ENCODE(2)ENCODE(2)delim $$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. They require $2 n + 1$, ${ 8 n + 4 } over 5 + 1$ and $4 { {
n + 2 } over 3 } + 1$ bytes, respectively.
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(2) and print(2) 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
/sys/src/libc/port/u[136][246].c
ENCODE(2)
