Commit | Line | Data |
---|---|---|
4c2e3554 | 1 | /* |
2 | * PicoDrive | |
3 | * (C) notaz, 2006-2010,2013 | |
4 | * | |
5 | * This work is licensed under the terms of MAME license. | |
6 | * See COPYING file in the top-level directory. | |
7 | */ | |
8 | ||
9 | #include <string.h> | |
10 | #include "pico_int.h" | |
11 | #include "cd/cue.h" | |
12 | ||
13 | unsigned char media_id_header[0x100]; | |
14 | ||
15 | static void strlwr_(char *string) | |
16 | { | |
3e9da86e | 17 | char *p; |
18 | for (p = string; *p; p++) | |
19 | if ('A' <= *p && *p <= 'Z') | |
20 | *p += 'a' - 'A'; | |
4c2e3554 | 21 | } |
22 | ||
23 | static void get_ext(const char *file, char *ext) | |
24 | { | |
3e9da86e | 25 | const char *p; |
4c2e3554 | 26 | |
3e9da86e | 27 | p = file + strlen(file) - 4; |
28 | if (p < file) p = file; | |
29 | strncpy(ext, p, 4); | |
30 | ext[4] = 0; | |
31 | strlwr_(ext); | |
4c2e3554 | 32 | } |
33 | ||
34 | static int detect_media(const char *fname) | |
35 | { | |
3e9da86e | 36 | static const short sms_offsets[] = { 0x7ff0, 0x3ff0, 0x1ff0 }; |
37 | static const char *sms_exts[] = { "sms", "gg", "sg" }; | |
38 | static const char *md_exts[] = { "gen", "bin", "smd" }; | |
39 | char buff0[32], buff[32]; | |
40 | unsigned short *d16; | |
41 | pm_file *pmf; | |
42 | char ext[5]; | |
43 | int i; | |
44 | ||
45 | get_ext(fname, ext); | |
46 | ||
47 | // detect wrong extensions | |
48 | if (!strcmp(ext, ".srm") || !strcmp(ext, "s.gz") || !strcmp(ext, ".mds")) // s.gz ~ .mds.gz | |
49 | return PM_BAD_DETECT; | |
50 | ||
51 | /* don't believe in extensions, except .cue */ | |
52 | if (strcasecmp(ext, ".cue") == 0) | |
53 | return PM_CD; | |
54 | ||
55 | pmf = pm_open(fname); | |
56 | if (pmf == NULL) | |
57 | return PM_BAD_DETECT; | |
58 | ||
59 | if (pm_read(buff0, 32, pmf) != 32) { | |
60 | pm_close(pmf); | |
61 | return PM_BAD_DETECT; | |
62 | } | |
63 | ||
64 | if (strncasecmp("SEGADISCSYSTEM", buff0 + 0x00, 14) == 0 || | |
65 | strncasecmp("SEGADISCSYSTEM", buff0 + 0x10, 14) == 0) { | |
66 | pm_close(pmf); | |
67 | return PM_CD; | |
68 | } | |
69 | ||
70 | /* check for SMD evil */ | |
71 | if (pmf->size >= 0x4200 && (pmf->size & 0x3fff) == 0x200) { | |
72 | if (pm_seek(pmf, sms_offsets[0] + 0x200, SEEK_SET) == sms_offsets[0] + 0x200 && | |
73 | pm_read(buff, 16, pmf) == 16 && | |
74 | strncmp("TMR SEGA", buff, 8) == 0) | |
75 | goto looks_like_sms; | |
76 | ||
77 | /* could parse further but don't bother */ | |
78 | goto extension_check; | |
79 | } | |
80 | ||
81 | /* MD header? Act as TMSS BIOS here */ | |
82 | if (pm_seek(pmf, 0x100, SEEK_SET) == 0x100 && pm_read(buff, 16, pmf) == 16) { | |
83 | if (strncmp(buff, "SEGA", 4) == 0 || strncmp(buff, " SEG", 4) == 0) | |
84 | goto looks_like_md; | |
85 | } | |
86 | ||
87 | for (i = 0; i < ARRAY_SIZE(sms_offsets); i++) { | |
88 | if (pm_seek(pmf, sms_offsets[i], SEEK_SET) != sms_offsets[i]) | |
89 | continue; | |
90 | ||
91 | if (pm_read(buff, 16, pmf) != 16) | |
92 | continue; | |
93 | ||
94 | if (strncmp("TMR SEGA", buff, 8) == 0) | |
95 | goto looks_like_sms; | |
96 | } | |
4c2e3554 | 97 | |
98 | extension_check: | |
3e9da86e | 99 | /* probably some headerless thing. Maybe check the extension after all. */ |
100 | for (i = 0; i < ARRAY_SIZE(md_exts); i++) | |
101 | if (strcasecmp(pmf->ext, md_exts[i]) == 0) | |
102 | goto looks_like_md; | |
103 | ||
104 | for (i = 0; i < ARRAY_SIZE(sms_exts); i++) | |
105 | if (strcasecmp(pmf->ext, sms_exts[i]) == 0) | |
106 | goto looks_like_sms; | |
107 | ||
108 | /* If everything else fails, make a guess on the reset vector */ | |
109 | d16 = (unsigned short *)(buff0 + 4); | |
110 | if ((((d16[0] << 16) | d16[1]) & 0xffffff) >= pmf->size) { | |
111 | lprintf("bad MD reset vector, assuming SMS\n"); | |
112 | goto looks_like_sms; | |
113 | } | |
4c2e3554 | 114 | |
115 | looks_like_md: | |
3e9da86e | 116 | pm_close(pmf); |
117 | return PM_MD_CART; | |
4c2e3554 | 118 | |
119 | looks_like_sms: | |
3e9da86e | 120 | pm_close(pmf); |
121 | return PM_MARK3; | |
4c2e3554 | 122 | } |
123 | ||
124 | /* checks if fname points to valid MegaCD image */ | |
125 | int PicoCdCheck(const char *fname_in, int *pregion) | |
126 | { | |
3e9da86e | 127 | const char *fname = fname_in; |
128 | unsigned char buf[32]; | |
129 | pm_file *cd_f; | |
130 | int region = 4; // 1: Japan, 4: US, 8: Europe | |
131 | char ext[5]; | |
132 | cue_track_type type = CT_UNKNOWN; | |
133 | cue_data_t *cue_data = NULL; | |
134 | ||
e71fae1f | 135 | // opens a cue, or searches for one |
136 | cue_data = cue_parse(fname_in); | |
137 | if (cue_data != NULL) { | |
138 | fname = cue_data->tracks[1].fname; | |
139 | type = cue_data->tracks[1].type; | |
140 | } | |
141 | else { | |
142 | get_ext(fname_in, ext); | |
143 | if (strcasecmp(ext, ".cue") == 0) | |
3e9da86e | 144 | return -1; |
145 | } | |
146 | ||
147 | cd_f = pm_open(fname); | |
148 | if (cue_data != NULL) | |
149 | cue_destroy(cue_data); | |
150 | ||
151 | if (cd_f == NULL) return 0; // let the upper level handle this | |
152 | ||
153 | if (pm_read(buf, 32, cd_f) != 32) { | |
154 | pm_close(cd_f); | |
155 | return -1; | |
156 | } | |
157 | ||
158 | if (!strncasecmp("SEGADISCSYSTEM", (char *)buf+0x00, 14)) { | |
159 | if (type && type != CT_ISO) | |
160 | elprintf(EL_STATUS, ".cue has wrong type: %i", type); | |
161 | type = CT_ISO; // Sega CD (ISO) | |
162 | } | |
163 | if (!strncasecmp("SEGADISCSYSTEM", (char *)buf+0x10, 14)) { | |
164 | if (type && type != CT_BIN) | |
165 | elprintf(EL_STATUS, ".cue has wrong type: %i", type); | |
166 | type = CT_BIN; // Sega CD (BIN) | |
167 | } | |
168 | ||
169 | if (type == CT_UNKNOWN) { | |
170 | pm_close(cd_f); | |
171 | return 0; | |
172 | } | |
173 | ||
174 | pm_seek(cd_f, (type == CT_ISO) ? 0x100 : 0x110, SEEK_SET); | |
175 | pm_read(media_id_header, sizeof(media_id_header), cd_f); | |
176 | ||
177 | /* it seems we have a CD image here. Try to detect region now.. */ | |
178 | pm_seek(cd_f, (type == CT_ISO) ? 0x100+0x10B : 0x110+0x10B, SEEK_SET); | |
179 | pm_read(buf, 1, cd_f); | |
180 | pm_close(cd_f); | |
181 | ||
182 | if (buf[0] == 0x64) region = 8; // EU | |
183 | if (buf[0] == 0xa1) region = 1; // JAP | |
184 | ||
185 | lprintf("detected %s Sega/Mega CD image with %s region\n", | |
186 | type == CT_BIN ? "BIN" : "ISO", region != 4 ? (region == 8 ? "EU" : "JAP") : "USA"); | |
187 | ||
188 | if (pregion != NULL) | |
4c2e3554 | 189 | *pregion = region; |
190 | ||
3e9da86e | 191 | return type; |
4c2e3554 | 192 | } |
193 | ||
194 | enum media_type_e PicoLoadMedia(const char *filename, | |
195 | const char *carthw_cfg_fname, | |
196 | const char *(*get_bios_filename)(int *region, const char *cd_fname), | |
197 | void (*do_region_override)(const char *media_filename)) | |
198 | { | |
199 | const char *rom_fname = filename; | |
200 | enum media_type_e media_type; | |
274fcc35 | 201 | enum cd_img_type cd_img_type = CIT_NOT_CD; |
3e9da86e | 202 | unsigned char *rom_data = NULL; |
203 | unsigned int rom_size = 0; | |
204 | pm_file *rom = NULL; | |
4c2e3554 | 205 | int cd_region = 0; |
206 | int ret; | |
207 | ||
3e9da86e | 208 | media_type = detect_media(filename); |
209 | if (media_type == PM_BAD_DETECT) | |
210 | goto out; | |
211 | ||
212 | if ((PicoAHW & PAHW_MCD) && Pico_mcd != NULL) | |
274fcc35 | 213 | cdd_unload(); |
3e9da86e | 214 | PicoCartUnload(); |
215 | PicoAHW = 0; | |
a76fad41 | 216 | PicoQuirks = 0; |
3e9da86e | 217 | |
218 | if (media_type == PM_CD) | |
219 | { | |
220 | // check for MegaCD image | |
221 | cd_img_type = PicoCdCheck(filename, &cd_region); | |
da77daa9 | 222 | if ((int)cd_img_type >= 0 && cd_img_type != CIT_NOT_CD) |
3e9da86e | 223 | { |
224 | // valid CD image, ask frontend for BIOS.. | |
4c2e3554 | 225 | rom_fname = NULL; |
226 | if (get_bios_filename != NULL) | |
227 | rom_fname = get_bios_filename(&cd_region, filename); | |
228 | if (rom_fname == NULL) { | |
229 | media_type = PM_BAD_CD_NO_BIOS; | |
230 | goto out; | |
231 | } | |
232 | ||
3e9da86e | 233 | PicoAHW |= PAHW_MCD; |
234 | } | |
235 | else { | |
4c2e3554 | 236 | media_type = PM_BAD_CD; |
237 | goto out; | |
3e9da86e | 238 | } |
239 | } | |
240 | else if (media_type == PM_MARK3) { | |
241 | lprintf("detected SMS ROM\n"); | |
242 | PicoAHW = PAHW_SMS; | |
243 | } | |
244 | ||
245 | rom = pm_open(rom_fname); | |
246 | if (rom == NULL) { | |
bd7b09f4 | 247 | lprintf("Failed to open ROM\n"); |
4c2e3554 | 248 | media_type = PM_ERROR; |
3e9da86e | 249 | goto out; |
250 | } | |
251 | ||
252 | ret = PicoCartLoad(rom, &rom_data, &rom_size, (PicoAHW & PAHW_SMS) ? 1 : 0); | |
253 | pm_close(rom); | |
254 | if (ret != 0) { | |
bd7b09f4 D |
255 | if (ret == 2) lprintf("Out of memory\n"); |
256 | else if (ret == 3) lprintf("Read failed\n"); | |
257 | else lprintf("PicoCartLoad() failed.\n"); | |
4c2e3554 | 258 | media_type = PM_ERROR; |
3e9da86e | 259 | goto out; |
260 | } | |
4c2e3554 | 261 | |
3e9da86e | 262 | // detect wrong files |
263 | if (strncmp((char *)rom_data, "Pico", 4) == 0) { | |
4c2e3554 | 264 | lprintf("savestate selected?\n"); |
265 | media_type = PM_BAD_DETECT; | |
3e9da86e | 266 | goto out; |
4c2e3554 | 267 | } |
268 | ||
3e9da86e | 269 | if (!(PicoAHW & PAHW_SMS)) { |
270 | unsigned short *d = (unsigned short *)(rom_data + 4); | |
271 | if ((((d[0] << 16) | d[1]) & 0xffffff) >= (int)rom_size) { | |
272 | lprintf("bad reset vector\n"); | |
4c2e3554 | 273 | media_type = PM_BAD_DETECT; |
274 | goto out; | |
3e9da86e | 275 | } |
276 | } | |
4c2e3554 | 277 | |
3e9da86e | 278 | // load config for this ROM (do this before insert to get correct region) |
279 | if (!(PicoAHW & PAHW_MCD)) { | |
280 | memcpy(media_id_header, rom_data + 0x100, sizeof(media_id_header)); | |
4c2e3554 | 281 | if (do_region_override != NULL) |
282 | do_region_override(filename); | |
283 | } | |
284 | ||
3e9da86e | 285 | if (PicoCartInsert(rom_data, rom_size, carthw_cfg_fname)) { |
4c2e3554 | 286 | media_type = PM_ERROR; |
3e9da86e | 287 | goto out; |
288 | } | |
4c2e3554 | 289 | rom_data = NULL; // now belongs to PicoCart |
fa8fb754 | 290 | Pico.m.ncart_in = 0; |
4c2e3554 | 291 | |
3e9da86e | 292 | // insert CD if it was detected |
293 | if (cd_img_type != CIT_NOT_CD) { | |
274fcc35 | 294 | ret = cdd_load(filename, cd_img_type); |
3e9da86e | 295 | if (ret != 0) { |
296 | PicoCartUnload(); | |
4c2e3554 | 297 | media_type = PM_BAD_CD; |
3e9da86e | 298 | goto out; |
299 | } | |
fa8fb754 | 300 | Pico.m.ncart_in = 1; |
3e9da86e | 301 | } |
4c2e3554 | 302 | |
a76fad41 | 303 | if (PicoQuirks & PQUIRK_FORCE_6BTN) |
304 | PicoSetInputDevice(0, PICO_INPUT_PAD_6BTN); | |
305 | ||
4c2e3554 | 306 | out: |
3e9da86e | 307 | if (rom_data) |
308 | free(rom_data); | |
4c2e3554 | 309 | return media_type; |
310 | } | |
311 | ||
312 | // vim:shiftwidth=2:ts=2:expandtab |