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/*
FILE NAME: bits.h
TITLE: Include file of package for work with bits
DESCRIPTION:
This is header file contains macros and the ANSI C prototype
definitions for the package for work with bits and bit strings
and C++ class for work with bits and bit strings. A bit is
given by address (start address) of byte from which counting
bits starts and its displacement which is any non negative
number of bit from the start address. The most significant bit
of the start address byte has number 0. The bit string is
given by its first bit and its length in bits.
*/
#ifndef __BITS__
#define __BITS__
#include "ammunition_limits.h"
/* This macro value returns bit vlaue (0 or 1) with given bit
displacement (0, 1, ...). The macro has side effects! Value of
`bit_displacement' must be nonegative and can be greater than
CHAR_BIT. */
#define BIT(start_byte, bit_displacement)\
((((const char *) (start_byte)) [(bit_displacement) / CHAR_BIT]\
>> (CHAR_BIT - 1 - (bit_displacement) % CHAR_BIT)) & 1)
/* This macro value sets up new value (must be `0' or `1') of a given
bit (bit displacement starts with 0). The macro has side effects!
Value of `bit_displacement' must be nonegative and can be greater
than CHAR_BIT. */
#define SET_BIT(start_byte, bit_displacement, bit)\
(((char *) (start_byte)) [(bit_displacement) / CHAR_BIT]\
= (((char *) (start_byte)) [(bit_displacement) / CHAR_BIT]\
& ~(1 << (CHAR_BIT - 1 - (bit_displacement) % CHAR_BIT)))\
| ((bit) << (CHAR_BIT - 1 - (bit_displacement) % CHAR_BIT)))
int ammunition_is_zero_bit_string ( const void *start_byte,
int bit_displacement,
int bit_length );
void ammunition_bit_string_set ( void *start_byte, int bit_displacement,
int bit,
int bit_length );
void ammunition_bit_string_copy ( void *to, int to_bit_displacement,
const void *from, int from_bit_displacement,
int bit_length );
void ammunition_bit_string_move ( void *to, int to_bit_displacement,
const void *from, int from_bit_displacement,
int bit_length );
int ammunition_bit_string_comparison ( const void *str1, int bit_displacement1,
const void *str2, int bit_displacement2,
int bit_length );
#endif /* #ifndef __BITS__ */
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