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Also as a drive-by fix, corrects accidental assumption of 10 sectors for all MFMSectorDump descendants.
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
//
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// AcornADF.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 25/09/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "AcornADF.hpp"
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#include "Utility/ImplicitSectors.hpp"
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namespace {
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static const int sectors_per_track = 16;
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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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AcornADF::AcornADF(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 % static_cast<off_t>(128 << sector_size)) throw Error::InvalidFormat;
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if(file_.stats().st_size < 7 * static_cast<off_t>(128 << sector_size)) throw Error::InvalidFormat;
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// check that the initial directory's 'Hugo's are present
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file_.seek(513, SEEK_SET);
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uint8_t bytes[4];
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file_.read(bytes, 4);
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if(bytes[0] != 'H' || bytes[1] != 'u' || bytes[2] != 'g' || bytes[3] != 'o') throw Error::InvalidFormat;
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file_.seek(0x6fb, SEEK_SET);
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file_.read(bytes, 4);
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if(bytes[0] != 'H' || bytes[1] != 'u' || bytes[2] != 'g' || bytes[3] != 'o') throw Error::InvalidFormat;
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set_geometry(sectors_per_track, sector_size, 0, true);
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}
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HeadPosition AcornADF::get_maximum_head_position() {
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return HeadPosition(80);
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}
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int AcornADF::get_head_count() {
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return 1;
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}
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long AcornADF::get_file_offset_for_position(Track::Address address) {
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return address.position.as_int() * (128 << sector_size) * sectors_per_track;
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}
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