mirror of
https://github.com/davidgiven/fluxengine.git
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d25f96dd24
is formatted... but has trouble reading sectors above about 1000. Also remember that encoding MFM needs to keep one bit of state at all times.
130 lines
3.5 KiB
C++
130 lines
3.5 KiB
C++
#include "globals.h"
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#include "record.h"
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#include "decoders/decoders.h"
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#include "encoders/encoders.h"
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#include "amiga.h"
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#include "crc.h"
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#include "sectorset.h"
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#include "writer.h"
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FlagGroup amigaEncoderFlags;
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static DoubleFlag clockRateUs(
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{ "--clock-rate" },
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"Encoded data clock rate (microseconds).",
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2.00);
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static DoubleFlag postIndexGapMs(
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{ "--post-index-gap" },
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"Post-index gap before first sector header (milliseconds).",
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0.5);
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static bool lastBit;
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static int charToInt(char c)
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{
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if (isdigit(c))
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return c - '0';
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return 10 + tolower(c) - 'a';
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}
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static void write_bits(std::vector<bool>& bits, unsigned& cursor, const std::vector<bool>& src)
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{
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for (bool bit : src)
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{
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if (cursor < bits.size())
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bits[cursor++] = bit;
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}
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}
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static void write_bits(std::vector<bool>& bits, unsigned& cursor, uint64_t data, int width)
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{
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cursor += width;
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for (int i=0; i<width; i++)
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{
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unsigned pos = cursor - i - 1;
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if (pos < bits.size())
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bits[pos] = data & 1;
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data >>= 1;
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}
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}
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static void write_interleaved_bytes(std::vector<bool>& bits, unsigned& cursor, const Bytes& bytes)
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{
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assert(!(bytes.size() & 3));
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Bytes interleaved = amigaInterleave(bytes);
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encodeMfm(bits, cursor, interleaved, lastBit);
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}
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static void write_interleaved_bytes(std::vector<bool>& bits, unsigned& cursor, uint32_t data)
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{
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Bytes b(4);
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ByteWriter bw(b);
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bw.write_be32(data);
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write_interleaved_bytes(bits, cursor, b);
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}
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static void write_sector(std::vector<bool>& bits, unsigned& cursor, const Sector* sector)
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{
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if ((sector->data.size() != 512) && (sector->data.size() != 528))
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Error() << "unsupported sector size --- you must pick 512 or 528";
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write_bits(bits, cursor, AMIGA_SECTOR_RECORD, 6*8);
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std::vector<bool> headerBits(20*16);
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unsigned headerCursor = 0;
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Bytes header =
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{
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0xff, /* Amiga 1.0 format byte */
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(uint8_t) ((sector->logicalTrack<<1) | sector->logicalSide),
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(uint8_t) sector->logicalSector,
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(uint8_t) (AMIGA_SECTORS_PER_TRACK - sector->logicalSector)
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};
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write_interleaved_bytes(headerBits, headerCursor, header);
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Bytes recoveryInfo(16);
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if (sector->data.size() == 528)
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recoveryInfo = sector->data.slice(512, 16);
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write_interleaved_bytes(headerBits, headerCursor, recoveryInfo);
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std::vector<bool> dataBits(512*16);
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unsigned dataCursor = 0;
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write_interleaved_bytes(dataBits, dataCursor, sector->data);
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write_bits(bits, cursor, headerBits);
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uint32_t headerChecksum = amigaChecksum(toBytes(headerBits));
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write_interleaved_bytes(bits, cursor, headerChecksum);
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uint32_t dataChecksum = amigaChecksum(toBytes(dataBits));
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write_interleaved_bytes(bits, cursor, dataChecksum);
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write_bits(bits, cursor, dataBits);
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}
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std::unique_ptr<Fluxmap> AmigaEncoder::encode(
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int physicalTrack, int physicalSide, const SectorSet& allSectors)
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{
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if ((physicalTrack < 0) || (physicalTrack >= AMIGA_TRACKS_PER_DISK))
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return std::unique_ptr<Fluxmap>();
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int bitsPerRevolution = 200000.0 / clockRateUs;
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std::vector<bool> bits(bitsPerRevolution);
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unsigned cursor = 0;
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fillBitmapTo(bits, cursor, postIndexGapMs * 1000 / clockRateUs, { true, false });
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lastBit = false;
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for (int sectorId=0; sectorId<AMIGA_SECTORS_PER_TRACK; sectorId++)
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{
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const auto& sectorData = allSectors.get(physicalTrack, physicalSide, sectorId);
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write_sector(bits, cursor, sectorData);
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}
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if (cursor >= bits.size())
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Error() << "track data overrun";
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fillBitmapTo(bits, cursor, bits.size(), { true, false });
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std::unique_ptr<Fluxmap> fluxmap(new Fluxmap);
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fluxmap->appendBits(bits, clockRateUs*1e3);
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return fluxmap;
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}
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