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Backport SBI loading code

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This commit is contained in:
twinaphex 2015-08-10 11:47:05 +02:00
parent c303979881
commit 3144bbdeb5
2 changed files with 84 additions and 0 deletions
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76
mednafen/cdrom/CDAccess_Image.cpp
View File

@ -284,6 +284,51 @@ void CDAccess_Image::ParseTOCFileLineInfo(CDRFILE_TRACK_INFO *track, const int t
track->sectors = sectors;
}
void CDAccess_Image::LoadSBI(const char* sbi_path)
{
/* Loading SBI file */
{
FileStream sbis(sbi_path, MODE_READ);
uint8 header[4];
uint8 ed[4 + 10];
uint8 tmpq[12];
sbis.read(header, 4);
if(memcmp(header, "SBI\0", 4))
throw MDFN_Error(0, _("Not recognized a valid SBI file."));
while(sbis.read(ed, sizeof(ed), false) == sizeof(ed))
{
if(!BCD_is_valid(ed[0]) || !BCD_is_valid(ed[1]) || !BCD_is_valid(ed[2]))
throw MDFN_Error(0, _("Bad BCD MSF offset in SBI file: %02x:%02x:%02x"), ed[0], ed[1], ed[2]);
if(ed[3] != 0x01)
throw MDFN_Error(0, _("Unrecognized boogly oogly in SBI file: %02x"), ed[3]);
memcpy(tmpq, &ed[4], 10);
//
subq_generate_checksum(tmpq);
tmpq[10] ^= 0xFF;
tmpq[11] ^= 0xFF;
//
//printf("%02x:%02x:%02x --- ", ed[0], ed[1], ed[2]);
//for(unsigned i = 0; i < 12; i++)
// printf("%02x ", tmpq[i]);
//printf("\n");
uint32 aba = AMSF_to_ABA(BCD_to_U8(ed[0]), BCD_to_U8(ed[1]), BCD_to_U8(ed[2]));
memcpy(SubQReplaceMap[aba].data, tmpq, 12);
}
//MDFN_printf(_("Loaded Q subchannel replacements for %zu sectors.\n"), SubQReplaceMap.size());
}
}
void CDAccess_Image::ImageOpen(const char *path, bool image_memcache)
{
MemoryStream fp(new FileStream(path, MODE_READ));
@ -791,6 +836,25 @@ void CDAccess_Image::ImageOpen(const char *path, bool image_memcache)
} // end to track loop
total_sectors = RunningLBA;
//
// Load SBI file, if present
//
if(!IsTOC)
{
char sbi_ext[4] = { 's', 'b', 'i', 0 };
if(file_ext.length() == 4 && file_ext[0] == '.')
{
for(unsigned i = 0; i < 3; i++)
{
if(file_ext[1 + i] >= 'A' && file_ext[1 + i] <= 'Z')
sbi_ext[i] += 'A' - 'a';
}
}
LoadSBI(MDFN_EvalFIP(base_dir, file_base + std::string(".") + std::string(sbi_ext), true).c_str());
}
}
void CDAccess_Image::Cleanup(void)
@ -1058,6 +1122,18 @@ void CDAccess_Image::MakeSubPQ(int32 lba, uint8 *SubPWBuf)
subq_generate_checksum(buf);
if(!SubQReplaceMap.empty())
{
//printf("%d\n", lba);
std::map<uint32, cpp11_array_doodad>::const_iterator it = SubQReplaceMap.find(LBA_to_ABA(lba));
if(it != SubQReplaceMap.end())
{
//printf("Replace: %d\n", lba);
memcpy(buf, it->second.data, 12);
}
}
for (i = 0; i < 96; i++)
SubPWBuf[i] |= (((buf[i >> 3] >> (7 - (i & 0x7))) & 1) ? 0x40 : 0x00) | pause_or;
}

8
mednafen/cdrom/CDAccess_Image.h
View File

@ -53,9 +53,17 @@ class CDAccess_Image : public CDAccess
uint8_t disc_type;
CDRFILE_TRACK_INFO Tracks[100]; // Track #0(HMM?) through 99
struct cpp11_array_doodad
{
uint8 data[12];
};
std::map<uint32, cpp11_array_doodad> SubQReplaceMap;
std::string base_dir;
void ImageOpen(const char *path, bool image_memcache);
void LoadSBI(const char* sbi_path);
void Cleanup(void);
// MakeSubPQ will OR the simulated P and Q subchannel data into SubPWBuf.