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static char *base64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static struct {
int r_shift;
int l_shift;
int mask;
} rlm[3]={{2,4,0x30}, {4,2,0x3c}, {6,0,0x3f}};
void mime_encode( unsigned char *sptr, unsigned char *dptr, int pslen )
{ int mod3;
unsigned char c;
for( *dptr = c = mod3 = 0; pslen; pslen-- ){
*dptr++ = base64[ c + ((*sptr) >> rlm[mod3].r_shift) ];
c = (( *sptr++ ) << rlm[mod3].l_shift ) & rlm[ mod3 ].mask;
if( mod3 == 2 ) {
*dptr++ = base64[ c ];
c = 0;
mod3 = 0;
} else {
mod3++;
}
}
if( mod3 ){
*dptr++ = base64[ c ];
}
*dptr = 0;
}
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