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CLK/Analyser/Static/Coleco/StaticAnalyser.cpp

64 lines
2.2 KiB
C++

//
// StaticAnalyser.cpp
// Clock Signal
//
// Created by Thomas Harte on 23/02/2018.
// Copyright 2018 Thomas Harte. All rights reserved.
//
#include "StaticAnalyser.hpp"
static std::vector<std::shared_ptr<Storage::Cartridge::Cartridge>>
ColecoCartridgesFrom(const std::vector<std::shared_ptr<Storage::Cartridge::Cartridge>> &cartridges) {
std::vector<std::shared_ptr<Storage::Cartridge::Cartridge>> coleco_cartridges;
for(const auto &cartridge : cartridges) {
const auto &segments = cartridge->get_segments();
// only one mapped item is allowed
if(segments.size() != 1) continue;
const Storage::Cartridge::Cartridge::Segment &segment = segments.front();
const std::size_t data_size = segment.data.size();
// the two bytes that will be first must be 0xaa and 0x55, either way around
auto *start = &segment.data[0];
if((data_size & size_t(~8191)) > 32768) {
start = &segment.data[segment.data.size() - 16384];
}
if(start[0] != 0xaa && start[0] != 0x55 && start[1] != 0xaa && start[1] != 0x55) continue;
if(start[0] == start[1]) continue;
// probability of a random binary blob that isn't a Coleco ROM proceeding to here is 1 - 1/32768.
// Round up to the next multiple of 8kb if this image is less than 32kb. Otherwise round down if
// this image is within a short distance of 32kb.
std::vector<Storage::Cartridge::Cartridge::Segment> output_segments;
size_t target_size;
if(data_size >= 32*1024 && data_size < 32*1024 + 512) {
target_size = 32 * 1024;
} else {
target_size = data_size + ((8192 - (data_size & 8191)) & 8191);
}
std::vector<uint8_t> truncated_data;
truncated_data = segment.data;
truncated_data.resize(target_size);
output_segments.emplace_back(0x8000, truncated_data);
coleco_cartridges.emplace_back(new Storage::Cartridge::Cartridge(output_segments));
}
return coleco_cartridges;
}
Analyser::Static::TargetList Analyser::Static::Coleco::GetTargets(const Media &media, const std::string &, TargetPlatform::IntType) {
TargetList targets;
auto target = std::make_unique<Target>(Machine::ColecoVision);
target->confidence = 1.0f - 1.0f / 32768.0f;
target->media.cartridges = ColecoCartridgesFrom(media.cartridges);
if(!target->media.empty())
targets.push_back(std::move(target));
return targets;
}