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MSX DSKs start with sector 1; Acorn disks still begin with sector 0. Also it turns out that MSX DSKs are indeed interleaved.
50 lines
1.2 KiB
C++
50 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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#include <cstring>
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#include "Utility/ImplicitSectors.hpp"
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namespace {
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static const int sectors_per_track = 10;
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static const int sector_size = 1;
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}
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using namespace Storage::Disk;
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SSD::SSD(const char *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 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[std::strlen(file_name) - 3]) == 'd') ? 2 : 1;
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track_count_ = static_cast<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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set_geometry(sectors_per_track, sector_size, 0, false);
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}
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int SSD::get_head_position_count() {
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return 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 * head_count_ + address.head) * 256 * 10;
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}
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