static MDFN_COLD bool DetectSGXCD(std::vector<CDIF*>* CDInterfaces)
{
CDIF *cdiface = (*CDInterfaces)[0];
CDUtility::TOC toc;
uint8 sector_buffer[2048];
bool ret = false;
memset(sector_buffer, 0, sizeof(sector_buffer));
cdiface->ReadTOC(&toc);
// Check all data tracks for the 16-byte magic(4D 65 64 6E 61 66 65 6E 74 AB 90 19 42 62 7D E6) at offset 0x86A(assuming mode 1 sectors).
for(int32 track = toc.first_track; track <= toc.last_track; track++)
{
if(toc.tracks[track].control & 0x4)
{
if(cdiface->ReadSector(sector_buffer, toc.tracks[track].lba + 1, 1) != 0x1)
continue;
if(MDFN_de64msb(§or_buffer[0x6A]) == 0x4D65646E6166656EULL && MDFN_de64msb(§or_buffer[0x6A + 8]) == 0x74AB901942627DE6ULL)
ret = true;
}
}
return ret;
}
static MDFN_COLD bool TestMagicCD(std::vector<CDIF *> *CDInterfaces)
{
static const uint8 magic_test[0x20] = { 0x82, 0xB1, 0x82, 0xCC, 0x83, 0x76, 0x83, 0x8D, 0x83, 0x4F, 0x83, 0x89, 0x83, 0x80, 0x82, 0xCC,
0x92, 0x98, 0x8D, 0xEC, 0x8C, 0xA0, 0x82, 0xCD, 0x8A, 0x94, 0x8E, 0xAE, 0x89, 0xEF, 0x8E, 0xD0
};
uint8 sector_buffer[2048];
CDIF *cdiface = (*CDInterfaces)[0];
CDUtility::TOC toc;
bool ret = false;
memset(sector_buffer, 0, sizeof(sector_buffer));
cdiface->ReadTOC(&toc);
for(int32 track = toc.first_track; track <= toc.last_track; track++)
{
if(toc.tracks[track].control & 0x4)
{
if(cdiface->ReadSector(sector_buffer, toc.tracks[track].lba, 1) != 0x1)
break;
if(!memcmp((char*)sector_buffer, (char *)magic_test, 0x20))
ret = true;
// PCE CD BIOS apparently only looks at the first data track.
break;
}
}
// If it's a PC-FX CD(Battle Heat), return false.
// This is very kludgy.
for(int32 track = toc.first_track; track <= toc.last_track; track++)
{
if(toc.tracks[track].control & 0x4)
{
if(cdiface->ReadSector(sector_buffer, toc.tracks[track].lba, 1) == 0x1)
{
if(!strncmp("PC-FX:Hu_CD-ROM", (char*)sector_buffer, strlen("PC-FX:Hu_CD-ROM")))
{
return false;
}
}
}
}
// Now, test for the Games Express CD games. The GE BIOS seems to always look at sector 0x10, but only if the first track is a
// data track.
if(toc.first_track == 1 && (toc.tracks[1].control & 0x4))
{
if(cdiface->ReadSector(sector_buffer, 0x10, 1) == 0x1)
{
if(!memcmp((char *)sector_buffer + 0x8, "HACKER CD ROM SYSTEM", 0x14))
{
ret = true;
}
}
}
return(ret);
}
uint64 CDIF_Stream_Thing::read(void *data, uint64 count, bool error_on_eos)
{
if(count > (((uint64)sector_count * 2048) - position))
{
if(error_on_eos)
{
throw MDFN_Error(0, "EOF");
}
count = ((uint64)sector_count * 2048) - position;
}
if(!count)
return(0);
for(uint64 rp = position; rp < (position + count); rp = (rp &~ 2047) + 2048)
{
uint8 buf[2048];
if(!cdintf->ReadSector(buf, start_lba + (rp / 2048), 1))
{
throw MDFN_Error(ErrnoHolder(EIO));
}
//::printf("Meow: %08llx -- %08llx\n", count, (rp - position) + std::min<uint64>(2048 - (rp & 2047), count - (rp - position)));
memcpy((uint8*)data + (rp - position), buf + (rp & 2047), std::min<uint64>(2048 - (rp & 2047), count - (rp - position)));
}
position += count;
return count;
}
uint64 CDIF_Stream_Thing::read(void *data, uint64 count, bool error_on_eos)
{
if(count > (((uint64)sector_count * 2048) - position))
count = ((uint64)sector_count * 2048) - position;
if(!count)
return(0);
for(uint64 rp = position; rp < (position + count); rp = (rp &~ 2047) + 2048)
{
uint8 buf[2048];
cdintf->ReadSector(buf, start_lba + (rp / 2048), 1);
memcpy((uint8*)data + (rp - position), buf + (rp & 2047), std::min<uint64>(2048 - (rp & 2047), count - (rp - position)));
}
position += count;
return count;
}
