mirror of https://github.com/A2osX/A2osX.git
246 lines
4.0 KiB
Plaintext
246 lines
4.0 KiB
Plaintext
NEW
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AUTO 3,1
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*--------------------------------------
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* ZPInBufPtr = Ptr to Shunk Data
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* ZPOutBufPtr = Ptr to Uncompressed Data
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*--------------------------------------
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* ZPnCnt = !ZPULen
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* ZPPtr1
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* ZPPtr2
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* ZPInMask,ZPBLOfsLBits,ZPBLOfsHBits,ZPBLLenBits
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*--------------------------------------
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X.Unpak jsr X.Unpak.GetByte CHNK.DATA.T
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tax
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bne X.Unpak.PAK
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*--------------------------------------
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X.Unpak.STORE jsr X.Unpak.GetULEN
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ldx ZPnCnt !LEN LO
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ldy #0
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.1 inx
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bne .2
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inc ZPnCnt+1
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beq .8
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.2 lda (ZPInBufPtr),y
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sta (ZPOutBufPtr),y
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iny
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bne .1
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inc ZPInBufPtr+1
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inc ZPOutBufPtr+1
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bra .1
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.8 clc
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rts
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*--------------------------------------
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X.Unpak.PAK pha A = BLBITS
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and #$70
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lsr
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lsr
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lsr
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lsr
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sta ZPBLLenBits
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pla
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and #$0f
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ldx #0
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cmp #8
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bcc .10
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and #7
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tax
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lda #8
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.10 sta ZPBLOfsLBits
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stx ZPBLOfsHBits
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jsr X.Unpak.GetULEN
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jsr X.Unpak.GetByte get TOPCNT
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ldx ZPInBufPtr ZPPtr1 = TOP table
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stx ZPPtr1
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ldx ZPInBufPtr+1
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stx ZPPtr1+1
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clc
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adc ZPInBufPtr skip TOP table
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sta ZPInBufPtr
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bcc .11
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inc ZPInBufPtr+1
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.11 lda #$80
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sta ZPInMask
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*--------------------------------------
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.2 jsr X.Unpak.GetBitInC
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bcs .3 ->TOP
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* BYTE8
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ldx #8
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jsr X.Unpak.GetXBitInA
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bra .52
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*--------------------------------------
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.3 jsr X.Unpak.GetBitInC
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bcs .4 ->TOP16
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* TOP8
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ldx #3
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jsr X.Unpak.GetXBitInA
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bra .51
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*--------------------------------------
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.4 jsr X.Unpak.GetBitInC
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bcs .5 ->TOP32
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* TOP16
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ldx #3
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jsr X.Unpak.GetXBitInA
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ora #%1000
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bra .51
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*--------------------------------------
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.5 jsr X.Unpak.GetBitInC
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bcs .6 ->BACKLINK
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* TOP32
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ldx #4
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jsr X.Unpak.GetXBitInA
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ora #%10000
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.51 tay
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lda (ZPPtr1),y
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.52 jsr X.Unpak.PutByte
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bne .80
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.99 sec
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rts
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*--------------------------------------
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* BACKLINK : 1111 OfsLBits OfsHBits LenBits
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.6 ldx ZPBLOfsLBits
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jsr X.Unpak.GetXBitInA
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eor #$ff
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sec
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adc ZPOutBufPtr
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sta ZPPtr2
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lda ZPBLOfsHBits
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beq .61
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php
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tax
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jsr X.Unpak.GetXBitInA
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plp
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.61 eor #$ff
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adc ZPOutBufPtr+1
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sta ZPPtr2+1
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ldx ZPBLLenBits
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jsr X.Unpak.GetXBitInA
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inc +1
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inc +1
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inc +1
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tax
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ldy #0
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.62 lda (ZPPtr2),y
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jsr X.Unpak.PutByte
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bne .63
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dex
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bne .99
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clc
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rts
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.63 iny
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dex
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bne .62
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.80 lda ZPnCnt
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and ZPnCnt+1
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inc
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bne .2
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clc
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rts
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*--------------------------------------
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X.Unpak.GetULEN jsr X.Unpak.GetByte ULEN LO
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eor #$ff
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sta ZPnCnt
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jsr X.Unpak.GetByte ULEN HI
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eor #$ff
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sta ZPnCnt+1
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rts
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*--------------------------------------
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X.Unpak.GetXBitInA
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lda #0
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.1 pha
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jsr X.Unpak.GetBitInC
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pla
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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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clc
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lda (ZPInBufPtr)
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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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bcc .8
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ror ZPInMask
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jsr X.Unpak.NextByte
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.8 plp
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rts
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*--------------------------------------
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X.Unpak.GetByte lda (ZPInBufPtr)
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X.Unpak.NextByte
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inc ZPInBufPtr
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bne .8
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inc ZPInBufPtr+1
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.8 rts
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*--------------------------------------
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X.Unpak.PutByte inc ZPnCnt
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bne .1
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inc ZPnCnt+1
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beq .8
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.1 sta (ZPOutBufPtr)
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inc ZPOutBufPtr
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bne .8
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inc ZPOutBufPtr+1
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.8 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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