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62 lines
2.1 KiB
C++
62 lines
2.1 KiB
C++
//
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// MFMSectorDump.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 30/09/2017.
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// Copyright 2017 Thomas Harte. All rights reserved.
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//
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#include "MFMSectorDump.hpp"
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#include "Utility/ImplicitSectors.hpp"
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using namespace Storage::Disk;
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MFMSectorDump::MFMSectorDump(const std::string &file_name) : file_(file_name) {}
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void MFMSectorDump::set_geometry(int sectors_per_track, uint8_t sector_size, uint8_t first_sector, bool is_double_density) {
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sectors_per_track_ = sectors_per_track;
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sector_size_ = sector_size;
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is_double_density_ = is_double_density;
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first_sector_ = first_sector;
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}
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std::shared_ptr<Track> MFMSectorDump::get_track_at_position(Track::Address address) {
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if(address.head >= get_head_count()) return nullptr;
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if(address.position.as_largest() >= get_maximum_head_position().as_largest()) return nullptr;
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uint8_t sectors[(128 << sector_size_)*sectors_per_track_];
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const long file_offset = get_file_offset_for_position(address);
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{
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std::lock_guard lock_guard(file_.get_file_access_mutex());
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file_.seek(file_offset, SEEK_SET);
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file_.read(sectors, sizeof(sectors));
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}
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return track_for_sectors(sectors, sectors_per_track_, uint8_t(address.position.as_int()), uint8_t(address.head), first_sector_, sector_size_, is_double_density_);
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}
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void MFMSectorDump::set_tracks(const std::map<Track::Address, std::shared_ptr<Track>> &tracks) {
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uint8_t parsed_track[(128 << sector_size_)*sectors_per_track_];
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// TODO: it would be more efficient from a file access and locking point of view to parse the sectors
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// in one loop, then write in another.
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for(const auto &track : tracks) {
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// Assumption here: sector IDs will run from 0.
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decode_sectors(*track.second, parsed_track, first_sector_, first_sector_ + uint8_t(sectors_per_track_-1), sector_size_, is_double_density_);
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const long file_offset = get_file_offset_for_position(track.first);
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std::lock_guard lock_guard(file_.get_file_access_mutex());
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file_.ensure_is_at_least_length(file_offset);
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file_.seek(file_offset, SEEK_SET);
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file_.write(parsed_track, sizeof(parsed_track));
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}
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file_.flush();
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}
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bool MFMSectorDump::get_is_read_only() {
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return file_.get_is_known_read_only();
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}
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