mirror of
https://github.com/davidgiven/fluxengine.git
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118 lines
2.8 KiB
C++
118 lines
2.8 KiB
C++
#include "globals.h"
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#include "fluxmap.h"
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#include "decoders/fluxmapreader.h"
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#include "protocol.h"
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#include "decoders/decoders.h"
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#include "sector.h"
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#include "victor9k.h"
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#include "crc.h"
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#include "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(32, VICTOR9K_SECTOR_RECORD);
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const FluxPattern DATA_RECORD_PATTERN(32, VICTOR9K_DATA_RECORD);
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const FluxMatchers ANY_RECORD_PATTERN({ &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: 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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uint8_t decoded = decode_data_gcr(inputfifo);
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bitw.push(decoded, 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 Victor9kDecoder : public AbstractDecoder
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{
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public:
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Victor9kDecoder(const DecoderProto& config):
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AbstractDecoder(config)
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{}
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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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/* Check the ID. */
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if (readRaw32() != VICTOR9K_SECTOR_RECORD)
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return;
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/* Read header. */
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auto bytes = decode(readRawBits(3*10)).slice(0, 3);
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uint8_t rawTrack = bytes[0];
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_sector->physicalSector = bytes[1];
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uint8_t gotChecksum = bytes[2];
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_sector->logicalTrack = rawTrack & 0x7f;
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_sector->logicalSide = rawTrack >> 7;
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uint8_t wantChecksum = bytes[0] + bytes[1];
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if ((_sector->physicalSector > 20) || (_sector->logicalTrack > 85) || (_sector->logicalSide > 1))
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return;
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if (wantChecksum == gotChecksum)
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_sector->status = 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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/* Check the ID. */
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if (readRaw32() != VICTOR9K_DATA_RECORD)
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return;
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/* Read data. */
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auto bytes = decode(readRawBits((VICTOR9K_SECTOR_LENGTH+4)*10))
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.slice(0, VICTOR9K_SECTOR_LENGTH+4);
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ByteReader br(bytes);
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_sector->data = br.read(VICTOR9K_SECTOR_LENGTH);
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uint16_t gotChecksum = sumBytes(_sector->data);
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uint16_t wantChecksum = br.read_le16();
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_sector->status = (gotChecksum == wantChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
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}
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};
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std::unique_ptr<AbstractDecoder> createVictor9kDecoder(const DecoderProto& config)
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{
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return std::unique_ptr<AbstractDecoder>(new Victor9kDecoder(config));
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}
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