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63 lines
2.4 KiB
C++
63 lines
2.4 KiB
C++
//
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// ImplicitSectors.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 29/09/2017.
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// Copyright 2017 Thomas Harte. All rights reserved.
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//
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#include "ImplicitSectors.hpp"
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#include <cstring>
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#include "../../../Encodings/MFM/Sector.hpp"
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#include "../../../Encodings/MFM/Encoder.hpp"
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#include "../../../Encodings/MFM/Constants.hpp"
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#include "../../../Track/TrackSerialiser.hpp"
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#include "../../../Encodings/MFM/SegmentParser.hpp"
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using namespace Storage::Disk;
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std::shared_ptr<Track> Storage::Disk::track_for_sectors(uint8_t *const source, int number_of_sectors, uint8_t track, uint8_t side, uint8_t first_sector, uint8_t size, bool is_double_density) {
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std::vector<Storage::Encodings::MFM::Sector> sectors;
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off_t byte_size = static_cast<off_t>(128 << size);
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off_t source_pointer = 0;
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for(int sector = 0; sector < number_of_sectors; sector++) {
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sectors.emplace_back();
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Storage::Encodings::MFM::Sector &new_sector = sectors.back();
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new_sector.address.track = track;
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new_sector.address.side = side;
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new_sector.address.sector = first_sector;
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first_sector++;
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new_sector.size = size;
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new_sector.samples.emplace_back();
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new_sector.samples[0].insert(new_sector.samples[0].begin(), source + source_pointer, source + source_pointer + byte_size);
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source_pointer += byte_size;
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}
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if(sectors.size()) {
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return is_double_density ? Storage::Encodings::MFM::GetMFMTrackWithSectors(sectors) : Storage::Encodings::MFM::GetFMTrackWithSectors(sectors);
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}
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return nullptr;
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}
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void Storage::Disk::decode_sectors(Track &track, uint8_t *const destination, uint8_t first_sector, uint8_t last_sector, uint8_t sector_size, bool is_double_density) {
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std::map<std::size_t, Storage::Encodings::MFM::Sector> sectors =
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Storage::Encodings::MFM::sectors_from_segment(
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Storage::Disk::track_serialisation(track, is_double_density ? Storage::Encodings::MFM::MFMBitLength : Storage::Encodings::MFM::FMBitLength),
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is_double_density);
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std::size_t byte_size = static_cast<std::size_t>(128 << sector_size);
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for(const auto &pair : sectors) {
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if(pair.second.address.sector > last_sector) continue;
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if(pair.second.address.sector < first_sector) continue;
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if(pair.second.size != sector_size) continue;
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if(pair.second.samples.empty()) continue;
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std::memcpy(&destination[pair.second.address.sector * byte_size], pair.second.samples[0].data(), std::min(pair.second.samples[0].size(), byte_size));
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}
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}
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