-static unsigned char id_header[0x100];\r
-\r
-/* checks if fname points to valid MegaCD image */\r
-static int emu_cd_check(int *pregion, const char *fname_in)\r
-{\r
- const char *fname = fname_in;\r
- unsigned char buf[32];\r
- pm_file *cd_f;\r
- int region = 4; // 1: Japan, 4: US, 8: Europe\r
- char ext[5];\r
- cue_track_type type = CT_UNKNOWN;\r
- cue_data_t *cue_data = NULL;\r
-\r
- get_ext(fname_in, ext);\r
- if (strcasecmp(ext, ".cue") == 0) {\r
- cue_data = cue_parse(fname_in);\r
- if (cue_data != NULL) {\r
- fname = cue_data->tracks[1].fname;\r
- type = cue_data->tracks[1].type;\r
- }\r
- else\r
- return -1;\r
- }\r
-\r
- cd_f = pm_open(fname);\r
- if (cue_data != NULL)\r
- cue_destroy(cue_data);\r
-\r
- if (cd_f == NULL) return 0; // let the upper level handle this\r
-\r
- if (pm_read(buf, 32, cd_f) != 32) {\r
- pm_close(cd_f);\r
- return -1;\r
- }\r
-\r
- if (!strncasecmp("SEGADISCSYSTEM", (char *)buf+0x00, 14)) {\r
- if (type && type != CT_ISO)\r
- elprintf(EL_STATUS, ".cue has wrong type: %i", type);\r
- type = CT_ISO; // Sega CD (ISO)\r
- }\r
- if (!strncasecmp("SEGADISCSYSTEM", (char *)buf+0x10, 14)) {\r
- if (type && type != CT_BIN)\r
- elprintf(EL_STATUS, ".cue has wrong type: %i", type);\r
- type = CT_BIN; // Sega CD (BIN)\r
- }\r
-\r
- if (type == CT_UNKNOWN) {\r
- pm_close(cd_f);\r
- return 0;\r
- }\r
-\r
- pm_seek(cd_f, (type == CT_ISO) ? 0x100 : 0x110, SEEK_SET);\r
- pm_read(id_header, sizeof(id_header), cd_f);\r
-\r
- /* it seems we have a CD image here. Try to detect region now.. */\r
- pm_seek(cd_f, (type == CT_ISO) ? 0x100+0x10B : 0x110+0x10B, SEEK_SET);\r
- pm_read(buf, 1, cd_f);\r
- pm_close(cd_f);\r
-\r
- if (buf[0] == 0x64) region = 8; // EU\r
- if (buf[0] == 0xa1) region = 1; // JAP\r
-\r
- lprintf("detected %s Sega/Mega CD image with %s region\n",\r
- type == CT_BIN ? "BIN" : "ISO", region != 4 ? (region == 8 ? "EU" : "JAP") : "USA");\r
-\r
- if (pregion != NULL) *pregion = region;\r
-\r
- return type;\r
-}\r
-\r
-static int detect_media(const char *fname)\r
-{\r
- static const short sms_offsets[] = { 0x7ff0, 0x3ff0, 0x1ff0 };\r
- pm_file *pmf;\r
- char buff[32];\r
- char ext[5];\r
- int i;\r
-\r
- get_ext(fname, ext);\r
-\r
- // detect wrong extensions\r
- if (!strcmp(ext, ".srm") || !strcmp(ext, "s.gz") || !strcmp(ext, ".mds")) // s.gz ~ .mds.gz\r
- return PM_BAD;\r
-\r
- /* don't believe in extensions, except .cue */\r
- if (strcasecmp(ext, ".cue") == 0)\r
- return PM_CD;\r
-\r
- pmf = pm_open(fname);\r
- if (pmf == NULL)\r
- return PM_BAD;\r
-\r
- if (pm_read(buff, 32, pmf) != 32) {\r
- pm_close(pmf);\r
- return PM_BAD;\r
- }\r
-\r
- if (strncasecmp("SEGADISCSYSTEM", buff + 0x00, 14) == 0 ||\r
- strncasecmp("SEGADISCSYSTEM", buff + 0x10, 14) == 0) {\r
- pm_close(pmf);\r
- return PM_CD;\r
- }\r
-\r
- for (i = 0; i < array_size(sms_offsets); i++) {\r
- if (pm_seek(pmf, sms_offsets[i], SEEK_SET) != sms_offsets[i])\r
- goto not_mark3; /* actually it could be but can't be detected */\r
-\r
- if (pm_read(buff, 16, pmf) != 16)\r
- goto not_mark3;\r
-\r
- if (strncasecmp("TMR SEGA", buff, 8) == 0) {\r
- pm_close(pmf);\r
- return PM_MARK3;\r
- }\r
- }\r
-\r
-not_mark3:\r
- pm_close(pmf);\r
- /* the main emu function is to emulate MD, so assume MD */\r
- return PM_MD_CART;\r
-}\r
-\r