gf_tabutil.h File Reference

utility functions to access GF Tables More...

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Functions
int FACTORY_PUBLIC	gf_tab_numdigits62 (int q)
char	conv62 (int i)
void	convert62 (int i, int n, char *p)
int	convback62 (char c)
int FACTORY_PUBLIC	convertback62 (char *p, int n)

Detailed Description

utility functions to access GF Tables

Definition in file gf_tabutil.h.

Function Documentation

conv62()

char conv62

(

int

i

)

Definition at line 22 of file gf_tabutil.cc.

{
    if ( i < 10 )
        return '0' + char(i);
    else  if ( i < 36 )
        return 'A' + char(i-10);
    else
        return 'a' + char(i-36);
}

convback62()

int convback62

(

char

c

)

Definition at line 40 of file gf_tabutil.cc.

{
    if ( c >= '0' && c <= '9' )
        return int(c) - int('0');
    else  if ( c >= 'A' && c <= 'Z' )
        return int(c) - int('A') + 10;
    else
        return int(c) - int('a') + 36;
}

convert62()

void convert62	(	int	i,
		int	n,
		char *	p
	)

Definition at line 32 of file gf_tabutil.cc.

{
    for ( int j = n-1; j >= 0; j-- ) {
        p[j] = conv62( i % 62 );
        i /= 62;
    }
}

convertback62()

int FACTORY_PUBLIC convertback62	(	char *	p,
		int	n
	)

Definition at line 50 of file gf_tabutil.cc.

{
    int r = 0;
    for ( int j = 0; j < n; j++ )
        r = r * 62 + convback62( p[j] );
    return r;
}

gf_tab_numdigits62()

int FACTORY_PUBLIC gf_tab_numdigits62

(

int

q

)

Definition at line 12 of file gf_tabutil.cc.

{
    if ( q < 62 )
        return 1;
    else  if ( q < 62*62 )
        return 2;
    else
        return 3;
}