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248 lines
7.4 KiB
C++
248 lines
7.4 KiB
C++
//
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// AmstradCPC.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 30/07/2017.
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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 <algorithm>
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#include <cstring>
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#include "Target.hpp"
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#include "../../../Storage/Disk/Parsers/CPM.hpp"
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#include "../../../Storage/Disk/Encodings/MFM/Parser.hpp"
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static bool strcmp_insensitive(const char *a, const char *b) {
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if(std::strlen(a) != std::strlen(b)) return false;
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while(*a) {
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if(std::tolower(*a) != std::tolower(*b)) return false;
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a++;
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b++;
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}
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return true;
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}
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static bool is_implied_extension(const std::string &extension) {
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return
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extension == " " ||
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strcmp_insensitive(extension.c_str(), "BAS") ||
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strcmp_insensitive(extension.c_str(), "BIN");
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}
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static void right_trim(std::string &string) {
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string.erase(std::find_if(string.rbegin(), string.rend(), [](int ch) {
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return !std::isspace(ch);
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}).base(), string.end());
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}
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static std::string RunCommandFor(const Storage::Disk::CPM::File &file) {
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// Trim spaces from the name.
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std::string name = file.name;
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right_trim(name);
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// Form the basic command.
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std::string command = "run\"" + name;
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// Consider whether the extension is required.
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if(!is_implied_extension(file.type)) {
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std::string type = file.type;
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right_trim(type);
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command += "." + type;
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}
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// Add a newline and return.
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return command + "\n";
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}
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static void InspectCatalogue(
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const Storage::Disk::CPM::Catalogue &catalogue,
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const std::unique_ptr<Analyser::Static::AmstradCPC::Target> &target) {
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std::vector<const Storage::Disk::CPM::File *> candidate_files;
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candidate_files.reserve(catalogue.files.size());
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for(const auto &file : catalogue.files) {
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candidate_files.push_back(&file);
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}
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// Remove all files with untypable characters.
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candidate_files.erase(
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std::remove_if(candidate_files.begin(), candidate_files.end(), [](const Storage::Disk::CPM::File *file) {
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for(const auto c : file->name + file->type) {
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if(c < 32) return true;
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}
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return false;
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}),
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candidate_files.end());
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// If that leaves a mix of 'system' (i.e. hidden) and non-system files, remove the system files.
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bool are_all_system = true;
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for(const auto &file : candidate_files) {
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if(!file->system) {
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are_all_system = false;
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break;
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}
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}
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if(!are_all_system) {
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candidate_files.erase(
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std::remove_if(candidate_files.begin(), candidate_files.end(), [](const Storage::Disk::CPM::File *file) {
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return file->system;
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}),
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candidate_files.end());
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}
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// If there's just one file, run that.
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if(candidate_files.size() == 1) {
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target->loading_command = RunCommandFor(*candidate_files[0]);
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return;
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}
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// If only one file is [potentially] BASIC, run that one; otherwise if only one has a suffix
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// that AMSDOS allows to be omitted, pick that one.
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int basic_files = 0;
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int implicit_suffixed_files = 0;
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std::size_t last_basic_file = 0;
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std::size_t last_implicit_suffixed_file = 0;
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for(std::size_t c = 0; c < candidate_files.size(); c++) {
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// Files with nothing but spaces in their name can't be loaded by the user, so disregard them.
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if(candidate_files[c]->type == " " && candidate_files[c]->name == " ")
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continue;
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// Check for whether this is [potentially] BASIC.
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if(candidate_files[c]->data.size() >= 128 && !((candidate_files[c]->data[18] >> 1) & 7)) {
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basic_files++;
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last_basic_file = c;
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}
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// Check suffix for emptiness.
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if(is_implied_extension(candidate_files[c]->type)) {
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implicit_suffixed_files++;
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last_implicit_suffixed_file = c;
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}
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}
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if(basic_files == 1 || implicit_suffixed_files == 1) {
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std::size_t selected_file = (basic_files == 1) ? last_basic_file : last_implicit_suffixed_file;
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target->loading_command = RunCommandFor(*candidate_files[selected_file]);
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return;
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}
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// One more guess: if only one remaining candidate file has a different name than the others,
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// assume it is intended to stand out.
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std::map<std::string, int> name_counts;
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std::map<std::string, std::size_t> indices_by_name;
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std::size_t index = 0;
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for(const auto &file : candidate_files) {
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name_counts[file->name]++;
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indices_by_name[file->name] = index;
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index++;
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}
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if(name_counts.size() == 2) {
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for(const auto &pair : name_counts) {
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if(pair.second == 1) {
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target->loading_command = RunCommandFor(*candidate_files[indices_by_name[pair.first]]);
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return;
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}
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}
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}
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// Desperation.
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target->loading_command = "cat\n";
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}
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static bool CheckBootSector(const std::shared_ptr<Storage::Disk::Disk> &disk, const std::unique_ptr<Analyser::Static::AmstradCPC::Target> &target) {
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Storage::Encodings::MFM::Parser parser(true, disk);
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Storage::Encodings::MFM::Sector *boot_sector = parser.get_sector(0, 0, 0x41);
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if(boot_sector != nullptr && !boot_sector->samples.empty() && boot_sector->samples[0].size() == 512) {
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// Check that the first 64 bytes of the sector aren't identical; if they are then probably
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// this disk was formatted and the filler byte never replaced.
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bool matched = true;
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for(std::size_t c = 1; c < 64; c++) {
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if(boot_sector->samples[0][c] != boot_sector->samples[0][0]) {
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matched = false;
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break;
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}
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}
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// This is a system disk, then launch it as though it were CP/M.
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if(!matched) {
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target->loading_command = "|cpm\n";
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return true;
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}
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}
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return false;
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}
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Analyser::Static::TargetList Analyser::Static::AmstradCPC::GetTargets(const Media &media, const std::string &file_name, TargetPlatform::IntType potential_platforms) {
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TargetList destination;
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std::unique_ptr<Target> target(new Target);
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target->machine = Machine::AmstradCPC;
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target->confidence = 0.5;
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target->model = Target::Model::CPC6128;
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if(!media.tapes.empty()) {
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// TODO: which of these are actually potentially CPC tapes?
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target->media.tapes = media.tapes;
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// Ugliness flows here: assume the CPC isn't smart enough to pause between pressing
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// enter and responding to the follow-on prompt to press a key, so just type for
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// a while. Yuck!
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target->loading_command = "|tape\nrun\"\n1234567890";
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}
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if(!media.disks.empty()) {
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Storage::Disk::CPM::ParameterBlock data_format;
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data_format.sectors_per_track = 9;
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data_format.tracks = 40;
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data_format.block_size = 1024;
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data_format.first_sector = 0xc1;
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data_format.catalogue_allocation_bitmap = 0xc000;
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data_format.reserved_tracks = 0;
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Storage::Disk::CPM::ParameterBlock system_format;
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system_format.sectors_per_track = 9;
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system_format.tracks = 40;
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system_format.block_size = 1024;
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system_format.first_sector = 0x41;
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system_format.catalogue_allocation_bitmap = 0xc000;
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system_format.reserved_tracks = 2;
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for(auto &disk: media.disks) {
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// Check for an ordinary catalogue.
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std::unique_ptr<Storage::Disk::CPM::Catalogue> data_catalogue = Storage::Disk::CPM::GetCatalogue(disk, data_format);
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if(data_catalogue) {
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InspectCatalogue(*data_catalogue, target);
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target->media.disks.push_back(disk);
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continue;
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}
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// Failing that check for a boot sector.
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if(CheckBootSector(disk, target)) {
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target->media.disks.push_back(disk);
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continue;
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}
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// Failing that check for a system catalogue.
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std::unique_ptr<Storage::Disk::CPM::Catalogue> system_catalogue = Storage::Disk::CPM::GetCatalogue(disk, system_format);
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if(system_catalogue) {
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InspectCatalogue(*system_catalogue, target);
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target->media.disks.push_back(disk);
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continue;
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}
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}
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}
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// If any media survived, add the target.
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if(!target->media.empty())
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destination.push_back(std::move(target));
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return destination;
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}
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