ENCODE(3)

NAME
dec64, enc64, dec32, enc32, dec16, enc16, encodefmt - encoding byte arrays as strings

SYNOPSIS
#include <u.h>
#include <libc.h>

int    dec64(uchar *out, int lim, char *in, int n)

int    enc64(char *out, int lim, uchar *in, int n)

int    dec32(uchar *out, int lim, char *in, int n)

int    enc32(char *out, int lim, uchar *in, int n)

int    dec16(uchar *out, int lim, char *in, int n)

int    enc16(char *out, int lim, uchar *in, int n)

int    encodefmt(Fmt*)

DESCRIPTION

Enc16, enc32 and enc64 create null terminated strings. They return the size of the encoded string (without the null) or -1 if the encoding fails. The encoding fails if lim, the length of the output buffer, is too small.

Dec16, dec32 and dec64 return the number of bytes decoded or -1 if the decoding fails. The decoding fails if the output buffer is not large enough or, for base 32, if the input buffer length is not a multiple of 8.

Encodefmt can be used with fmtinstall(3) and print(3) to print encoded representations of byte arrays. The verbs are

H   base 16 (i.e. hexadecimal). The default encoding is in upper case. The l flag forces lower case.

<   base 32

[   base 64 (same as MIME)

The length of the array is specified as f2. For example, to display a 15 byte array as hex:
        char x[15];
        fmtinstall('H', encodefmt);
        print("%.*H\n", sizeof x, x);

SOURCE
/usr/local/plan9/src/lib9/u32.c
/usr/local/plan9/src/lib9/u64.c