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