| ;;
;; Size-optimized LZSA2 decompressor by spke (v.1 02-09/06/2019, 145 bytes) ;; ;; The data must be compressed using the command line compressor by Emmanuel Marty ;; The compression is done as follows: ;; ;; lzsa.exe -f2 -r <sourcefile> <outfile> ;; ;; where option -r asks for the generation of raw (frame-less) data. ;; ;; The decompression is done in the standard way ;; ;; ld hl,CompressedData ;; ld de,WhereToDecompress ;; call DecompressLZSA2 ;; ;; Of course, LZSA2 compression algorithm is (c) 2019 Emmanuel Marty, ;; see https //github.com/emmanuel-marty/lzsa for more information ;; ;; Drop me an email if you have any comments/ideas/suggestions zxintrospec@gmail.com ;; ORG &A000 nolist WRITE "LZSA2" xor a : ld b,a : ex af,af' : jr ReadToken CASE0xx ld d,#FF : cp %01000000 : jr c,CASE00x CASE01x cp %01100000 : rl d OffsetReadE ld e,(hl) : inc hl SaveOffset ld iyl,e : ld iyh,d MatchLen and %00000111 : add 2 : cp 9 : call z,ExtendedCode CopyMatch ld c,a ex (sp),hl : push hl ; BC = len, DE = offset, HL = dest, SP ->[dest,src] add hl,de : pop de ; BC = len, DE = dest, HL = dest-offset, SP->[src] ldir : pop hl ReadToken ld a,(hl) : ld ixl,a : inc hl and %00011000 : jr z,NoLiterals rrca : rrca : rrca call pe,ExtendedCode ld c,a ldir NoLiterals push de : ld a,ixl or a : jp p,CASE0xx CASE1xx cp %11000000 : jr nc,CASE11x CASE10x call ReadNibble ld d,a : ld a,c cp %10100000 : rl d dec d : dec d : jr OffsetReadE CASE00x call ReadNibble ld e,a : ld a,c cp %00100000 : rl e : jr SaveOffset CASE11x cp %11100000 : jr c,CASE110 CASE111 ld e,iyl : ld d,iyh : jr MatchLen CASE110 ld d,(hl) : inc hl : jr OffsetReadE ExtendedCode call ReadNibble : inc a : jr z,ExtraByte sub #F0+1 : add c : ret ExtraByte ld a,15 : add c : add (hl) : inc hl : ret nc ld a,(hl) : inc hl ld b,(hl) : inc hl : ret nz pop de : pop de : ret ReadNibble ld c,a : xor a : ex af,af' : ret m UpdateNibble ld a,(hl) : or #F0 : ex af,af' ld a,(hl) : inc hl : or #0F rrca : rrca : rrca : rrca : ret |