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46 lines
1.2 KiB
C++
46 lines
1.2 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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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 > 800*256) throw Error::InvalidFormat;
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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[file_name.size() - 3]) == 'd') ? 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, false);
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}
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HeadPosition SSD::get_maximum_head_position() {
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return HeadPosition(track_count_);
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}
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int SSD::get_head_count() {
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return head_count_;
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}
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long SSD::get_file_offset_for_position(Track::Address address) {
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return (address.position.as_int() * head_count_ + address.head) * 256 * 10;
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}
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