save_error save_manager::write_file(emu_file &file)
{
// if we have illegal registrations, return an error
if (m_illegal_regs > 0)
return STATERR_ILLEGAL_REGISTRATIONS;
// generate the header
UINT8 header[HEADER_SIZE];
memcpy(&header[0], emulator_info::get_state_magic_num(), 8);
header[8] = SAVE_VERSION;
header[9] = NATIVE_ENDIAN_VALUE_LE_BE(0, SS_MSB_FIRST);
strncpy((char *)&header[0x0a], machine().system().name, 0x1c - 0x0a);
UINT32 sig = signature();
*(UINT32 *)&header[0x1c] = LITTLE_ENDIANIZE_INT32(sig);
// write the header and turn on compression for the rest of the file
file.compress(FCOMPRESS_NONE);
file.seek(0, SEEK_SET);
if (file.write(header, sizeof(header)) != sizeof(header))
return STATERR_WRITE_ERROR;
file.compress(FCOMPRESS_MEDIUM);
// call the pre-save functions
for (state_callback *func = m_presave_list.first(); func != NULL; func = func->next())
func->m_func();
// then write all the data
for (state_entry *entry = m_entry_list.first(); entry != NULL; entry = entry->next())
{
UINT32 totalsize = entry->m_typesize * entry->m_typecount;
if (file.write(entry->m_data, totalsize) != totalsize)
return STATERR_WRITE_ERROR;
}
return STATERR_NONE;
}
save_error save_manager::read_file(emu_file &file)
{
// if we have illegal registrations, return an error
if (m_illegal_regs > 0)
return STATERR_ILLEGAL_REGISTRATIONS;
// read the header and turn on compression for the rest of the file
file.compress(FCOMPRESS_NONE);
file.seek(0, SEEK_SET);
UINT8 header[HEADER_SIZE];
if (file.read(header, sizeof(header)) != sizeof(header))
return STATERR_READ_ERROR;
file.compress(FCOMPRESS_MEDIUM);
// verify the header and report an error if it doesn't match
// JJG: Allow invalid headers
//UINT32 sig = signature();
//if (validate_header(header, machine().system().name, sig, popmessage, "Error: ") != STATERR_NONE)
//return STATERR_INVALID_HEADER;
// determine whether or not to flip the data when done
bool flip = NATIVE_ENDIAN_VALUE_LE_BE((header[9] & SS_MSB_FIRST) != 0, (header[9] & SS_MSB_FIRST) == 0);
// read all the data, flipping if necessary
for (state_entry *entry = m_entry_list.first(); entry != NULL; entry = entry->next())
{
UINT32 totalsize = entry->m_typesize * entry->m_typecount;
if (file.read(entry->m_data, totalsize) != totalsize)
return STATERR_READ_ERROR;
// handle flipping
if (flip)
entry->flip_data();
}
// call the post-load functions
for (state_callback *func = m_postload_list.first(); func != NULL; func = func->next())
func->m_func();
return STATERR_NONE;
}
save_error save_manager::check_file(running_machine &machine, emu_file &file, const char *gamename, void (CLIB_DECL *errormsg)(const char *fmt, ...))
{
// if we want to validate the signature, compute it
UINT32 sig = 0;
sig = machine.save().signature();
// seek to the beginning and read the header
file.compress(FCOMPRESS_NONE);
file.seek(0, SEEK_SET);
UINT8 header[HEADER_SIZE];
if (file.read(header, sizeof(header)) != sizeof(header))
{
if (errormsg != NULL)
(*errormsg)("Could not read %s save file header",emulator_info::get_appname());
return STATERR_READ_ERROR;
}
// let the generic header check work out the rest
return validate_header(header, gamename, sig, errormsg, "");
}