bit_operations.c File Reference

#include <inttypes.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <assert.h>
#include <memory.h>
#include "spandsp/telephony.h"
#include "spandsp/bit_operations.h"

Functions
uint16_t	bit_reverse16 (uint16_t x)
	Bit reverse a 16 bit word.
uint32_t	bit_reverse32 (uint32_t x)
	Bit reverse a 32 bit word.
uint32_t	bit_reverse_4bytes (uint32_t x)
	Bit reverse each of the four bytes in a 32 bit word.
void	bit_reverse (uint8_t to[], const uint8_t from[], int len)
	Bit reverse each bytes in a buffer.
int	one_bits32 (uint32_t x)
	Find the number of set bits in a 32 bit word.
uint32_t	make_mask32 (uint32_t x)
	Create a mask as wide as the number in a 32 bit word.
uint16_t	make_mask16 (uint16_t x)
	Create a mask as wide as the number in a 16 bit word.

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Detailed Description

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Function Documentation

void bit_reverse	(	uint8_t	to[],
		const uint8_t	from[],
		int	len
	)

Bit reverse each bytes in a buffer.

Parameters:

	to	The buffer to place the reversed data in.
	from	The buffer containing the data to be reversed.
	len	The length of the data in the buffer.

uint16_t bit_reverse16

(

uint16_t

data

)

Bit reverse a 16 bit word.

Parameters:

data

The word to be reversed.

Returns:

The bit reversed version of data.

uint32_t bit_reverse32

(

uint32_t

data

)

Bit reverse a 32 bit word.

Parameters:

data

The word to be reversed.

Returns:

The bit reversed version of data.

uint32_t bit_reverse_4bytes

(

uint32_t

data

)

Bit reverse each of the four bytes in a 32 bit word.

Parameters:

data

The word to be reversed.

Returns:

The bit reversed version of data.

uint16_t make_mask16

(

uint16_t

x

)

Create a mask as wide as the number in a 16 bit word.

Parameters:

x

The word to be searched.

Returns:

The mask.

uint32_t make_mask32

(

uint32_t

x

)

Create a mask as wide as the number in a 32 bit word.

Parameters:

x

The word to be searched.

Returns:

The mask.

int one_bits32

(

uint32_t

x

)

Find the number of set bits in a 32 bit word.

Parameters:

x

The word to be searched.

Returns:

The number of set bits.