mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-26 23:52:26 +00:00
50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
//
|
|
// SSD.cpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 18/09/2016.
|
|
// Copyright © 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#include "SSD.hpp"
|
|
|
|
#include <cstring>
|
|
|
|
#include "Utility/ImplicitSectors.hpp"
|
|
|
|
namespace {
|
|
static const int sectors_per_track = 10;
|
|
static const int sector_size = 1;
|
|
}
|
|
|
|
using namespace Storage::Disk;
|
|
|
|
SSD::SSD(const char *file_name) : MFMSectorDump(file_name) {
|
|
// very loose validation: the file needs to be a multiple of 256 bytes
|
|
// and not ungainly large
|
|
|
|
if(file_.stats().st_size & 255) throw ErrorNotSSD;
|
|
if(file_.stats().st_size < 512) throw ErrorNotSSD;
|
|
if(file_.stats().st_size > 800*256) throw ErrorNotSSD;
|
|
|
|
// this has two heads if the suffix is .dsd, one if it's .ssd
|
|
head_count_ = (tolower(file_name[std::strlen(file_name) - 3]) == 'd') ? 2 : 1;
|
|
track_count_ = static_cast<int>(file_.stats().st_size / (256 * 10));
|
|
if(track_count_ < 40) track_count_ = 40;
|
|
else if(track_count_ < 80) track_count_ = 80;
|
|
|
|
set_geometry(sectors_per_track, sector_size, false);
|
|
}
|
|
|
|
int SSD::get_head_position_count() {
|
|
return track_count_;
|
|
}
|
|
|
|
int SSD::get_head_count() {
|
|
return head_count_;
|
|
}
|
|
|
|
long SSD::get_file_offset_for_position(Track::Address address) {
|
|
return (address.position * head_count_ + address.head) * 256 * 10;
|
|
}
|