| 41 | static const FluxMatchers ALL_PATTERNS = {&SECTOR_PATTERN, &DATA_PATTERN}; |
| 42 | |
| 43 | class AgatDecoder : public Decoder |
| 44 | { |
| 45 | public: |
| 46 | AgatDecoder(const DecoderProto& config): Decoder(config) {} |
| 47 | |
| 48 | nanoseconds_t advanceToNextRecord() override |
| 49 | { |
| 50 | return seekToPattern(ALL_PATTERNS); |
| 51 | } |
| 52 | |
| 53 | void decodeSectorRecord() override |
| 54 | { |
| 55 | if (readRaw64() != SECTOR_ID) |
| 56 | return; |
| 57 | |
| 58 | auto bytes = decodeFmMfm(readRawBits(64)).slice(0, 4); |
| 59 | if (bytes[3] != 0x5a) |
| 60 | return; |
| 61 | |
| 62 | _sector->logicalCylinder = bytes[1] >> 1; |
| 63 | _sector->logicalSector = bytes[2]; |
| 64 | _sector->logicalHead = bytes[1] & 1; |
| 65 | _sector->status = Sector::DATA_MISSING; /* unintuitive but correct */ |
| 66 | } |
| 67 | |
| 68 | void decodeDataRecord() override |
| 69 | { |
| 70 | if (readRaw64() != DATA_ID) |
| 71 | return; |
| 72 | |
| 73 | Bytes bytes = decodeFmMfm(readRawBits((AGAT_SECTOR_SIZE + 2) * 16)) |
| 74 | .slice(0, AGAT_SECTOR_SIZE + 2); |
| 75 | |
| 76 | if (bytes[AGAT_SECTOR_SIZE + 1] != 0x5a) |
| 77 | return; |
| 78 | |
| 79 | _sector->data = bytes.slice(0, AGAT_SECTOR_SIZE); |
| 80 | uint8_t wantChecksum = bytes[AGAT_SECTOR_SIZE]; |
| 81 | uint8_t gotChecksum = agatChecksum(_sector->data); |
| 82 | _sector->status = |
| 83 | (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM; |
| 84 | } |
| 85 | }; |
| 86 | |
| 87 | std::unique_ptr<Decoder> createAgatDecoder(const DecoderProto& config) |
| 88 | { |
nothing calls this directly
no outgoing calls
no test coverage detected