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more sms wip, better ROM detect, line callback change

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@762 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2009-08-27 21:44:52 +00:00
parent 200772b790
commit 87b0845f37
19 changed files with 414 additions and 186 deletions
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71
platform/common/emu.c
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@ -245,8 +245,11 @@ static int emu_cd_check(int *pregion, const char *fname_in)
static int detect_media(const char *fname)
{
static const short sms_offsets[] = { 0x7ff0, 0x3ff0, 0x1ff0 };
static const char *sms_exts[] = { "sms", "gg", "sg" };
static const char *md_exts[] = { "gen", "bin", "smd" };
char buff0[32], buff[32];
unsigned short *d16;
pm_file *pmf;
char buff[32];
char ext[5];
int i;
@ -264,34 +267,69 @@ static int detect_media(const char *fname)
if (pmf == NULL)
return PM_BAD;
if (pm_read(buff, 32, pmf) != 32) {
if (pm_read(buff0, 32, pmf) != 32) {
pm_close(pmf);
return PM_BAD;
}
if (strncasecmp("SEGADISCSYSTEM", buff + 0x00, 14) == 0 ||
strncasecmp("SEGADISCSYSTEM", buff + 0x10, 14) == 0) {
if (strncasecmp("SEGADISCSYSTEM", buff0 + 0x00, 14) == 0 ||
strncasecmp("SEGADISCSYSTEM", buff0 + 0x10, 14) == 0) {
pm_close(pmf);
return PM_CD;
}
for (i = 0; i < array_size(sms_offsets); i++) {
if (pm_seek(pmf, sms_offsets[i], SEEK_SET) != sms_offsets[i])
goto not_mark3; /* actually it could be but can't be detected */
/* check for SMD evil */
if (pmf->size >= 0x4200 && (pmf->size & 0x3fff) == 0x200) {
if (pm_seek(pmf, sms_offsets[0] + 0x200, SEEK_SET) == sms_offsets[0] + 0x200 &&
pm_read(buff, 16, pmf) == 16 &&
strncmp("TMR SEGA", buff, 8) == 0)
goto looks_like_sms;
if (pm_read(buff, 16, pmf) != 16)
goto not_mark3;
if (strncasecmp("TMR SEGA", buff, 8) == 0) {
pm_close(pmf);
return PM_MARK3;
}
/* could parse further but don't bother */
goto extension_check;
}
not_mark3:
/* MD header? Act as TMSS BIOS here */
if (pm_seek(pmf, 0x100, SEEK_SET) == 0x100 && pm_read(buff, 16, pmf) == 16) {
if (strncmp(buff, "SEGA", 4) == 0 || strncmp(buff, " SEG", 4) == 0)
goto looks_like_md;
}
for (i = 0; i < array_size(sms_offsets); i++) {
if (pm_seek(pmf, sms_offsets[i], SEEK_SET) != sms_offsets[i])
continue;
if (pm_read(buff, 16, pmf) != 16)
continue;
if (strncmp("TMR SEGA", buff, 8) == 0)
goto looks_like_sms;
}
extension_check:
/* probably some headerless thing. Maybe check the extension after all. */
for (i = 0; i < array_size(md_exts); i++)
if (strcasecmp(pmf->ext, md_exts[i]) == 0)
goto looks_like_md;
for (i = 0; i < array_size(sms_exts); i++)
if (strcasecmp(pmf->ext, sms_exts[i]) == 0)
goto looks_like_sms;
/* If everything else fails, make a guess on the reset vector */
d16 = (unsigned short *)(buff0 + 4);
if ((((d16[0] << 16) | d16[1]) & 0xffffff) >= pmf->size) {
lprintf("bad MD reset vector, assuming SMS\n");
goto looks_like_sms;
}
looks_like_md:
pm_close(pmf);
/* the main emu function is to emulate MD, so assume MD */
return PM_MD_CART;
looks_like_sms:
pm_close(pmf);
return PM_MARK3;
}
static int extract_text(char *dest, const unsigned char *src, int len, int swab)
@ -450,6 +488,7 @@ int emu_reload_rom(char *rom_fname)
shutdown_MCD();
PicoPatchUnload();
PicoAHW = 0;
if (media_type == PM_CD)
{