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64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
//
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// OricMFMDSK.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 21/11/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "OricMFMDSK.hpp"
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#include "../PCMTrack.hpp"
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using namespace Storage::Disk;
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OricMFMDSK::OricMFMDSK(const char *file_name) :
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Storage::FileHolder(file_name)
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{
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if(!check_signature("MFM_DISK", 8))
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throw ErrorNotOricMFMDSK;
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head_count_ = fgetc32le();
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track_count_ = fgetc32le();
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geometry_type_ = fgetc32le();
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if(geometry_type_ < 1 || geometry_type_ > 2)
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throw ErrorNotOricMFMDSK;
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}
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unsigned int OricMFMDSK::get_head_position_count()
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{
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return track_count_;
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}
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unsigned int OricMFMDSK::get_head_count()
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{
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return head_count_;
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}
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std::shared_ptr<Track> OricMFMDSK::get_track_at_position(unsigned int head, unsigned int position)
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{
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long offset = 0;
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switch(geometry_type_)
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{
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case 1:
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offset = (head * track_count_) + position;
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break;
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case 2:
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offset = (position * track_count_ * head_count_) + head;
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break;
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}
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fseek(file_, (offset * 6400) + 256, SEEK_SET);
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// TODO: upon review, the file format actually seems to omit clock bits. So it's not an MFM capture.
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// A consumer must contextually guess when an FB, FC, etc is meant to be a control mark. So turfing
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// the data over directly as below isn't correct.
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PCMSegment segment;
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segment.number_of_bits = 6250*8;
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segment.data.resize(6250);
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fread(segment.data.data(), 1, 6250, file_);
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std::shared_ptr<PCMTrack> track(new PCMTrack(segment));
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return track;
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}
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