2019-09-24 15:25:07 +00:00
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NEW
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AUTO 3,1
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.LIST OFF
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*--------------------------------------
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* ZPInBufPtr = Ptr to Shunk Data
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* Header : 16 SHORT4
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* 8 SHORT3
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* ZPOutBufPtr = Ptr to Uncompressed Data
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* ZPULen = Uncompressed length
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*--------------------------------------
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* ZPPtr1
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* ZPPtr2
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* ZPnCnt = !ZPULen
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* ZPInMask
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* ZPOutLastByte
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*-OLD----------------------------------
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* SHORT3 : 0 xxx
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* SHORT4 : 10 xxxx
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* REPn : 110 xxxx (1-16)
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* BACKLINK : 1110 oooooooo OO llllll (3-66)
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* STOREn : 1111 xxxx (1-16)
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*--------------------------------------
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X.Unpak lda ZPInBufPtr
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clc
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adc #24 skip SHORT4 & SHORT3
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sta ZPPtr1
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lda ZPInBufPtr+1
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adc #0
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sta ZPPtr1+1
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lda ZPULen
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eor #$ff
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sta ZPnCnt
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lda ZPULen+1
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eor #$ff
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sta ZPnCnt+1
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lda #$80
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sta ZPInMask
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.1 lda ZPnCnt
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ora ZPnCnt+1
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bne .2
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clc
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rts
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*--------------------------------------
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.2 jsr X.Unpak.GetBitInC
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bcs .3
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* SHORT3 : 0 xxx
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ldx #3
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jsr X.Unpak.GetXBitInA
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ora #$16 Skip SHORT4 (16 bytes)
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bra .31
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*--------------------------------------
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.3 jsr X.Unpak.GetBitInC
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bcs .4
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* SHORT4 : 10 xxxx
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ldx #4
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jsr X.Unpak.GetXBitInA
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.31 tay
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lda (ZPInBufPtr),y
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jsr X.Unpak.PutByte
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bne .2
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clc
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rts
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*--------------------------------------
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.4 jsr X.Unpak.GetBitInC
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bcs .5
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* REPn : 110 xxxx
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ldx #4
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jsr X.Unpak.GetXBitInA
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tay
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lda ZPOutLastByte
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.41 jsr X.Unpak.PutByte.1
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beq .99
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dey
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bpl .41 +1
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bra .1
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.99 sec
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rts
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*--------------------------------------
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.5 jsr X.Unpak.GetBitInC
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bcs .6
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* BACKLINK : 1110 oooooooo OO llllll
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jsr X.Unpak.GetByteInA
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clc
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adc ZPOutBufPtr
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sta ZPPtr2
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php
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ldx #2
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jsr X.Unpak.GetXBitInA
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plp
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adc ZPOutBufPtr+1
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sta ZPPtr2+1
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jsr X.Unpak.GetByteInA
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inc +1
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inc +1
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* inc +1
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tay
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.51 lda (ZPPtr2),y
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jsr X.Unpak.PutByte
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beq .99
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dey
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bpl .51 +1
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bra .1
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*--------------------------------------
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* STOREn : 1111 cccc Byte Byte Byte ...
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.6 ldx #4
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jsr X.Unpak.GetXBitInA
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tay
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.61 jsr X.Unpak.GetByteInA
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jsr X.Unpak.PutByte
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beq .99
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dey
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bpl .61 +1
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bra .1
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.9 sec
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rts
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*-NEW----------------------------------
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2019-09-24 15:33:18 +00:00
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* STRINGn : 0 xxxx
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2019-09-24 15:25:07 +00:00
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* {
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* BYTE8 : 0 xxxxxxxx
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2019-09-24 15:33:18 +00:00
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* SHORT8 : 10 xxx
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* SHORT16 : 110 xxxx
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* REPn : 111 xxxx (1-16)
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2019-09-24 15:25:07 +00:00
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* }
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* BACKLINK : 1 oooooooo OOOO llllll (3-66)
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*--------------------------------------
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X.Unpak2 lda ZPInBufPtr
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clc
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2019-09-24 15:33:18 +00:00
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adc #24 skip SHORTs
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2019-09-24 15:25:07 +00:00
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sta ZPPtr1
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lda ZPInBufPtr+1
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adc #0
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sta ZPPtr1+1
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lda ZPULen
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eor #$ff
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sta ZPnCnt
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lda ZPULen+1
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eor #$ff
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sta ZPnCnt+1
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lda #$80
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sta ZPInMask
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.1 lda ZPnCnt
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ora ZPnCnt+1
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bne .2
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clc
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rts
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*--------------------------------------
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.2 jsr X.Unpak.GetBitInC
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bcs .3
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* SHORT3 : 0 xxx
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ldx #3
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jsr X.Unpak.GetXBitInA
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ora #$16 Skip SHORT4 (16 bytes)
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bra .31
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*--------------------------------------
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.3 jsr X.Unpak.GetBitInC
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bcs .4
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* SHORT4 : 10 xxxx
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ldx #4
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jsr X.Unpak.GetXBitInA
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.31 tay
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lda (ZPInBufPtr),y
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jsr X.Unpak.PutByte
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bne .2
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clc
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rts
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*--------------------------------------
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.4 jsr X.Unpak.GetBitInC
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bcs .5
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* REPn : 110 xxxx
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ldx #4
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jsr X.Unpak.GetXBitInA
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tay
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lda ZPOutLastByte
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.41 jsr X.Unpak.PutByte.1
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beq .99
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dey
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bpl .41 +1
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bra .1
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.99 sec
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rts
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*--------------------------------------
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.5 jsr X.Unpak.GetBitInC
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bcs .6
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* BACKLINK : 1110 oooooooo OO llllll
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jsr X.Unpak.GetByteInA
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clc
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adc ZPOutBufPtr
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sta ZPPtr2
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php
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ldx #2
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jsr X.Unpak.GetXBitInA
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plp
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adc ZPOutBufPtr+1
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sta ZPPtr2+1
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jsr X.Unpak.GetByteInA
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inc +1
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inc +1
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* inc +1
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tay
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.51 lda (ZPPtr2),y
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jsr X.Unpak.PutByte
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beq .99
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dey
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bpl .51 +1
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bra .1
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*--------------------------------------
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* STOREn : 1111 cccc Byte Byte Byte ...
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.6 ldx #4
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jsr X.Unpak.GetXBitInA
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tay
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.61 jsr X.Unpak.GetByteInA
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jsr X.Unpak.PutByte
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beq .99
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dey
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bpl .61 +1
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bra .1
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.9 sec
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rts
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*--------------------------------------
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X.Unpak.GetByteInA
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ldx #8
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X.Unpak.GetXBitInA
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lda #0
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.1 jsr X.Unpak.GetBitInC
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rol
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dex
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bne .1
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rts
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*--------------------------------------
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X.Unpak.GetBitInC
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pha
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clc
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lda (ZPPtr1)
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and ZPInMask
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beq .1
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sec
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.1 php
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lsr ZPInMask
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bne .8
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ror ZPInMask
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inc ZPPtr1
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bne .8
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inc ZPPtr1+1
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.8 plp
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pla
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rts
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*--------------------------------------
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X.Unpak.PutByte sta ZPOutLastByte
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X.Unpak.PutByte.1
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sta (ZPOutBufPtr)
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inc ZPOutBufPtr
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bne .1
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inc ZPOutBufPtr+1
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.1 inc ZPnCnt
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bne .2
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inc ZPnCnt+1
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.2 rts
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*--------------------------------------
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.LIST ON
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X.Unpak.Size .EQ *-X.Unpak
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.LIST OFF
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*--------------------------------------
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MAN
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SAVE USR/SRC/SHARED/X.UNPAK.S
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LOAD USR/SRC/BIN/UNPAK.S
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ASM
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