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Merge pull request #434 from TomHarte/RelaxedParsing

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Removes requirement for correct sector epilogues.
This commit is contained in:
Thomas Harte 2018-05-12 23:39:22 -04:00 committed by GitHub
commit 8b23a08fc4
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1 changed files with 41 additions and 48 deletions
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17
Storage/Disk/Encodings/AppleGCR/SegmentParser.cpp
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@ -85,18 +85,15 @@ std::map<std::size_t, Sector> Storage::Encodings::AppleGCR::sectors_from_segment
}
} else {
if(new_sector) {
// If this is an epilogue, make sense of this whole sector;
// otherwise just keep the byte for later.
if(scanner[1] == epilogue[0] && scanner[2] == epilogue[1]) {
new_sector->data.push_back(value);
// If this is potentially a complete sector, check it out.
if(new_sector->data.size() == 343) {
// TODO: allow for 13-sector form.
std::unique_ptr<Sector> sector = std::move(new_sector);
new_sector.reset();
pointer = scanning_sentinel;
// Check for an expected size; the first byte of the epilogue has been stored, so
// these numbers are one bigger than usual.
if(sector->data.size() != 412 && sector->data.size() != 344) continue;
sector->data.resize(sector->data.size() - 1);
// Check for apparent four and four encoding.
uint_fast8_t header_mask = 0xff;
for(auto c : header) header_mask &= c;
@ -111,7 +108,6 @@ std::map<std::size_t, Sector> Storage::Encodings::AppleGCR::sectors_from_segment
uint_fast8_t checksum = ((header[6] << 1) | 1) & header[7];
if(checksum != (sector->address.volume^sector->address.track^sector->address.sector)) continue;
if(sector->data.size() == 343) {
// Unmap the sector contents as 6 and 2 data.
bool out_of_bounds = false;
for(auto &c : sector->data) {
@ -150,15 +146,12 @@ std::map<std::size_t, Sector> Storage::Encodings::AppleGCR::sectors_from_segment
unmap(171, 85, 2);
#undef unmap
}
// Throw away the collection of two-bit chunks.
sector->data.erase(sector->data.begin(), sector->data.end() - 256);
// Add this sector to the map.
result.insert(std::make_pair(sector_location, std::move(*sector)));
} else {
new_sector->data.push_back(value);
}
} else {
// Just capture the header in place; it'll be decoded