mirror of https://gerrit.osmocom.org/libosmocore
119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/*! \file bits.h
|
|
* Osmocom bit level support code.
|
|
*
|
|
* NOTE on the endianess of pbit_t:
|
|
* Bits in a pbit_t are ordered MSB first, i.e. 0x80 is the first bit.
|
|
* Bit i in a pbit_t array is array[i/8] & (1<<(7-i%8))
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <stdint.h>
|
|
#include <stddef.h>
|
|
|
|
#include <osmocom/core/bit16gen.h>
|
|
#include <osmocom/core/bit32gen.h>
|
|
#include <osmocom/core/bit64gen.h>
|
|
|
|
/*! \defgroup bits soft, unpacked and packed bits
|
|
* @{
|
|
* \file bits.h */
|
|
|
|
typedef int8_t sbit_t; /*!< soft bit (-127...127) */
|
|
typedef uint8_t ubit_t; /*!< unpacked bit (0 or 1) */
|
|
typedef uint8_t pbit_t; /*!< packed bis (8 bits in a byte) */
|
|
|
|
/*! determine how many bytes we would need for \a num_bits packed bits
|
|
* \param[in] num_bits Number of packed bits
|
|
* \returns number of bytes needed for \a num_bits packed bits
|
|
*/
|
|
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(byte) \
|
|
(byte & 0x80 ? '1' : '.'), \
|
|
(byte & 0x40 ? '1' : '.'), \
|
|
(byte & 0x20 ? '1' : '.'), \
|
|
(byte & 0x10 ? '1' : '.'), \
|
|
(byte & 0x08 ? '1' : '.'), \
|
|
(byte & 0x04 ? '1' : '.'), \
|
|
(byte & 0x02 ? '1' : '.'), \
|
|
(byte & 0x01 ? '1' : '.')
|
|
|
|
/* BIT REVERSAL */
|
|
|
|
/*! bit-reversal mode for osmo_bit_reversal() */
|
|
enum osmo_br_mode {
|
|
/*! reverse all bits in a 32bit dword */
|
|
OSMO_BR_BITS_IN_DWORD = 31,
|
|
/*! reverse byte order in a 32bit dword */
|
|
OSMO_BR_BYTES_IN_DWORD = 24,
|
|
/*! reverse bits of each byte in a 32bit dword */
|
|
OSMO_BR_BITS_IN_BYTE = 7,
|
|
/*! swap the two 16bit words in a 32bit dword */
|
|
OSMO_BR_WORD_SWAP = 16,
|
|
};
|
|
|
|
/*! generic bit reversal function */
|
|
uint32_t osmo_bit_reversal(uint32_t x, enum osmo_br_mode k);
|
|
|
|
/* reverse the bits within each byte of a 32bit word */
|
|
uint32_t osmo_revbytebits_32(uint32_t x);
|
|
|
|
/* reverse the bits within a byte */
|
|
uint32_t osmo_revbytebits_8(uint8_t x);
|
|
|
|
/* reverse the bits of each byte in a given buffer */
|
|
void osmo_revbytebits_buf(uint8_t *buf, int len);
|
|
|
|
/*! left circular shift
|
|
* \param[in] in The 16 bit unsigned integer to be rotated
|
|
* \param[in] shift Number of bits to shift \a in to, [0;16] bits
|
|
* \returns shifted value
|
|
*/
|
|
static inline uint16_t osmo_rol16(uint16_t in, unsigned shift)
|
|
{
|
|
return (in << shift) | (in >> (16 - shift));
|
|
}
|
|
|
|
/*! @} */
|