mirror of
https://github.com/option8/SG32.git
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160 lines
6.6 KiB
Plaintext
160 lines
6.6 KiB
Plaintext
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DSK SG32
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**************************************************
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* Version 1.0 - 32-byte output
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* By Charles Mangin
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* License: CC0 1.0 Universal
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* https://creativecommons.org/publicdomain/zero/1.0/
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**************************************************
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* "To make a Cold Hash, or Salad-Magundy. TAKE a cold Turkey, two cold Chickens,
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* or if you have neither, a piece of fine white Veal will do; cut the Breasts of
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* these Fowls into fair dices, and Mince all the rest; to the Quantity of two
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* Chickens you mull take eight or ten large Anchovies, wash and bone them, eight
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* large Pickl’d Oysters, ten or twelve fine green Pickl’d Cucumbers, shred the
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* Oysters, the Anchovies, the Cucumbers, and one whole Lemon small, mix them with
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* the shred Meat, lay it in the middle of the Dish, lay the Dices of the white part
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* round the Dish, with halv’d Anchovies, whole Pickl’d Oysters, quarter’d Cucumbers,
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* sliced Lemon, whole Pickl’d Mushrooms, Capers or any Pickle you like; cut also
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* some fine Lettice, and lay round among the Garnish, but put not Oil and Vinegar
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* to the Minced Meat, ’till it comes to Table."
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*
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* -- https://en.wikipedia.org/wiki/Salmagundi
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**************************************************
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* Variables
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**************************************************
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HASH EQU $800
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SCRATCH EQU $900
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SEED EQU $B00
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MESSAGE EQU $C00
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**************************************************
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* Apple Standard Memory Locations
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**************************************************
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COUT EQU $FDED ; CALLS THE OUTPUT ROUTINE
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NEWLINE EQU $FD8E ; OUTPUTS NEW LINE/ CARRIAGE RETURN
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PRHEX EQU $FDDA ; PRINTS BYTE IN ACCUMULATOR AS HEX
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**************************************************
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* Let's get this party started
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**************************************************
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ORG $0300 ; PROGRAM DATA STARTS AT $800
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* EC-ED - ITERATIONS
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* MESSAGE ORIGIN IN FC,FD
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* MESSAGE DESTINATION IN EE,EF
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* BLOAD FILE LENGTH AT $AA60 -> FA,FB
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CLEARMEM
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LDA #$00
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TAY
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ZERO DEY
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STA HASH, Y
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BNE ZERO
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* EORs MESSAGE TO SCRATCH WITH RUNNING CHECKSUM, PADS WITH BYTES FROM SEED IF NEEDED
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LDA #$00 ; ZERO ITERATION COUNT
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STA $EC ;
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STA $ED ;
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STA $FE ; CLEAR CHECKSUM
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STA $FC
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TAX ;
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TAY ;
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LDA #$0C
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STA $FD
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ITERATE INC $ED ; INCREMENT ITERATION COUNT LO <--INCED
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BNE ROLLOVER ; ROLLED OVER TO 0?
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INC $EC ; IF SO, INCREMENT HI BYTE
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ROLLOVER LDA $ED ; ITERATION == MESSAGE LENGTH?
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CMP $FA ; BLOAD FILE LENGTH AT $AA60
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BNE FULLLENGTH ; NOT YET
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LDA $EC ; YES? HOW ABOUT HI BYTE?
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CMP $FB ; BLOAD FILE LENGTH AT $AA60
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BNE FULLLENGTH ; NOT YET. CONTINUE.
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LDA #$0B ; MESSAGE LENGTH COMPLETE
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STA $FD ; POINT MESSAGE SOURCE TO SEED PAGE 0B00
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LDY #$00 ; ZERO Y OFFSET
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STY $FA ; ZERO MESSAGE LENGTH
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STY $FB ; ZERO MESSAGE LENGTH
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FULLLENGTH LDA ($FC),Y ; LOAD ORIGIN + Y OFFSET
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EOR SCRATCH,X ; COMBINE WITH SEED/SCRATCH
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STA SCRATCH,X ; STORE DESTINATION + X OFFSET
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EOR $FE ; XOR WITH RUNNING CHECKSUM
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STA $FE ; STORE CHECKSUM
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INY ; NEXT Y OFFSET
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BNE NEXTOFFSET ; IF Y=ZERO, NEXT SOURCE PAGE
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INC $FD ; IF Y=ZERO, NEXT SOURCE PAGE
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NEXTOFFSET INX ; NEXT X OFFSET
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CPX #$FF ; IS X=FF
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BNE ITERATE ; OTHERWISE LOOP -> INCED
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STA SCRATCH,X ; STORE CHECKSUM AT SCRATCH+FF
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INX ; ZERO X OFFSET
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LDA $FB ; X=0. DOING SEED PADDING?
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ORA $FA ; IF SO, FA, FB WILL BE ZERO
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BNE ITERATE ; IF FA/FB=ZERO THEN FINISH
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* load 4 bytes into FPAcc. Multiply by GRatio. EOR result bytes into hash.
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* repeats until all 256 bytes of scratch processed.
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LDA GOLDENLO ; GOLDEN RATIO IN FP FORMAT
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LDY GOLDENHI
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JSR $E9E3 ; PUTS GR INTO ARG (A5-A9)
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LDA #$09 ; SCRATCH PAGE SOURCE into FC/FB
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STA $FC
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LDA #$FC ; last 4 bytes of scratch
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STA $FB
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HASHLO LDA #$1F ; HASH DESTINATION FE/FD
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STA $FD
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LDY #$03 ; 4 BYTES AT A GO - FROM RIGHT TO LEFT
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HASHHI LDA #$08 ; HASH DESTINATION HI BYTE
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STA $FE
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LDA #$81
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STA $9D ; reset FPA high byte for Multiply
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LOADSCRATCH LDA ($FB),Y ; LOAD SCRATCH BYTES INTO FAC
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STA $009E,Y ; FAC=9d-a1
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DEY
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BPL LOADSCRATCH
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JSR $E982 ; Multiply FAC and ARG.
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LDY #$00
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LDA $A1
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EOR $A0
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EOR $9F
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EOR $9E
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EOR ($FD),Y ; EOR RESULT BYTES WITH BYTE IN HASH,
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STA ($FD),Y ; STORE IN HASH
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DEC $FB ; SLIDE UP ONE BYTE AND REPEAT
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BEQ PRHASH
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DEC $FD ; NEXT BYTE OF HASH
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BPL HASHHI
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BMI HASHLO
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PRHASH LDY #$00 ; print hash as hex
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LDX #$08
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LDHASH LDA HASH,Y
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DOTHETHING JSR PRHEX ; PRINTS HEX CHAR
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LDA #$A0
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JSR COUT ; SPACE AFTER EACH BYTE
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DEX
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BNE NEXTHEX
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JSR NEWLINE ; NEWLINE AFTER 8 BYTES - PRETTIFY FORMATTING
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LDX #$08
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NEXTHEX INY
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CPY #$20
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BNE LDHASH
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RTS
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GOLDEN EQU *
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HEX 81,CF,1B,BC,DD ; golden ratio
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GOLDENLO db <GOLDEN
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GOLDENHI db >GOLDEN
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*** SEED BYTES
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*** B3 83 BD D3 1E F4 A6 F5 83 FC B0 10 0C 1F 67 CA DE 53 CB C1 14 64 70 4C B7 EA 51 7A 63 30 88 7E
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*** 67 07 7B A7 3C E9 4D EB 07 F9 61 20 18 3E CE 95 BD A6 97 83 28 C8 E0 98 6F D5 A2 F4 C6 60 11 FC
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*** CE 0E F6 4F 78 D3 9A D7 0E F3 C2 40 30 7C 9D 2B 7B 4D 2F 07 50 91 C1 31 DE AB 45 E9 8D C0 22 F9
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*** 9D 1C ED 9E F0 A7 35 AF 1C E7 85 80 60 F8 3B 56 F6 9A 5E 0E A0 23 83 62 BD 57 8A D3 1B 81 44 F3
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*** 3B 38 DB 3D E1 4F 6A 5F 38 CF 0B 01 C0 F1 76 AC ED 35 BC 1C 41 46 07 C4 7B AE 15 A7 36 03 88 E7
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*** 76 70 B7 7A C3 9E D4 BE 70 9F 16 02 81 E3 EC 59 DB 6A 79 38 82 8C 0E 89 F6 5D 2A 4F 6C 06 11 CF
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*** EC E0 6F F4 87 3D A9 7D E0 3F 2C 04 03 C7 D9 B2 B7 D4 F2 70 05 19 1C 13 ED BA 54 9E D8 0C 22 9F
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*** D9 C1 DE E9 0F 7A 53 FA C1 7E 58 08 06 8F B3 65 6F A9 E5 E0 0A 32 38 26 DB 75 A8 3D B1 18 44 3F
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