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A2osX/SHARED/X.UNARC.S.txt
burniouf e65065228c ProDOS.FX 8M (required for KRNL8M)
2023-11-04 15:42:28 +01:00

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NEW
AUTO 3,1
*--------------------------------------
* ZPInBufPtr = Ptr to Shunk Data
* ZPOutBufPtr = Ptr to Uncompressed Data
*--------------------------------------
* ZPnCnt = !ZPULen
* ZPPtr1
* ZPPtr2
* ZPInMask
* ZPSTRLenBits
* ZPBLLenBits
* ZPBLOfsLBits
* ZPBLOfsHBits
* ZPTOPCnt
*--------------------------------------
X.UnArc jsr X.UnArc.GetByte ULEN LO
eor #$ff
sta ZPnCnt
jsr X.UnArc.GetByte ULEN HI
eor #$ff
sta ZPnCnt+1
jsr X.UnArc.GetByte TBLBITS LO
sta ZPPtr1
jsr X.UnArc.GetByte TBLBITS HI
sta ZPPtr1+1
ora ZPPtr1
bne X.UnArc.ARC
*--------------------------------------
X.UnArc.STORE ldx ZPnCnt !LEN LO
ldy #0
.1 inx
bne .2
inc ZPnCnt+1
beq .8
.2 lda (ZPInBufPtr),y
sta (ZPOutBufPtr),y
iny
bne .1
inc ZPInBufPtr+1
inc ZPOutBufPtr+1
bra .1
.8 clc
rts
*--------------------------------------
X.UnArc.ARC lda #$80
sta ZPTOPCnt Default to no TOP bytes...
sta ZPSTRLenBits ...and no long length for STR...
sta ZPBLLenBits ...and BL
sta ZPInMask Init Bit shifter
lda ZPPtr1+1
and #%01111111 -llloooo
beq .13 no BL/STR
lsr
lsr
lsr
lsr
sta ZPBLLenBits lll
lda ZPPtr1+1 ----oooo
and #%00001111
ldx #0
cmp #8
bcc .10
* sec
sbc #8
tax
lda #8
.10 sta ZPBLOfsLBits
stx ZPBLOfsHBits
lda ZPPtr1 sss-----
lsr
lsr
lsr
lsr
lsr
beq .13
sta ZPSTRLenBits
.13 lda ZPPtr1+1 c-------
asl
lda ZPPtr1 ---ccccc
and #%00011111
rol
beq X.UnArc.ARC.LOOP
sta ZPTOPCnt
ldx ZPInBufPtr ZPPtr1 = TOP table
stx ZPPtr1
ldx ZPInBufPtr+1
stx ZPPtr1+1
clc
adc ZPInBufPtr skip TOP table
sta ZPInBufPtr
bcc X.UnArc.ARC.LOOP
inc ZPInBufPtr+1
*--------------------------------------
X.UnArc.ARC.LOOP
bit ZPSTRLenBits
bpl X.UnArc.ARC.LOOPBL
.1 jsr X.UnArc.Single
bne .1
clc
rts
*--------------------------------------
X.UnArc.ARC.LOOPBL
jsr X.UnArc.GetBitInC
bcs .60 -> STRBL
jsr X.UnArc.Single
bne X.UnArc.ARC.LOOPBL
clc
rts
*--------------------------------------
* STRBL
*--------------------------------------
.60 jsr X.UnArc.GetBitInC
bcs .70 -> BL
*--------------------------------------
* STR
*--------------------------------------
* bit ZPSTRLenBits
* bmi .63 no long len
jsr X.UnArc.GetBitInC
bcs .61 -> Long Len
.63 ldx #ARC.B.SHORTSTR.W
jsr X.UnArc.GetXBitInA
clc
adc #STR.MIN
bra .62
.61 ldx ZPSTRLenBits
jsr X.UnArc.GetXBitInA
clc
adc #STR.MID
.62 pha STR len
jsr X.UnArc.Single
pla
dec
bne .62
.81 bra .80
*--------------------------------------
* BL
*--------------------------------------
.70 bit ZPBLLenBits
bmi .73 no long len
jsr X.UnArc.GetBitInC
bcs .71 -> Long Len
.73 ldx #ARC.B.SHORTBLL.W
jsr X.UnArc.GetXBitInA
clc
adc #BLL.MIN
bra .72
*--------------------------------------
.71 ldx ZPBLLenBits
jsr X.UnArc.GetXBitInA
clc
adc #BLL.MID
.72 sta ZPPtr2 save BL Len....
* BLOFS
pha
ldy #0
ldx ZPBLOfsHBits
beq .75
jsr X.UnArc.GetXBitInA
tay
.75 jsr X.UnArc.Get8BitInA YA=Offset
clc
adc ZPPtr2 ZPPtr2=BL Len+Offset
sta ZPPtr2
tya
adc #0
sta ZPPtr2+1
lda ZPOutBufPtr
sec
sbc ZPPtr2
sta ZPPtr2
lda ZPOutBufPtr+1
sbc ZPPtr2+1
sta ZPPtr2+1
plx Get Back BL Len
ldy #0
.76 lda (ZPPtr2),y
jsr X.UnArc.PutByte
iny
dex
bne .76
.80 lda ZPnCnt
and ZPnCnt+1
inc
beq .88
jmp X.UnArc.ARC.LOOPBL
.88 clc
rts
*--------------------------------------
X.UnArc.Single bit ZPTOPCnt
bmi .1 no TOP Table
jsr X.UnArc.GetBitInC
bcs .3 ->TOP0
*--------------------------------------
* RAW
*--------------------------------------
.1 jsr X.UnArc.Get8BitInA
bra X.UnArc.PutByte
*--------------------------------------
.3 jsr X.UnArc.GetBitInC
bcs .4 ->TOP8
*--------------------------------------
* TOP0/4
*--------------------------------------
ldx #ARC.B.TOP0.W-1
jsr X.UnArc.GetXBitInA
bra .51
*--------------------------------------
.4 jsr X.UnArc.GetBitInC
bcs .5 ->TOP16
*--------------------------------------
* TOP8
*--------------------------------------
ldx #ARC.B.TOP8.W-2
jsr X.UnArc.GetXBitInA
ora #%1000
bra .51
*--------------------------------------
* TOP16
*--------------------------------------
.5 ldx #ARC.B.TOP16.W-2
jsr X.UnArc.GetXBitInA
ora #%10000
.51 tay
lda (ZPPtr1),y
*--------------------------------------
* fall in PutByte
*--------------------------------------
X.UnArc.PutByte inc ZPnCnt
bne .1
inc ZPnCnt+1
beq .8
.1 sta (ZPOutBufPtr)
inc ZPOutBufPtr
bne .8
inc ZPOutBufPtr+1
.8 rts
*--------------------------------------
X.UnArc.Get8BitInA
ldx #8
X.UnArc.GetXBitInA
lda #0
.1 pha
jsr X.UnArc.GetBitInC
pla
rol
dex
bne .1
rts
*--------------------------------------
X.UnArc.GetBitInC
lda (ZPInBufPtr)
and ZPInMask
cmp #1 CC if bit=0
php
lsr ZPInMask
bcc .8
ror ZPInMask
jsr X.UnArc.NextByte
.8 plp
rts
*--------------------------------------
X.UnArc.GetByte lda (ZPInBufPtr)
X.UnArc.NextByte
inc ZPInBufPtr
bne .8
inc ZPInBufPtr+1
.8 rts
*--------------------------------------
.LIST ON
X.UnArc.Size .EQ *-X.UnArc
.LIST OFF
*--------------------------------------
MAN
SAVE usr/src/shared/x.unarc.s
LOAD usr/src/bin/unarc.s
ASM
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