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76 lines
1.8 KiB
C++
76 lines
1.8 KiB
C++
//
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// SSD.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 18/09/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "SSD.hpp"
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#include <sys/stat.h>
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#include "../Encodings/MFM.hpp"
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using namespace Storage::Disk;
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SSD::SSD(const char *file_name) :
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Storage::FileHolder(file_name)
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{
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// very loose validation: the file needs to be a multiple of 256 bytes
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// and not ungainly large
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if(file_stats_.st_size & 255) throw ErrorNotSSD;
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if(file_stats_.st_size < 512) throw ErrorNotSSD;
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if(file_stats_.st_size > 800*256) throw ErrorNotSSD;
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// this has two heads if the suffix is .dsd, one if it's .ssd
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head_count_ = (tolower(file_name[strlen(file_name) - 3]) == 'd') ? 2 : 1;
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track_count_ = (unsigned int)(file_stats_.st_size / (256 * 10));
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if(track_count_ < 40) track_count_ = 40;
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else if(track_count_ < 80) track_count_ = 80;
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}
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unsigned int SSD::get_head_position_count()
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{
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return track_count_;
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}
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unsigned int SSD::get_head_count()
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{
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return head_count_;
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}
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bool SSD::get_is_read_only()
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{
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return false;
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}
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std::shared_ptr<Track> SSD::get_uncached_track_at_position(unsigned int head, unsigned int position)
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{
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std::shared_ptr<Track> track;
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if(head >= head_count_) return track;
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long file_offset = (position * head_count_ + head) * 256 * 10;
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fseek(file_, file_offset, SEEK_SET);
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std::vector<Storage::Encodings::MFM::Sector> sectors;
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for(int sector = 0; sector < 10; sector++)
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{
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Storage::Encodings::MFM::Sector new_sector;
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new_sector.track = (uint8_t)position;
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new_sector.side = 0;
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new_sector.sector = (uint8_t)sector;
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new_sector.data.resize(256);
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fread(&new_sector.data[0], 1, 256, file_);
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if(feof(file_))
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break;
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sectors.push_back(std::move(new_sector));
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}
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if(sectors.size()) return Storage::Encodings::MFM::GetFMTrackWithSectors(sectors);
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return track;
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}
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