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/*
** Copyright 1998 - 2008 Double Precision, Inc.
** See COPYING for distribution information.
*/
#include <stdlib.h>
static const char decode64tab[256]= {
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 62, 100, 100, 100, 63,
52, 53, 54, 55, 56, 57, 58, 59,
60, 61, 100, 100, 100, 100, 100, 100,
100, 0, 1, 2, 3, 4, 5, 6,
7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22,
23, 24, 25, 100, 100, 100, 100, 100,
100, 26, 27, 28, 29, 30, 31, 32,
33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100,
100, 100, 100, 100, 100, 100, 100, 100};
int authsasl_frombase64(char *base64buf)
{
int i, j, k;
for (j=0; base64buf[j]; j++)
if (decode64tab[(unsigned char)base64buf[j]] >= 100)
break;
if (base64buf[j] && base64buf[j+1] && base64buf[j+2])
return (-1);
while (base64buf[j] == '=') ++j;
if (j % 4) return (-1);
i=j;
k=0;
for (j=0; j<i; j += 4)
{
int w=decode64tab[(int)(unsigned char)base64buf[j]];
int x=decode64tab[(int)(unsigned char)base64buf[j+1]];
int y=decode64tab[(int)(unsigned char)base64buf[j+2]];
int z=decode64tab[(int)(unsigned char)base64buf[j+3]];
int a,b,c;
a= (w << 2) | (x >> 4);
b= (x << 4) | (y >> 2);
c= (y << 6) | z;
base64buf[k++]=a;
if ( base64buf[j+2] != '=')
base64buf[k++]=b;
if ( base64buf[j+3] != '=')
base64buf[k++]=c;
}
return (k);
}
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