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Improved logic for detecting when all sense has been derived from a track to spot any repeated track, not necessarily the first one. That avoids sectors that run over the index hold and obscure the first throwing things.

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This commit is contained in:
Thomas Harte 2017-08-17 15:31:53 -04:00
parent 733ee5a5c3
commit 4f8b89772e
1 changed files with 11 additions and 2 deletions
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13
Storage/Disk/Encodings/MFM.cpp
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@ -11,6 +11,8 @@
#include "../PCMTrack.hpp"
#include "../../../NumberTheory/CRC.hpp"
#include <set>
using namespace Storage::Encodings::MFM;
class MFMEncoder: public Encoder {
@ -274,13 +276,20 @@ std::shared_ptr<Sector> Parser::get_sector(uint8_t head, uint8_t track, uint8_t
seek_to_track(track);
int track_index = get_index(head, track, 0);
// Populate the sector cache if it's not already populated.
// Populate the sector cache if it's not already populated by asking for sectors unless and until
// one is returned that has already been seen.
if(decoded_tracks_.find(track_index) == decoded_tracks_.end()) {
std::shared_ptr<Sector> first_sector = get_next_sector();
std::set<uint8_t> visited_sectors;
if(first_sector) {
while(1) {
std::shared_ptr<Sector> next_sector = get_next_sector();
if(!next_sector || next_sector->sector == first_sector->sector) break;
if(next_sector) {
if(visited_sectors.find(next_sector->sector) != visited_sectors.end()) {
break;
}
visited_sectors.insert(next_sector->sector);
}
}
}
decoded_tracks_.insert(track_index);