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Fix CRC checking for IBM (both FM and MFM).

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David Given
2019-03-05 21:09:28 +01:00
parent 0ae1623afc
commit 3a931afa60
1 changed files with 3 additions and 3 deletions
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6
lib/ibm/decoder.cc
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@@ -50,14 +50,14 @@ SectorVector AbstractIbmDecoder::decodeToSectors(const RawRecordVector& rawRecor
unsigned size = 1 << (idam.sectorSize + 7);
data.resize(IBM_DAM_LEN + size + 2);
const Bytes payload = data.slice(IBM_DAM_LEN, size);
uint16_t gotCrc = crc16(CCITT_POLY, payload);
uint16_t gotCrc = crc16(CCITT_POLY, bytes.slice(0, IBM_DAM_LEN+size+headerSize));
uint16_t wantedCrc = data.reader().seek(IBM_DAM_LEN+size).read_be16();
int status = (gotCrc == wantedCrc) ? Sector::OK : Sector::BAD_CHECKSUM;
int sectorNum = idam.sector - _sectorIdBase;
auto sector = std::unique_ptr<Sector>(
new Sector(status, idam.cylinder, idam.side, sectorNum, payload));
new Sector(status, idam.cylinder, idam.side, sectorNum,
data.slice(IBM_DAM_LEN, size)));
sectors.push_back(std::move(sector));
idamValid = false;
break;