mirror of
https://github.com/davidgiven/fluxengine.git
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111 lines
2.9 KiB
C++
111 lines
2.9 KiB
C++
#include "lib/core/globals.h"
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#include "lib/fluxmap.h"
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#include "lib/decoders/fluxmapreader.h"
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#include "protocol.h"
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#include "lib/decoders/decoders.h"
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#include "lib/sector.h"
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#include "f85.h"
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#include "lib/core/crc.h"
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#include "lib/core/bytes.h"
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#include "fmt/format.h"
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#include <string.h>
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#include <algorithm>
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const FluxPattern SECTOR_RECORD_PATTERN(24, F85_SECTOR_RECORD);
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const FluxPattern DATA_RECORD_PATTERN(24, F85_DATA_RECORD);
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const FluxMatchers ANY_RECORD_PATTERN(
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{&SECTOR_RECORD_PATTERN, &DATA_RECORD_PATTERN});
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static int decode_data_gcr(uint8_t gcr)
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{
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switch (gcr)
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{
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#define GCR_ENTRY(gcr, data) \
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case gcr: \
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return data;
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#include "data_gcr.h"
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#undef GCR_ENTRY
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}
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return -1;
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}
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static Bytes decode(const std::vector<bool>& bits)
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{
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Bytes output;
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ByteWriter bw(output);
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BitWriter bitw(bw);
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auto ii = bits.begin();
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while (ii != bits.end())
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{
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uint8_t inputfifo = 0;
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for (size_t i = 0; i < 5; i++)
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{
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if (ii == bits.end())
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break;
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inputfifo = (inputfifo << 1) | *ii++;
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}
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bitw.push(decode_data_gcr(inputfifo), 4);
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}
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bitw.flush();
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return output;
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}
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class DurangoF85Decoder : public Decoder
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{
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public:
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DurangoF85Decoder(const DecoderProto& config): Decoder(config) {}
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nanoseconds_t advanceToNextRecord() override
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{
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return seekToPattern(ANY_RECORD_PATTERN);
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}
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void decodeSectorRecord() override
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{
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/* Skip sync bits and ID byte. */
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if (readRaw24() != F85_SECTOR_RECORD)
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return;
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/* Read header. */
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const auto& bytes = decode(readRawBits(6 * 10));
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_sector->logicalSector = bytes[2];
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_sector->logicalSide = 0;
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_sector->logicalTrack = bytes[0];
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uint16_t wantChecksum = bytes.reader().seek(4).read_be16();
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uint16_t gotChecksum = crc16(CCITT_POLY, 0xef21, bytes.slice(0, 4));
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if (wantChecksum == gotChecksum)
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_sector->status =
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Sector::DATA_MISSING; /* unintuitive but correct */
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}
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void decodeDataRecord() override
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{
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/* Skip sync bits ID byte. */
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if (readRaw24() != F85_DATA_RECORD)
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return;
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const auto& bytes = decode(readRawBits((F85_SECTOR_LENGTH + 3) * 10))
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.slice(0, F85_SECTOR_LENGTH + 3);
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ByteReader br(bytes);
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_sector->data = br.read(F85_SECTOR_LENGTH);
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uint16_t wantChecksum = br.read_be16();
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uint16_t gotChecksum = crc16(CCITT_POLY, 0xbf84, _sector->data);
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_sector->status =
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(wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
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}
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};
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std::unique_ptr<Decoder> createDurangoF85Decoder(const DecoderProto& config)
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{
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return std::unique_ptr<Decoder>(new DurangoF85Decoder(config));
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}
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