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Micropolis raw 275 byte sectors

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These are used by formats like VGI since the ECC varied per machine and
the 10 extra bytes of user data may contain useful information.
This commit is contained in:
Eric Anderson
2021-10-02 22:59:14 -07:00
parent a00137d742
commit ce5fcaf172
5 changed files with 82 additions and 3 deletions
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8
arch/micropolis/encoder.cc
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@@ -19,7 +19,15 @@ static void write_sector(std::vector<bool>& bits, unsigned& cursor, const std::s
fullSector->push_back(0);
Bytes sectorData;
if (sector->data.size() == MICROPOLIS_ENCODED_SECTOR_SIZE)
{
if (sector->data[0] != 0xFF)
Error() << "275 byte sector doesn't start with sync byte 0xFF. Corrupted sector";
uint8_t wantChecksum = sector->data[1+2+266];
uint8_t gotChecksum = micropolisChecksum(sector->data.slice(1, 2+266));
if (wantChecksum != gotChecksum)
std::cerr << "Warning: checksum incorrect. Sector: " << sector->logicalSector << std::endl;
sectorData = sector->data;
}
else
{
ByteWriter writer(sectorData);