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typedef struct v27scrambler {
int descramble; /* set if we descramble */
uint16_t shift; /* shift register to hold 13 bits */
int counter; /* counter to guard against repetitions */
uint16_t resetmask; /* bit mask for repition check */
} v27scrambler_t;
void v27_scrambler_init(v27scrambler_t *scram, int bis, int descramble);
uint8_t v27_scrambler_bit(v27scrambler_t *scram, uint8_t in);
void v27_scrambler_block(v27scrambler_t *scram, uint8_t *data, int len);
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