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Discover that Macintosh side byte encoding is weirder than I thought. Now at

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least all the sectors are on the same side of the disk.
This commit is contained in:
David Given
2019-02-20 23:03:52 +01:00
parent f6ba279f7e
commit c4ac231a50
1 changed files with 10 additions and 1 deletions
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11
lib/macintosh/decoder.cc
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@@ -96,6 +96,15 @@ static std::vector<uint8_t> decode_crazy_data(const uint8_t* inp, int& status)
return output;
}
uint8_t decode_side(uint8_t side)
{
/* Mac disks, being weird, use the side byte to encode both the side (in
* bit 5) and also whether we're above track 0x3f (in bit 6).
*/
return !!(side & 0x40);
}
SectorVector MacintoshDecoder::decodeToSectors(
const RawRecordVector& rawRecords, unsigned physicalTrack)
{
@@ -150,7 +159,7 @@ SectorVector MacintoshDecoder::decodeToSectors(
auto data = decode_crazy_data(inputbuffer, status);
auto sector = std::unique_ptr<Sector>(
new Sector(status, physicalTrack, nextSide, nextSector, data));
new Sector(status, physicalTrack, decode_side(nextSide), nextSector, data));
sectors.push_back(std::move(sector));
break;
}