mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-03 08:05:40 +00:00
43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
//
|
|
// ST.cpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 12/11/2019.
|
|
// Copyright © 2019 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#include "ST.hpp"
|
|
|
|
namespace {
|
|
constexpr int sectors_per_track = 10;
|
|
constexpr int sector_size = 2;
|
|
}
|
|
|
|
using namespace Storage::Disk;
|
|
|
|
ST::ST(const std::string &file_name) : MFMSectorDump(file_name) {
|
|
// Very loose validation: the file needs to be a whole number of tracks,
|
|
// and not more than 160 of them.
|
|
const auto stats = file_.stats();
|
|
if(stats.st_size % (512*10)) throw Error::InvalidFormat;
|
|
if(stats.st_size > 512*10*160) throw Error::InvalidFormat;
|
|
|
|
// Head count: 2 if there are more than 80 tracks. Otherwise 1.
|
|
head_count_ = (stats.st_size >= 512 * 10 * 80) ? 2 : 1;
|
|
track_count_ = std::max(80, int(stats.st_size / (512 * 10 * head_count_)));
|
|
|
|
set_geometry(sectors_per_track, sector_size, 1, true);
|
|
}
|
|
|
|
HeadPosition ST::get_maximum_head_position() {
|
|
return HeadPosition(track_count_);
|
|
}
|
|
|
|
int ST::get_head_count() {
|
|
return head_count_;
|
|
}
|
|
|
|
long ST::get_file_offset_for_position(Track::Address address) {
|
|
return (address.position.as_int() * head_count_ + address.head) * 512 * sectors_per_track;
|
|
}
|