summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/machine/jalcrpt.cpp
blob: e8e35f33c200b4c144b30c362cd3b6f419378d79 (plain) (blame)
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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
// license:BSD-3-Clause
// copyright-holders:Luca Elia, David Haywood
#include "emu.h"
#include "machine/jalcrpt.h"


void phantasm_rom_decode(running_machine &machine, const char *region)
{
	UINT16  *RAM    =   (UINT16 *) machine.root_device().memregion(region)->base();
	int i,      size    =   machine.root_device().memregion(region)->bytes();
	if (size > 0x40000) size = 0x40000;

	for (i = 0 ; i < size/2 ; i++)
	{
		UINT16 x,y;

		x = RAM[i];

// [0] def0 189a bc56 7234
// [1] fdb9 7531 eca8 6420
// [2] 0123 4567 ba98 fedc
#define BITSWAP_0   BITSWAP16(x,0xd,0xe,0xf,0x0,0x1,0x8,0x9,0xa,0xb,0xc,0x5,0x6,0x7,0x2,0x3,0x4)
#define BITSWAP_1   BITSWAP16(x,0xf,0xd,0xb,0x9,0x7,0x5,0x3,0x1,0xe,0xc,0xa,0x8,0x6,0x4,0x2,0x0)
#define BITSWAP_2   BITSWAP16(x,0x0,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0xb,0xa,0x9,0x8,0xf,0xe,0xd,0xc)

		if      (i < 0x08000/2) { if ( (i | (0x248/2)) != i ) {y = BITSWAP_0;} else {y = BITSWAP_1;} }
		else if (i < 0x10000/2) { y = BITSWAP_2; }
		else if (i < 0x18000/2) { if ( (i | (0x248/2)) != i ) {y = BITSWAP_0;} else {y = BITSWAP_1;} }
		else if (i < 0x20000/2) { y = BITSWAP_1; }
		else                    { y = BITSWAP_2; }

#undef  BITSWAP_0
#undef  BITSWAP_1
#undef  BITSWAP_2

		RAM[i] = y;
	}

}

void astyanax_rom_decode(running_machine &machine, const char *region)
{
	UINT16  *RAM    =   (UINT16 *) machine.root_device().memregion(region)->base();
	int i,      size    =   machine.root_device().memregion(region)->bytes();
	if (size > 0x40000) size = 0x40000;

	for (i = 0 ; i < size/2 ; i++)
	{
		UINT16 x,y;

		x = RAM[i];

// [0] def0 a981 65cb 7234
// [1] fdb9 7531 8ace 0246
// [2] 4567 0123 ba98 fedc

#define BITSWAP_0   BITSWAP16(x,0xd,0xe,0xf,0x0,0xa,0x9,0x8,0x1,0x6,0x5,0xc,0xb,0x7,0x2,0x3,0x4)
#define BITSWAP_1   BITSWAP16(x,0xf,0xd,0xb,0x9,0x7,0x5,0x3,0x1,0x8,0xa,0xc,0xe,0x0,0x2,0x4,0x6)
#define BITSWAP_2   BITSWAP16(x,0x4,0x5,0x6,0x7,0x0,0x1,0x2,0x3,0xb,0xa,0x9,0x8,0xf,0xe,0xd,0xc)

		if      (i < 0x08000/2) { if ( (i | (0x248/2)) != i ) {y = BITSWAP_0;} else {y = BITSWAP_1;} }
		else if (i < 0x10000/2) { y = BITSWAP_2; }
		else if (i < 0x18000/2) { if ( (i | (0x248/2)) != i ) {y = BITSWAP_0;} else {y = BITSWAP_1;} }
		else if (i < 0x20000/2) { y = BITSWAP_1; }
		else                    { y = BITSWAP_2; }

#undef  BITSWAP_0
#undef  BITSWAP_1
#undef  BITSWAP_2

		RAM[i] = y;
	}
}

void rodland_rom_decode(running_machine &machine, const char *region)
{
	UINT16  *RAM    =   (UINT16 *) machine.root_device().memregion(region)->base();
	int i,      size    =   machine.root_device().memregion(region)->bytes();
	if (size > 0x40000) size = 0x40000;

	for (i = 0 ; i < size/2 ; i++)
	{
		UINT16 x,y;

		x = RAM[i];

// [0] d0a9 6ebf 5c72 3814  [1] 4567 0123 ba98 fedc
// [2] fdb9 ce07 5318 a246  [3] 4512 ed3b a967 08fc
#define BITSWAP_0   BITSWAP16(x,0xd,0x0,0xa,0x9,0x6,0xe,0xb,0xf,0x5,0xc,0x7,0x2,0x3,0x8,0x1,0x4);
#define BITSWAP_1   BITSWAP16(x,0x4,0x5,0x6,0x7,0x0,0x1,0x2,0x3,0xb,0xa,0x9,0x8,0xf,0xe,0xd,0xc);
#define BITSWAP_2   BITSWAP16(x,0xf,0xd,0xb,0x9,0xc,0xe,0x0,0x7,0x5,0x3,0x1,0x8,0xa,0x2,0x4,0x6);
#define BITSWAP_3   BITSWAP16(x,0x4,0x5,0x1,0x2,0xe,0xd,0x3,0xb,0xa,0x9,0x6,0x7,0x0,0x8,0xf,0xc);

		if      (i < 0x08000/2) {   if ( (i | (0x248/2)) != i ) {y = BITSWAP_0;} else {y = BITSWAP_1;} }
		else if (i < 0x10000/2) {   if ( (i | (0x248/2)) != i ) {y = BITSWAP_2;} else {y = BITSWAP_3;} }
		else if (i < 0x18000/2) {   if ( (i | (0x248/2)) != i ) {y = BITSWAP_0;} else {y = BITSWAP_1;} }
		else if (i < 0x20000/2) { y = BITSWAP_1; }
		else                    { y = BITSWAP_3; }

#undef  BITSWAP_0
#undef  BITSWAP_1
#undef  BITSWAP_2
#undef  BITSWAP_3

		RAM[i] = y;
	}
}

/********** DECRYPT **********/

/* 4 known types */

/* SS91022-10: desertwr, gratiaa, tp2m32, gametngk */

/* SS92046_01: bbbxing, f1superb, tetrisp, hayaosi2 */

/* SS92047-01: gratia, kirarast */

/* SS92048-01: p47aces, 47pie2, 47pie2o */

void ms32_rearrange_sprites(running_machine &machine, const char *region)
{
	/* sprites are not encrypted, but we need to move the data around to handle them as 256x256 tiles */
	int i;
	UINT8 *source_data;
	int source_size;

	source_data = machine.root_device().memregion       ( region )->base();
	source_size = machine.root_device().memregion( region )->bytes();

	dynamic_buffer result_data(source_size);

	for(i=0; i<source_size; i++)
	{
		int j = (i & ~0x07f8) | ((i & 0x00f8) << 3) | ((i & 0x0700) >> 5);

		result_data[i] = source_data[j];
	}

	memcpy (source_data, &result_data[0], source_size);
}


void decrypt_ms32_tx(running_machine &machine, int addr_xor,int data_xor, const char *region)
{
	int i;
	UINT8 *source_data;
	int source_size;

	source_data = machine.root_device().memregion       ( region )->base();
	source_size = machine.root_device().memregion( region )->bytes();

	dynamic_buffer result_data(source_size);

	addr_xor ^= 0x1005d;

	for(i=0; i<source_size; i++)
	{
		int j;

		/* two groups of cascading XORs for the address */
		j = 0;
		i ^= addr_xor;

		if (BIT(i,18)) j ^= 0x40000;    // 18
		if (BIT(i,17)) j ^= 0x60000;    // 17
		if (BIT(i, 7)) j ^= 0x70000;    // 16
		if (BIT(i, 3)) j ^= 0x78000;    // 15
		if (BIT(i,14)) j ^= 0x7c000;    // 14
		if (BIT(i,13)) j ^= 0x7e000;    // 13
		if (BIT(i, 0)) j ^= 0x7f000;    // 12
		if (BIT(i,11)) j ^= 0x7f800;    // 11
		if (BIT(i,10)) j ^= 0x7fc00;    // 10

		if (BIT(i, 9)) j ^= 0x00200;    //  9
		if (BIT(i, 8)) j ^= 0x00300;    //  8
		if (BIT(i,16)) j ^= 0x00380;    //  7
		if (BIT(i, 6)) j ^= 0x003c0;    //  6
		if (BIT(i,12)) j ^= 0x003e0;    //  5
		if (BIT(i, 4)) j ^= 0x003f0;    //  4
		if (BIT(i,15)) j ^= 0x003f8;    //  3
		if (BIT(i, 2)) j ^= 0x003fc;    //  2
		if (BIT(i, 1)) j ^= 0x003fe;    //  1
		if (BIT(i, 5)) j ^= 0x003ff;    //  0

		i ^= addr_xor;

		/* simple XOR for the data */
		result_data[i] = source_data[j] ^ (i & 0xff) ^ data_xor;
	}

	memcpy (source_data, &result_data[0], source_size);
}

void decrypt_ms32_bg(running_machine &machine, int addr_xor,int data_xor, const char *region)
{
	int i;
	UINT8 *source_data;
	int source_size;

	source_data = machine.root_device().memregion       ( region )->base();
	source_size = machine.root_device().memregion( region )->bytes();

	dynamic_buffer result_data(source_size);

	addr_xor ^= 0xc1c5b;

	for(i=0; i<source_size; i++)
	{
		int j;

		/* two groups of cascading XORs for the address */
		j = (i & ~0xfffff); /* top bits are not affected */
		i ^= addr_xor;

		if (BIT(i,19)) j ^= 0x80000;    // 19
		if (BIT(i, 8)) j ^= 0xc0000;    // 18
		if (BIT(i,17)) j ^= 0xe0000;    // 17
		if (BIT(i, 2)) j ^= 0xf0000;    // 16
		if (BIT(i,15)) j ^= 0xf8000;    // 15
		if (BIT(i,14)) j ^= 0xfc000;    // 14
		if (BIT(i,13)) j ^= 0xfe000;    // 13
		if (BIT(i,12)) j ^= 0xff000;    // 12
		if (BIT(i, 1)) j ^= 0xff800;    // 11
		if (BIT(i,10)) j ^= 0xffc00;    // 10

		if (BIT(i, 9)) j ^= 0x00200;    //  9
		if (BIT(i, 3)) j ^= 0x00300;    //  8
		if (BIT(i, 7)) j ^= 0x00380;    //  7
		if (BIT(i, 6)) j ^= 0x003c0;    //  6
		if (BIT(i, 5)) j ^= 0x003e0;    //  5
		if (BIT(i, 4)) j ^= 0x003f0;    //  4
		if (BIT(i,18)) j ^= 0x003f8;    //  3
		if (BIT(i,16)) j ^= 0x003fc;    //  2
		if (BIT(i,11)) j ^= 0x003fe;    //  1
		if (BIT(i, 0)) j ^= 0x003ff;    //  0

		i ^= addr_xor;

		/* simple XOR for the data */
		result_data[i] = source_data[j] ^ (i & 0xff) ^ data_xor;
	}

	memcpy (source_data, &result_data[0], source_size);
}