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Ensures initialisation of scanner and that sectors overlapping the end of track are captured.

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This commit is contained in:
Thomas Harte 2018-05-12 18:42:07 -04:00
parent f410dcb3f3
commit 49592ebaf3
1 changed files with 8 additions and 4 deletions
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12
Storage/Disk/Encodings/AppleGCR/SegmentParser.cpp
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@ -45,11 +45,15 @@ std::map<std::size_t, Sector> Storage::Encodings::AppleGCR::sectors_from_segment
std::size_t sector_location = 0;
std::size_t pointer = scanning_sentinel;
std::array<uint_fast8_t, 8> header{{0, 0, 0, 0, 0, 0, 0, 0}};
std::array<uint_fast8_t, 3> scanner;
std::array<uint_fast8_t, 3> scanner{{0, 0, 0}};
// Scan the track 1 and 1/8th times; that's long enough to make sure that any sector which straddles the
// end of the track is caught. Since they're put into a map, it doesn't matter if they're caught twice.
unsigned int extended_length = segment.number_of_bits + (segment.number_of_bits >> 3);
for(unsigned int bit = 0; bit < extended_length; ++bit) {
shift_register = static_cast<uint_fast8_t>((shift_register << 1) | segment.bit(bit % segment.number_of_bits));
for(unsigned int bit = 0; bit < segment.number_of_bits; ++bit) {
// Apple GCR parsing: bytes always have the top bit set.
shift_register = static_cast<uint_fast8_t>((shift_register << 1) | segment.bit(bit));
if(!(shift_register&0x80)) continue;
// Grab the byte.
@ -76,7 +80,7 @@ std::map<std::size_t, Sector> Storage::Encodings::AppleGCR::sectors_from_segment
new_sector.reset(new Sector);
new_sector->data.reserve(412);
} else {
sector_location = static_cast<std::size_t>(bit);
sector_location = static_cast<std::size_t>(bit % segment.number_of_bits);
}
}
} else {