Functions for building 64bit masks in gnuradio/math.h

gistfile1.txt

#include <stdint.h>

  /*!
   * \param len length of the mask in bits up to 64.
   * \returns A 64-bit mask aligned on the byte's MSB.
   */
  static inline uint64_t
  create_64bit_msb_mask(unsigned len)
  {
    return ((~0ULL) >> (64 - len)) << (64 - len);
  }

  /*!
   * \param len length of the mask in bits up to 64.
   * \returns A 64-bit mask aligned on the byte's LSB.
   */
  static inline uint64_t
  create_64bit_lsb_mask(unsigned len)
  {
    return ((~0ULL) >> (64 - len));
  }