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https://github.com/A2osX/A2osX.git
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72 lines
1.5 KiB
Plaintext
72 lines
1.5 KiB
Plaintext
NEW
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PREFIX /A2OSX.BUILD
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AUTO 4,1
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.LIST OFF
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*--------------------------------------
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Pak.In.Init >LDYA Pak.SrcPtr
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>STYA ZPSrcPtr
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lda Pak.Hdr+S.PAKHDR.LEN
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eor #$ff
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sta Pak.SrcCnt
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lda Pak.Hdr+S.PAKHDR.LEN+1
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eor #$ff
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sta Pak.SrcCnt+1
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rts
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*--------------------------------------
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Pak.In.GetRH lda #$ff
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cmp Pak.SrcCnt+1 return 255 if not $ffxx
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bne .1
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lda Pak.SrcCnt
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eor #$ff return !xx if $ffxx
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.1 rts
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*--------------------------------------
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Pak.In.MoveFWA clc
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adc ZPSrcPtr
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sta ZPSrcPtr
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bcc .8
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inc ZPSrcPtr+1
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.8 rts
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*--------------------------------------
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Pak.In.Get8Bits ldy #8
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.HS 2C bit abs
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Pak.In.Get4Bits ldy #4
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lda #0 make sure to reset A before reading less than 8 bits only
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.1 jsr Pak.In.GetBit and to exit with CC if even if 8 bits read
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rol
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dey
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bne .1
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rts always CC
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*--------------------------------------
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Pak.In.GetBit ldx Pak.In.Mask
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bne .1
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jsr Pak.In.NxtByte
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ldx #8
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.1 dex
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stx Pak.In.GetBit+1
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pha Don't trash A
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lda (UnZPSrcPtr)
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and Pak.In.BitMask,x
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cmp #1 if 0:CC, i>0 CS
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pla
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rts Bit is in C
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*--------------------------------------
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Pak.In.GetByte lda (UnZPSrcPtr)
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Pak.In.NxtByte inc UnZPSrcPtr
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bne .8
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inc UnZPSrcPtr+1
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.8 rts
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*--------------------------------------
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MAN
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SAVE /A2OSX.SRC/LIB/LIBPAK.S.IN
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ASM
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