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999a0c22d4
In the sense that the file format itself is properly parsed, but the MSX doesn't actually yet have disk hardware.
225 lines
8.5 KiB
C++
225 lines
8.5 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 25/11/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#include "StaticAnalyser.hpp"
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#include "Tape.hpp"
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#include "../Disassembler/Z80.hpp"
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#include "../Disassembler/AddressMapper.hpp"
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#include <algorithm>
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/*
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Expected standard cartridge format:
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DEFB "AB" ; expansion ROM header
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DEFW initcode ; start of the init code, 0 if no initcode
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DEFW callstat; pointer to CALL statement handler, 0 if no such handler
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DEFW device; pointer to expansion device handler, 0 if no such handler
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DEFW basic ; pointer to the start of a tokenized basicprogram, 0 if no basicprogram
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DEFS 6,0 ; room reserved for future extensions
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*/
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static std::list<std::shared_ptr<Storage::Cartridge::Cartridge>>
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MSXCartridgesFrom(const std::list<std::shared_ptr<Storage::Cartridge::Cartridge>> &cartridges, StaticAnalyser::Target &target) {
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std::list<std::shared_ptr<Storage::Cartridge::Cartridge>> msx_cartridges;
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for(const auto &cartridge : cartridges) {
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const auto &segments = cartridge->get_segments();
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// Only one mapped item is allowed.
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if(segments.size() != 1) continue;
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// Which must be a multiple of 16 kb in size.
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Storage::Cartridge::Cartridge::Segment segment = segments.front();
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const size_t data_size = segment.data.size();
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if(data_size < 0x2000 || data_size & 0x3fff) continue;
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// Check for a ROM header at address 0; if it's not found then try 0x4000
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// and adjust the start address;
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uint16_t start_address = 0;
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bool found_start = false;
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if(segment.data[0] == 0x41 && segment.data[1] == 0x42) {
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start_address = 0x4000;
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found_start = true;
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} else if(segment.data.size() >= 0x8000 && segment.data[0x4000] == 0x41 && segment.data[0x4001] == 0x42) {
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start_address = 0;
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found_start = true;
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}
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// Reject cartridge if the ROM header wasn't found.
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if(!found_start) continue;
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uint16_t init_address = static_cast<uint16_t>(segment.data[2] | (segment.data[3] << 8));
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// TODO: check for a rational init address?
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// If this ROM is greater than 48kb in size then some sort of MegaROM scheme must
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// be at play; disassemble to try to figure it out.
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target.msx.cartridge_type = StaticAnalyser::MSXCartridgeType::None;
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if(data_size > 0xc000) {
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std::vector<uint8_t> first_16k;
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first_16k.insert(first_16k.begin(), segment.data.begin(), segment.data.begin() + 8192);
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StaticAnalyser::Z80::Disassembly disassembly =
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StaticAnalyser::Z80::Disassemble(
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first_16k,
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StaticAnalyser::Disassembler::OffsetMapper(start_address),
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{ init_address }
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);
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// Look for a indirect store followed by an unconditional JP or CALL into another
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// segment, that's a fairly explicit sign where found.
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using Instruction = StaticAnalyser::Z80::Instruction;
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std::map<uint16_t, Instruction> &instructions = disassembly.instructions_by_address;
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bool is_ascii = false;
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auto iterator = instructions.begin();
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while(iterator != instructions.end()) {
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auto next_iterator = iterator;
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next_iterator++;
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if(next_iterator == instructions.end()) break;
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if( iterator->second.operation == Instruction::Operation::LD &&
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iterator->second.destination == Instruction::Location::Operand_Indirect &&
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(
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iterator->second.operand == 0x5000 ||
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iterator->second.operand == 0x6000 ||
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iterator->second.operand == 0x6800 ||
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iterator->second.operand == 0x7000 ||
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iterator->second.operand == 0x77ff ||
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iterator->second.operand == 0x7800 ||
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iterator->second.operand == 0x8000 ||
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iterator->second.operand == 0x9000 ||
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iterator->second.operand == 0xa000
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) &&
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(
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next_iterator->second.operation == Instruction::Operation::CALL ||
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next_iterator->second.operation == Instruction::Operation::JP
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) &&
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((next_iterator->second.operand >> 13) != (0x4000 >> 13))
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) {
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const uint16_t address = static_cast<uint16_t>(next_iterator->second.operand);
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switch(iterator->second.operand) {
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case 0x6000:
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if(address >= 0x6000 && address < 0x8000) {
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target.msx.cartridge_type = StaticAnalyser::MSXCartridgeType::KonamiWithSCC;
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}
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break;
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case 0x6800:
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if(address >= 0x6000 && address < 0x6800) {
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target.msx.cartridge_type = StaticAnalyser::MSXCartridgeType::ASCII8kb;
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}
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break;
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case 0x7000:
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if(address >= 0x6000 && address < 0x8000) {
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target.msx.cartridge_type = StaticAnalyser::MSXCartridgeType::KonamiWithSCC;
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}
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if(address >= 0x7000 && address < 0x7800) {
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is_ascii = true;
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}
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break;
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case 0x77ff:
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if(address >= 0x7000 && address < 0x7800) {
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target.msx.cartridge_type = StaticAnalyser::MSXCartridgeType::ASCII16kb;
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}
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break;
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case 0x7800:
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if(address >= 0xa000 && address < 0xc000) {
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target.msx.cartridge_type = StaticAnalyser::MSXCartridgeType::ASCII8kb;
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}
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break;
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case 0x8000:
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if(address >= 0x8000 && address < 0xa000) {
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target.msx.cartridge_type = StaticAnalyser::MSXCartridgeType::KonamiWithSCC;
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}
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break;
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case 0x9000:
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if(address >= 0x8000 && address < 0xa000) {
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target.msx.cartridge_type = StaticAnalyser::MSXCartridgeType::KonamiWithSCC;
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}
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break;
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case 0xa000:
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if(address >= 0xa000 && address < 0xc000) {
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target.msx.cartridge_type = StaticAnalyser::MSXCartridgeType::Konami;
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}
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break;
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case 0xb000:
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if(address >= 0xa000 && address < 0xc000) {
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target.msx.cartridge_type = StaticAnalyser::MSXCartridgeType::KonamiWithSCC;
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}
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break;
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}
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}
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iterator = next_iterator;
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}
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if(target.msx.cartridge_type == StaticAnalyser::MSXCartridgeType::None) {
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// Look for LD (nnnn), A instructions, and collate those addresses.
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std::map<uint16_t, int> address_counts;
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for(const auto &instruction_pair : instructions) {
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if( instruction_pair.second.operation == Instruction::Operation::LD &&
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instruction_pair.second.destination == Instruction::Location::Operand_Indirect &&
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instruction_pair.second.source == Instruction::Location::A) {
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address_counts[static_cast<uint16_t>(instruction_pair.second.operand)]++;
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}
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}
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// Sort possible cartridge types.
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using Possibility = std::pair<StaticAnalyser::MSXCartridgeType, int>;
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std::vector<Possibility> possibilities;
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// Add to list in order of declining probability, so that stable_sort below prefers
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// the more likely option in a tie.
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possibilities.push_back(std::make_pair(StaticAnalyser::MSXCartridgeType::ASCII8kb, address_counts[0x6000] + address_counts[0x6800] + address_counts[0x7000] + address_counts[0x7800]));
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possibilities.push_back(std::make_pair(StaticAnalyser::MSXCartridgeType::ASCII16kb, address_counts[0x6000] + address_counts[0x7000] + address_counts[0x77ff]));
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if(!is_ascii) possibilities.push_back(std::make_pair(StaticAnalyser::MSXCartridgeType::Konami, address_counts[0x6000] + address_counts[0x8000] + address_counts[0xa000]));
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if(!is_ascii) possibilities.push_back(std::make_pair(StaticAnalyser::MSXCartridgeType::KonamiWithSCC, address_counts[0x5000] + address_counts[0x7000] + address_counts[0x9000] + address_counts[0xb000]));
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std::stable_sort(possibilities.begin(), possibilities.end(), [](const Possibility &a, const Possibility &b) {
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return a.second > b.second;
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});
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target.msx.cartridge_type = possibilities[0].first;
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}
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}
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// Apply the standard MSX start address.
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msx_cartridges.emplace_back(new Storage::Cartridge::Cartridge({
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Storage::Cartridge::Cartridge::Segment(start_address, segment.data)
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}));
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}
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return msx_cartridges;
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}
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void StaticAnalyser::MSX::AddTargets(const Media &media, std::list<Target> &destination) {
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Target target;
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// Obtain only those cartridges which it looks like an MSX would understand.
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target.media.cartridges = MSXCartridgesFrom(media.cartridges, target);
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// Check tapes for loadable files.
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for(const auto &tape : media.tapes) {
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std::vector<File> files_on_tape = GetFiles(tape);
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if(!files_on_tape.empty()) {
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switch(files_on_tape.front().type) {
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case File::Type::ASCII: target.loading_command = "RUN\"CAS:\r"; break;
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case File::Type::TokenisedBASIC: target.loading_command = "CLOAD\rRUN\r"; break;
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case File::Type::Binary: target.loading_command = "BLOAD\"CAS:\",R\r"; break;
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default: break;
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}
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target.media.tapes.push_back(tape);
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}
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}
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// Blindly accept disks for now.
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target.media.disks = media.disks;
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if(!target.media.empty()) {
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target.machine = Target::MSX;
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target.probability = 1.0;
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destination.push_back(target);
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}
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}
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