bits.h

Go to the documentation of this file.

 
#pragma once
 
#include <stdint.h>
#include <stddef.h>
 
#include <osmocom/core/bit16gen.h>
#include <osmocom/core/bit32gen.h>
#include <osmocom/core/bit64gen.h>
 
typedef int8_t  sbit_t;
 
typedef uint8_t ubit_t;
 
typedef uint8_t pbit_t;
 
static inline unsigned int osmo_pbit_bytesize(unsigned int num_bits)
{
        unsigned int pbit_bytesize = num_bits / 8;
 
        if (num_bits % 8)
                pbit_bytesize++;
 
        return pbit_bytesize;
}
 
int osmo_ubit2pbit(pbit_t *out, const ubit_t *in, unsigned int num_bits);
 
int osmo_pbit2ubit(ubit_t *out, const pbit_t *in, unsigned int num_bits);
 
void osmo_nibble_shift_right(uint8_t *out, const uint8_t *in,
                             unsigned int num_nibbles);
void osmo_nibble_shift_left_unal(uint8_t *out, const uint8_t *in,
                                 unsigned int num_nibbles);
 
void osmo_ubit2sbit(sbit_t *out, const ubit_t *in, unsigned int num_bits);
void osmo_sbit2ubit(ubit_t *out, const sbit_t *in, unsigned int num_bits);
 
int osmo_ubit2pbit_ext(pbit_t *out, unsigned int out_ofs,
                       const ubit_t *in, unsigned int in_ofs,
                       unsigned int num_bits, int lsb_mode);
 
int osmo_pbit2ubit_ext(ubit_t *out, unsigned int out_ofs,
                       const pbit_t *in, unsigned int in_ofs,
                       unsigned int num_bits, int lsb_mode);
 
#define OSMO_BIN_SPEC "%d%d%d%d%d%d%d%d"
#define OSMO_BIN_PRINT(byte)  \
  (byte & 0x80 ? 1 : 0), \
  (byte & 0x40 ? 1 : 0), \
  (byte & 0x20 ? 1 : 0), \
  (byte & 0x10 ? 1 : 0), \
  (byte & 0x08 ? 1 : 0), \
  (byte & 0x04 ? 1 : 0), \
  (byte & 0x02 ? 1 : 0), \
  (byte & 0x01 ? 1 : 0)
 
#define OSMO_BIT_SPEC "%c%c%c%c%c%c%c%c"
#define OSMO_BIT_PRINT_EX(byte, ch)             \
  (byte & 0x80 ? ch : '.'), \
  (byte & 0x40 ? ch : '.'), \
  (byte & 0x20 ? ch : '.'), \
  (byte & 0x10 ? ch : '.'), \
  (byte & 0x08 ? ch : '.'), \
  (byte & 0x04 ? ch : '.'), \
  (byte & 0x02 ? ch : '.'), \
  (byte & 0x01 ? ch : '.')
 
#define OSMO_BIT_PRINT(byte)  OSMO_BIT_PRINT_EX(byte, '1')
 
/* BIT REVERSAL */
 
enum osmo_br_mode {
        OSMO_BR_BITS_IN_DWORD   = 31,
        OSMO_BR_BYTES_IN_DWORD  = 24,
        OSMO_BR_BITS_IN_BYTE    = 7,
        OSMO_BR_WORD_SWAP       = 16,
};
 
uint32_t osmo_bit_reversal(uint32_t x, enum osmo_br_mode k);
 
uint32_t osmo_revbytebits_32(uint32_t x);
 
uint32_t osmo_revbytebits_8(uint8_t x);
 
void osmo_revbytebits_buf(uint8_t *buf, int len);
 
static inline uint16_t osmo_rol16(uint16_t in, unsigned shift)
{
        return (in << shift) | (in >> (16 - shift));
}