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/*
* bit-io.h
*
* Written by: Ullrich Hafner
*
* This file is part of FIASCO («F»ractal «I»mage «A»nd «S»equence «CO»dec)
* Copyright (C) 1994-2000 Ullrich Hafner <hafner@bigfoot.de>
*/
/*
* $Date: 2000/06/14 20:49:37 $
* $Author: hafner $
* $Revision: 5.1 $
* $State: Exp $
*/
#ifndef _BIT_IO_H
#define _BIT_IO_H
#include <stdio.h>
#include "types.h"
#define OUTPUT_BYTE_ALIGN(bfile) while ((bfile)->bitpos) put_bit (bfile, 0);
#define INPUT_BYTE_ALIGN(bfile) while ((bfile)->bitpos) get_bit (bfile);
typedef enum {READ_ACCESS, WRITE_ACCESS} openmode_e;
typedef struct bitfile
{
FILE *file; /* associated filepointer */
char *filename; /* corresponding filename */
byte_t *buffer; /* stream buffer */
byte_t *ptr; /* pointer to current buffer pos */
unsigned bytepos; /* current I/O byte */
unsigned bitpos; /* current I/O bit */
unsigned bits_processed; /* number of bits already processed */
openmode_e mode; /* access mode */
} bitfile_t;
FILE *
open_file (const char *filename, const char *env_var, openmode_e mode);
bitfile_t *
open_bitfile (const char *filename, const char *env_var, openmode_e mode);
void
put_bit (bitfile_t *bitfile, unsigned value);
void
put_bits (bitfile_t *bitfile, unsigned value, unsigned bits);
bool_t
get_bit (bitfile_t *bitfile);
unsigned
get_bits (bitfile_t *bitfile, unsigned bits);
void
close_bitfile (bitfile_t *bitfile);
unsigned
bits_processed (const bitfile_t *bitfile);
#endif /* not _BIT_IO_H */
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