Function decodeUpto3

src/simplicity/bitstream.c:83–89

Decode an encoded number between 1 and 3 inclusive. * When successful returns the decoded result. * If the decoded value would be too large, 'SIMPLICITY_ERR_DATA_OUT_OF_RANGE' is returned. * If more bits are needed than available in the 'stream', 'SIMPLICITY_ERR_BITSTRING_EOF' is returned. * If an I/O error occurs when reading from the 'stream', 'SIMPLICITY_ERR_BISTRING_ERROR' is returned. *

 * Precondition: NULL != stream
 */
static int32_t decodeUpto3(bitstream* stream) {
  int32_t result;
  int32_t len = decodeUpto1Bit(&result, stream);
  if (len < 0) return len;
  result |= 1 << len;
  return result;
}

/* Decode an encoded bitstring up to length 3.
 * If successful returns the length of the bitstring and 'result' contains the decoded bits.