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65 lines
2.5 KiB
C++
65 lines
2.5 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 23/02/2018.
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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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static std::vector<std::shared_ptr<Storage::Cartridge::Cartridge>>
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ColecoCartridgesFrom(const std::vector<std::shared_ptr<Storage::Cartridge::Cartridge>> &cartridges) {
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std::vector<std::shared_ptr<Storage::Cartridge::Cartridge>> coleco_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 8, 12, 16, 24 or 32 kb in size
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const Storage::Cartridge::Cartridge::Segment &segment = segments.front();
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const std::size_t data_size = segment.data.size();
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const std::size_t overflow = data_size&8191;
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if(overflow > 8 && overflow != 512 && (data_size != 12*1024)) continue;
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if(data_size < 8192) continue;
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// the two bytes that will be first must be 0xaa and 0x55, either way around
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auto *start = &segment.data[0];
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if((data_size & static_cast<std::size_t>(~8191)) > 32768) {
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start = &segment.data[segment.data.size() - 16384];
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}
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if(start[0] != 0xaa && start[0] != 0x55 && start[1] != 0xaa && start[1] != 0x55) continue;
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if(start[0] == start[1]) continue;
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// probability of a random binary blob that isn't a Coleco ROM proceeding to here is 1 - 1/32768.
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if(!overflow) {
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coleco_cartridges.push_back(cartridge);
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} else {
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// Size down to a multiple of 8kb and apply the start address.
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std::vector<Storage::Cartridge::Cartridge::Segment> output_segments;
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std::vector<uint8_t> truncated_data;
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std::vector<uint8_t>::difference_type truncated_size = static_cast<std::vector<uint8_t>::difference_type>(segment.data.size()) & ~8191;
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truncated_data.insert(truncated_data.begin(), segment.data.begin(), segment.data.begin() + truncated_size);
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output_segments.emplace_back(0x8000, truncated_data);
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coleco_cartridges.emplace_back(new Storage::Cartridge::Cartridge(output_segments));
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}
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}
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return coleco_cartridges;
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}
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Analyser::Static::TargetList Analyser::Static::Coleco::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType potential_platforms) {
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TargetList targets;
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std::unique_ptr<Target> target(new Target);
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target->machine = Machine::ColecoVision;
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target->confidence = 1.0f - 1.0f / 32768.0f;
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target->media.cartridges = ColecoCartridgesFrom(media.cartridges);
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if(!target->media.empty())
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targets.push_back(std::move(target));
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return targets;
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}
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