178 lines
4.2 KiB
NASM
178 lines
4.2 KiB
NASM
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;Exomizer 3 Z80 decoder
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;Copyright (C) 2008-2018 by Jaime Tejedor Gomez (Metalbrain)
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;
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;Optimized by Antonio Villena and Urusergi
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;
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;Compression algorithm by Magnus Lind
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; exomizer raw -P15 -T1
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;
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; This depacker is free software; you can redistribute it and/or
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; modify it under the terms of the GNU Lesser General Public
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; License as published by the Free Software Foundation; either
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; version 2.1 of the License, or (at your option) any later version.
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;
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; This library is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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; Lesser General Public License for more details.
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;
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; You should have received a copy of the GNU Lesser General Public
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; License along with this library; if not, write to the Free Software
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; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;
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; mapbase low byte must $00
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xor a
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ld a, 128
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ld iyl, 240
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ld b, 52
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push de
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init ld c, 16
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jr nz, get4
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ld de, 1
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ld ixl, c
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defb 218
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gb4 ld a, (hl)
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dec hl
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get4 adc a, a
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jr z, gb4
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rl c
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jr nc, get4
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ld iyh, mapbase/256
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ex af, af'
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ld a, c
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rrca
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inc a
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ld (iy+0), a
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jr nc, get5
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xor 136
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get5 push hl
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ld hl, 1
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defb 56
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setbit add hl, hl
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dec a
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jr nz, setbit
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ex af, af'
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inc iyh
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ld (iy+0), e
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inc iyh
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ld (iy+0), d
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add hl, de
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ex de, hl
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inc iyl
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pop hl
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dec ixl
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djnz init
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pop de
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litcop ldd
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mloop add a, a
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jr z, gbm
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jr c, litcop
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gbmc ld bc, mapbase+240
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add a, a
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jr z, gbi2
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jr c, gbic
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getind add a, a
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jr z, gbi
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geti2 inc c
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jr nc, getind
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ret z
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gbic and a
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push de
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ex af, af'
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ld a, (bc)
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ld b, a
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ex af, af'
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ld de, 0
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dec b
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call nz, getbits
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ex af, af'
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ld b, (mapbase/256)+1
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ld a, (bc)
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inc b
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add a, e
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ld e, a
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ld a, (bc)
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adc a, d
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ld d, a
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push de
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ld bc, 512+32
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dec e
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jr z, goit
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dec e
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ld bc, 1024+16
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jr z, goit
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ld c, 0
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ld e, c
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goit ld d, e
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ex af, af'
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call lee8
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ex af, af'
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ld a, e
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add a, c
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ld c, a
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ld e, d
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ld b, mapbase/256
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ld a, (bc)
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ld b, a
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ex af, af'
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dec b
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call nz, getbits
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ex af, af'
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ld b, (mapbase/256)+1
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ld a, (bc)
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inc b
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add a, e
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ld e, a
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ld a, (bc)
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adc a, d
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ld d, a
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ex af, af'
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pop bc
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ex (sp), hl
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ex de, hl
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add hl, de
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lddr
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pop hl
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jp mloop
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gbi ld a, (hl)
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dec hl
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adc a, a
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jr nc, geti2
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inc c
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jp nz, gbic
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ret
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gbi2 ld a, (hl)
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dec hl
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adc a, a
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jr nc, getind
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jp gbic
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gbm ld a, (hl)
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dec hl
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adc a, a
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jr nc, gbmc
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jp litcop
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getbits jp p, lee8
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rl b
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jr z, gby
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srl b
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defb $fa
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xopy ld a, (hl)
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dec hl
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lee16 adc a, a
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jr z, xopy
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rl d
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djnz lee16
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gby ld e, (hl)
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dec hl
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ret
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copy ld a, (hl)
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dec hl
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lee8 adc a, a
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jr z, copy
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rl e
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djnz lee8
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ret
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