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43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
//
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// ST.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 12/11/2019.
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// Copyright © 2019 Thomas Harte. All rights reserved.
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//
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#include "ST.hpp"
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namespace {
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constexpr int sectors_per_track = 10;
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constexpr int sector_size = 2;
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}
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using namespace Storage::Disk;
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ST::ST(const std::string &file_name) : MFMSectorDump(file_name) {
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// Very loose validation: the file needs to be a whole number of tracks,
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// and not more than 160 of them.
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const auto stats = file_.stats();
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if(stats.st_size % (512*10)) throw Error::InvalidFormat;
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if(stats.st_size > 512*10*160) throw Error::InvalidFormat;
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// Head count: 2 if there are more than 80 tracks. Otherwise 1.
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head_count_ = (stats.st_size >= 512 * 10 * 80) ? 2 : 1;
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track_count_ = std::max(80, int(stats.st_size / (512 * 10 * head_count_)));
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set_geometry(sectors_per_track, sector_size, 1, true);
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}
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HeadPosition ST::get_maximum_head_position() {
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return HeadPosition(track_count_);
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}
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int ST::get_head_count() {
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return head_count_;
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}
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long ST::get_file_offset_for_position(Track::Address address) {
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return (address.position.as_int() * head_count_ + address.head) * 512 * sectors_per_track;
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}
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