arith.c File Reference

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

Include dependency graph for arith.c:

Macros
#define	NUM_SYMBOLS   38
#define	CODE_BITS   32
#define	MAX_CODE   ((1ULL << CODE_BITS) - 1)
#define	HALF   (1ULL << (CODE_BITS - 1))
#define	QUARTER   (HALF >> 1)
#define	THREE_QUARTERS   (HALF + QUARTER)
#define	BUFFER_SIZE   4096
#define	MAX_ENCODE_BITS   (BUFFER_SIZE * 8)
#define	MAX_PENDING   1024

Functions
void	init_model ()
int	find_index (char c)
void	bw_init (BitWriter *bw, uint8_t *buf)
void	bw_write_bit (BitWriter *bw, int bit)
int	bw_bytes (BitWriter *bw)
void	br_init (BitReader *br, uint8_t *buf, int len)
int	br_read_bit (BitReader *br)
int	arithmetic_encode (const char *msg, uint8_t *output)
int	arithmetic_decode (uint8_t *input, int max_len, char *output, int max_output)

Variables
char	symbols [NUM_SYMBOLS]
uint64_t	cum_freq [NUM_SYMBOLS+1]

Macro Definition Documentation

BUFFER_SIZE

#define BUFFER_SIZE   4096

CODE_BITS

#define CODE_BITS   32

HALF

#define HALF   (1ULL << (CODE_BITS - 1))

MAX_CODE

#define MAX_CODE   ((1ULL << CODE_BITS) - 1)

MAX_ENCODE_BITS

#define MAX_ENCODE_BITS   (BUFFER_SIZE * 8)

MAX_PENDING

#define MAX_PENDING   1024

NUM_SYMBOLS

#define NUM_SYMBOLS   38

QUARTER

#define QUARTER   (HALF >> 1)

THREE_QUARTERS

#define THREE_QUARTERS   (HALF + QUARTER)

Function Documentation

arithmetic_decode()

int arithmetic_decode	(	uint8_t *	input,
		int	max_len,
		char *	output,
		int	max_output
	)

arithmetic_encode()

int arithmetic_encode	(	const char *	msg,
		uint8_t *	output
	)

br_init()

void br_init	(	BitReader *	br,
		uint8_t *	buf,
		int	len
	)

br_read_bit()

int br_read_bit

(

BitReader *

br

)

bw_bytes()

int bw_bytes

(

BitWriter *

bw

)

bw_init()

void bw_init	(	BitWriter *	bw,
		uint8_t *	buf
	)

bw_write_bit()

void bw_write_bit	(	BitWriter *	bw,
		int	bit
	)

find_index()

int find_index

(

char

c

)

init_model()

void init_model

(

void

)

Variable Documentation

cum_freq

uint64_t cum_freq[NUM_SYMBOLS+1]

symbols

char symbols[NUM_SYMBOLS]

Initial value:

= {
    'A','B','C','D','E','F','G','H','I','J','K','L','M',
    'N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
    '0','1','2','3','4','5','6','7','8','9','-',
    '\0'  
}