntL,x
				ora Pak.CntH,x
				beq .3

				stz Pak.bStop

				lda Pak.Cnt
				cmp Pak.CntL,x			is it better at X
				lda Pak.Cnt+1
				sbc Pak.CntH,x
				bcs .3					not better or equal...
				
				stx Pak.Top.Best		save new score index...
				
				lda Pak.CntL,x
				sta Pak.Cnt				...and value
				lda Pak.CntH,x
				sta Pak.Cnt+1
				
.3				inx
				bne .2
				
				bit Pak.bStop
				bmi .8
				
				lda Pak.Top.Best
				sta Pak.Shnk+S.PAKSHNK.TOPBYTES,y
				tax
				stz Pak.CntL,x			Discard this entry
				stz Pak.CntH,x
				iny
				cpy #TOP.MAX
				bne .1
				
.8				sty Pak.Shnk+S.PAKSHNK.TOPCNT
Pak.BuildTOPTable.RTS				
				rts
*--------------------------------------
Pak.PutBL		ldx #S.PAKSTAT.BL
				jsr Pak.UpdateStats
				
				lda Pak.BestBLLen
				cmp Pak.BL.Longest
				bcc .1
				
				sta Pak.BL.Longest
				
.1				ldy Pak.BestBL
				cpy Pak.BL.Farest
				
				lda Pak.BestBL+1
				pha
				sbc Pak.BL.Farest+1
				pla
				bcc .2
	
				>STYA Pak.BL.Farest
				
.2				bit Pak.bPass2
				bmi .3
	
				ldx #S.PAKSTAT.PASS1	Assume 1 BL worse case is 3 bytes
				jsr Pak.UpdateStats
				jsr Pak.UpdateStats
				jsr Pak.UpdateStats
				clc
				rts
				
.3				ldy #PAK.B.BL.W
				lda #PAK.B.BL
				jsr Pak.Out.PutYBits
				bcs Pak.BuildTOPTable.RTS
				
				ldy Pak.BL.OfsBitsL
				lda Pak.BestBL
				jsr Pak.Out.PutYBits
				bcs Pak.BuildTOPTable.RTS
				
				ldy Pak.BL.OfsBitsH
				beq .4
				
				lda Pak.BestBL+1
				jsr Pak.Out.PutYBits
				bcs Pak.BuildTOPTable.RTS
				
.4				ldy Pak.BL.LenBits
				lda Pak.BestBLLen
				dec
				dec
				dec
				jmp Pak.Out.PutYBits
*--------------------------------------
Pak.PutByte8	bit Pak.bPass2
				bmi Pak.PutByte8.2
				
.5				tax
				inc Pak.CntL,x
				bne .6

				inc Pak.CntH,x
				
.6				ldx #S.PAKSTAT.BYTE8
				jsr Pak.UpdateStats
				
				ldx #S.PAKSTAT.PASS1
				jsr Pak.UpdateStats
				
				clc
				rts
				
Pak.PutByte8.2	ldy Pak.Shnk+S.PAKSHNK.TOPCNT
				beq .2				No TOP Table

.1				cmp Pak.Shnk+S.PAKSHNK.TOPBYTES-1,y
				beq .3
				dey
				bne .1

.2				ldx #S.PAKSTAT.BYTE8
				jsr Pak.UpdateStats
				
				pha
				ldy #PAK.B.BYTE8.W
				lda #PAK.B.BYTE8
				jsr Pak.Out.PutYBits
				pla
				bcs .9
				
				ldy #8
				jmp Pak.Out.PutYBits
				
.3				dey						Range 0-31
				
				tya
				lsr
				lsr
				lsr
				tax						Range 0-3

				tya
				and #7
				ora TOP.Bits,x
				ldy TOP.BitCnt,x

.4				pha

				lda TOP.Stat,x
				tax
				jsr Pak.UpdateStats

				pla
				jmp Pak.Out.PutYBits
				
.9				rts				
*--------------------------------------
Pak.Out.Close	bit Pak.Out.Mask
				bmi .8

				lda Pak.Out.Byte
				bra Pak.Out.PutByte

.8				clc
				rts
*--------------------------------------
Pak.Out.PutYBits
				phy
				
.1				cpy #8
				beq .2

				asl
				iny
				bra .1
				
.2				ply

.3				asl

				pha

				bcc .4

				lda Pak.Out.Mask
				tsb Pak.Out.Byte

.4				lsr Pak.Out.Mask
				bcc .5

				ror Pak.Out.Mask

				lda Pak.Out.Byte
				stz Pak.Out.Byte

				jsr Pak.Out.PutByte

.5				pla
				bcs .9

				dey
				bne .3

*				clc

				rts
				
.9				lda #E.BUF
				sec
				rts				
*--------------------------------------
Pak.Out.PutByte	inc Pak.DstCnt
				bne .1

				inc Pak.DstCnt+1
				beq .9

.1				sta (ZPDstPtr)

				inc ZPDstPtr
				
				bne .2
				
				inc ZPDstPtr+1

.2				inc Pak.Stat+S.PAKSTAT.PASS2
				bne .8

				inc Pak.Stat+S.PAKSTAT.PASS2+1

.8				clc
				rts

.9				lda #E.BUF
				sec
				rts
*--------------------------------------
Pak.UpdateStats	inc Pak.Stat,x
				bne .8
				inc Pak.Stat+1,x
.8				rts
*--------------------------------------
				.DO STATS=1
Pak.PrintStats	lda Pak.BL.OfsBitsL
				clc
				adc Pak.BL.OfsBitsH
				>PUSHA

				>PUSHW Pak.BL.Farest
				>PUSHB Pak.BL.LenBits
				>PUSHB Pak.BL.Longest
				>PUSHW Pak.Stat+S.PAKSTAT.BL
				
				ldx #S.PAKSTAT.BYTE8

.1				>PUSHW Pak.Stat,x
				dex
				dex
				bpl .1
				
				>PUSHW Pak.Shnk+S.PAKSHNK.ULEN
				
				>PUSHBI 23
				>LDYA L.MSG.Stats
				>SYSCALL PrintF
				
				ldx #TOP.MAX-1
				
.2				>PUSHB Pak.Shnk+S.PAKSHNK.TOPBYTES,x
				dex
				bpl .2
				
				>PUSHB Pak.Shnk+S.PAKSHNK.TOPCNT
				
				>PUSHBI TOP.MAX+1
				>LDYA L.MSG.TopBytes
				>SYSCALL PrintF
				
				bit Pak.bPass2
				bpl .9
				>DEBUG
				
.9				rts
				.FIN
*--------------------------------------
CS.END
*--------------------------------------
				.DO STATS=1
MSG.Stats		.CS "\r\nLength : %5D\r\n"
				.CS "Pass 1 : %5D\r\n"
				.CS "Pass 2 : %5D\r\n"
				.CS "Top  8 : %5D\r\n"
				.CS "Top 16 : %5D\r\n"
				.CS "Top 24 : %5D\r\n"
				.CS "Top 32 : %5D\r\n"
				.CS "Byte 8 : %5D\r\n"
				.CZ "BL     : %5D, Longest : %d (%d bits), Farest : %D (%d bits)\r\n"
MSG.TopBytes	.CS "Top    : (%2d) %h.%h.%h.%h.%h.%h.%h.%h %h.%h.%h.%h.%h.%h.%h.%h\r\n"
				.CZ "              %h.%h.%h.%h.%h.%h.%h.%h %h.%h.%h.%h.%h.%h.%h.%h\r\n"
				.FIN
TOP.Bits		.DA #PAK.B.TOP8,#PAK.B.TOP16,#PAK.B.TOP24,#PAK.B.TOP32
TOP.BitCnt		.DA #PAK.B.TOP8.W,#PAK.B.TOP16.W,#PAK.B.TOP24.W,#PAK.B.TOP32.W
TOP.Stat		.DA #S.PAKSTAT.TOP8,#S.PAKSTAT.TOP16,#S.PAKSTAT.TOP24,#S.PAKSTAT.TOP32
*--------------------------------------
Pak.SrcPtr		.BS 2

Pak.SrcCnt		.BS 2
Pak.DstCnt		.BS 2

Pak.bPass2		.BS 1

Pak.BL.Longest	.BS 1
Pak.BL.Farest	.BS 2

Pak.BL.LenBits	.BS 1
Pak.BL.OfsBitsL	.BS 1
Pak.BL.OfsBitsH	.BS 1

Pak.bBLFound	.BS 1
Pak.BestBLLen	.BS 1
Pak.BestBL		.BS 2

Pak.Top.Best	.BS 1

Pak.Cnt			.BS 2
Pak.bStop		.BS 1

Pak.Out.Byte	.BS 1
Pak.Out.Mask	.BS 1
*--------------------------------------
Pak.CntL		.BS 256
Pak.CntH		.BS 256
Pak.Shnk		.BS S.PAKSHNK
Pak.Stat		.BS S.PAKSTAT
*--------------------------------------
MAN
SAVE usr/src/lib/libpak.s
ASM