aboutsummaryrefslogtreecommitdiff
path: root/tools/rasm/decrunch/exomizer3megachur.asm
blob: ea1973eb279b37c0160596a53877540e9089c1a5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
;Exomizer 2 Z80 decoder
;Copyright (C) 2008-2016 by Jaime Tejedor Gomez (Metalbrain)
;
;Optimized by Antonio Villena and Urusergi (169 bytes)
;
;Compression algorithm by Magnus Lind
;
;  This depacker is free software; you can redistribute it and/or
;  modify it under the terms of the GNU Lesser General Public
;  License as published by the Free Software Foundation; either
;  version 2.1 of the License, or (at your option) any later version.
;
;  This library is distributed in the hope that it will be useful,
;  but WITHOUT ANY WARRANTY; without even the implied warranty of
;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;  Lesser General Public License for more details.
;
;  You should have received a copy of the GNU Lesser General Public
;  License along with this library; if not, write to the Free Software
;  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;
;
;input- hl=compressed data start
;  de=uncompressed destination start
;
;  you may change exo_mapbasebits to point to any free buffer
;
;ATTENTION!
;A huge speed boost (around 14%) can be gained at the cost of only 5 bytes.
;If you want this, replace all instances of "call exo_getbit" with "srl a" followed by
;"call z,exo_getbit", and remove the first two instructions in exo_getbit routine.
; ---------------------------
; modified by Megachur in 2018
; ---------------------------
; hl -> compressed data start
; de -> uncompressed destination start
; ---------------------------

;EXO_BACKWARD equ 1
ENABLE_MEXO_GETBIT	equ 1

list:EXOMIZER_ADDRESS:nolist
; ---------------------------
MACRO MEXO_GETBIT
	srl a
	jr nz,@1
	ld a,(hl)
	IFDEF EXO_BACKWARD
	dec hl
	ELSE
	inc hl
	ENDIF
	rra
@1
ENDM

deexo:
	ld iy,exo_mapbasebits+11
	ld a,(hl)

	IFDEF EXO_BACKWARD
	dec hl
	ELSE 
	inc hl
	ENDIF

	ld b,52
	push de
	cp a

exo_initbits:
	ld c,16
	jr nz,exo_get4bits
	ld ixl,c
	ld de,1  ;DE=b2

exo_get4bits:
	IFDEF ENABLE_MEXO_GETBIT
	MEXO_GETBIT
	ELSE
	srl a:call z,exo_getbit	;call exo_getbit ;get one bit
	ENDIF
	rl c
	jr nc,exo_get4bits
	inc c
	push hl
	ld hl,1
	ld (iy+41),c ;bits[i]=b1 (and opcode 41 == add hl,hl)

exo_setbit:
	dec c
	jr nz,exo_setbit-1 ;jump to add hl,hl instruction
	ld (iy-11),e
	ld (iy+93),d ;base[i]=b2
	add hl,de
	ex de,hl
	inc iy
	pop hl
	dec ixl
	djnz exo_initbits
	pop de
	jr exo_mainloop

exo_literalrun:
	ld e,c  ;DE=1

exo_getbits:
	dec b
	ret z

exo_getbits1:
	IFDEF ENABLE_MEXO_GETBIT
	MEXO_GETBIT
	ELSE
	srl a:call z,exo_getbit	;call exo_getbit
	ENDIF
	rl e
	rl d
	jr nc,exo_getbits
	ld b,d
	ld c,e
	pop de

exo_literalcopy:
	IFDEF EXO_BACKWARD
	lddr
	ELSE
	ldir
	ENDIF
exo_mainloop:
	inc c
	IFDEF ENABLE_MEXO_GETBIT
	MEXO_GETBIT
	ELSE
	srl a:call z,exo_getbit	;call exo_getbit ;literal?
	ENDIF
	jr c,exo_literalcopy
	ld c,239
exo_getindex:
	IFDEF ENABLE_MEXO_GETBIT
	MEXO_GETBIT
	ELSE
	srl a:call z,exo_getbit	;call exo_getbit
	ENDIF
	inc c
	jr nc,exo_getindex
	ret z
	push de
	ld d,b
	jp p,exo_literalrun
	ld iy,exo_mapbasebits-229
	call exo_getpair
	push de
	rlc d
	jr nz,exo_dontgo
	dec e
	ld bc,512+32 ;2 bits,48 offset
	jr z,exo_goforit
	dec e ;2?
exo_dontgo:
	ld bc,1024+16 ;4 bits,32 offset
	jr z,exo_goforit
	ld de,0
	ld c,d  ;16 offset
exo_goforit:
	call exo_getbits1
	ld iy,exo_mapbasebits+27
	add iy,de
	call exo_getpair
	pop bc
	ex (sp),hl
	IFDEF EXO_BACKWARD
	ex de,hl
	add hl,de
	lddr
	ELSE
	push hl
	sbc hl,de
	pop de
	ldir
	ENDIF
	pop hl
	jr exo_mainloop ;Next!
exo_getpair:
	add iy,bc
	ld e,d
	ld b,(iy+41)
	call exo_getbits
	ex de,hl
	ld c,(iy-11)
	ld b,(iy+93)
	add hl,bc ;Always clear C flag
	ex de,hl
	ret

	IFDEF ENABLE_MEXO_GETBIT
	ELSE
exo_getbit: 
;	srl a
;	ret nz
	ld a,(hl)
	inc hl
	rra
	ret
	ENDIF

exo_mapbasebits:
	ds 156,#00   ;tables for bits,baseL,baseH
; ---------------------------
list:EXOMIZER_ADDRESS_LENGTH equ $-EXOMIZER_ADDRESS:nolist