salfter/fluxengine
1
0
Fork 0
mirror of https://github.com/davidgiven/fluxengine.git synced 2025-10-31 11:17:01 -07:00
Code Issues Packages Projects Releases Wiki Activity

Do the basic skeleton of the writer.

Browse Source
This commit is contained in:
David Given
2021-01-04 01:49:15 +01:00
parent c61376d5a1
commit a8a8ce4a36
1 changed files with 51 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
arch/macintosh/encoder.cc
View File

@@ -11,12 +11,62 @@
FlagGroup macintoshEncoderFlags;
static DoubleFlag postIndexGapUs(
{ "--post-index-gap-us" },
"Post-index gap before first sector header (microseconds).",
500);
static bool lastBit;
static double clockRateUsForTrack(unsigned track)
{
if (track < 16)
return 2.65;
if (track < 32)
return 2.90;
if (track < 48)
return 3.20;
return 4.00;
}
static unsigned sectorsForTrack(unsigned track)
{
if (track < 16)
return 12;
if (track < 32)
return 11;
if (track < 48)
return 10;
return 9;
}
std::unique_ptr<Fluxmap> MacintoshEncoder::encode(
int physicalTrack, int physicalSide, const SectorSet& allSectors)
{
if ((physicalTrack < 0) || (physicalTrack >= MAC_TRACKS_PER_DISK))
return std::unique_ptr<Fluxmap>();
return std::unique_ptr<Fluxmap>();
double clockRateUs = clockRateUsForTrack(physicalTrack);
int bitsPerRevolution = 200000.0 / clockRateUs;
std::vector<bool> bits(bitsPerRevolution);
unsigned cursor = 0;
fillBitmapTo(bits, cursor, postIndexGapUs / clockRateUs, { true, false });
lastBit = false;
unsigned numSectors = sectorsForTrack(physicalTrack);
for (int sectorId=0; sectorId<numSectors; sectorId++)
{
const auto& sectorData = allSectors.get(physicalTrack, physicalSide, sectorId);
//write_sector(bits, cursor, sectorData);
}
if (cursor >= bits.size())
Error() << "track data overrun";
fillBitmapTo(bits, cursor, bits.size(), { true, false });
std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
fluxmap->appendBits(bits, clockRateUs*1e3);
return fluxmap;
}