mirror of
https://github.com/davidgiven/fluxengine.git
synced 2025-10-24 11:11:02 -07:00
112 lines
2.9 KiB
C++
112 lines
2.9 KiB
C++
#include "lib/core/globals.h"
|
|
#include "lib/data/fluxmap.h"
|
|
#include "lib/data/fluxmapreader.h"
|
|
#include "lib/data/fluxpattern.h"
|
|
#include "protocol.h"
|
|
#include "lib/decoders/decoders.h"
|
|
#include "lib/data/sector.h"
|
|
#include "f85.h"
|
|
#include "lib/core/crc.h"
|
|
#include "lib/core/bytes.h"
|
|
#include "fmt/format.h"
|
|
#include <string.h>
|
|
#include <algorithm>
|
|
|
|
const FluxPattern SECTOR_RECORD_PATTERN(24, F85_SECTOR_RECORD);
|
|
const FluxPattern DATA_RECORD_PATTERN(24, F85_DATA_RECORD);
|
|
const FluxMatchers ANY_RECORD_PATTERN(
|
|
{&SECTOR_RECORD_PATTERN, &DATA_RECORD_PATTERN});
|
|
|
|
static int decode_data_gcr(uint8_t gcr)
|
|
{
|
|
switch (gcr)
|
|
{
|
|
#define GCR_ENTRY(gcr, data) \
|
|
case gcr: \
|
|
return data;
|
|
#include "data_gcr.h"
|
|
#undef GCR_ENTRY
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static Bytes decode(const std::vector<bool>& bits)
|
|
{
|
|
Bytes output;
|
|
ByteWriter bw(output);
|
|
BitWriter bitw(bw);
|
|
|
|
auto ii = bits.begin();
|
|
while (ii != bits.end())
|
|
{
|
|
uint8_t inputfifo = 0;
|
|
for (size_t i = 0; i < 5; i++)
|
|
{
|
|
if (ii == bits.end())
|
|
break;
|
|
inputfifo = (inputfifo << 1) | *ii++;
|
|
}
|
|
|
|
bitw.push(decode_data_gcr(inputfifo), 4);
|
|
}
|
|
bitw.flush();
|
|
|
|
return output;
|
|
}
|
|
|
|
class DurangoF85Decoder : public Decoder
|
|
{
|
|
public:
|
|
DurangoF85Decoder(const DecoderProto& config): Decoder(config) {}
|
|
|
|
nanoseconds_t advanceToNextRecord() override
|
|
{
|
|
return seekToPattern(ANY_RECORD_PATTERN);
|
|
}
|
|
|
|
void decodeSectorRecord() override
|
|
{
|
|
/* Skip sync bits and ID byte. */
|
|
|
|
if (readRaw24() != F85_SECTOR_RECORD)
|
|
return;
|
|
|
|
/* Read header. */
|
|
|
|
const auto& bytes = decode(readRawBits(6 * 10));
|
|
|
|
_sector->logicalSector = bytes[2];
|
|
_sector->logicalSide = 0;
|
|
_sector->logicalTrack = bytes[0];
|
|
|
|
uint16_t wantChecksum = bytes.reader().seek(4).read_be16();
|
|
uint16_t gotChecksum = crc16(CCITT_POLY, 0xef21, bytes.slice(0, 4));
|
|
if (wantChecksum == gotChecksum)
|
|
_sector->status =
|
|
Sector::DATA_MISSING; /* unintuitive but correct */
|
|
}
|
|
|
|
void decodeDataRecord() override
|
|
{
|
|
/* Skip sync bits ID byte. */
|
|
|
|
if (readRaw24() != F85_DATA_RECORD)
|
|
return;
|
|
|
|
const auto& bytes = decode(readRawBits((F85_SECTOR_LENGTH + 3) * 10))
|
|
.slice(0, F85_SECTOR_LENGTH + 3);
|
|
ByteReader br(bytes);
|
|
|
|
_sector->data = br.read(F85_SECTOR_LENGTH);
|
|
uint16_t wantChecksum = br.read_be16();
|
|
uint16_t gotChecksum = crc16(CCITT_POLY, 0xbf84, _sector->data);
|
|
_sector->status =
|
|
(wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
|
|
}
|
|
};
|
|
|
|
std::unique_ptr<Decoder> createDurangoF85Decoder(const DecoderProto& config)
|
|
{
|
|
return std::unique_ptr<Decoder>(new DurangoF85Decoder(config));
|
|
}
|