Function mzosChecksum

arch/micropolis/decoder.cc:49–62

Vector MZOS does not use the standard Micropolis checksum. * The checksum is initially 0. * For each data byte in the 256-byte payload, rotate left, * carrying bit 7 to bit 0. XOR with the current checksum. * * Unlike the Micropolis checksum, this does not cover the 12-byte * header (track, sector, 10 OS-specific bytes.) */

 * header (track, sector, 10 OS-specific bytes.)
 */
uint8_t mzosChecksum(const Bytes& bytes)
{
    ByteReader br(bytes);
    uint8_t checksum = 0;
    uint8_t databyte;

    while (!br.eof())
    {
        databyte = br.read_8();
        checksum ^= ((databyte << 1) | (databyte >> 7));
    }

    return checksum;
}

static uint8_t b(uint32_t field, uint8_t pos)
{