implement Encoding; include "encoding.m"; b32: con "23456789abcdefghijkmnpqrstuvwxyz"; enc(a: array of byte): string{	if(len a == 0)		return "========";	out := "";	nbit := len a * 8;	for(bit := 0; bit < nbit; bit += 5){		b := bit >> 3;		r := bit & 7;		v := int a[b] << r;		if(r > 3){			if(b+1 < len a)				v |= int (a[b+1] >> (8-r));		}		out[len out] = b32[(v>>3) & 16r1F];	}	# RFC3548 says pad with =; this follows alternative tradition (a)	return out;} INVAL: con 255; t32d := array[256] of {	'2' => byte 0, '3' => byte 1, '4' => byte 2, '5' => byte 3, '6' => byte 4, '7' => byte 5, '8' => byte 6, '9' => byte 7,	'a' => byte 8, 'b' => byte 9, 'c' => byte 10, 'd' => byte 11, 'e' => byte 12, 'f' => byte 13, 'g' => byte 14, 'h' => byte 15,	'i' => byte 16, 'j' => byte 17, 'k' => byte 18, 'm' => byte 19, 'n' => byte 20, 'p' => byte 21, 'q' => byte 22, 'r' => byte 23,	's' => byte 24, 't' => byte 25, 'u' => byte 26, 'v' => byte 27, 'w' => byte 28, 'x' => byte 29, 'y' => byte 30, 'z' => byte 31,	'A' => byte 8, 'B' => byte 9, 'C' => byte 10, 'D' => byte 11, 'E' => byte 12, 'F' => byte 13, 'G' => byte 14, 'H' => byte 15,	'I' => byte 16, 'J' => byte 17, 'K' => byte 18, 'M' => byte 19, 'N' => byte 20, 'P' => byte 21, 'Q' => byte 22, 'R' => byte 23,	'S' => byte 24, 'T' => byte 25, 'U' => byte 26, 'V' => byte 27, 'W' => byte 28, 'X' => byte 29, 'Y' => byte 30, 'Z' => byte 31,	* => byte INVAL}; dec(s: string): array of byte{	a := array[(8*len s + 4)/5] of byte;	o := 0;	v := 0;	j := 0;	for(i := 0; i < len s; i++){		if((c := s[i]) > 16rFF || (c = int t32d[c]) == INVAL)			continue;		v <<= 5;		v |= c;		if((j += 5) >= 8){			a[o++] = byte (v>>(j-8));			j -= 8;		}	}	return a[0:o];}