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50 lines
1.4 KiB
C++
50 lines
1.4 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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namespace {
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constexpr int sectors_per_track = 10;
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constexpr int sector_size = 1;
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}
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using namespace Storage::Disk;
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SSD::SSD(const std::string &file_name) : MFMSectorDump(file_name) {
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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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// Disk has two heads if the suffix is .dsd or if it's too large to be an SSD.
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const bool is_double_sided =
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(tolower(file_name[file_name.size() - 3]) == 'd') ||
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file_.stats().st_size > 80*10*256;
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if(file_.stats().st_size & 255) throw Error::InvalidFormat;
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if(file_.stats().st_size < 512) throw Error::InvalidFormat;
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if(file_.stats().st_size > 80*2*10*256) throw Error::InvalidFormat;
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head_count_ = is_double_sided ? 2 : 1;
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track_count_ = int(file_.stats().st_size / (256 * 10 * head_count_));
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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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set_geometry(sectors_per_track, sector_size, 0, Encodings::MFM::Density::Single);
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}
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HeadPosition SSD::maximum_head_position() const {
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return HeadPosition(track_count_);
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}
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int SSD::head_count() const {
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return head_count_;
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}
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long SSD::get_file_offset_for_position(const Track::Address address) const {
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return (address.position.as_int() * head_count_ + address.head) * 256 * 10;
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}
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