mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-03 08:05:40 +00:00
81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
//
|
|
// StaticAnalyser.cpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 20/09/2018.
|
|
// Copyright © 2018 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#include "StaticAnalyser.hpp"
|
|
|
|
#include "Target.hpp"
|
|
|
|
#include <algorithm>
|
|
#include <cstring>
|
|
|
|
Analyser::Static::TargetList Analyser::Static::Sega::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType) {
|
|
if(media.cartridges.empty())
|
|
return {};
|
|
|
|
TargetList targets;
|
|
auto target = std::make_unique<Target>();
|
|
|
|
// Files named .sg are treated as for the SG1000; otherwise assume a Master System.
|
|
if(file_name.size() >= 2 && *(file_name.end() - 2) == 's' && *(file_name.end() - 1) == 'g') {
|
|
target->model = Target::Model::SG1000;
|
|
} else {
|
|
target->model = Target::Model::MasterSystem;
|
|
}
|
|
|
|
// If this is a Master System title, look for a ROM header.
|
|
if(target->model == Target::Model::MasterSystem) {
|
|
const auto &data = media.cartridges.front()->get_segments()[0].data;
|
|
|
|
// First try to locate a header.
|
|
size_t header_offset = 0;
|
|
size_t potential_offsets[] = {0x1ff0, 0x3ff0, 0x7ff0};
|
|
for(auto potential_offset: potential_offsets) {
|
|
if(!memcmp(&data[potential_offset], "TMR SEGA", 8)) {
|
|
header_offset = potential_offset;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If a header was found, use it to crib region.
|
|
if(header_offset) {
|
|
// Treat export titles as European by default; decline to
|
|
// do so only if (US) or (NTSC) is in the file name.
|
|
const uint8_t region = data[header_offset + 0x0f] >> 4;
|
|
switch(region) {
|
|
default: break;
|
|
case 4: {
|
|
std::string lowercase_name = file_name;
|
|
std::transform(lowercase_name.begin(), lowercase_name.end(), lowercase_name.begin(), ::tolower);
|
|
if(lowercase_name.find("(jp)") == std::string::npos) {
|
|
target->region =
|
|
(lowercase_name.find("(us)") == std::string::npos &&
|
|
lowercase_name.find("(ntsc)") == std::string::npos) ? Target::Region::Europe : Target::Region::USA;
|
|
}
|
|
} break;
|
|
}
|
|
|
|
// Also check for a Codemasters header.
|
|
// If one is found, set the paging scheme appropriately.
|
|
const uint16_t inverse_checksum = uint16_t(0x10000 - (data[0x7fe6] | (data[0x7fe7] << 8)));
|
|
if(
|
|
data[0x7fe3] >= 0x87 && data[0x7fe3] < 0x96 && // i.e. game is dated between 1987 and 1996
|
|
(inverse_checksum&0xff) == data[0x7fe8] &&
|
|
(inverse_checksum >> 8) == data[0x7fe9] && // i.e. the standard checksum appears to be present
|
|
!data[0x7fea] && !data[0x7feb] && !data[0x7fec] && !data[0x7fed] && !data[0x7fee] && !data[0x7fef]
|
|
) {
|
|
target->paging_scheme = Target::PagingScheme::Codemasters;
|
|
target->model = Target::Model::MasterSystem2;
|
|
}
|
|
}
|
|
}
|
|
|
|
target->media.cartridges = media.cartridges;
|
|
targets.push_back(std::move(target));
|
|
return targets;
|
|
}
|