static chd_error open_disk_diff(emu_options &options, const char *name, chd_file &source, chd_file &diff_chd)
{
std::string fname = std::string(name).append(".dif");
/* try to open the diff */
//printf("Opening differencing image file: %s\n", fname.c_str());
emu_file diff_file(options.diff_directory(), OPEN_FLAG_READ | OPEN_FLAG_WRITE);
osd_file::error filerr = diff_file.open(fname.c_str());
if (filerr == osd_file::error::NONE)
{
std::string fullpath(diff_file.fullpath());
diff_file.close();
//printf("Opening differencing image file: %s\n", fullpath.c_str());
return diff_chd.open(fullpath.c_str(), true, &source);
}
/* didn't work; try creating it instead */
//printf("Creating differencing image: %s\n", fname.c_str());
diff_file.set_openflags(OPEN_FLAG_READ | OPEN_FLAG_WRITE | OPEN_FLAG_CREATE | OPEN_FLAG_CREATE_PATHS);
filerr = diff_file.open(fname.c_str());
if (filerr == osd_file::error::NONE)
{
std::string fullpath(diff_file.fullpath());
diff_file.close();
/* create the CHD */
//printf("Creating differencing image file: %s\n", fupointllpath.c_str());
chd_codec_type compression[4] = { CHD_CODEC_NONE };
chd_error err = diff_chd.create(fullpath.c_str(), source.logical_bytes(), source.hunk_bytes(), compression, source);
if (err != CHDERR_NONE)
return err;
return diff_chd.clone_all_metadata(source);
}
return CHDERR_FILE_NOT_FOUND;
}
static chd_error open_disk_diff(emu_options &options, const rom_entry *romp, chd_file &source, chd_file &diff_chd)
{
astring fname(ROM_GETNAME(romp), ".dif");
/* try to open the diff */
LOG(("Opening differencing image file: %s\n", fname.cstr()));
emu_file diff_file(options.diff_directory(), OPEN_FLAG_READ | OPEN_FLAG_WRITE);
file_error filerr = diff_file.open(fname);
if (filerr == FILERR_NONE)
{
astring fullpath(diff_file.fullpath());
diff_file.close();
LOG(("Opening differencing image file: %s\n", fullpath.cstr()));
return diff_chd.open(fullpath, true, &source);
}
/* didn't work; try creating it instead */
LOG(("Creating differencing image: %s\n", fname.cstr()));
diff_file.set_openflags(OPEN_FLAG_READ | OPEN_FLAG_WRITE | OPEN_FLAG_CREATE | OPEN_FLAG_CREATE_PATHS);
filerr = diff_file.open(fname);
if (filerr == FILERR_NONE)
{
astring fullpath(diff_file.fullpath());
diff_file.close();
/* create the CHD */
LOG(("Creating differencing image file: %s\n", fullpath.cstr()));
chd_codec_type compression[4] = { CHD_CODEC_NONE };
chd_error err = diff_chd.create(fullpath, source.logical_bytes(), source.hunk_bytes(), compression, source);
if (err != CHDERR_NONE)
return err;
return diff_chd.clone_all_metadata(source);
}
return CHDERR_FILE_NOT_FOUND;
}